ROCHESTER GAS @HO ELECTRIC COi?PORATIC'I

'xs 8r ~AS i APERCU „,.OC4co(~x, M.F. t>049

LEON O. iVHITK.JR„VLCC epCSIOCNT

July 21, 1980

Director of Nuclear Reactor RegulationAttention: Mr. Dennis M. Crutchfield', Chief

Operating Reactors Branch N5Division of Operating Reactors

U.S. Nuclear Regulatory CommissionWashington, D.C. 20555

Subject: SEP Topic VIII — 4 Electrical Penetration of ReactorContainmentR.E. Ginna Nuclear Power PlantDocket No. 50-244

Dear Mr. Czutchfield:

This letter will serve as Rochester Gas and Electric'sresponse to the assessment of SEP Topic VIII-4 issued by letterdated March 24, 1980 from Mr. Dennis L. Ziemann. Specific commentsare enclosed for your review.

We have reviewed the concerns set forth in the-SEP-=TechnicalEvaluation and believe that clarification of certain designfeatures of the Crouse Hinds electrical penetrations will resolvethem. The following information is provided to supplement ourApril 12, 1979 submittal and to permit revision of the StaffTechnical Evaluation.

Silver brazing is used in the two largest categories ofpower penetrations while soft. solder is used on allothers. However, the NRC Staff assumed a soft solderseal for all penetrations. This greatly understatesthe thermal capabilities of penetrations using the hightemperature braze. The melting temperature for thesilver brazing is 1100'F or 600'C.

Formula 1 obtained from the RG&E's submission (IPCEA-P-32-382) was developed to allow the user to determinethe maximum time a cable may be subjected to a shortcircuit load without damage to the insulation. The Qp$formula is based on the heat content of the conductormaterial and the temperature limits of the insulation 'li>"with the assumption that the time interval is so shortthat the heat developed during a short. circuit is con-tained in the conductor.

eaa8~

THIS DOCUMENT CONTAINS

POOR QUALITY PAGES

s

'/

~lk

II

'y'

ROCHESTER GAS AHD ELECTRIC CORP.

DATE July 21, 1980Mr. 'Dennis M. Crutchf ield

SHEET NO.

Consequently, this expression should not be used todetermine the time it takes to reach the maximum shortcircuit temperature of the bushings used in Ginnapenetrations since it does not take into account anyheat dissipated. The "heat sinking" will greatlyincrease the time to melt a seal for a given shortcircuit current. A more realistic approach is to usethe actual test data for each penetration to2make sucha determination. Specifically, the tested I t valuescan be adjusted to account for a 140'C ambient temperatureusing the relationship shown as Formula 1.

The I t value for the N2 AWG size penetqations, using2

the C-H test data shown below is 7 x 10

TEST DATA: 37. 4 KA total RMS ( 64. 8 Maximum Peak Current) for3.0 cycles.

180 + 234140 +

234'0297

A

.0297 A log 180'234'5o

+ 234oI t ( 25'C)

To adjust this value to a 140'C ambient a factor derivedfrom formula 1 can be developed as follows for the softsolder seals:

0 0

I t (140o)

I t (25 )

Thus the I t for thy 52 type penetration at 25'C can be2

reduced from 7 x 10 to 1. 4 x 10 to include a 140'Cambient. The resulting allowable time2is determined tobe .15 seconds at 9.6 KA. Using the I t values forthis specific penetration yields a more realisticresult. The backup clearing time for the AE-6 penetrationof .1 seconds is sufficient to comply with the staff'scriteria.

2.

Therefore, all penetrations are acceptable: the twolargest power penetrations because they employ silverbrazing and not soft solder and all other penetrationsas analyzed above.

There are two large penetrations used to feed thereactor coolant pumps. The Technical Evaluation postu-lates that one of the two feeds opens, without a fault,causing the remaining feed to overheat when subjectedto full load current. The calculated time to failurewas 6.5 minutes.

ROCHESTER OPS AiVO ELECTRIC CORP.July 21, 1980Mr. Dennis M. Crutchfield

SHEET NO.

3.

This conclusion is based on a soft solder seal andcontinuous current ratings of the cable. Zn actuality,this penetration has a silver braze seal and has acontinuous current rating of 1000 amperes. The 450ampere rating in the RGGE report reflects the rating ofthe 750 mcm cable. Should the postulated conditionoccur, remote as it might be, no seal failure wouldresult. There would, however, be a degradation of thecable insulation and a breaker trip would result toclear the problem once the insulation failed.The staff's evaluation of the CE-21 penetration indicatedthat no data was submitted on mechanical stresses ofthe tested values. The C-H testing program demonstratedboth the ability'o withstand short circuit currentsand the mechanical stresses associated with the highasymetrical test currents. The test reports ( seeenclosures) indicated that certain penetrations requiredadditional bracing in order to pass. The requiredbracing was installed.

4 ~

5.

The direct current penetration, CE-23, does not complywith the staff's criteria in that the backup device, atall fault current levels, does not respond fast enoughto prevent a seal failure. Both the primary and secondaryprotective devices are fuses. The most likely failuremode is for the fuse to fail open. However, all dccontrol circuits in all penetrations will be reviewedand additional fuse protection will be installed.A concern has been identified in the'evaluation reportwhich deals with low magnitude faults. While somebackup devices respond to high level faults they do notclear in sufficient time on low magnitude faults. Lowvoltage penetrations, CE-21,AE6 and the medium voltagepenetrations CE-25 and 27 are currently being reviewedto improve the backup breaker characteristics.

When the reviews described above are complete the Ginnaelectrical penetrations will meet current licensing criteria foroperating plants. That is, the as-built penetrations were designedso that the containment structure can, without exceeding thedesign leakage rate, accommodate the calculated pressure andtemperature resulting from any loss of coolant accident.

ROCHES R GAS AHO EL CTRIC CORP.July 21, 1980Mr. Dennis M. Crutchfield

SHEE7 NO.

4

Enclosed please find responses to the additional questionsraised by a member of the NRC Staff concerning this SEP Topic.

Very truly yours,

Response to NRC's

Request for Additional Information

Ref: SEP TOPIC VIII-4, ELECTRICAL PENETRATIONS

Question: 1. Please provide responses to the following:

Response:

a) Quantify the softening point of the silver brazing usedin your larger penetrations and identify the basis forthis point.

The softening point of the silver brazing used in the500 mcm and 750 mcm, Configuration Sketch "E" typepenetrations is assumed to be the lowest temperaturelisted for silver braze as shown in attachment 1. Thelowest ASME classification of brazing filter metalsrange from 1145-1400'F. For conservatism 1100'F or600'C is used.

Question: b) Clarify the discrepancy between your citation of silverbrazing in the subject letter and the statement made byyour Mr. George Link to Mr. A. C. Udy of EG&G Idaho tothe effect that your analyses were all based on solderedseals.

Response: It should be noted that the term "silver solder" isoften used to describe the material which shouldproperly be referred to as "silver braze" in accordancewith the ASME definition, so that some misunderstandingmay have developed.

C-H has recently located additional drawings whichdetailed the high temperature braze seal and whichestablishes the 1000 ampere rating on the bushing.These drawings enclosed as attachment 2.

Question:

Response:

c) Clarify the discrepancy between the statement in yourletter that silver brazing is used in the largest powerpenetrations and the statement in your April 12, 1979report that, "Details of each penetration can be seenon the Crouse-Hinds drawings ....". (Crouse-HindsDrawing 0100350 Sheet 2 of 3 states that the 750 mcmpenetration has a glass/metal feedthrough.)

