ML18191A270

Wppss Nuclear Project No. 2. Main Steam Isolation Valve Leakage Control System

ML18191A270
Person / Time
Site:	Columbia
Issue date:	07/14/1976
From:	Renberger D Washington Public Power Supply System
To:	Vassallo D Office of Nuclear Reactor Regulation
References
G02-76-294
Download: ML18191A270 (4)

Text

NRC FORM 195 I2 76)U.S.NUCLL'AR REGULATORY COM N DOCKET NUMBER NRC D'ATTRIBUTION FDRiPART 50 DOCKET MATERIAL FILE NUMOER MR D B VASSALID BETTE R 0%0 G INAL OPY DESCRIPTION ONO ORIZED NCLASSIFIED PROP INPUT FORM ENCLOSURE FROM: WASHINGTON PUBLIC POWER SUPPL SYSTEMS RICHLAND'ASH D L RENBERGER DATE OF DOCUMENT l-l DATE RECEIVED z-ls-14 NUMBER OF COPIES RECEIVED I gi,'TR REF THEIR 10-21-75 LTR AND OUR 12-2-75 LTR~~~~.DISCUSSING MAIN STEAM ISOLATION VALVE LEMON.GE CONTROL SYSTEM@~~~~~~~~~~~Ziti 3.4 PLANT NA>IE:~q~qg+~.L SAFETY ASSXGNED AD: BRANCH CHIEF: PROJECT lfANAGER: LIC~ASSTo: LC I-Pe FOR ACTION/INFORMATION ASS NED A Pll0~C ElFIL 1&~R INTERNAL DISTRIBUTION SYSTEMS SAFETY HEINEMAN SITE 5~A ENVI 0 ANA S I&E OELD GOSSICK&STAFF NXPC CASE HANAUER SCHROEDER ENGINEERXNG iIACCARRY KNXGHT SIHMEIL PAWLICKI BENAROYA IPPOLXTO KXRIQJOOD OPERATIN REACTO S PROJECT NA EMEN BOYD P COLLINS HOUSTON PETERSON lIELTZ HELTEMES SKOVHOLT LPDR: TXC: NST ASLB: ACRS CYS HOLDING.EN REACTOR SAFE'EY ROSS NOVAK ROSZTOCZY CHF.CK AT&I SALTZMAN RUTBERG EXTERNAL DISTRIBUTION NAT LAB: REG, VIE LA PDR CONSULTANTS OPERATXN EISENH SHAD BAER BUTLER GRIEVES BROOKHAVEN ULRIKSON ORNL S A CONTROL NUMBER S~~~~~~~~~~~l Washington Public Power Supply System A JOINT OPERATING AGENCY P.O~BOX S68 3000 GEO.WASHINGTON WAY AIGHI.ANO, WASHINGTON 95352 PHON@(50&)

546 IS II (Docket No.50-397)July 14, 1976 G02-76-294 Director Of Nuclear Reactor Regulation U.S.Nuclear Regulatory Commission Washington, D.C.20555 Attention:

Mr.Domenic B.Vassallo Light Water Reactors Project Branch 4

Subject:

WPPSS NUCLEAR PROJECT NO.2 MAIN STEAM ISOLATION VALVE LEAKAGE CONTROL SYSTEM/.">>i++

References:

1)Letter, O.D;Parr to J.J.Stein entitled,"Main Steam Isolation Valve Leakage Contvol System," dated.November 21, 1975.(GI2-75-162) 2)Letter, N.O.Strand to O.D.Parr entitled, NMain Steam Isolation Valve Leakage Control System," dated December 2, 1975.(G02-75-329)

Dear Mr.Vassallo:

With regard to the referenced request.for a commitment to provide an interlock prohibiting depressurization of the main steamline if the inboard main steamline isolation valve fails to close, we have reviewed the feasibility of providing the desired interlock.

It appears the present switches on the inboard main'steamline isolation valves can be changed out for switches which can accommodate the desired interlock.

Therefore, we are proceeding on the basis the inteI"lock can be provided and are taking steps to modify the existing valves to accept tne interlock.

Very truly yours, g@k,A~.D.L.RENBERGER Assistant Director Generation and Technology DLR:GLG:mb cc: JJ Byrnes-B8R-FA MacLean-GE JJ Verderber-BSR D Roe-BPA crSIN P C 1 C~\I'0 1 I