· 2020. 2. 7. · .. ~ fue . ' c nse3 northern states power company m i n n e a p o l.l a ....

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. . ~ Fue . ' c NSE3 NORTHERN STATES POWER COMPANY M I N N E A P O L.l a . M I N N E S OT A 89401 / /.g ' , . * ' ' /- > October 17, 1973 D / '- St p ni '' < ' oJ f & "'||L*;[Omt h \ y *i ' ')/4 | \ \g\g n "*ym ,. '% Mr. D J Skovholt W QCl19 - Assistant Director for gGM g 'b It p Operating Reactors Yh M Office of Regulation # U S Atomic Energy Cceraission to C Washington, D C 20545 Dear Mr. Skovholt: M0tlTICELLO NUCLEAR CENERATING PIANT * Docket No. 50-263 License No. DPR-22 Response to September 5, 1973 Letter Concerning Inverted Control Rod Poison Tubes Your September 5, 1973 letter requested that we submit information concerning possible inverted control rod poison tubes. Our response to each of the six areas questioned is as follows. , 1. Analyses of possible length and location of poison voids which could be caused by boron carbide redistribution. Response lhe Monticello control blades are similar in design and construc- tion to the Millstone blades discussed extensively in a July 23, , 1973 report entitled, " Millstone Nuclear Power Station Unit 1, Reactor Control Blade Evaluation." Information regarding the g mechanism and limitation of boron carbide redistribution is equally applicable to Monticello. Additional information is provided in the General Electric response, dated October 8, 1973, to ten AEC questions on the subject of inverted poison tubes. The Monticello complement of control blades in the reactor consists of 26 blades fabricated in Wilmington from January 25, 1969 to Itarch 26, 1969 and 95 blades fabricated in San Jose. - Mechanical accelerations from scram, mechanical vibration during operation and thermal cycling are functions which could contribute 9102140371 731017 PDR ADOCK 00'',00263 P eDn 7713 < __ - - _ - - - - . )

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Page 1:  · 2020. 2. 7. · .. ~ Fue . ' c NSE3 NORTHERN STATES POWER COMPANY M I N N E A P O L.l a . M I N N E S OT A 89401 / /.g ' , . * ' ' /-> October 17, 1973 oJ D / '- St p ni

.

.~

Fue .

'

c NSE3NORTHERN STATES POWER COMPANY

M I N N E A P O L.l a . M I N N E S OT A 89401

//.g ' , . * ' ' /->

October 17, 1973 D / '- St p ni '' < 'oJf

& "'||L*;[Omt h\y *i '

')/4 | \ \g\g

n"*ym,.

'%Mr. D J Skovholt W QCl19-

Assistant Director for gGM g 'b ItpOperating Reactors Yh MOffice of Regulation

#U S Atomic Energy Cceraission toCWashington, D C 20545

Dear Mr. Skovholt:

M0tlTICELLO NUCLEAR CENERATING PIANT*

Docket No. 50-263 License No. DPR-22

Response to September 5, 1973 LetterConcerning Inverted Control Rod Poison Tubes

Your September 5, 1973 letter requested that we submit information concerningpossible inverted control rod poison tubes. Our response to each of the sixareas questioned is as follows.,

1. Analyses of possible length and location of poison voids whichcould be caused by boron carbide redistribution.

Response

lhe Monticello control blades are similar in design and construc-tion to the Millstone blades discussed extensively in a July 23,,

1973 report entitled, " Millstone Nuclear Power Station Unit 1,Reactor Control Blade Evaluation." Information regarding theg

mechanism and limitation of boron carbide redistribution is equallyapplicable to Monticello. Additional information is provided inthe General Electric response, dated October 8, 1973, to ten AECquestions on the subject of inverted poison tubes. The Monticellocomplement of control blades in the reactor consists of 26 bladesfabricated in Wilmington from January 25, 1969 to Itarch 26, 1969and 95 blades fabricated in San Jose.-

Mechanical accelerations from scram, mechanical vibration duringoperation and thermal cycling are functions which could contribute

9102140371 731017PDR ADOCK 00'',00263P eDn

7713< __ - - _ - - - - . )

Page 2:  · 2020. 2. 7. · .. ~ Fue . ' c NSE3 NORTHERN STATES POWER COMPANY M I N N E A P O L.l a . M I N N E S OT A 89401 / /.g ' , . * ' ' /-> October 17, 1973 oJ D / '- St p ni

_ _ _ _ _ _ - -

NO. HERN CTATEO POWER C APANY.