The glass/metal feedthrough detail shown on C-H drawing0100350 sheet 2 of 3 applies to configurations A,B,C,Dand F only and not to Type E, the 750 mcm penetration.The C-H drawings of the power penetrations show thesilver braze used to seal the conductors fed throughthe bushings.

Question: 2. Please provide responses to the following:

a) Clarify the discrepancy between your reference to testdata and Paragraph 2.52of your April 12, 1979 reportthat states that the I t values were calculated.

Response:

Question:

Question:

Response:

The "manufacturer's calculations" referred to inparagraph 2.5 are based on test data for penetrationtypes A and E. All others were based on analysis.

b) If the I t values were calculated, provide the mathe-2

matical models of the containment and penetration heattransfer that were used in the calculations. If actualtests were run, provide a description of the testset-up, procedures, and results.

c) Justify the use of a single test point to determine theshape, slope, and intercept of a line.

The ambient temperature condition during short circuittesting was assumed to be 25'C. )he data (current andtime) were used to establish an I t function which wasthen adjusted using formula 1. The model assumes thatall heat developed during the short circuit is containedwithin the conductor so that penetration geometry andheat transfer characteristics are not used. It shouldbe noted that IPCEA P-32-382 is based on this conservative

=-model. Since the IPCEA standard does not contain anexplicit derivation of the I t relation, we haveincluded one in the attachments. Since no heat isassumed to be transferred out of the conductor, theadjustment of I t values for different ambient tempera-tures is accomplished by changing the initial temperaturein the IPCEA formula as described in our letter.Certified Test Reports are included as attachment 5.

Question

Response:

3. Justify using the 450 amp cable rating for the 750 mcmpenetration in your April 12, 1979 report and provide thebasis for the 1000 amp rating you now wish to use.

C-H has recently located design information on theAlite bushing used on the 750 mcm penetration. Thesedata are enclosed as attachment 3 which show that thebushing and seal integrity are rated for 1000 ANPS.

ATTACHMENTSTO

RE UEST FOR ADDITIONAL INFORMATION

Ref: SEP Topic VIII-4, Electrical Penetrations

2.

3.

5.

ASME Table QB-432 Grouping of Brazing Filler Metals

Crouse-Hinds Drawings0100332 - High Amperage Insulator

For 75 mcm; 5 Kv0100292 — S/A of Insulator and Cable

Seal for 750 mcm cable

Data. Sheet — Alite High Amperage Bushings

Derivation of the IPCEA, ( I) t formula(A)

Crouse-Hinds Test Reports:

a) Certified Test Report on Electrical Penetration-3 Conductor M-573-1968

b) Short Circuit Test on 52 AWG. low voltage limit

'I h

DATA—

QB-130 F-NUMBERS

QB f31 Get)eral

All p;t «s in this Article are identified by thenumber I-1-3. followed by the specific page identi-l'ying nulnbcr, which is indicated at the bottom ofe<lcli pag<c.

Tlte I')lfowing F-Number grouping of brazing fillermetals in QB-432 is based essentially on theirusability «hara«teristics, which fundamentally deter-

F-NUMBERS QB-430-QB-432

mine the ability of brazers and brazing operators tomake satisfactory brazements with a 'given fillermetal. This grouping is made to reduce the numberof brazing procedure and performance qualificationswhere this can logically be done. The grouping doesnot imply that filler metals within a group may beindiscriminately substituted for a filler metal whichwas used in the qualification test without consider-ation of the cotnpatibility from the standpoint ofmetallurgical properties, design, mechanical proper-ties, and service requirements.

~) c Itg ~ g l~'J t",QB432

F-NUMBERSGrouping of Brazittg Filler Metals for Procedure and Performance Qualification

SFA-5.8

Recorrrinended JointClearance at

Brazing Temperatures, in.

F- AS MEQB No. Classification Nominal Composition, %

Ag Cu Zn Cd Ni Li Other

Brazing Range

Temp,F

WithChemical

Fluxes

WithAtmosphere

Brazing*

432.1 F- i0 t BAg-1BAg.laUAg.8UAg ea

45 1550 15572 2872 27.8

16 24165 18

~ ~ ~

0.2

114 5-14001175-1400143j-16501410-1600

0.001%.0030.001%.0030.001&.0030.001&.003

0.000%.0020<000%.0020.000%.0020.000&.002

432.2 F- t02 BAg-2BAg-2aBAg-3BAg.4UAg.5BAg 6BA-7BG-13BG 13aUG-18

35305040455056545660

262715.530303422504230

21 1823 2015.5 16 328 ... 2

251617

5 1

~ 2

5Sn

10 Sn

0.025 P

1295-15501310-1 5501270-15001435-16501370-15501425-16001205-14001575-17751600-18001325-1550

0.002&.0050.002%.0050.002&.0050.002&.0050.002%.0050.002-0.0050.002&.0050.002%.0050.002-0.0050.002%.005

0,000%.0020.000-0.0020.000-0.0020.000-0.0020.000-0.0020.000&.0020.000%.0020.000-0.0020.000%.0020.000-0.002

BG.19 92.5 7.3 0.2 1610-1800 0.002-0.005 0.000-0.002

432.3 F-io'CuP-1BCuP.28CuP.3BCuP.4UCuP.5

Cu

Rem.

Rem.Rem.Rem.Rem.

Ag:-. P

5

7.35 66

15 5

1450-17001350-15501300-15001300-14501300-1500

0.001-0.0050.001-0.0050.001-0.0050.001&.0050.001-0.005

<VOTES:t 1) Fur nrax «iu;ri strength use a press fit at room temperature, of 0.001 fir.lfn. of diameter.i2') At r<o"„uvre Lrazirrg includes brazing in vacuum, in addition to such gaseous atmospheres as hydrogen, argon, dissociated ammonia, etc.

Attachment 1 (Q8-432 continues on nexr page)

N 1

f

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~ I

C'

t

/>t> y Qs Q>J„», r'.»t>-> . '"»~o

DILVEHHK IIZENQ fg QQV5 STOCK NUMBER

1ifICOhigh purity silver brazing alloys

"{COSIL35"

rnlloy has a wide range between melting and flow points.,-is more sluggishly and ls used where fit-up is poor and"Intge fillets are desired.

"ICOS IL45~ be used for such similar applications as AIRCOSIL 50.:!~y has a lower melting point than AIRCOSILSO.

i"tCOSIL 50:i; ncral purpose alloy suitable (or brazing assemblies of

". iiioy, tool and stainless steels, copper, nickel and-vfnr combinations of these metals.

WireSize

1/32"3/64"1/16"3/32"1/8"

1/32"3/64"1/16"3/32"1/8"

1/32"3/64"1/16"3/32"1/8"

RandomCoils

925 350'I925.3500925-3502925.3503925.3504

925 4501925 4500925 4502925 4503925»4504

925 5001925.5000925.5002925 5003925 5004

4 oz.Package

925-3541925.3540925.3542925-3543925-3544

925 45419254540925»4542925 4543925 4544

925 5041925.5040925-5042925 5043925.5044

50 oz.Package

925-3551925 3550925 3552925 3553925 3554

9254551925.4550,925.45529254553925-4554

925.5051925 5050925-5052925 5053925-5054

i>'ITIFICATION OF AIRCOSIL SILVER BRAZING ALLOYS

AWS.ASTM Solidus ~

alACO Alloys Class Silver Copper Zinc Cadmium Others a FLiquidus

oF

BrazingTemp.

