summary of 801212 meeting w/util re facility steam
TRANSCRIPT
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\ UNITED STATES /N''Cl.I AH REGULATORY COMMISSIONf i 7
,* WASHINGTON, D. C. * 0%5/
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Pt;d January 8,1981' e
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Docket No. 50-336-5
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Millstone Nuclear Power Station, Unit No. 2 (MNPS-2)FACILITY:
LICENSEE: Northeast Nuclear Energy Company (NfiEC0)
SUBJECT: SUMMARY OF DECEMBER 12, 1980 MEETING WITH NNEC0 ON MNPS-2
STEAM GENERATOR INSPECTION RESULTS
Introduction:NNECO had requested this meeting to present the results of the recentsteam generator (SG) eddy -current test (ECT) and profilometer inspection(PI) for the two MNPS-2 SGs.
Enclosure 1 is a list of the NRC, NNECOand Combustion Engineering Company (CE) attendees.
Summary:After opening remarks by the NRC (Conner), the meeting was turned overto NNEC0 and CE who presented and discussed the Enclosure 2 viewgraphs.P. F. Santoro (NNECO) covered the first 9 viewgraphs, J. M. Fackelmann(NNECO) the next 13 and W. J. Heilker the remaining 14 viewgraphs.Significant connients made in relationship to a certain viewgraph were:
2. The PI is supplementary to ECT and allows determinations ofthe ovality of dents at the egg crates;
7. No major changes seen at this one elevation.8. The large jump in the number of tubes plugged in 1978 was ,
preventive maintenance;9. Highlighted the importance of the condensate polishing systems
to reduce chlorides;
9. All volatile control since day one;
10. B&W profilometer probe has 8 fingers that contact the tube.Zetec probe gives same data without contacting tube (ECT type);
12. The present average of all dents is about 10 mills;18. The calculated strain is greater at the inside surface than at
the outside surface;19. Viewgraph shows agreement between B&W and Zetec probes;20. The SG inspection program took a total of 3 days;20. The profilometer measurements versus ECT data;21. Data shows no change in the last year of measured dent size;22. Important conclusions;25. The analysis takes no credit for the vertical supports or
partial detached grid plates;30. The LOCA + SSE analysis results are conservative since the
support provided by the vertical supports and partial detachedgrid plates is neglected;
81012 90 "| } Q J-
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Meeting Summary for| Millstone -2-
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33. The main steam line break + SSE analysis results are lessthan LOCA + SSE; and
37. Conclusion reached from analysis.
In the concluding remarks, Mr. Santoro stated that profilometer inspectiongives better definition of what is occuring at the egg-crate supportsthan ECT. The analysis results can be used in the selection of which SGtubes should be plugged. This is a considerable improvement over thego-no-go gage (ECT probe) presently used. NNECO intends to continuethe use of PI along with ECT in future SG inspections.
E. L. onner, Project ManagerOperating Reactors Branch #3Division of Licensing, NRR
Enclosures:As stated
cc: w/ enclosures#ee next page
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MEETING SUfe%RY DISTRIBUTION
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(Licensee: Northeast Nuclear Energy Company)
i
o Copies also sent to those people on service (cc) list for subject plant (s).