-2-,

to poison redistribution, if indeed one assumes Monticello rodblades are vulnerable to that phenomena. The Monticello reactorhas shown no evidence of boron carbide redistribution in theserods after 34 months of operation which includes 38 reactor scramsand 23 thermal cycles from cold shutdown to operating temperatures.We have done extensive tests of shutdown margins on all rods,observing absolutely no indication of encroachment on safety cri-teria. (See letter from Mr. L J Wachter to Mr. Boyce H Grier,

; " Response to July 26, 1973 Letter on Shutdown Margin Testing,"dated August 6, 1973.) Further, on several occasions we haveconducted critical tests at cold shutdown conditions in ways toascertain any significant conditions of reactivity asymmetry whichmay potentially develop between core quadrants or pic-shaped equalsections of the core and have observed no asymmetry indicative ofsignificant poison redistribution. These tests were particularlysensitive to the reactivity condition in the top of the core whersthe boron carbide redistribution is postulated to occur. (Seeletter from Mr. L 0 Mayer to Mr. J F O' Leary, " Supplemental Infor-mation to Cycle 2 Startup Report," dated August 9, 1973.) Whilethe conditions have existed wherein redistribution might be predictedif inverted tubes exist, there has been no measurable effect on thecore as would be anticipated from a significant amount of redistri-bution.

2. The effect of such redistribution on normal operation, transients,and accidents.

Response

This question is answered by the Galeral Electric report referencedabove.

3. Proposed changes to Technical Specifications which will assure thatall safety margins stated or implied in your FSAR are maintained.

Response,

We concur with the General Electric report in that no changes tothe Technical Specifications are required to preserve safety marginsfor the current cycle or af ter future reloads. The response to thisquestion in the General Electric report is based on the fact thatwe have performed shutdown margin tests on all control rods duringthe present cycle and is premised on the stated replacement criteriaof defective control blades for meeting shutdown margin requirementsfor future cycles. As explained in our response to the following

.

*% -

Page 3:  · 2020. 2. 7. · .. ~ Fue . ' c NSE3 NORTHERN STATES POWER COMPANY M I N N E A P O L.l a . M I N N E S OT A 89401 / /.g ' , . * ' ' /-> October 17, 1973 oJ D / '- St p ni

_ _ _ _ _ _ .

NOR, (ERN CTATEO POWER CC DANY

-3-

question, we may choose the option of performing shutdown margintests in lieu of blade replacements during future outages. Ineither of these alternatives, we see no need for Technical Speci-fication changes.

4. Surveillance requirements to maintain adequate shutdown reactivitymargins and monitor changes in poison distribution.

Response

in response to question 1 we outlined the testing done to datewhich showed no indication of boron carbide redistribution in thepast. We are following the status of the eddy-current testingtechniques discussed in the General Electric report. If at the timeof our Spring, 1974 refueling outage the technique has been demon-strated to provide conclusive evidence of inverted poison tubes, weintend to cddy-current inspect each control blade in the reactor.We will perform the following surveillance tests at the beginningof each reload cycle until we have conclusive evidence that noinverted poison tubes exist in excess of the .0025 delta k acceptancecriteria discussed in the General Electric report:

a. verify a shutdown margin of .0025 delta k on all rod.s havinga calculated reload design shutdown margin less than .013delta k at the most reactive ttne in the subsequent cycle.

b. run cold critical quadrant symetry checks to verify symmetryas a check against any cluster settlement conditions.

5. Your plans and schedules for change out of control rods.

Response

We have no plans to change out control blades at the present time.We have a ibnf.ted number of spare control blades on site which areavailable for replacement. We believe that decisions on a replace-ment program should be based on:

a. the findings of an ia-servke non-destructive test showingthe number of inverted poison tubes relative to the .0025delta k acceptance criteria,

b. evidence from the shutdown r.argin tests and symmetry tests thatpoison redistribution has indeed occurred, and

c. evidence f rom laboratory tests or from the inspection of exposedcontrol blades that significant poison redistribution can occur.