Range aF

~ ~,

~ 1

> ~

tilCOSIL 50uflCOSIL 3'iflCOSIL 45

flCOSIL 35'u{COSIL 30uilCOSIL S-"ilCOSIL 15uflCOSIL

A'u{ICOSIL8'tflCOSIL

C'.flCOSiL0"'ICOS IL E

"ltCOSII. F

:ICOSIL G'ICOSIL

H';lCOSILJ""{:OSILK'lCOSIL LzulCOSIL M"flCOStl.

P':l{:OSILR

:.cosit. So'n Alloys m

'!ERS{yIITHSOLOERS

BAg-1 a 50 15.5 16.5BAg 3 50 15.5 15.5BAg-1 45 15 16BAg 2 35 26 21

BAg 2a 30 27 23BCuP 3 5 88.75BCuP 5 15 80

9 53 3820 45 3520 45 3030 38 32

BAg 4 40 30 2840 36 24

BAg 5 45 30 25BAg 6 50 34 168Ag.7 56 22 17

60 25 15BAg 13 54 40 5BAg 8 72 28

8540 30 25

B>>g >8 60 3t>ade on special order only.

18'6

241820

Ni3

P 6.25PS

Ni 2

Sn5

Ni 1

Mn 15Ni 5Sn 10

'160117011251125112511901185141013151140137012401235125012701145124513251435176012401115

11751270114512951310148015001565150015001410'l 4351415137014251205132515751435177815601325

I 1 75.14001270.15001145 14001295.15501310.15501300 15501300 15001600 17501500*170015OO 17001410 16501435 16501445.16501370-15501425.16001205.14001325.15501575 17751435.16501 780.21001560 17501325.1550

>l ~

"'COSII Easy"'{COSILMedium'{COSILHard

65 2070 2075 22

15103

124012751365

132513601450

1325 15501390.16001450 1650

nSPHORUS AND PHOS SILVER ALLOYS

>I>~

I!i()

153154

"- n Copper.Rod'"nt Copper Strip' Silver 6r"n<.Silver 6>VI

~ni Silver 2

BCuP.28 CUP-18CuP.48CuP-3

9395

6 8756 882 91

P 7 1305P 5 1305P 7.25 1185P 6 1190P 7 1190

14851650138014801450

1350 15501450.17001300 15001300 15501350.1500

5.3

t I

Attachrrent 3

M ZiieH Zsws s~~es susHiWGSAlite high current, hermetically sealed bushings arequickly and easily brazed or ivelded into final as-semblies to form strong, trouble-free, gasketlessbonds capable of ivithstanding very high temper-atures. Their mechanical strength characteristicsand thermal shock properties far exceed those ofglass or porcelain. Impact- and corrosion-resistant,Alite high amperage bushings retain their superiordielectric properties at elevated temperatures. Theirlustrous smooth, hard, easy-to-clean glaze assureshiLh surface resistivity.

13/I6'-II/I6'LAZED

2.000'e

Metal Parts: Kovar

'r'.a~4PVg

'Res. T.M„Westlngtsause Electric Corporation

PartNa.

HC-100HC-125HC-150HC-175HC-225

2.7503.2503.5004.0004.500

1

1 I/e

1 I/s

1 s/4

2 I/e

.9061.1561.4061.7192.156

lee1%22IA

3

CurrentCarryingCapacity(Asnps)

5001000150020003000

Jj~ha r, M~m- sr nr w r~8,. 'E ~/~'oi~wE ' !csa'ster, 4a~eine. s~ hJ~'rs=: ~ "r''r c . " ',~'~~~'~'~"-'0'eYj'e" >M% /8/ lee'~v "i~ ~~~ofrc

~"

Special purpose units shown: 1. Hermetic transformer housing.2. High current hushing designed for heavy center conductor.

3. and 4. Special high voltage custom designs.

lws

*'

it ~

C'

~ ~ac ~el' U aliia n c li ALI]TE iia t vn i ~ alla

HIGH TENPERATURE HERNETIC

BONDING PROCFSS

Our method of high temperature metal-lizing and brazing provides a ceramic-to;,metal seal that is strong, permanent andvacuum-tight. In this process, a specialrefractory metallizing compound is appliedto the ceramic over areas where metalcomponents are to be bonded. Subsequenthigh temperature firing in a controlled at-mosphere produces a smooth integrally-bonded metallic surface to which the met-al parts are then brazed with fine silver orother high temperature braze metals. Dueto the inherent high temperature stabilityof the ceramic and the bond, operatingtemperatures of Alite terminals are re-stricted only by the tern'perature and oxi-dation limits of the braze material andmetal parts.

NETAL PAR7Sbletal flanges and terminal caps areformed of low expansion type nickel-iron

ivith fused-on silver plating. On specialorder other types of plating or other metalssuch as nicl'el. iXIonel. copper, or stainlesssteel can be supplied to meet,diEerent cn-vironrnental conditions. Terminal studsmade of nickel plated low carbon steel orunplated type "R- i~'lonel are included asstandard equipment. Studs made of othermaterials in various finishes, lengths andthread sizes are available on special order.Terminals can also be supplied withoutstuds. or with center conductors.

FINAL ASSEA1BLY AlETHODSThe sturdy construction of Alite terminalspermits a wide range of installation tech-niques. For service at extreme high tem-

peratures they are usually brazed to mainassemblies by torch, induction or furnacebrazing. WVelding the terminals to equip-ment is also possible by resistance or inertarc welding techniques. Low temperaturesoft soldering is a suitable method of

Attachment 4

DZEXVATTQN of the IPCEA, I t Formula.A

Assume all ohmic heat is retained within the conductor during theshort circuit. (i.e. adiabatic heating)

Q =R =L =A

~(T) =Cp =To

heating rateconductor resistanceconductor lengthconductor cross sectional areaconductor resistivityconductor specific heat capacityEffective absolute zero for conductormaterial (Celcious scale)

Conductor heating rate per unit length,

Q/L = I RL

R = ~L(~TA

Q/L = I ~TA

Rate of change of temperature.

dT I ~TA Cp

~(T) = r(Tc — To)

~ ~ dTdt

let Tc - To = I

I 2

A—(Tc — To}rCp

i()'l

0

dtrCp

I <t ~C l Tcl - To

\

Attachment 5

CERTl Fl ED TEST REPOPT

'NELECTR1CAL PENETRAT1ON - g CONDUCTORS

REPORT

~1-575

~ ~

r4

~ 6

CROUSr - H1NDS CO,'.\P ANY'

BY

KEARNEY. CO/.'IPANY

LECTRl CAL RESeARCH LABMATORY

DcCOO'ij', 1LLlNOl S

1 9o8

~ e

Al"575Page I

Kearney Company

Electrical Research Laboratory

NcCook, I I I inoisI, Sample Description

2D

Efectrlcaf penetration - $ conductor, consisting of stainless- .steel canister, 8" pipe, 5 feet long, viith 2 headers v)1th gceramic insulators in each, Three conductors vtere trainedand braced internally v~1th fiber discs.

'. Conductors under test 750fhC'('nusedconductor 500 tACN

I'I

Sample identif iod as a mock-uo unit with Ion voltago ceramics9Cat. No. 010025l, order No. F«S'IL(77-CD

Ob 'ecf of Test

Inves t i gate short-c ircui t current cap ah i I

Test Program, conducted on August 28, f968.