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Docket File. NRC PDR
L PORTERAHSICORB RdaNRR RdgHDentonECaseOEisenhutRPurpl eRTedescoTNovakGlainasRReidTIppolitoSVargaDCrutchfield -
RAClarkORB Project Manager "
Licensing AssistantOELDAE00 - JHeltemesIE-3
SShowe (PWR) or CThayer (BWR), IE
RFraley, ACRS (16)Program Support BranchGZech
.01shinskiBGrimes , DEPSheldon Schwartz, DEPFPagano , EPLBSteve Ramos, EPDBMtg. Summary Dist.ERC Participants
EConnerRGambleJGrant
,
EMurphy
DHuangRAClark
Northeast Nuclear Energy Company ,
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cc: Mr. John ShedloskyWilliam H. Cuddy, Esquire Resident Inspector / MillstoneDay, Berry & Howard c/o U.S. NRC
j
Counselors at Law P. O. Drawer KK )One Constitution Plaza Niantic, CT 06357Hartford, Connecticut 06103
Anthony Z. Roisman Mr. Charles B. Brinkman|
Natural Resources Defense Council Manager Washington Nuclearj
917 15th Street, N.W. CjPWashington, D.C. 20005 Po r stems -
k"e le -1" "
Mr. Lawrence Bettencourt. First Selectnan elBethesda, Maryland 20014~i at "
g eg d - 200 Boston Post RoadWaterford, Connecticut 06385
Northeast Nuclear Energy CompanyATTN: Superintendent
Millstone PlantPost Office Box 128
Connecticut Energy AWaterford, Connecticut 06385 ATTN: Assistant Dir cto , Research
and Policy DevelopmentDepartment of Planning and Energy
Director, Criteria and Standards Division PolicyOffice of Radiation Programs (ANR-460) 20 Grand StreetU.S. Envirorinental Protection Agency Hartford, Connecticut 06106Washington, D.C. 20460
U. S. Environmental Protection AgencyRegion 1 Of ficeATTN: EIS COORDINATORJohn F. Kennedy Federal BuildingBoston, tussachusetts 02203
WaterfoM Public LibraryRope Ferry Road, Route 156Waterford, Connecticut 06385
Northeast Utilities Service CompanyMr. James R. HimmelwrightATTN: Nuclear Engineering and Operations
P. O. Box 270Hartford, Connecticut 06101
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Enclosure 1
MILLSTONE - 2
STEAM GENERATOR TUBE INSPECTION
MEETING - DECEMBER 12, 1980
NAME POSITION _
NRC-0RB#3E. ConnerNUSCOP. Santoro
J. Fackelmann NUSCO
W. Heilker CE-Component Eng.NUSCO-Generation Engineering
G. Johnson NUSCO-Generation EngineeringL. StarnerNRC-ORB #3R. Clark Florida Power & Light Co.
R. Acosta Florida Power & Light Co.T. Grozan
CEE. KennedyCE-BethesdaC. Brinkman
R. Gamble NRC-MTEBNRC-MTEBJ. GrantNRC-MTEBE. MurphyNRC-MTEBD. HuangNUSCOM. CassCER. Jacques
A. Sudduth Duke Power Co.
J. Jandovitz Consumer Power Co.
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Enclosure 2
MILLSf0NE UNIT NO. 2
STEAM GENERATOR REVIEW
INTRODUCTION -- NUSCO
PROFILOMETER INSPECTION -- NUSCO
STRUCTURAL ANALYSIS -- CE
SUMi1ARY -- NUSC0
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CliRON0 LOGY OF EVENTS
DECEMBER 1975 COMMERCIAL OPERATION
MAY 1977 CONDENSER RETUBING
DENTING DETECTION TSPL'S
IMPROVED CHENISTRY
NOVEf1BER 1977 EGG CRATE INl>ICATIONS BY ECT
RIM CUT
PREVENTATIVE TUBE-PLUGGING
CONDENSATE POLISHING
f1 ARCH 1979 PROFIL0 METER f1EASUREt1ENTS, 2 TUBES
AUGUST 1980 PROFIL0t1ETER INSPECTION, 300 TUBES
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ECT DATA hDENT / PLUGGING PROGRESSION
MILLSTONE UNIT NO. 2STEAM GENERATORS 1 & 2
|
'T /I DENT SIZEg, ,
TSPL'S NOS.10-11HL & CL (794) (799) (800)
8. g goo j. ,s .
$ PLUGGED TUBES h2_ 7. g.
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DENT SIZEEGG CRATE2 too. . .
