ML20024F607

Updated LER 82-050/99X-1:on 820806,Fire Detection Zone 2-10 Went Into Alarm Condition & Would Not Clear.Caused by Diesel Exhaust Fumes Drifting Into Corridor.Detectors Cleaned. Design Change submitted.W/830829 Ltr

ML20024F607
Person / Time
Site:	Grand Gulf
Issue date:	08/29/1983
From:	Byrd R, Dale L MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-83-0498, AECM-83-498, LER-82-050-99X, LER-82-50-99X, NUDOCS 8309090516
Download: ML20024F607 (4)

Text

NRC FORM 366 Update Report - Previous Report Date 9/13/83 UA m EAm m A w Commem a LK. EWE EVENT REPORT Attachment to AECM-83/04G8 Page 1 of 2

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su dB 80 7 8 80 EVENT DESCRIPTION Ase0 PROS A8LE CONSEQUENCES h ULj 2_j l hri v inefication bv the fire datmetion avstem coverino the HPCS D/G rooml 10131 l and fresh air corridor croorossed into the alarm state and would not j 10141 l el mar. Investication revealed no fire or smoke in the area. This area 1 o s lis covered by an automatic fire protection system, therefore, the only 1 10161 lLoss was early fire indication in the Control Room. This is a Special I fiiffl1Recort filed oursuant to Technical Specification 6.9.2. I 101811 I SOI>'E "^"o*E CO SueCOoE ConsPOssENT Coos sUeIOoE s7.E 7

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. AECM-83/0498 Page 2 of 2 SUPPLEMENTARY INFORMATION TO LER 82-050/99 X-1 Mississippi Power & Light Company Grand Gulf Nuclear Station - Unit 1 Docket No. 50-416 Technical Specification Involved: 3.3.7.9 Reported Under Technical Specification: 6.9.2 Event Narrative:

This is an update to a previous report submitted on September 13, 1982. The event for which the report was submitted is described in the following paragraph.

On August 6, 1982, 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 detectors. For this reason a design change (DCP 82/572) has been submitted to change the ionization detectors to flame detectors which are not sensitive to dust or fumes.

The change is expected to be implemented by the first refueling outage following commercial operation. This is submitted as a final report.

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MISSISSIPPI POWER & LIGHT COMPAl\ lye .. . i J

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Helping Build Mississippi a .. l mehMadds P. O. B O X 16 4 0, J A C K S O N, MISSISSIPPI 39205 ~ Cff",

August 29, 1983 08 ggp NUCLEAR PFIODUCTioN DEPARTMENT 4 ,

SS U. S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Regional Administrator

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-13 File 0260/L-835.0 Update Report - Smoke Detector Inoperability LER 82-050/99 X-1 AECM-83/0498 This letter submits an update to a previous report submitted on September 13, 1982. The event for which the report was submitted occurred on August 6, 1982, when the early fire detection system in the diesel generator room and fresh air corridor progressed into the alarm state and would not clear. No smoke or fire was revealed upon investigation. The event was reported pursuant to Technical Specification 6.9.2.

A Design Change has been submitted to replace these detectors with flame detectors which are not sensitive to dust or dirt. The change is expected to be implemented by the first refueling outage following commercial operation.

Attached is LER 82-050/99 X-1 which is a final report.

Yours truly,

./> 8 L. F. Dale Manager of Nuclear Services EBS/SHH: sap Attachment cc: (See Next Page ogytetM"h

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Member Middle South Utilities System

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AECM-83/0498

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. . MISSIE2iPPI POWER Q Ll2HT COMPANY cc: .Mr. J. B. Richard (w/a)

- Mr. R. B. McGehee (w/o)

Mr. T. B. Conner (w/o)

Mr. G. B. Taylor (w/o)

Mr. Richard C. DeYoung, Director (w/a)

. Office of Inspection & Enforcement U. S. Nuclear Regulatory Comission Washington, D. C. 20555 Document Control Desk (w/a)

' U. _ S. Nuclear Regulatory Comission Washington, D. C. 20555 I

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