ML20024G261

Application for Amend to License DPR-22,changing Tech Specs as Result of Reanalysis of Pressure Transients for End of Cycle Fuel Exposures

ML20024G261
Person / Time
Site:	Monticello
Issue date:	09/13/1973
From:	Larken W NORTHERN STATES POWER CO.
To:
Shared Package
ML20024G258	List: ML20024G257 ML20024G261 ML20024G262
References
A00L-730913, AL-730913, NUDOCS 9102080439
Download: ML20024G261 (4)

Text

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'D N' AmtvW o,ttr gn ,[*/} - 7,3 UNITED E'ATES ATOMIC 1%ERGY CQ011SS105 NORTilERN STATES POWER COMPANY ,

Monticello Nuclear Concrating Plant Docket No. 50-263 it REQUESI FOR AUT110RIZAT10N OF g A CilANGE IN TECIC11 CAL SPECIFICATIONS 9 '

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(Chance Request Dated September 13, 1973) 4 L

m Northern States Power Company, a Minnesota corporation, requests >

authorization for changes to the Technical Specifications as shown on the attachments labeled Exhibit A and Exhibit B. Exhibit A describes the proposed changes along with reasons for change. Exhibit B is a

, copy of the Tcchnical Specificationr. revised to incorporate the pro-posed changes.

This request contains no restricted or other defense information.

NORTilERN STATES POWER COMPANY ny ,,,

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Wade Larkin Group Vice President - Power Supply 1

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On this / day of O G M h"', , 1973, before me a notary public in and for said County, personally appeared Wade Larkin, Group Vice President - Power Supply, and being first duly sworn acknowledged that he is avchorized to execute this document in behalf of Northern ,

States Powei Company, that he knows the contents thereof and that to the best of his knowledge, information and belief, the statements made in it are true and that it is not interposed for delay.

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EX1tIBIT A MONTICELLO NUCLEAR G12iERATING PLANT DOCrET No. 50-263 CllANGE REQUEST DATED SEPintBER 13, 1973 PROPOSED CllANCES TO TlIE TECilNICAL SPECIFICATIONS AP1'END1X A 0F PROVISIONAL OPERATING LICl2;SE NO. DPR-22 Pursuant to 10CFR50.59, the holders of the above-mentioned license hereby propose the following changes to Appendix A, Technical Specifications.

1. PROPOSED CllANGC On page 16, Bases: 2.1, first paragraph, fourth line, change

'(4,5)" t o read "(4,5,6,7 ) . "

On bottom of page 16, nC "(6) Supplen.ent on Transient Analyses submitted by NSP to the AEC, February 13, 1973" and "(7) Le t te r from NSP to AEC, ' Planned Reactor Operation From 2000 Mh'D/T to End of Cycle 2,' dated August 21, 1973."

REASON FOR CllANCI:

This will document in the Technical Specifications the additional studies completed on the ef fects of operational transients.

2. PROPOSED CIIANCE I

On page 20, Bases: 2.3.A, end of third paragraph, change " ....

page 22." to read " .... page 18."

On page 21, Bases : 2.3.B, end of second paragraph, change " ....

page 22." to read " .... page 18."

On page 21, Bases: 2.3. C, end of fourth paragraph, change " . . . .

page 22." to read " .... page 18."

On page 26, Bases: 2.4, third parai,raph, third and sixth lines, chan);c " . . . . page 22. " t o read " . . . . page 18 "

REASON FOR CllANCE These chanres correct typographical errors.

" i EX111g1T A 2

3. pi;Op051;D CilANGC

- On page 24, liases: 2.2, move the last paragraph to the top of page 25.

REAS(U FOR CilANCn To have all of this paragraph on the same page.

4. pHop0Sr0 CilANGC i l

On page 23. T.S.2.4.C, change "2 valves at $1210 psig " and "2 i valves at s 1220 psig." to read "4 valves at.4._.1260 psig." j

- On page 25,11ases : 2.2, in the second sentence, delete the words "f rom ra ted power. " In the third sentence, change " . . .. is 1183 psig." to read " .... is limited to 1214 psig." In the fif th sentence, change " .... to 1283 poig .... " to cad " .... to 1308 psig .... "

- on page 26, baset.: 2.4, second pa ragraph, line 8, change " ....

about 1283." to read " .... about 1308 poig." On line 10, change

" . . . . o f f ive valves (i safety valves and 3 dual purpose safety / )

relief valves) set . . . . " to read " . . . . of eigh t va lvu. (4 safety l valves and 4 dual purpoce safety / relief valves) set .... " l

- 9n page 110, T.S.3.6.1;.1, fourth line, change " .... three safety valves .... " to read " .... four safety valves .... "

- On page 119, T.S.4.6.E.1, last sentence, delete everything af ter

" . . . . nominal popping point of the .. . . " (including tabulation) and add " .... f our safety valves shall be set at 51240 psig "

On page 134, lases: 3.6.E/4.6.E, last paragraph, line 4, change

" .... to total 507. (357. relie f end 157. saf ety) of . . . . " to read

" . . . . to total 83.97. (t 77 relie f and 36.97, safety) of . . . . " on line 5, change " .... assuming that th'ce of the four relicI/ safety valves (357.) and tvo of the four safety valves (187.) operateJ." to read " . . . . assuuting that four safety / relief valves (477.) and four safety valves (36.9%) operated." Delete the last sentence of the paragraph.

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EX111DIT A

. l REASON FOR CHANGE I 1

The transients discussed in our February 13, 1973 submittal were reana- ,

lyzed as reported in our letter to the AEC entitled, " planned Reactor l Operation From 2000 MWD /T to the End of Cycle 2," dated August 21, '

1973. The reanalysis examines the effects of a change in the scram reactivity insertion rate which takes place with increasing exposure and results in higher peak pressures during transients. These changes to the Technical Specifications reficct the assumptions and results of_

the reanalysis plus additional analysis performed subsequently. One of the objectives of the analysis was to examine means of extending Cycle 2 operations at power levcis closer to rated after the limiting exposure threshold is reached. With the proposed increase in safety valve set-tings, the recocracnded 25 psi margin betwcon the transient peak is not compromised by a turbine trip without bypass with all rods out at 917.

of rated power. When the limiting exposure threshold is reached, con-trol rods will be maintained in a fixed pattern which will result in a power coastdown. The power coastdown will continue to the power thres- l hold (i.e. 917.) ,af ter which additional control rods can be withdrawn to maintain power no grectcr than 911,

5. PROPOSED CRANCE On pcge 85, Bases: 3.3.c/3.4.C, line 8, change the sentence beginning with "The limiting powc: transient .... " to read " The limiting operational transient is that resulting from a turbine stop valve closure with iailure of the turbine bypass system."

REASON FOR CilANCE This change restores the original statement erroneously changed in our Technical Specification Change Request Dated June 1, 1973. The MS1V closure with indirect scram is not an operational transient as defined in the FSAR since multiple failures are assumed to occur. The FGIV closure with indirect scram is studied only to satisfy code require-ments for cafety valve sizing.

6 PROPOSED CilAIE On page 134, bascr: 3.0 E/4.6.E, first paragraph, line 3, change

" ... 11% of design pressure." to read " ... 11% of the set pres su re.

REASON FOR CRANGE

.This change correctly states the pressure from which the tolerance band of the safety and scfety/ relief valves is determined.

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