NOS.1-9. HL
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1977 1978 1979 1980
YEAR I
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f MILLSTO.NE. UNIT N0. 2
| STEAM GENERATOR INSPEC110N
AUGUST 1980 OUTAGE
||
| VISUAL INSPECTION
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f ESSENTIALLY UNCHANGED
| RIM cut CLEARANCE INTACT
||
| EDDY CURRENT TEST SUMMARY
|
f140% TSPL, 13% EGG CRATES
ONE (1) BLOCKED IUBE
| ONE (1) IUBE PLUGGED
NO DENT PROGRESSION *
NO DEFECTS
||
CORRECTIVE ACTIONS STABILIZED DENTING
CONDENSER RETUBING - MAY 1977
RIM Cur, NOVEMBER 1977
PREVENTATIVE TUBE PLUGGING, NOVEMBER 1977
CONDENSATE POLISHING, NOVEMBER 1977
CHEMISTRY CONTROL: 0.6 PPM CHLORIDE
(12/75 TO 5/77)
0 (N.D.) CHLORIDE,
~ (5/77 TO PRESENT)
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*WITHIN IEST ACCURACY|
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STEAM GENERATOR PROFIL0 METER INSPECTION
| MILLSTONE UNIT N0. 2
l'
AUGUST 1980 OUTAGE
f'
OBJECTIVES
DEFINE EGG CRATE INDICAT. IONS
ESTABLISH DATA BASE FOR IMPROVING IUBE PLUGGING CRITERION
IMPROVE DEFINITION OF DENT EFFECTS
TEST PROGRAMi
STEAM GENERATOR NO. 1: 157 TUBES (B&W PROBE)
STEAM GENERATOR NO. 2: 143 TUBES (2ETEC PROBE)i
STEAM GENERATOR NO. 1: BOTH PROBES, 18 IUBES|
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OVALITYCALCULATED PROFILES
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TENSILE STRAIN, I.D.j
BOTT0ft 0F EGG CRATETENSILE STRAIN, 0.D.
MAXIMUM VALUES
MAXIMUM LOCATI0ils
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RELATIONSHIP BETWEEN MAXIMUM DIAMETER REDUCTION AND ELEVATION'
MILLSTONE UNIT NO. 2 -- STEAM GENERATOR NO1
AUGUST 1980 OUTAGE -- B&W PROFIL0 METER
DIAMETER
REDUCTION (MILS) STANDARD
ELEVATION NO. OF TESTS AVG. MAX. DEVIATION
1 157 24 71 17
2 157 35 72 16
3 157 38 76 15
4 157 30 70 15
5 157 29 87 16
6 157 18 59 12
7 110 15 52 12
8 30 6 32 6
9 13 3 6 2
1-9 1095 27 87 14
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PRELATIONSillP BETWEEN FRACTION OF MAXIMUM DENTS >20 MILS
(DIATIETRAL) AND ELEVATION
tilLLSTONE UNIT N0. 2; STEAM GENERATOR NO. 1
AUGUST 1980 OUTAGE -- B8W PROFIL0 METER
MAX. DENTS
ELEVATION NO. OF TESTS >20 fMLS, %
1 157 46
2 157 82
3 157 84
4 157 73
5 157 66
6 157 38
7 110 31
8 30 3'
9 13 0
1-9 1095 59
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RELATIONSHIP 0F MAXIMUM DIAMETER REDUCTION TO ELEVATION
MILLSTONE UNIT NO. 2; STEAM GENERATOR NO. 2
AUGUST 1980 OUTAGE -- ZETEC PROFILOMETER|
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DIAMETER
REDUCTION (MILS) STANDARD
ELEVATION NO. OF TEST AVG. MAX. DEVIATION
1 143 27 56 13
2 143 18 57 12
3 142 22 55 12
4 141 15 42 10
5 142 16 60 12
6 137 7 37 6
7 124 9 47 8
8 21 5 24 6
9 0 - - -
1-9 994 16 60 13 l
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REL TIONSHIP BETWEEN FRACTION OF (1AXI(1UM DENTS >20 MILS
(DIAi1ETRAL) AND ELEVATION
T1ILLSTONE UNIT NO. 2; STEAM GENERATOR N0. 2
AUGUST 1980 OUTAGE -- ZETEC PROFIL0 METER.
