ML20137S628

Forwards Safety Evaluation Accepting Alternative Pipe Break Criteria to Eliminate Need to Consider Arbitrary Intermediate Pipe Breaks in High Energy Piping Sys.Fsar Section 3.6 Should Be Revised to Include Change

ML20137S628
Person / Time
Site:	LaSalle
Issue date:	09/27/1985
From:	Butler W Office of Nuclear Reactor Regulation
To:	Farrar D COMMONWEALTH EDISON CO.
Shared Package
ML20137S633	List: ML20137S628 ML20137S639
References
NUDOCS 8509300449
Download: ML20137S628 (3)

Text

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} 3EP 2 71985 Docket Nos. 50-373/374 Mr. Dennis L. Farrar '

Director of Licensing

-) Ccr rcrwealth Edison Company Post Office Box 767 l

Chicago, Illinois 60690

i.

Dear Mr. Farrar:

t.

SUBJECT:

ELIllIllATION OF ARBITRARY INTERMEDIATE PIPE CREAKS LA SALLE l COUNTY STATION, UNITS 1 AND 2 i

By letter dated April 30, 1985, Comonwealth Edison Company proposec alternative pipe break criteria that would eliminate the need to consider arbitrary interrediate pipe breaks in high energy piping systems at La Salle County Station, Units 1 and 2. Ve,have conpleted our review of your subulttal and the enclosed safety evaluation provides the results of the review.

I . Based on our review of ) cur justification for elimination of arbitrary intermediate breaks given in Attachments 0 through F to your submittal, we conclude that your request is acceptable for all systems identificd except that portion of the residual heat removal (RHR) system which is constructed

.with 304 stainless steel. This exception is needed because this material is susceptible to intergranular stress corrosion cracking. Only one arbitrary l

intermediate pipe break and one pipe whip restraint falls into this category '

from your subnittal. Your staf f was apprised of this tcsition during a

! teleccn on August 22, 1985.

In your submittal, you indicated that since all the pipe whip restraints i (associatec with arbitrary intermediate breaks proposed to be eliminated) are already in place, you plan to remove those that are determined not to be required as access time and ALARA considerations pemit during plant shutdown conditions.

i Ve concur with your plans in this regard and, in addition, find the deviation

. from Section 3.6.2 of the Standard Review Plan to be acceptable.

Ve request that in your next update of the Final Safety Analysis Report, ycu 4 revise Secticn 3.6 to include these changes to the postulated pipe break criteria.

Sincerely,

! 8509300449 e50927 *# #D

' llalter R. Butler, Chief PDR ADOCK 05000373

P PDR Licensing Branch No. 2

Division of Licensing i

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Enclosure:

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\*****,/ SEP 2 71985 Docket Nos. 50-373/374 Mr. Dennis L. Farrar Director of Licensing Corronwealth Edison Company Post Office Box 767 Chicago, Illinois 60690

SUBJECT:

ELIMINATION OF ARBITRARY INTERiiEDIATE PIPE BREAKS LA SALLE COUNTY STATION, UNITS 1 AND 2 By letter dated April 30, 1985, Connonwealth Edison Company proposed alternative pipe break criteria that would eliminate the need to consider arbitrary intermediate pipe breaks in high energy piping systems at La Salle County Station, Units 1 and 2. We have completed our review of your submittal and the enclosed safety evaluation provides the results of the review.

Based on our review of your justification for elimination of arbitrary intemediate breaks given in Attachments B through F to your submittal, we conclude that your request is acceptable for all systems identified except that portion of the residual heat removal (RHR) system which is constructed with 304 stainless steel. This exception is needed because this material is susceptible to intergranular stress corrosion cracking. Only one arbitrary intermediate pipe break and one pipe whip restraint falls into this category from your submittal. Your staff was apprised of this position during a telecon on August 22, 1985.

In your submittal, you indicated that since all the pipe whip restraints (associated with arbitrary intemediate breaks proposed to be eliminated) are already in place, you plan to remove those that are determined not to be required .

as access time and ALARA considerations permit during plant shutdown conditions.

We concur with your plans in this regard and, in addition, find the deviation from Section 3.6.2 of the Standard Review Plan to be acceptable.

We request that in your next update of the Final Safety Analysis Report, you revise Section 3.6 to include these changes to the postulated pipe break criteria.

Sincerely, Walter R. Butic , Chief Licensing Branch No. 2  :

Division of Licensing

Enclosure:

As stated ,

cc: See next page i

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- . =. . . - - . - - - - , - . . - - . .-

Mr. Dennis L. Farrar La Salle County fluclear Pcwer Station Comonwealth Edison Company Units 1 & 2

CC*

) Philip P. Steptoe, Esquire John W. McCaffrey Suite 4200 Chief, Public utilities Division One First National Plaza 160 lierth La Salle Street,' Room 900 Chicago, Illinois 60603 Chicago, Illinois 60601 t

I Assistant Attorney General 188 West Randolph Street Suite 2315 Chicago, Illinois 60601 2

Resident Inspector /LaSalle, NPS

, U.S. Nuclear Regulatory Commission 4

Rural Route No. 1 Post 0Ffice Box 224

- Marseilles . Illinois 61341 Chaiman La Salle County Board of Supervisors La Salle County Courthouse Ottawa, Illinois 61350 Attorney General 500 South 2nd Street j Springfield, Illinois 62701 I Chairman

Illinois Comerce Conenission

! Leland Building

527 East Capitol Avenue

Springfield, Illinois 62706

! Mr. Gary N. Wright, itanager i Nuclear Facility Safety l Illinois Department of Nuclear Safety -

l 1035 Outer Park Drive, 5th Floor Springfielo, Illinois 62704

Regional Administrator, Region III i U. S. Nuclear Regulatory Comission

, 799 Rossevelt Road Gle Ellyn, Illinois 60137 l

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