ML20197B382

Agrees W/Util Interpretation to Leave Liquid Poison Sys Squib Primer & Trigger Assemblies in Svc Beyond Mfg Recommendation of 5 Yrs

ML20197B382
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	10/28/1986
From:	Zwolinski J Office of Nuclear Reactor Regulation
To:	Berry K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
TAC-62985, NUDOCS 8610300113
Download: ML20197B382 (2)

Text

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October 28, 1986 o

Docket No. 50-155 Mr. Kenneth W. Berry Director, Nuclear Licensing Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201

SUBJECT:

ENGINEERING EVALUATION OF SQUIB VALVE PRIMER AND TRIGGER ASSEMBLY INSERVICE DURATION (TAC 62985)

Re: Big Rock Point Plant By letter dated September 25, 1986, Consumers Power Cempany (CPC) provided NRC staff with a sumary of previous efforts and plans related to leaving the liquid Poison System squib primer and trigger assemblies in service beyond the manufacturers recomendation of 5 years.

In consideration of the temperature dependent degradation of the primer and triggerassemblies,theassurancethattheassemblieshaveremainedbelow 120 F because of continuous monitoring by thermocouples and a temperature recorder which alarns in the control room, and the manufacturer's written response documenting the 3 to 4 month useful life extension, NRC staff agrees with CPC's interpretation and plans to continue to operate until the January 1987 refueling outage.

NRC staff notes CPC's conservative interpretation of the 5-year service life of the primer and trigger assemblies in consideration of the Technical Specification 5.2.3 testing requirement of March 20, 1987.

Sincerely, j ohn A. Zwolinski, Director BWR Project Directorate #1

( Division of PWR Licensing cc: See next page 7 DISTRIBUTION:

EDocket File OGC-BETH (Info Only)

NRC & L PDRs" EJordan BWD#1 Rdg. BGrimes RBernero JPartlow TRotella NThompson CJamerson ACRS (10)

JZwolinski BRP file Gla s GHolahan DBL:BWD#1 DBL:BWD#1 0 #1)

CJamerson TRotell .ac (f Zwol ski 10/p/86 10/;6/86 10g86 8610300113 861028 PDR ADOCK 05000155 P PDR

4.

Mr. Kenneth W. Berry Consumers Power Company Big Rock Point Plant cc:

Mr. Thomas A. McNish, Secretary Consumers Power Company 21? West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Big Rock Point Plant ATTN: Mr. David P. Hoffman Plant Superintendent Route 3 Post Office Box 591 Charlevoix, Michigan 49720 Mr. I. Lee Moerland Chairman, Board of Commissioners P. O. Box 218 Charlevoix, Michigan 49720 Office of the Governor Room 1 - Capitol Building Lansing, Michigan 48913 Regional Administrator Nuclear Regulatory Commission, Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Nuclear Facilities and Environmental Monitoring Section Office Division of Radiological Health P. O. Box 30035 Lansing, Michigan 48909 Resident Inspector Big Rock Point Plant c/o U.S. NRC RR #3, Box 600 Charlevoix, Michigan 49720 w --