A, Shot /,'I, (f8,700:A asym. RNS for 82. c(For current calibration se.Sym. RfAS )After the shot~ tes t s amp f eleads- of-the bridge circuit

A

It les of tho des igno

yc l es, osc. 1/7e osc. f/6-60,000 A

'es

istance, includingwas measured at 27 mM.

,BD

5 KV DC voltage vras appf ied to measure leakagecurrent - negligible (pA range)'o

No gas leak detected at 65 psi by "SNOOP"No visible damage to ceranics or bracing discs,

Shot b2o,6$ ,000 A asym..RIES fo; 7 cyc l es, osc. (88(Use calibration osc. 1/6).After rhe snot, resistance and leakage currentnere about the same.

Higher gas ! eak detected on..unviedged .ceramicso~ No f eak on vjedged ceramics.

No visiblo damage to ccrqmIcs or bracing discso

(Cont I nuod P ag e 2, )

/~ ~

' I

e

~ v ~ ~

I

~~"575Page 2i

C. ~Shot t","

9 ~ ~Shot r~r'

Eo Shot -,rgb

F, . Shot. ~6o

G,,~Sho t

L~., Test Circuit

Kearney Company

I'tcCook, Illinois(Continued -')This was a one-half cycle fesi shof fo merelyreduce possibility of an inrush current to fhotest transformertoccurrlng on the HV side ortes t l'ransformer during lhe „folloviing tosioS see o c l10.

7l,)F00 A asym. R/PS for 9 cycles, osc. Iltl. (For currenf calibration see osc ly9-

-80,000 A sym. R|t'.S)After the shot, resistance and leakage currontwere ab'out the same,

'No additional gas leakoNo vis lb le damage to coramics or bra'c ing discs.No test: see explana; ion unde." shot ji-'$ See oscollt2.t

. 79~200 A asym, 'R/hS for fOy cyc l os, osc, iLg{Use caf ibration osc. ij9).

~ After ihe shot, resistance and leakage currentwere abou ihe same>No g as l eak.No visible damage to ceramics or bracing discs,'

80, lQO .A asym. RBS for lO cycles, osc, JQ.,(Uso calibration osc, lg9).After the shot, resistance and leakage. currentvjere about i he same,No gas feakoNo vis lb le danago to b. ac ing discs„

The rest sampl o was. energized through a l2,000 KYA 9KY specialmonenf ary trans former, connoc ted for y60V on the .secondary{tes',) side.Cl osing in for maximum asynnetry was accompl ished by spark ingover an air gap v(ith a l2~~KV surge generator synchronized tof ire at Oo of the 60-H supp l y vol tage.Des irab i o short durat ion t iming was approximarod by us ing anappropr iate back-up protect ion fuse cuf'out,

Currentsa currentKVA es,in cycles

through fhe t, sf specimen viere measured by means off rans rormer on f he high»vo l tag e s i de of the

l2,000'ransform"r.Durat ions or'urront fl ov~ vJero countedfrom aciual oscil lograms,.

t

.(Continuod P'ago'go)t

1

'1t

t~4

~ ~~ ~

>'575'ago

~,

Kearney Co.".,pany

h'cCook, t f l inois

-(Continued - )) )

Al f measured'ts ivere made in accordance v(ith the appf lcab lestandard speci fications. Common sound engineer ing practicesvIero fof lovred in measurements nor specifical ly standardized.

Asymmetr ical Rh(S currenis v.ere determined in accordance nf thfhe apoendix of, AiEE Standard for Air SvIitches, lnsul atorUni is and Bus Supports", Pub f. No 22, dated lharcn, f960;see curve h( of Fig. 5.

Cert i f icat ion)

Stai ements made and dafa shovin in'his report.h<«5g, con-s ist ing of $ pages, are to the best or'y knowledge and bof Icorrect vI f thin, i he usual f imi ts or commerc l af tes t ing pract i

Tost v,'as vlf tnessod by '.(r. Jim Kef fy, Eng incer, Nuclear~ Penetration Eagfneorfng, or'rouso-H~inds Company,

t

'ost conductod by:)

)i

~ ' )

ef~CGo

Josoph Sudz iusTos t Eng incor

Approved by:

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Alo" .Vi t!<usChiof Engineer

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NRP PEIir TRATICCf

SHORT CIRCUIT TEST ON 42 Ab'G LCM VOLTAGE UNIT

DEVICE TESTED

A Crouse-Hinds Company low voltage electrical penetration assembly, Sample No. 2,per Catalog No. 0100253-1, having thr'ee (3) pairs of cables identified as PairsItAll IIBll d ItCll

PROCEDURE

The Crouse-Hinds test sample was installed in the High Current Laboratory and each

pair of cables were connected, in turn, to the A and B phases of a 4375 kVA

generator and subjected to a total of seven (7) single phase short circuit testsat individual curren magnitudes, ranging from 8.56 total kA (T ial 41) to 37.4tota1 kA (Trial j7) measured at maximum crest of first period.

Each of the three pairs consisted of adjacent cables in 'the penetration assembly,and each pair was short circuited by a short length of cable at far end of sample.

There was no external bra,cing or mechanical support of the free ends of cables forTrials No. 1 through No. 6.

~ Prior to Trial No. 7 (last test), the free ends of 'C" cable pair were tapedtogether with glass tape (at both lire and short circuit ends),

The test current was initiated by a synchronously controlled making switch andinterrupted by the generator back-up breaker. Duration of current flow ranged from2 to 4 cycle s .

Measurements of insulation resistance, conductor resistance and gas leakage de-tection were made on each cable pair before test, after Trials No. 3 and No. 7.

The insulation resistance was measured with a 500 volt meggar set.

The conductor resistance was measured with a Kelvin Bridge.

The gas leakage detection checks were made at 65 PSI of air with a bubble solutionknown as "Snoop".

Temperature measurements were made midway of shorting cable with a therocouple andbridge, after Trials No. 5 and No. 7.

A Siemens Magnetic Oscil1omat was used to monitor t¹ current flow and time for alltrials.RESULTS

1. Three external splices or joints fs.iled when cable pair "A" was subjected toapproximately 37.0 total 1A, Trial No. 6.

2. Cable pair "C", having the additional strength, contributed by the glass tapewrapping, withstood 37.4 total kA.

3. Refer to Tabulations of Data for complete listing of current measurements,insulation resistance, conductor resistance and observations.

Francis J. Ke13yRichard Greene

Crcuse-Hinds Company

SHE'ET L of

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UNITED STATES

NUCLEAR RfGULATORYCOMMISSIONWASHINGTON, D. C. 20555

i~IEMORANDUiiI FOR: TERA CORPORATION

FROM:

SVBJEC'Z:

US NRC/TIDC/DOCUIIENT MANAGEMENT BRANCH

Special Document Handling Requirements

Cl i. Please use the following special distribution list for theattached document.

a 2. The attacQed document requires the following specialconsiderations:

O'o not send oversize enclosures to the NRC PDR.

ERnly one oversize enclosure was received - please returnfor Regulatory File storage. ~~~~ ~~~~ I QQ-

CI Proprietary information - send only non-proprietaryportions to the NRC PDR.

