ML20154C746

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Responds to IE Bulletin 85-003, Motor-Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings
ML20154C746
Person / Time
Site: Limerick  Constellation icon.png
Issue date: 09/12/1988
From: Kowalski S
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: Wenzinger E
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-85-003, IEB-85-3, NUDOCS 8809150002
Download: ML20154C746 (2)


Text

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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BOX 8699 PHILADELPHI A, PA.19101 lais)esi4 son

s. s. Nowai.sk

.,7.5$NI.*,3l.,!. September 12, 1988 Mr. Edward C. Wenzinger, Chief Docket No.: 50-352 Projects Branch No. 2 50-353 Division of Reactor Projects UStRC Region 1 ATTH: Docurent Control Desk Mall Station P1-137 Washington, DC 20555

Subject:

1.E. Bulletin 85-03 "Motor-operated Valve Cmnon Mode Failures During Plant Transients Due to inproper Switch Settings" Limerick Generating Station Units 1 & 2

References:

(1) S. J. Kcwalski (PECo) letter to E. C. Wenzinger (PRC),

dated May 27, 1988 (2) E. C. Wenzinger (NRC) letter to J. S. Kenper (PEco),

dated March 29, 1988 (3) J. S. Keviper (PEco) letter to W. T. Russell (NRC),

dated Novenber 17, 1987 (4) 1.E. Bulletin 85-03 Supplement 1, dated Aprl) 27, 1988 (5) 1.E. Bulletin 85-03, dated Novmber 15, 1985

Dear Mr. Wenzinger:

The purpose of this letter is three fold. First, it serves to advise you that the previous Information submitted b/ References (1) and (3) is directly appilcable to Limerick Unit 2. Seccrid, it provides a update of the design basis differential pressure information to address I.E. Bulletin 85-03, Supplement 1. Last, it provides an estimated schedule for the ccurpletion of the currently defined I.E.

Bulletin 85-03 field activities at Limerick Unit 2. With this letter, PECo considers 1.E. Bulletin 85-03 closed at Limerick Unit 2.

Limerick Unit 1 Suttnittal Applicability Reference (1) provided the Limerick Unit 1 response to the tRC Request for Additional Infonmtlen (RAI) made by Reference (2).

Reference (3) provided the final Limerick Unit I report required by 1.E. Bulletin action item (f). With the exception of the Limerick Unit 1 test results found in Reference (3), the infonnation contained in these sutunittals is directly appilcable to Linwrick Unit 2 and should be considered as part of our Limerick Unit 2 1.E. Bulletin 85-03 response. //

p 8809150002 88091}3ADOCN gDR PDC 05o0o 32 g

I.E. Bulletin 85-03 Supp1mmnt 1 Update Subsequent to the Issuance of BWROG Report NEDC 31322 Supp. 1

, (June 20, 1988) which considers valves previously excluded by the BWROG, PECo reviewed the new recminended differential pressures (D-P) against those originally reported. This review revealed that in all cases, the newly calculated maxinsm differential pressures were less than those reported in Reference (3) .n forming the bases for the minIntm required torque switch settings. (Reference (3) Indicated that the higher uf the rnaxlntm calculated D-P or purchase spec. D-P would apply.) On the four FOVs ilsted bolcw, the calculated noxinsm differential pressures did increase but the resul'.ing values were still less than those originally specified:

Purchase F0V BWROG Max D-P Max D-P Spec.

ID Valve # (Ref. 3) (BWROG) _D-P IW-55-F004 HPCI-3 23 50 125 i

HV-55-F007 HPCI-8 1171 1357 1625 FN-49-F010 RCIC-3 22 50 125 i HV-49-F012 RCIC-8 1171 1175 1500 These changes did not result in any F0V switch setting adjustnents at either of the Limerick units.

Cmpletion of Linorick Unit 2 I.E. Bulletin 85-03 Activities The Linwrick program to establish, test and nulntain notor-operator switch settings is ideatical between Units 1 and 2. PECo has confirned the adequacy of this program by representative differential pressure testing at Lincrick Unit 1 (see Reference (3)). The only rmulning Unit 2 activity is the baseline FOVATS testing which is near ,

empl et i on. With all progrren elments in place, PECo considers the I.E.

Bulletin 85-03 and Supp1 ment I regulronents ccmpleted at Linwrick Unit 2.

r if you have any questions or require any additional Information regarding our 1.E. bulletin 85-03 progrtm, please do not hesitate to contact us.

1 i

Sincerely,'

1 [' >

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4 l .: % 1 t t TSN/pdOS038806 Ccspy to: Addressee R. J. Clark, USNRC Project Manager LGS Resident Site Inspectors, Units 1 and 2 f.RC Divisim of Operational Events Assessnent NRC, Docw ent Control Desk l Washingten, DC 20555 I