I

l,

__ _ _ _ _ . _ _ _ _ _ _ _ . _

Page 4:  · 2020. 2. 7. · .. ~ Fue . ' c NSE3 NORTHERN STATES POWER COMPANY M I N N E A P O L.l a . M I N N E S OT A 89401 / /.g ' , . * ' ' /-> October 17, 1973 oJ D / '- St p ni

NOR 4ERN OTATED POWER CC PANY.

4

1

.

!6. Expected curve of reactivity vs. burnup for the remainder of currentoperating cycle.

2 Respoase

The attached curve shows the shutdown margin with the strongest controlrod fully withdrawn for the entire Monticello cycle 2. The present

exposure in this cycle is approximately 2000 WD/T.,

Yours very truly,

04L 0 Mayer, PEDir ctor of Nuclear Su port Services

Lab /MHV/br

cc: J G KepplerG CharnoffMinnesota Follution Control Agency

Attn Ken Dzugan

e

Page 5:  · 2020. 2. 7. · .. ~ Fue . ' c NSE3 NORTHERN STATES POWER COMPANY M I N N E A P O L.l a . M I N N E S OT A 89401 / /.g ' , . * ' ' /-> October 17, 1973 oJ D / '- St p ni

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Page 6:  · 2020. 2. 7. · .. ~ Fue . ' c NSE3 NORTHERN STATES POWER COMPANY M I N N E A P O L.l a . M I N N E S OT A 89401 / /.g ' , . * ' ' /-> October 17, 1973 oJ D / '- St p ni

__________ _____

AEC DI 71B11T10N FOR PANT 50 DOCKET MAm7 AL(TiliPORARY FORM) CONTROL 1:0: 7713,

' FILE:

FR06: DATF OF DOC DATE REC'D LTR !!EMO RPT OTHERNorthern States Power CompanyMinneapolis, Minnesota 55401

|L. O. Mayer, PE 10-17-73 10-19-73 X,_

TO: ORIG CC OTilER SENT AEC PDR X

Mr. Skovholt No Orig SENT LOCAL PDR X

CLASS UNCLASS PROP INFO IUPUT NO CYS REC'D DOCKET NO:;

XX 49 | 50-263DESCRIt' TION : ENCLOSURES:Ltr our 9-5-73 ltr....concerning invertedControl Rod Poison Tubes........

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Do Not RemovcPLANT NAME: Monticello

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FOR ACTION /INF0DiATION 10-23-73 AB,

BUTLER (L) SClh'ENCER(L) M IEMANN(L) REGAN(E)W/ Copies W/ Copies W/9 Copies W/ CopiesCLARK (L) STOLZ(L) DICKER (F.)W/ Copies W/ Copies W/ Copies W/ CopiesCOLLER(L) VASSALLO(L) KNIGHTON(E)W/ Copies W/ Copies W/ Copies W/ CopiesKNIEL(L) SCHEltEL(L) YOUNGBLOOD(E)W/ Copies W/ Ccpics W/ Copics W/ Copics

- 7 INTERNAL DISTRIBUTION-

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OCC, RO''A P-506A / SCHROEDER CA G LL d IGGS (L) SALTZMAN/hUNIZING/ STAFF / MACCARY KASTNER GEARIN (L)y CASE v KNIGHT BALLARD GOULBOURNE (L) PLANS

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IPPOLITO YOUNGBLOOD WADE (E)REG OPR_ y TEDESCO REGAN WILLIAMS (E)

/ FILE & REG 7CN(3) VLONG PROJECT LDR WILSON (L)MORRIS / LAINASSTEELE .e BENAROYA HARLESS

V01 THER 4 |

EXTERt AL DISTRIBUTION |(4A )

' 1 - LOCAL PDR Minnenoolis. Minn. 1

A'1 - DTIE(AEERNATHY) (1)(2)(10)-NATIONAL LAB'S 1-PDR-SAN /LA/NY#1 - NSIC(ECC1'XiAN) 1- R. S choonrak e r , GC , GT, D- 323 1-GER AIS LP.LLOUCl .,

1 - ASLB(YCRE/SAYRE/ l-W. PENNINGTON, nn E-201 GT BR00KRAVEN NAT. LAB '

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R. DIGGS ON 10-23-73 1-GERALD ULRIKSON...ORUL 1-RD. . MULLER. .F-309 G

- - _ _ - _ - - - - _ _ _