El Other: (specify)

cc: DMB Files TIDC DMB Authorized Signature

0

REGULATORY. INFORMATION DISTRIBUTION SYS'fKM (RIOS)

ACCKSSION NBRo8007290740 DOC+DATE: 80/07/21 NOTARIZED: NO DOCKETFACIL:50-244 Robert Emmet Ginna Nuclear Planti Unit lg Rochester G 05000244

AUTH

BYNAME

AUTHOR AFFILIATIONWHITEgL~ D ~ Rochester Gas 8 Electric Corp,

RFCIP ~ NAME RECIPIENT AFFILIATIONCRUTCHFIELDg D ~ Operating Reactors Branch 5

SUBJECT: Forwards comments on NRC assessment of SEP Topic VIII~4transmitted by OL Ziemann 800324 ltr.Alsopforwards responsesto addi questions raised by review. Over size drawings

I available in Central Files only.,

DISTRIBUTION CODE: A035S COPIES RECEIVED:LTR g ENCL„g SIZE!~>TITLE: SEP Topics

NOTES: 1 copy:SEP Sects Ldr ~ 05000244

RECIPIENTIO CODE/NAME

ACTION: CRUTCHFIELD 19

INTERNAL! A/D MATLEQUAL16. D/DIRg HUM FAC S

HYD/GEO BR 17N R 02

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2307

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JUL 30 198g

TOTAL NUMBER OF COPIES REQUIRED! LTTR 39 ENCL

f[

0

'F'e

////////////ll(S'/////

/I/ //ZSF/8

ROCHESTER GAS AND ELECTRIC CORPORATION

i

II/IS

o 89 EAST AVENUE, ROCHESTER, N.Y. l4649

LEON D. WHITE. JR.VICE PRESIDENT

TELEPIIONEAREA CODE lid 546.2700

July 21, 1980

Director of Nuclear Reactor RegulationAttention: Mr. Dennis M. Crutchfield, Chief

Operating Reactors Branch 55Division of Operating Reactors

U.S. Nuclear Regulatory CommissionWashington, D.C. 20555

Subject: SEP Topic VIII — 4 Electrical Penetration of ReactorContainmentR.E. Ginna Nuclear Power PlantDocket No. 50-244

Dear Mr. Crutchfield:This letter will serve as Rochester Gas and Electric's

response to the assessment of SEP Topic VIII-4 issued by letter, dated March 24, 1980 from Mr. Dennis L. Ziemann. Specific comments

are enclosed for your review.

We have reviewed the concerns set forth in the SEP TechnicalEvaluation and believe that clarification of certain designfeatures of the Crouse Hinds electrical penetrations will resolvethem. The following information is provided to supplement ourApril 12, 1979 submittal and to permit revision of the StaffTechnical Evaluation.

Silver brazing is used in the two largest categories ofpower penetrations while soft solder is used on allothers. However, the NRC Staff assumed a soft. solderseal for all-penetrations. This greatly understatesthe thermal capabilities of penetrations using the hightemperature braze. The melting temperature for thesilver brazing is 1100'F or 600'C.

Formula 1 obtained from the RG&E's submission (IPCEA-P-32-382) was developed to allow the user to determinethe maximum time a cable may be subjected to a shortcircuit load without damage to the insulation. Theformula is based on the heat content of the conductormaterial and the temperature limits of the insulationwith the assumption that the time interval is so shortthat the heat developed during a short circuit is con-tained in the conductor.

C ~

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ROCHESTER GAS AND ELECTRIC CORP.

DATE July 21, 1980Mr. Dennis M. Crutchfield

SHEET NO.

Consequently, this expression should not be used todetermine the time it takes to reach the maximum shortcircuit temperature of the bushings used in Ginnapenetrations since it does not take into account anyheat dissipated. The "heat sinking" will greatlyincrease the time to melt a seal for a given shortcircuit current. A more realistic approach is to usethe actual test data for each penetration to2make sucha determination. Specifically, the tested I t valuescan be adjusted to account for a 140'C ambient temperatureusing the relationship shown as Formula 1.

The I t value for the N2 AWG size penetyations, using2

the C-H'test data shown below is 7 x 10

TEST DATA: 37."4 KA total RMS (64.8 Maximum Peak Current) for3.0 cycles.

To adjust this value. to a 140'C ambient a factor derivedfrom formula 1 can be developed as follows for the softsolder seals:

0 0180 + 234140 + 234

I t (25'C) .0297 A log 180' 234'2

25o + 234o

I t (140o)

I t (250)

Thus the I t for thy N2 type penetration at 25'C can be2

reduced from 7 x 10 to 1.4 x 10 to include a 140'Cambient. The resulting allowable time2is determined tobe .15 seconds at 9.6 KA. Using the I t values forthis specific penetration yields a more realisticresult. The backup clearing time for the AE-6 penetrationof .1 seconds is sufficient to comply with the staff'scriteria.Therefore, all penetrations are acceptable: the twolargest power penetrations because they employ silverbrazing and not soft solder and all other penetrationsas analyzed above.

2. There are two large penetrations used to feed thereactor coolant pumps. The Technical Evaluation postu-lates that, one of the two feeds opens, without a fault,causing the remaining feed to overheat when subjectedto full load current. The calculated time to failurewas 6.5 minutes.

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ROCHESTER GAS AND ELECTRIC CORP.July 21, 1980Mr. Dennis M. Crutchfield

SHEET NO.

This conclusion is based on a soft solder seal andcontinuous current ratings of the cable. In actuality,this penetration has a silver braze seal and has acontinuous current rating of 1000 amperes. The 450ampere rating in the RG&E report reflects the rating ofthe 750 mcm cable. Should the postulated conditionoccur, remote as it might be, no seal failure wouldresult. There would, however, be a degradation of thecable insulation and a breaker trip would result toclear the problem once the insulation failed.

3. The staff's evaluation of the CE-21 penetration indicatedthat no data was submitted on mechanical stresses ofthe tested values. The C-H testing program demonstratedboth the ability'to withstand short circuit currentsand the mechanical stresses associated with the highasymetrical test currents. The test. reports ( seeenclosures) indicated that certain penetrations requiredadditional bracing in order to pass. The requiredbracing was installed.

4. The direct current penetration, CE-23, does not complywith the staff's criteria in that the backup device, atall fault current levels, does not respond fast. enoughto prevent a seal failure. Both the primary and secondaryprotective devices are fuses. The most likely failuremode is for the fuse to fail open. However, all dccontrol circuits in all penetrations will be reviewedand additional fuse protection will be installed.

5. A concern has been identified in the evaluation reportwhich deals with low magnitude faults. While somebackup devices respond to high level faults they do notclear in sufficient time on low magnitude faults. Lowvoltage penetrations, CE-21,AE6 and the medium voltagepenetrations CE-25 and 27 are currently being reviewedto improve the backup breaker characteristics.

When the reviews described above are complete the Ginnaelectrical penetrations will meet current licensing criteria foroperating plants. That is, the as-built penetrations were designedso that the containment structure can, without exceeding thedesign leakage rate, accommodate the calculated pressure andtemperature resulting from any loss of coolant accident.

44

IL

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h,

ROCHESTER GAS AND ELECTRIC CORP.July 21, 1980Mr. Dennis M. Crutchfield

SHEET NO.

Enclosed please find, responses to the additional questionsraised by a member of the NRC Staf f concerning this SEP Topic.

Very truly yours,

0

II

'l l

td l -II, IL II

f

Response to NRC's

Reguest for Additional InformationRef': SEP TOPIC VIII-4, ELECTRICAL PENETRATIONS

Question: 1. Please provide responses to the following:

a) Quantify the softening point of the silver brazing usedin your larger penetrations and identify the basis forthis point.

