05000416/LER-1982-050-99, /99X-0:on 820806,early Indication by Fire Detection Sys Covering HPCS Diesel Generator Room & Fresh Air Corridor Progressed Into Alarm State & Would Not Clear. Caused by Dirt in Ionization Detectors.Detectors Cleaned

/99X-0:on 820806,early Indication by Fire Detection Sys Covering HPCS Diesel Generator Room & Fresh Air Corridor Progressed Into Alarm State & Would Not Clear. Caused by Dirt in Ionization Detectors.Detectors Cleaned

ML20027B367
Person / Time
Site:	Grand Gulf
Issue date:	09/13/1982
From:	Pace D MISSISSIPPI POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027B365	List: 05000416/LER-1982-050, Forwards LER 82-050/99X-0 05000416/LER-1982-050-99, /99X-0:on 820806,early Indication by Fire Detection Sys Covering HPCS Diesel Generator Room & Fresh Air Corridor Progressed Into Alarm State & Would Not Clear. Caused by Dirt in Ionization Detectors.Detectors Cleaned
References
LER-82-050-99X, LER-82-50-99X, NUDOCS 8209200318
Download: ML20027B367 (2)

LER-1982-050, /99X-0:on 820806,early Indication by Fire Detection Sys Covering HPCS Diesel Generator Room & Fresh Air Corridor Progressed Into Alarm State & Would Not Clear. Caused by Dirt in Ionization Detectors.Detectors Cleaned

Event date:
Report date:
4161982050R99 - NRC Website

text

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NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION Atta hment to AE N 82404

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LICENSEE EVENT REPORT Page 1 of 2 CONTROL BLOCK: l l

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60 61 DOCK ET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h Iol2l lEarly indication by the fire detection system covering the HPCS D/G room and fresh l

lo l3 ; l air corridor progressed into the alarm state and would not clear.

Investigation l

l o 14 l l revealed no fire or smoke in the area. This area is covered by an automatic fire l

10l51l Protection system, therefore, the only loss was early fire indication in the l

1o Is l l Control Room.

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li11I lalarm has been experienced previously in the construction and startup program and l

lil7) lwas always due to dust or particles on the ionization detectors. A Design Change l

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Attachment to AECM-82/404 Page 2 of 2 Supplementary Information to LER 82-050/99 X-0 Licensee:

Mississippi Power & Light Company Facility:

Grand Gulf Nuclear Station - Unit 1 Docket No.:

50-416 On August 6, 1982, the fire detection zone 2-10 went into an alarm condition and would not clear. A fire watch was established by operations.

This condition has been encountered several times since the system was placed into service.

Zone 2-10 includes the flame detectors in the HPCS D/G room and the ionization smoke detectors in the corridor between the D/G building and the Auxiliary building. Each time this zone has gone into an alarm condition and would not clear it was found that the ionization detector needed to be cleaned.

Investigation revealed that diesel exhaust fumes are drifting into the corridor and contaminating the ionization detector. For this reason a design change request has been submitted to change the ionization detectors to flame detectors which are not sensitive to dust or fumes. Upon completion of the change out, a followup report will be submitted.

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