.
MAX. DENTS
ELEVATION NO, OF TESTS >20 tills, %
1 143 70
2 143 35
3 142 50.
4 141 30
5 142 27 -
66 137 '
7 124 10'
8 21 5'
9 0 0'~
1-9 994 33
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.
MILLSTONE UNIT N0. 2 -- STEAM GENERATOR NO. 2,
AUGUST 1980 OUTAGE -- ZETEC PROFILOMETER
.
TENSILE STRAIN,'%
INSIDE DIAMETER STANDARD
ELEVATION NO. OF TESTS MAX. AVG (2) DEVIATION
1 143 1.6 0.77 0.35
2 143 1.5 0.56 0.30
3 142 1.9 0.71 0.34
4 141 2.0 0.55 0.36
5 142 1.5 0.50 0.30
6 137 1.1 0.26 0.22
7 124 1.7 0.37 0.32
8 21 0.9 0.21 0.23
9 0 - - -
1-9 994 2.0 0.54 0.36
1. IN DENTED INTERSECTIONS
2. OF MAXIMUM VALUES'
' i8
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.
P.R,OBE.. M.EASUREMENT COM_PARISON ..!,. ; . .-- ._ ._ . . ,.
t .; . MINIMUM DIAMETER .' .- ;,s~
iL' i: ! DIFFERENCE (B & WW ZETEC)' ' '
-~
f |.:Q MILLSTONE UNIT NO. 2 J.' , "7, . y. 3-
L' STEAM GENERATOR NO.1%.:4.Y '. f\M, ,|n; ;y'a. . AUGUST 1980 QUTAGE,,CGgbyh6,
. .
-
.-- - ,. .=:_....,c
40 =
c/3 P
in iVO ;;j -
Z K+ s 3LLS
'..
L
@ 30 a, m - ,
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.
* C- s
O : :
0 20 = !'
2
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A -. A
,
NE<
ms .
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3 _,-
!' - r+ m :ceO M =: : ':* : -: *W W W * _v * W W- W W I W i W W 5
- 15. . .~10. 5 .0, 5 10 15 * 20 25.. 30 35 40...s .4 5 MICS. .- 5. . .30. 25 . 203..40
-
...a. . .
MIN. DIAMETER DIFFERENCE
.
%.
~_ _ _ _ _ _ _ . _ _ . _ _ _ _ _ . _ _
4 ...
COMPARIS0N CONVENT 10flAL EDDY CURRENT VERSUS PROFIL0 METER
MEASUREMENT OF DENT EFFECTS
filLLSTONE UNIT NO. 2
AUGUST 1980 OUTAGE
.
PROFIL0t1ETER, MILS
ECT, Mits SUPPORT AVG. aR MAX. AR f1AX. AD~
0 EC 0.5 6 7
0.5 EC 0.5 9 10
2 EC 4.5 44 68
10 TSPL 12 46 55
.
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20"
. ._- ._
4 .
.1
PROFIL0 METER MEASUREMENTS OF DENT PROGRESSION IN EGG CRATES
filLLSTONE IlNIT NO. 2, STEAM GENERATOR NO. 2
MAX A DIA., MILS MAX. I.D. STRAIN, %
EGG CRATE NO. 1979 1980 1979 1980
L 107 R 41
1 23 17 0.4 1.1
2 42 35 1.2 0.6
3 10 39 3.5 1.1
4 39 35 1.9 1.4
5 16 17 0.8 0.6
6 40 37 1.0 0.5
L 107 R 43
1 48 43 1.0 1.4
2 18 15 1.0 0.4
3 14 9 0.5 0.6
4 10 7 0.6 0.4
5 23 22 0.7 0.8
6 18 15 0.9 0.6.