Response: The softening point of the silver brazing used in the500 mcm and 750 mcm, Configuration Sketch "E" typepenetrations is assumed to be the lowest temperaturelisted for silver braze as shown in attachment. 1. Thelowest ASME classification of brazing filter metalsrange from 1145-1400'F. For conservatism 1100 F or600'C is used.

Question: b) Clarify the discrepancy between your citation of silverbrazing in the subject letter and the statement made byyour Mr. George Link to Mr. A. C. Udy of EG&G Idaho 'tothe effect that your analyses were all based on solderedseals.

Response: It should be noted that the term "silver solder" isoften used to describe the material which shouldproperly be referred to as "silver braze" in accordancewith the ASME definition, so that some misunderstandingmay have developed.

C-H has recently located additional drawings whichdetailed the high temperature braze seal'nd whichestablishes the 1000 ampere rating on the bushing.These drawings enclosed as attachment 2.

Question:

Response:

c) Clarify the discrepancy between the statement in yourletter that silver brazing is used in the largest powerpenetrations and the statement in your April 12, 1979report that, "Details of each penetration can be seenon the Crouse-Hinds drawings ....". (Crouse-HindsDrawing 0100350 Sheet 2 of 3 states that the 750 mcmpenetration has a glass/metal feedthrough.)

The glass/metal feedthrough detail shown on C-H drawing0100350 sheet 2 of 3 applies to configurations A,B,C,Dand F only and not to Type E, the 750 mcm penetration.The C-H drawings of the power, penetrations show thesilver braze used to seal the conductors fed throughthe bushings.

f

Question: 2. Please provide responses to the following:

a) Clarify the discrepancy between your reference to testdata and Paragraph 2.52of your April 12, 1979 reportthat states that the I t values were calculated.

Response:

Question:

Question:

Response:

The "manufacturer's calculations" referred to inparagraph 2.5 are based on test, data for penetrationtypes A and E. All others were based on analysis.

b) If the I t values were calculated, provide the mathe-2

matical models of the containment and penetration heattransfer that were used in the calculations. If actualtests were run, provide a description of the testset-up, procedures, and results.

c) Justify the use of a single test point to determine theshape, slope, and intercept of a line.

The ambient temperature condition during short circuittesting was assumed to be 25'C. (he data (current andtime) were used to establish an I t function which wasthen adjusted using formula 1. The model assumes thatall heat developed during the short circuit is containedwithin the conductor so that penetration geometry andheat transfer characteristics are not used. It shouldbe noted that, IPCEA P-32-382 is based on this conservativemodel. Since the IPCEA standard does not, contain anexplicit derivation of the I t relation, we haveincluded one in the attachments. Since no heat isassumed to be transferred out of the conductor, theadjustment of I t values for different ambient. tempera-tures is accomplished by changing the initial temperaturein the IPCEA formula as described in our letter.Certified Test Reports are included as attachment 5.

Question

Response:

3. Justify using the 450 amp cable rating for the 750 mcmpenetration in your April 12, 1979 report and provide thebasis for the 1000 amp rating you now wish to use.

C-H has recently located design information on theAlite bushing used on the 750 mcm penetration. Thesedata are enclosed as attachment 3 which show that thebushing and seal integrity are 'rated for 1000 AMPS.

ATTACHMENTS,TO

RE VEST FOR ADDITIONAL INFORMATION

I

Ref: SEP Topic VIII-4, Electrical Penetrations

2.

3.

5.

ASME Table QB-432 Grouping of Brazing Filler Metals

Crouse-Hinds Drawings-0100332 — High Amperage Insulator

For 75 mcm; 5 Kv0100292 — S/A of Insulator and Cable

Seal for 750 mcm cable

Data Sheet. — Alite High Amperage Bushings

Derivation of the IPCEA, / I) t formula(A)

Crouse-Hinds Test Reports:

a) Certified Test Report on Electrical Penetration3 Conductor M-573-1968

b) Short Circuit Test on 52 AWG. low voltage limit

I,

DATA—

QB430 F-NUMBERS

QB-431 Gcncrttl

All p:i es in this Article are identified by thenumber I 1-3, followed by the specific page identi-l'ying nuinhcr, which is indicated at the bottom ofetlcli I):180.

Tlic lollowing F-Number grouping of brazing fillermetals iii QB-132 is based essentially on theirusability characteristics, which fundamentally deter-

F-NUMBERS QB-430-QB-432

mine the ability of brazers and brazing operators tomake. satisfactory brazements with a given fillermetal. This grouping is made to reduce the numberof brazing procedure and'performance qualificationswhere this can logically be done. The grouping doesnot imply that filler metals within a group may beindiscriminately substituted for a filler metal whichwas used in the qualification test without consider-ation of thc coinpatibility from the standpoint ofmetallurgical properties, design, mechanical proper-ties, and service requirements.

r) S>mfa

QB-432F-NUMBERS

Grouping of Brazing Filler Metals for Procedure and Performance QualificationSFA-5.0

Recon<»tended JointClearance at

Brazing Temperatures, In.

F- AS MEQB No. Classification Nominal Composition, %

Ag Cu Zn Cd Ni Li Other

Brazing RangeTemp,

F

WithChemical

Fluxes

WithAtmosphere

Brazing'32.1

F.1 01 BAg-1GAg.laGAg.8GAg Ga

432.2 F-1 02 GAg-2GAg-2aGAg-3OAg.4OAg.5GAg 6BA-7OG-13BG.13aOG-18

45ro7272

35305040455056545660

15 1615.5 1 6.528 .. ~

27.8,

26 2127 2315.5 15.530 2830 2534 1622 1750 54230

2418

182016 3

2

1

2

0.2

5Sn

10 Sn

0.025 P

1145-14001175-14001435-16501410-1600

1295-15501310-15501270-15001435-16501370-15501425-16001205-14001575-1775ieoo-18oo1325-1550

0.001&.0030.001&.0030.001-0.0030.001&.003

0.002&.0050.002&.0050.002-0.0050.002-0.0050.002-0.0050.002-0.0050.002-0.0050.002%.0050.002-0.0050.002-0.005

0.000-0.0020.000-0.0020.000%.0020.000-0.002

0.000%.0020.000&.0020.000-0.0020.000%.0020.000%.0020.000-0.0020.000-0.0020.000-0.0020.000-0.0020.000-0.002

OG-19 92.5 7.3 0.2 1610-1800 0.002-0.005 0.000%.002

432.3 F-103 GCuP-1BCuP-2OCuP.3BCuP.4OCuP-5

Cu

Rem.Rem.

Rem.

Rem.Rem.

Ag P

5'.35 e6 7

15 5

1450-17001350-15501300-15001300-14501300-1500

0.001&.0050.001M.0050.001%.0050.00M).0050.001M.005

NOTES:t1) For n<ax<h»u:» strength use a press fit at room temperature, of 0.001 in./in. of diameter.(2) Au«osphere I.'razing includes brazing in vacuum, in addition to such gaseous atmospheres as hydrogen, argon, dissociated ammonia, etc.

Attachment 1 (QO 432 contin«cs on next page)

l

~ A

SILVER

/j ) )" C~ LVx-)J ~ I'< )-'4 0BBAZItNGM,E.OVS STOCK NUMBER

:)lBCO high purity silver brazing agoys

":ICOSIL35(alloy has a wide range between melting and flow points.

~s more sluggishly and is used where fit-up is poor and"la(ge fillets are desired.

