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 U.S. NUCLL'AR REGULATORY COM N DOCKET NUMBER I2 76)

FILE NUMOER NRC D'ATTRIBUTION FDRiPART 50 DOCKET MATERIAL PUBLIC MR D B VASSALID FROM: WASHINGTON SYSTEMS RICHLAND'ASH POWER SUPPL l-l DATE OF DOCUMENT D L RENBERGER z- ls-14 DATE RECEIVED BETTE R ONO ORIZED PROP INPUT FORM NUMBER OF COPIES RECEIVED 0% 0 G INAL NCLASSIFIED OPY I gi,'TR DESCRIPTION ENCLOSURE REF THEIR 10-21-75 LTR AND OUR 12-2-75 LTR

~ ~ ~ ~ .DISCUSSING MAIN STEAM ISOLATION VALVE LEMON.GE CONTROL SYSTEM@ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

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.L SAFETY FOR ACTION/INFORMATION ASSXGNED AD: ASS NED A BRANCH CHIEF:

PROJECT lfANAGER: Pll0 LIC ~ ASSTo: LC ~ C INTERNAL DISTRIBUTION El FIL SYSTEMS SAFETY SITE 5~A 1&~R HEINEMAN ENVI 0 ANA S I& E SCHROEDER BENAROYA OELD GOSSICK & STAFF ENGINEERXNG IPPOLXTO NXPC iIACCARRY KXRIQJOOD CASE KNXGHT HANAUER SIHMEIL OPERATIN GRIEVES REACTO S PAWLICKI PROJECT NA EMEN REACTOR SAFE'EY OPERATXN BOYD ROSS EISENH P COLLINS NOVAK SHAD HOUSTON ROSZTOCZY BAER PETERSON CHF.CK BUTLER S A lIELTZ HELTEMES AT&I SKOVHOLT SALTZMAN RUTBERG EXTERNAL DISTRIBUTION CONTROL NUMBER LPDR: NAT LAB: BROOKHAVEN TXC: REG, VIE ULRIKSON ORNL NST LA PDR ASLB: CONSULTANTS ACRS CYS HOLDING . EN

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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

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Light Water Reactors Project Branch 4 i++

Subject:

WPPSS NUCLEAR PROJECT NO. 2 MAIN STEAM ISOLATION VALVE LEAKAGE CONTROL SYSTEM

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 inboard main steamline isolation valve fails to close, we have reviewed if the 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 crSIN P DLR:GLG:mb C cc: JJ Byrnes - B8R-FA MacLean - GE JJ Verderber - BSR D Roe - BPA

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