AVERAGE-
BOTH TUBES-
1-6 25 24 1.1 0.8
r
!
+ 2
2L\,
'
.
.. - - _ _ _ _ _ _ - -
. .
.
SUMMARY
.
1. MOST Eco CRATE INTERSECTIONS DENTED, AS MANIFESTED
BY ONE OR MORE AD OF 10 MILS OR MORE, WITH AN'
ASSOCIATED OVALIZATION.
2. FREQUENCY AND MAGNITUDE OF DENTS LOWER AT UPPER
- ELEVATIONS.,
3. AXISYMMETRIC EFFECTS ASSOCI ATED WITH Eso CRATE DENTS
SMALLER THAN WITH TSPL DENTS.'
,
4. Ecs CRATE IUBE STRAINS LOW COMPARED TO STRAINS
ASSOCIATED WITH IUBE EAILURE IN-SERVICE.
5, DENTING ESSENTIALLY STABILIZED BASED ON NO SIGNIFICANT
PROGRESSION BETWEEN MARCH 1979 AND AucuST 1980.
.
>
22-
-_ _ ___ _- . . - .
-.. .
.
.
STEAM GENERATOR STRUCTURAL ANALYSIS
FOR "EGGCRATE" OVALIZATION
ACCIDENT ANALYSIS OF TUBES PER
REGULATORY GUIDE 1.121
1. RELEVANT TUBE SUPPORT GE'OMETRY.
2. TUBE SUPPORT ASSUMPTIONS BASED ON . INSPECTION DATA
3. LOCA + SSE EVALUATION OF BEND REGION
k.MSLB+SSEEVALUATIONOFBENDREGION'
5. SSE EVALUATION OF VERTICAL RISER REGION.
6. CONCLUSIONS
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* GE b SYSTEMS EGGCRATE TUEE SUPPORT DETAILS
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PERCENT OF INTERSECTIONS INSPECTEDWITH DIAMETRICAL DENTS) 20 m!!s VERSUS
ELEVATION MILLSTONE UNkT NO. 2
AUGUST 1980 OUTAGE90 -
^
80 --
70 -
-
6 STEAM GENERATOR60 -
y NO.1 ,.
mM 50 -
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!40 .-
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30 -
! 20 STEAD GENERATOR-
NO. 2 '
: 10 -
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1 2 3 4 5 6 7 8 9|
ELEVATION,,
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TUSE REIPONSE TO RAREFACTIO!! LOAD*
CAUSED BY LOCA
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FrFp = 37 etute To
ir
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/*NFLOW FLC'd.
sf
FLUID FCECES ACI::3 C;I TUBE D:AGGE.%TED LT !J:.CTICH.
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F.AREFACTICH LOAD AND STRESS VS TIP.E '
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LOCA + SSE ANALYSIS RESULTS.
FOR BEND REGION
1. MAXIMUM RAREFACTION LOAD ACROSS THE-
TUBE BENDS OCCURRED IN TUBE R0w 140:
F = 53.5 LBS. a 0,02 SECONDSmax
'2. MAXIMUM STRESS OCCURRED AT SUPPORT
ELEVATION NUMBER 9 (TOP PARTIAL -
"EGGCRATE"):
(I + T = 44.3 KS1( 7g B MAX 4ttow
.
WHERE EI = 1. 56 ( 7 S ) = 75.9 KS1ALLOW u:
'
ABOVE STRESS CONSIDERS LOADS DUE TO:. .
1) LOCA-RAREFACTION
2) LOCA IMPULSE RESPONSE..
3) SSE RESPONSE (HORIZONTAL)
4) INTERNAL PRESSURE
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S. G. SECONDARN SINE FLASH MODFLING-
31
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SECONDA1W FLO'<l AND - . .