WireSize

1/32"3/64"1/16"3/32"1/8"

Random . 4 oz.Coils Package

925-3501 925.3541925.3500 925.3540925.3502 925-3542925-3503 925 3543925.3504 925-3544

50 oz.Package

925.3551925.3550925-3552925 3553925.3554

<':ICOSIL 45:nbe used for such similar applications as AIRCOSIL So.:".oy has a lower melting point than AIRCOSIL50.

I'BCOSIL 50:>,vncral purpose alloy suitable for brazing assemblies of!. alloy, tool and stainless steels, copper; nickel and

:))Inr combinations of these metals.

1/32"3/64"1/16"3/32"1/8"

1/32"3/64"1/16"3/32"1/8"

925.4501925.4500925.4502925-4503925.4504

925.5001925.5000925.5002925.5003925 5004

925-4541gzs.nsno

'25-4542

925.4543925.4544

925.5041925 5040925.5042925.5043gzs.sonn

925.4551925.4550925 45529254553925 4554

925-5051925 5050925 5052925.5053925 5054

'-'.)tITIFICATIONOF AIRCOSIL SILVER BRAZING ALLOYS

AWS-ASTM Solidus>1IBCO Alloys Class „Silver Copper Zinc Cadmium Others F

LiquidusoF

BrazingTemp.

Range oF

( ~ \ I

I ~ ~

I))) ~(

()lt~)()i~

<)i.)(I(, ~

.) I ~"

:.'BCOSIL 50')itCOSIL 3'tBCOSIL 45'(IICOSIL 35',tilCOSIL 30:tACOSIL 5: tACOSIL 15'tACOSIL

A')ACOSIL8'.tBCOSIL

C'.(IICOSIL0:)BCOSIL E

'titCOSIL F

uitCOSIL G

",ACOS)LH'IftCOSILJ

ACOSIL K.)ACOSiL L:)BCOSIL M')ACOSIL

P'iCOSILR

:'tCOSIL 60anni Alloys

BAg 1a 508Ag.3 . 50BAg.1 45BAg 2BAg.2a 308CuP-3BCuP.5 16

9202030

BAg.4 4040

BAg 5 45BAg.6 50BAg.7 56

60BAg 13 54BAg-8'2

8540

made on special order only.

15.5 16.515.5 1 5.515 1626 2127 2388.758053 3845 3545'038 3230 2836 2430 2534 1622 1725 1540 528

30 253

''VEBSMITH SOLDERS

"WICOSII. Easy")ICOSIL Medium-'ICOSIL Hard

65 20 1570 20 'lo75 22 3

'MPHORUS AND PHOS-SILVER ALLOYS

18'6

241820

Ni3

P 6.25P5

Ni 2

Sn5

Ni1

Mn 15Ni5Sn 10

11601170112511251125-11901185141013151140137012401235125012701145124613251435176012401115

124012751365

117512701145129513101480150015651 5001500141014351415137014251205132515751435177815601325

1325'l 3601450

1175.14001270 15001145-14001295-15501310.15501300-15501300 15001600 17501500.17001500 17001410 16501435.16501445-16501370.15501425.16001 205.14001325 15501575 17751435-16501780 21001560-17501325.1550

1325.15501390-16001450 1650

(ltn

I ')0152l53ISn

'nt Co pper.Rod"",ot Copper Strip)sos Silver 6r"o).Silver 6M«nt Silver 2

BCuP-2BCuP-1BCuP 4BCuP-3

662

93.9587.5889'I

P7PsP 7.25P6P7

13051305118511901190

1485165013801480,1450

1350 15501450 17001300 15001300 15501350-1500

5.3

PtAttachment 3

MPIH ANjPSBASS 8USHlNGS

Alite high current, hermetically sealed bushings arequickly and easily brazed or ivelded into final as-

semblies to form strong, trouble-free, gasketlessbonds capable of ivithstanding very high temper-atures. Their mechanical strength characteristicsand thermal shock properties far exceed those ofglass or porcelain, Impact- and corrosion-resistant,Alite high amperage bushings retain their superiordielectric properties at elevated temperatures. Theirlustrous smooth, hard, easy-to-clean glaze assureshieh surface resistivity.

I3/I6'-

II/I6'I.AZED

4 6 /I6

2.000"

Metal parts: Kovara

-P Pic

"'3p

4.r

ejgpr vQ

P Reg. T.M„Westinghouse Electric Corporation

PartNo.

MC-100HC-125HC-150HC-175HC-225

2.7503.2503.5004.0004.500

1

1'/4

1 I/s

1%2 '/4

«906

1 ~ 1561.4061.7192.156

1%1%22t/2

3

Current-CarryingCapacity(Amps)

5001000150020003000

eA' /. A " p. i p I«. 1 'A?i~+ «c 'ppcI. 4iaa784%%ik'~s..«e,p/tt)vA, '1 >+I'M ra 2+vi --AA<"+: . '+r,~+; i~',Ag" p',Ipp ~ «+<p.0t/ p'c spadix+ p~+A~'p~

~ ~ 'P Special purpose units shown: 1. Hermetic transformer housing2. High current bushing designed for hcavy center conductor.

and 4. Special high voltage custom designs.

PE

II 'P

P*

IP

I-. q

P'

P P

I". PP

-i1

I 'P ~ P

PP

"I

P

P

P PP

P P

p P «..<.'~<C«Ip~«IPt«(PP Ph

'P

VPPIP S

t'

HIGH TENPERATURE HERNETICBONDING PROCESS

Our method of high temperature metal-lizing and brazing provides a ceramic-to-metal seal that is strong, permanent andvacuum-tight. In this process, a specialrefractory metallizing compound is appliedto the ceramic over areas ivhere metalcomponents are to be bonded. Subsequenthigh temperature firing in a controlled at-niosphere produces a smooth integrally-bonded metallic surface to which the met-al parts are then brazed with fine silver orother high temperature braze metals. Dueto the inherent high temperature stabilityof the ceramic and the bond, operatingtemperatures of Alite terminals are re-stricted only by the tern'perature and oxi-dation limits of the braze material andmetal parts.

NETAL PARTS

bietal flanges and terminal caps areformed of low expansion type nickel-iron

with fused-on silver plating. On specialorder other types of plating or other metalssuch as nicl'el, iblonel, copper, or st'ainlesssteel can be supplied to meet dilferent en-viron»iental conditions. Terminal studsmade of nickel plated low carbon steel orunplated type "R" illonel are included asstandard equipment. Studs made of othermaterials in various finishes, lengths andthread sizes are available on special order;Terminals can also be supplied withoutstuds, or with center conductors.

FINAL ASSENBLY NETHODSThe sturdy construction of Alite terminalspermits a wide range of installation tech-niques. For service at extreme high tem-peratures they are usually brazed to mainassemblies by torch, induction or furnacebrazing. Welding the terminals to equip-ment is also possible by resistance or inertarc welding techniques. Low temperaturesoft soldering is a suitable method of

\

4

r

l

Attachment 4

.:DZBIVATXQN:of the IPCEA, I t Formula.2

A

Assume all ohmic heat is retained within the conductor during theshort circuit. (i.e. adiabatic heating)

QRLA

~(T)CpTo

heating rateconductor resistanceconductor lengthconductor cross sectional areaconductor resistivityconductor specific heat, capacityEffective absolute zero for conductormaterial (Celcious scale)

Conductor heating rate per unit length,

Q/L = I RL

R = ~L(~TA

Q/L= I ~TA

Rate of change of temperature.

dT I ~TA Cp

~(T) = r(Tc — To)

dT I r (Tc — To)dt A Cp

let Tc — To = I

2 ~ ( (~)2Jl 0

dtrCp

I

CER71FlED TEST REPOP7

'NELECTRl CAL PENETRATI ON» g CONDUCTORS

REPORT

~1-575

CROUSc. - H I NDS CO",tPANY

BY

KEARNEY COi-',(PAN

ELEC7RlCAL RESEARCH LABO'RATORY

DcCOOA, 1LLlNOlS

1 9o8

~ 1 I

~ e

e

Kearney Comipany

Electrical Research Laboratory

)hcCook, l l l inoisSama I e Des cr i o t i on

'. Conductors under testUnused conductor

750 I'ICOS

500 A(CN \

Sample identified as a mock-uo unit with lov< voltage ceramics,Cat. No. Ol 0025 l ~ order No. F«8/$ 77-C.

