ML20091G702

Special Rept:On 911112,14-day LCO on Fire Detection Instrumentation for Reactor Bldg Refuel Floor Expired.Lco Not Cancelled within 14-day Time Period Since Source of Spurious Alarms Could Not Be Determined.Sys to Be Replaced

ML20091G702
Person / Time
Site:	Brunswick
Issue date:	12/12/1991
From:	Spencer J CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9112180174
Download: ML20091G702 (1)

Text

. ..

q Cp&L Emmmastawintemummanzaams Carolina Power & Light Company un a n na n u u n . w r m s m as:n Brunswick Nuclear Project P. O. Box 10429 Southport, N.C. 28461-0429 December 12, 1991 FILE: B09-135100 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 BRUNSWICK STEAM ELECTRIC PiANT UNIT 2 DOCKET NO. 50 324 LICENSE NO. DFR.61 SPECIAL REPORT PER TECilNICAL SPECIFICATION 3.3.5.7 AND PURSUANT TO TECHNICAL SPECIFICATION 6.9.2 (2 SR-91 004.).

Centlemen:

This report is to inform you that a 14 day 1.5miting Condition for operation (LCO) expired November 12, 1991, on the fire detoction instrumentation for the Unit 2 Reactor Building refuel floor (117' olevation) . The LCO was initiated at 1830 on October 29, 1991, following spurious alarms on 1 or more of 34 ionization type fire detectors located on the 117' elevation. A firewatch has been stationed to monitor the area while the source of the alarm continues to be investigated. The LCO was not cancelled within the 14 day LCO period because the source of the spurious alarms could not be determined within this time period. _

It is believed the cause of the spurious alarms is due to the susceptibility of ionization type fire detectors to dust stirred up by refuel floor crane operation. I' nit 2 is in a refueling outage and the crano is in extensive use.

Identifying specific detector (s) causing the alarms is complicated by their location - SS' above the refueling floor. The Brunswick Nuclear ?roject has recognized that testing and repair of these dotectors can present a serious personnel hazard. Accordingly, plans to replace the existing system with devices which can be serviced more readily are in development. Implementation is now expected for June of 1993 on Unit 1, and December 1993 on Unit 2.

Very truly yours G &l J

..k . Spencer, Coniral Manager tudswick Nucle 'roj ec t ec: Mr. S. D. Ebneter Mr. N. B. Le BSEP NRC Resident Office ,

l f.121Ev174 011212 t h noc.cn 00000: 24 ers 1 h ,lg .

o