ML19327B762

Ro:On 890920 & 25 Detectors for Detection Zones 1-16 & 1-16P & Zones 1-17 & 1-17P,respectively,taken Out of Svc Due to Precaution to Prevent Spurious Zone Fire Alarms.Fire Watch Patrol Established During Time Detectors Inoperable

ML19327B762
Person / Time
Site:	LaSalle
Issue date:	11/02/1989
From:	Diederich G COMMONWEALTH EDISON CO.
To:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 8911130094
Download: ML19327B762 (1)

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LESalle County Nuclear Station Rura1 Route #1, Box 220

.\ V Marseilles, Illinois 61341 -

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November 2, 1989 P410diff A3ulltG 1

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1 I' 'Mr. A. B. Davis

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i Region III Administrator MM l U. S. . Nuclear Regulatory Comunission 799 Roosevelt Road i ' Glen Ellyn, Illinois 60137

Dear Sir:

This special report.is subuitted in accordance with LaSalle Unit 1 Operating License, NPF-11, Appendix A. Technical Specification 3.3.7.9 and 6.6.C. F On September 20, 1989, the ionization detectors for detection zones 1-16 and l-16P (Reactor Building Primary containment 740' and 761') were taken out of service. Similarly, on September 25, 1989, the detectors for zones 1-17 and 1-17P (Reactor Building 740') were also taken out of service. These measures were taken as a conservative precaution to prevent spurious zone fire alarms due to extensive welding, cutting, and open flame work being performed in '

these areas. This work is required for the completion of the Unit i refueling outage.

In accordance with the Action Statement "a" of Technical Specification 3.3.7.9., an hourly fire watch patrol was established to inspect the affected fire detection zones during the time that the detectors are inoperable. ,

The ionization detectors have been inoperable in excess of the allowed fourteen (14)-days prior to requiring a Special Report because the work could .

r not.be completed within the specified time frame. These detectors will be returned to operable service upon completion of the current Unit I refueling outage currently scheduled for December 1989. ,

G. J. Diederich Station Manager LaSalle County Station GJD/GB/bjp xc: Nuclear Licensing Administrator NRC Resident Inspector NRC Document Control Desk INPO - Records Center 9,

8911130094 391102

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