2o Ob ect of Tes,

Electrical penetration - $ conduci or, consisting of stain! ess-steel canister, 8" pipe, 5 feet long~ with 2 headers niih gceramic insul arors in eacho Three conductors vlere trainedand braced internally with fiber discs.

invest i gate short»c ircui t current capab i l it les of tho des i gn,.~tP, 1'

~ 4 '8, i 968.

A, Shot /III, (t),700:A asym. RNS f or 8~ cyc I es, osc. I/7(For current calibration see osc. !$6-60,000 A.Sym, RBS)After the shot, test sample resistance, includingleads of ihe bridge circuit, was measured at 27 mM.. '

KV DC vol tage was appl ied to measure leakagecurrent « negligible (pA range)'o

No gas leak deiected at 65 psi by "SNOOP"No visible damage to ceramics or bracing discso

S.. Shot /E2,,6?j,000 A asyn.RI!S .fo; 7 cyc I es, osc. !58(Usa cal ibration osc. I/6),After the shot, resistance and leakage curreninere about the samie.

, Highor gas.! eak detected. on,u.nwedge'd.;.cer.amiesNo leak on wedged ceramics.No visibl o damage to corqmlcs or bracing discs't

~

1

(Cont inuod Page 2o)

~ !" ~~

1

~ ~

~ ~

i~

>~ "575Pago 2o

EE

Kearney Company

Ii'cCook, illinois E

I

C, ~Shot fr'" 'Cont Inca d -')This was' one-hal f cyclo test shot fo morel y

- reduce possibility of an inrush current to thetest transformer.occurring on the HV side offes t trans former dur ing the .f ol 1 ovilng fes t,See osc, fLIO.E

0, ~Shot EI, 7l E)IOO A asyn. RIIS'or 9 cycles, osc. Ilail(For current cal ibration see osc 1$ 9--80,000 A sym. RAS)After the shof, resistance and.leakage currontwere ab'ou? the same,

'No additional gas leakoNo vis lb 1 e damage fo ceramics or bra'c ing discs.

E. Shot 8~5. No tesf: see exp l anat lan unde," shot gj$ o See os

R, . Shot: sE 6. 79,200 A asyrs, 'Rl'IS for IOh cycl osE osc, ILI9(Usa ca! !brat Ion osc, !99I.After fhe shot, res is?ance and 1 ca<age currentvier e ahou the saneoNo gas leak.No visible damage fo ceramics or bracing discs,

II

G, ~Shot / HOI IOO,A asym. RIIS froIO cyclos, osc, Ilp(Use cai ibrai ion osco lg9).A f I er the shot, res is?ance and 1 eakage current

~ v(ere about the samooNo gas 3 eakoNo visible damage to brac ing d;scs.

Test CircuitThe rest sampl o vias. energized through a 12,000 KVA 9KV specialmomentary frans former, connected f or $ 60V on the .secondary{fes f ) side.Closing in for maximum asymnetry vias accompl ished by sparkingover an air gap viil'h a f25KV surge gene!-ator synchronized tof ire at 0 of the 60-Hz supp l y vol tage.Desirablo short dura? ion timing was approximafod by using anappropriate back-up protect ion fuse cutout,Curreni s f hrough f he tos t spec imen were measured by means o fa current transrormer on the high»vol fage s'lde of fhe

12,000'YA

test transformer. Durations or" current f1ovi vlere coun? odln cycles from acfua] oscil lograms,.

'

~

.(Continued Pago'o )I ~ E

s

\

ES

~ ~

Koarncy Company

J".cCook~ l l l inois

. ~>h-575'ago jo

Asymmetr ical Rh(S currents v.'ere determined in accordance vti ththe appendix of Ai EE "Standard for Air SvIi tches, insul atorUnits and 8us Supports", Publ. No, 22, dated lharcn, l960;see curve h'l of F 5..igo

Certification

-(Continued — )

Al l measurerm nts nero made in accordance vIith the appl icablostandard specifications. Common sound engineering practicesv(ero fol lovIed in measurements nor spec ifical ly standardized,

Statements made and data shovin in this report,h(-57$ , con-s ist ing of 5 pages, are to rho best of my knowledge and bol lef~correct vjithin. the usual l imits of commcrclai testing practice,

Test v,'as nltnessed by '.(r. Jim Kel ly, Engineer, Nuclear~ Penotrat ion Engineering, of Crousc-H~inds Company,

..; Tost conducted by:'L ~

Joseph Sudz i usTost Engineer

~ =

Approved by:

(( i ~

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SHORT CIRCUIT TEST ON 42 ARTS LOH VOLTAGE UNIT

DEVICE TESTED

A Crouse-Hinds Company lowper Catalog No. 0100253-',IIAll 1IBII d ttCtl

voltage electrical penetration assembly, Sample No. 2,having three (3) pairs of cables identified as Pairs

C

The Crouse-Hinds test sample was installed in the High Current Laboratory and each

pair of cables were connected, in turn, to the A and B phases of a 4375 kVA

generator and subjected to a total of seven (7) single phase short circuit testsat individual, current magnitudes, ranging fxom 8.56 total kA (Trial jl) to 37.4 .

total kA (Trial g7) measured at maximum crest of first period.

Each of the three pairs consisted of adjacent cables in 'the penetration assembly,and each pai was short circuited by a short length of cable at far end of sample.

There was no external bracing or mechanical support of the free ends of cables forTrials No. 1 through No. 6.

Prior to Trial No. 7 (last t'est), the free ends of "C" cable pair were tapedtogether with glass tape (at both line and short circuit ends).

The test current was initiated by a synchxonously controlled making switcn andinterrupted by the generator back-up breaker. Duration of current flow ranged from2 to 4 cycles.

Measurements of insulation resistance, conductor resistance and gas leakage de-tection were made on'each cable pair before est, after Trials No. 3 and No. 7.

The insulation resistance was measured with a 500 volt meggar set.

The conductor resistance was measured with a Kelvin Bridge.

The gas leakage detection checks were made at 65 PSI of air with a bubble solutionknown as "Snoop".

Temperature measurements were made midway o2 shorting cable with a thexocouple andbridge, aWer Trials No. 5 and No. 7.

A Siemens Magnetic OsciU.omat was used to monitor the current flow and time for alltrials.RESULTS

1. Three external sp3.ices or joints failed when cable pair "A" was subjected toapproximately 37.0 total kA, Trial No. 6.

2. Cable pair "C", having the additional strength, contributed by the glass tapewrapping, withstood 37.4 total kA.

3. Refer to Tabulations of Data fox complete listing of current measuxements,insulation resistance, conductor resistance and observations. ~ ~

Francis J. KellyRichard Greene

Crcuse-Hinds Co;".pany

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