ML17289A330

Supplement to 920121 Application for Amend to License NPF-21 Changing TS Bases Section 3/4.6.1.4 Re Capacity of Blowers in MSIV Leakage Control Sys

ML17289A330
Person / Time
Site:	Columbia
Issue date:	02/14/1992
From:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17289A331	List: ML17289A330 ML17289A332
References
GO2-92-040, GO2-92-40, NUDOCS 9202240271
Download: ML17289A330 (7)

Text

ACCELERATED DISTRIBUTION DEMONSTE&TION SYSTEM REGULRT+ INFORMATION DISTRIBUTIOlISTEM (RIDE)

ACCESSION NBR:9202240271 DOC.DATE: 92/02/14 NOTARIZED: YES DOCKET FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH. NAME AUTHOR AFFILIATION SORENSEN,G.C. Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Supplement to 920121 application for amend to License NPF-21 changing TS Bases Section 3/4.6.1.4 re capacity of blowers in MSIV leakage control sys.

DISTRIBUTION CODE: ROOID COPIES RECEIVED:LTR i ENCL I SIZE: g +7 TITLE: OR Submittal: General Distribution NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 1 PD5 PD 1 1 ENG,P.L. 2 2 INTERNAL: ACRS 6 6 NRR/DET/ECMB 7D 1 1 NRR/DET/ESGB 1 1 NRR/DOEA/OTSB11 1 1 NRR/DST 8E2 1 1 NRR/DST/SELB 7E 1 1 NRR/DST/SICB8H7 1 1 NRR/DST/SRXB 8E 1 1 NUDOCS-ABSTRACT 1 1 O~CLF+B 1 0 OGC/HDS1 1 0 EG FILE Ol 1 1 RES/DSIR/EIB 1 1 EXTERNAL: NRC PDR 1 1 NSIC 1 1 NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WAS'ONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISIS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 24 ENCL 22

WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Box 968 ~ 3000 George Washington Way ~ Richland, Washington 99352 February 14, 1992 G02-92-040 Docket No. 50-397 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555

Subject:

WNP-2, OPERATING LICENSE NPF-21 REVISION TO BASES SECTION 3/4.6.1.4 OF THE TECHNICAL SPECIFICATIONS

References:

1) Letter, G02-92-015, dated January 21, 1991, GC Sorensen (SS) to NRC, "Request for Amendment to Technical Specification 4.6. 1.4 HSIV Leakage Control System"

2) Letter, G02-75-238, dated August 18, 1975, NO Strand (SS) to OD Parr (NRC), "Response to Request for Information Main Steam Isolation Valve Leakage Control System" Reference 1 requested a change to the Technical Specification Surveillance Requirement for the capacity of the blowers in the HSIV Leakage Control (HSLC)

System. This letter contains as an attachment a revision to the Bases of the Technical Specifications to support the requested amendment. The HSLC system was designed to divert potential leakage from the Hain Steam Isolation Valves (MSIV) to reduce untreated leakage from the valves when primary or secondary containment is required.

As discussed in References 1 and 2, the design capacity is required to be greater than 5 times the allowable Technical Specification leakage for the MSIVs.

Extensive modifications were initiated during R4 (1989) and completed in R5 (1990) on the eight HSIVs to reduce leakage. Leak testing on the HSIVs during the most recent outages has proven that valve modifications have significantly reduced measured leakage. No HSIV overhaul has been required because of leakage in excess of Technical Specification limits since the modifications were completed in R5 (1990).

9202240271 920214 PDR ADOCK 05000397 P PDR

'age Two REVISION TO BASES SECTION 3/4.6 OF THE TECHNICAL SPECIFICATIONS The blowers in the HSLC system take a suction on the piping downstream of the inboard and outboard HSIVs. The failure of an inboard HSIV to successfully isolate main steam line would result in excessive flow or high pressure in the corresponding line to the HSLC blower. The system is designed to isolate in this situation, preventing the need for the blowers to handle HSIV leakage signifi-cantly beyond allowable Technical Specification limits. The blowers also take a suction on the reactor building atmosphere. This is referred to as dilution flow. The combined flow (- 30 cfm) of HSIV leakage (( 3.8 scfm) and the dilution flow is directed to the SGT for processing. A portion of the flow diverted to the Standby Gas Treatment (SGT) System will be HSIV leakage, but the majority will always be dilution flow.

Sincerely, G. C. Sorensen, Hanager Regulatory Programs (Hail Drop 280)

MGE/bk Attachments CC: JB Hartin - NRC RV NS Reynolds - Winston & Strawn PL Eng - NRC DL Williams - BPA/399 NRC Site Inspector - 901A RG Waldo - EFSEC

STATE OF WASHINGTON)

Subject:

Revision to Bases Section 3 4.6. 1.4

)

COUNTY OF BENTON )

I. G. C. SORENSEN, being duly sworn, subscribe to and say that I am the Manager, Regulatory Programs, for the WASHINGTON PUBLIC POWER SUPPLY SYSTEM, the applicant herein; that I have the full authority to execute this oath; that I have reviewed the foregoing; and that to the best of my knowledge, information, and belief the statements made in it are true.

DATE / 1992 G. C. orensen, Manager Regulatory Programs On this date personally appeared before me G. C. SORENSEN, to me known to be the individual who executed the foregoing instrument, and acknowledged that he signed the same as his free act and deed for the uses and purposes herein mentioned.

GIVEN under my'and and seal this day of 1992.

No ary Public in and for the STATE OF WASHINGTON Residing at Kennewick Washin ton My Commission Expires A ril 28 1994

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