IR 05000397/1998020

Confirms Extension Until 981218,for Responding to Apparent Violation Identified in Insp Rept 50-397/98-20 & NOV Dtd 981016.Extension Allows Util to Provide Final Design Mod Description & Schedule for Implementation

ML17284A809
Person / Time
Site:	Columbia
Issue date:	11/12/1998
From:	COLEMAN D W WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
50-397-98-20, GO2-98-195, NUDOCS 9811180243
Download: ML17284A809 (4)

Text

CATEGORY ly REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)ACCESSION NBR:9811180243 DOC.DATE: 98/11/12 NOTARIZED:

NO DOCKET FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH.NAME AUTHOR AFFILIATION COLEMAN,D.W.

Washington Public Power Supply System RECIP.NAME

.RECIPIENT AFFILIATION Records Management Branch (Document Control Desk)SUBJECT: Confirms extension until 981218,for responding to apparent violation noted identified in NRC insp rept 50-397/98-20.

Phase one implementation will allow to place running main fire pump in standby status.DISTRIBUTION CODE: IE01D COPIES RECEIVED:LTR

, ENCL SIZE: TITLE: General (50 Dkt)-Insp Rept/Notice of Violation Response NOTES: E RECIPIENT ID CODE/NAME PD4-2 PD INTERNAL: ACRS AEOD/TTC ENT NRR/DRPM/PECB NUDOCS-ABSTRACT OGC/HDS3 EXTERNAL: LITCO BRYCE,J H NRC PDR COPIES LTTR ENCL 1 1 2 2 1 1 1 1 1'1 1 1'1 1 1 1 RECIPIENT ID CODE/NAME POSLUSNY,C AEOD/S PD/RAB DEDRO ERR/DRCH/HOHB NRR/DRPM/PERB OE DIR RGN4 FILE 01 NOAC NUDOCS FULLTEXT COPIES LTTR ENCL 1 1.1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 R D 0 NOTE TO ALT"RZDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTETH TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD)ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED: LTTR 19 ENCL 19 i

WASHINGTON PUBLIC POWER SUPPLY SYSTEM PO.Box 968~Richland, Washington 99352-0968 November 12, 1998 G02-98-195 Docket No.50-397 U.S.Nuclear Regulatory Commission Document Control Desk Washington, D.C.20555 Gentlemen:

Subject: References:

WNP-2, OPERATING LICENSE NPF-21, NRC INSPECTION REPORT 98-20, RESPONSE TO APPARENT VIOLATION EXTENSION REQUEST 1)Letter dated October 16, 1998, TP Gwynn (NRC)to JV Parrish (SS),"NRC Inspection Report 50-397/98-20 and Notice of Violation".2)Letter.dated July 16, 1998, EW Merschoff (NRC)to JV Parrish (SS),"NRC Augmented Inspection of WNP-2 (NRC Inspection Report 50-397/98-16)" The purpose of this letter is to confirm the extension until December 18, 1998 for responding to the apparent violation identified in Reference 1.The date was extended during telephone conversations between NRC, Region IV, and Supply System personnel.

,;at chai i i 802~goOogq7 qaiii2 Pop ADQCK p~8 The reason for the extension is that additional time is needed to complete our assessment of the fire protection system design modifications and the review of associated NFPA 20,"Standard for the Installation of Centrifugal Fire Pumps" requirements.

The multiple pump and multiple standpipe loop arrangement of the fire system resulted in significant hydraulic analysis complexity.

The development of an analytical model is now at a point where we are able to proceed with final engineering of the permanent design.Empirical evidence suggests that the non-compliances with NFPA requirements identified in Reference 1 associated with sequencing of pumps and the motor driven pump flow modulating valve design did not significantly contribute to the event's water hammer.However, detailed analysis is required to confirm this empirical data.We are also in the process of an extensive compliance review to the latest version of NFPA 2 RESPONSE TO APPARENT VIOLATION EXTENSION REQUEST'age 2 of 2 The Supply System recognizes the significance of the apparent violation.

We have determined that the root cause is a design deficiency that requires correction to preclude recurrence.

Accordingly, and as you are aware, we have taken short term interim actions or implemented compensatory measures to address the more significant design deficiencies until such time that a permanent design change can be implemented.

The interim actions and compensatory measures include:~strengthening the reactor building standpipe isolation valves~sustaining fire protection pressure with a continuously running main fire pump~establishing an air cushion at the top of reactor building standpipes to mitigate pressure surges~upgrading the trim design of the preaction and deluge valves to preclude sympathetic actuation on pressure transients

~enhancing operability testing for the motor driven pump modulating bypass valves to assure reliable performance

~performing a comprehensive system functional test to verify the effectiveness of these interim actions The design modifications are projected to be in two phases.The design part of the phase one effort is nearing completion.

Phase one completes the hydraulic analysis of the standpipe vacuum breaker design modification, installs the vacuum breakers, and instaUs a time delay in the diesel driven fire pump start logic to assure effective vacuum breaker response time.Phase one implementation will allow us to place the running main fire pump in standby status.Phase two is projected to replace the existing modulating bypass valves with standard relief valves and upgrade the motor driven fire pump controllers to a soft start design.This extension allows the Supply System to provide a final design modification description, a schedule for implementation, and identify and evaluate any other NFPA 20 code deviations.'his supplemental information will further assist the staff in its evaluation of the apparent violation during the enforcement deliberation effort.Should you have any questions or desire additional information regarding this matter, please call Mr.PJ Inserra at (509)377-4147.Respectfully, DW Coleman Manager, Regulatory Affairs Mail Drop PE20 cc: EW Merschoff-NRC RIV GA Pick-NRC.RIV C Poslusny, Jr.-NRR NRC Sr.Resident Inspector-927N DL Williams-BPA/1399 PD Robinson-Winston&Strawn