TUBE IllTERACTION FORCES < 3,XAGGERATED 1)EFLECTIOliACTIllG Oil TUBE
Till1E DEFf.KCTIO!! DUM TO MSJ.h ACCJ1 Et1T l'lew.
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--____ - --_-
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MSLB + SSE ANALYSIS RESULTS
FOR BEND REGION
.
1. MAXIMUM PRESSURE DROP ACROSS THE TUBE BEND.
DUE TO SECONDARY SIDE BLOWDOWN WAS 32 PSI.
DISTRIBUTED LOAD ON TUBE IN R0W 140 WAS:
.
F/L = 0.232 LBS./IN. OR F = 33.4 LBS..
2. MAXIMUM STRESS OCCURRED IN THE TUBE BEND AND
WAS:.
= 22.4 KS1 'C '0'M+ B MAX 3ttow
~
WHERE = 1.356 (.7 S ) ""75.9 KS1ALLOW u
' -
ABOVE STRESS CONSIDERS LOADS DUE TO:
1) MSLB BLOWDOWN_
2) SSE RESPONSE (VERYlCAL-).
3) INTERNAL PRESSURE.
.
.
.
. . . .-
. . _ . _ . ._
o s
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SupportN0DAi.Elevations
POINTS
234.625 EC7 cm 29 dr--
O 27
197.625 EC6 a 25 :=
.
O 23-
162.875 EC5 === = c=
O.
O 19 O
| O,130.875 EC4 :== =s c=
| |.
! TYPICAL.
0 15,
.
E93.875 EC3 c=='
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11
59.125 EC2 c.m t== TUBE R0W 36.,.
:'
07 **
27.125 EC1 c=, es,
-
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~ j-f); i i o , i i , i io i i - -- ia
1
SSE EVALUATION OF VERTICAL RISER REGION
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I I e a 11 I I I I I I I l'l i I I I i II|| | |||| | | | || ||. | | l' | | | |!
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* FREQUENCY (CPS) #- N 'd/8'
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.
SSE ANALYSIS RESULTS
FOR VERTICAL RISER REGION.
1. LOADING RECORDING TO RESPONSE SPECTRUM FOR
VARIOUS ASSUMPTIONS:
2. SUPPORT EFFECTIVE CI MAXIMUM (KSI)B
(FOR ALL I'iODES)
IN-PLANE OUT-OF-PLANE
NO. 7 & TBSHT. 16.1 *- 15,8 -
NO. 6 & TBSHT. 11.0 12.9
NOS 6, 7 & TBSHT. 12.6 12.0
. NOS 5 - 7 & TBSHT. 13.0 9.8,
NOS. 4 - 7 & TBSHT. 13.6 13.1
NOS. 3 - 7 & TBSH.T. 16.1 *- 15.8'
NOS. 2 - 7 & TBSHT. 12.9 7.2.
,
THE ABOVE STRESSES ARE COMBINED WITH INTERNAL;
PRESSURE STRESS. -
(7 = 21.5 KSI 6M B MAX 4ttow
WHER'E U' ALLOW = 1. 356 ( .'7 S ) = 75.9 xS Iu,
.
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4
CONCLUS10tlS
.
1. BASED ON PROFILOMETRY DATA, SOME VERY CONSERVA-
TIVE ASSUMPTIONS WERE MADE RELATIVE TO EFFECTIVE
TUBE SUPPORTS.
2. HIGHEST ACCIDENT STRESS OCCURS FOR LOCA + SSE:
4.3 KSI <( U~3ttaw = 75.9 KSI=
max,
.
3. EXPECTED WORST CASE VIBRATORY STRESSES DURING
NORMAL OPERATION:
CT = 0. 5 KS I.
4. ANALYTICAL AND EXPERIMENTAL ON-GOING WORK TO
BETTER QUANTIFY MARGINS. MARGINS ARE ANTICIPATED.
,TO INCREASE.
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