ML20042A157

Forwards Request for Addl Info Re Operability of Containment Purge & Vent Valves

ML20042A157
Person / Time
Site:	LaSalle
Issue date:	03/12/1982
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	Delgeorge L COMMONWEALTH EDISON CO.
References
NUDOCS 8203230152
Download: ML20042A157 (3)

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l AFAR 121982 DISTRIBUTION:

. Docket File 50-373/374 LB#2 File m;

DEisenhut/RPurple Docket Nos. 50-373 RTedesco Aschwencer bcc: TERA and 50-374 3

ti RECEpjED ABournia NSIC

. EHylton NRC PDR 97 MAR 171982" 21 Woodhead, OELD L PDR L

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Mr. Louis 0. DelGeorge u mtGW,,3cm Region III Director of Nuclear Licensing g.a ppam p g

Commonwealth Edison Company s

Post Office Box 767

' q, SHanauer Chicago, Illinois 60690 g

RMattson ZRosztoczy HThompson GBagchi RVollmer MHaughey

Dear !!r. DelGeorge:

RHartfield, MPA FEltawila

Subject:

Request for Additional Information Concerning La Salle's Containment Purge / Vent Operation e

We reviewed your submittal dated November 4,1981 for the La Salle County Station, Units 1 and 2 concerning the operability of con-tainment purge and vent valves. As part of the review, we con-sidered your response as it applies to the NRC staff's, " Guidelines for Demonstration of Operability of Purge and Vent Valves."

As a result, we find that before we can complete our review additional infomation is necessary. The specific infomation is listed in the Enclosure.

If there are any questions concerning the enclosed additional informa-tion requested, please contact A. Bournia (301) 492-8196, the Licensing Project Manager.

Sincerely, A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing

Enclosure:

As stated

=The reporting end/or recordkeeping cc: See next page require:sents contained in this letter aff ect f o sor than ten respondants ;

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r203230152 820312 PDR ADOCK 05000373 DFFICIAL RECORD COPY usago 1981-.3JS-9CO Nec A

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i Mr. Louis 0. DelGeorge Director of. Nuclear Licensing Commonwealth Edison Company P. O. Box 767 Chicago, Illinois 60690 cc:

Philip P. Steptoe, Esquire Suite 4200 One First National Plaza Chicago, Illinois 606.03 Dean Hansell, Esquire Assistant Attorney General 188 West Randolph Street Suite 2315 Chicago, Illinois 60601 Roger Walker, Resident Inspector LaSall e NPS, U.S. N.R.C.

P. O. Box 224 Marseil-les, Illinois 61364 9

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ENCL CSURE Recuest for Additional Information La Salle County Station, Units T and 2 Containment Purge and Valve Operability

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.e 1.

Fisher recommends replacement of the EPT seats every 4 years.

( Attachment 9, Type 9200 Instruction Manual for maintenance recom-mendations).

Commonwealth Edison should confirm their intention to follow this schedule or propose an alternate replacement program.

2.

Commonwealth Edison's analysis is based on the 26 inch ourge valves a>itur c:ening cf EC' '90' is 'ui~

ccen).

the

Eing bictiec :: 2 analysis shoves ;*.e

.a'.<e 1: te arie :c ticse rE axir;r cceninc 3

cf50' Because cf operator limita:icns :ne valve cannct open bevend 40c against large cifferential pressure icading.

Verify the valve nas no safety-reittec function for wnicn it is recuired to be Opened against a large differential pressure.

3.

The Commonwealth Edison submittai contained information or, torcues determined from tes.ts of straight-line, uniform apprcach flow.

In the response prepared by Fisher for LaSaile, Fisher stated the opinion that non-uniform flow profile woulc not produce additional tcroue on the valve if the valve shaft is in ' plane with the plane of an upstream elbow or bend. The NRC staff agrees that the resulting torcues for this configuration will crobably be less severe than for e skaf cut-cf-:ian:, tu:

ric-te ma;ing a ;cdgemen c these salves additional infornation on :ne.rargins available in the stress analysis are recuired.

Fisher used alicwatie stress levels cf 1.55 for tensile 2-d TE5 f:

s ear 'S is ecual ic ' < -

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snea-and ce not include a targin Ccentnwea':n Eciscn sh: ult ceterrine Ine criticai parts for :nese valves and provide the margins against allowable stresses available under the maximum dynamic icads.

Tne basis for the allowable stresses should be indicated.

the valves it:2:sc dr.ns:-et-of E-e' ::.

'-" :te s ' a 't c u t-c '-

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' :-ns Pste< nas s:2.ec :te C t.- :<: - ~ s a##i t re :=r# r ance c ' ne valve.

Fitner nas nc: performed ests c dete-rine ine cuanti-tative ef fects cf the non-uniform ficw.

Sutri::Eis frca cther valve s e-ccr s ha ve '-di c a :e d :ki s ' st a

-- -- -:- - = ve c. g-1 'i-= ' e c

s on vaive torc;ues.

Based on the information submitted there are four valves affected by this concern:

IV00-29, 40, 34 and 42.

Commonwealth Edison should either procose additicnal tests for the elbow cut-of-ciane conficura-tien or mocify the valve instaliations c eli-inate this ccnfiguration ir trcer :: qualif3 these taltes.

DESIGNATED ORIGINAL Certified By

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