05000324/LER-1981-057-03, During Computation of Containment Volumetric Average Air Temp,Temp of 135.57 F Was Revealed.Caused by Dust Accumulation in Cooler Air Louvres.Dust Was Removed & Air Flows Balanced

During Computation of Containment Volumetric Average Air Temp,Temp of 135.57 F Was Revealed.Caused by Dust Accumulation in Cooler Air Louvres.Dust Was Removed & Air Flows Balanced

ML20010J056
Person / Time
Site:	Brunswick
Issue date:	09/18/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010H969	List: 05000324/LER-1981-057, Forwards Updated LER 81-057/03L-1 05000324/LER-1981-057-03, During Computation of Containment Volumetric Average Air Temp,Temp of 135.57 F Was Revealed.Caused by Dust Accumulation in Cooler Air Louvres.Dust Was Removed & Air Flows Balanced
References
LER-81-057-03L-01, LER-81-57-3L-1, NUDOCS 8109290552
Download: ML20010J056 (2)

LER-1981-057, During Computation of Containment Volumetric Average Air Temp,Temp of 135.57 F Was Revealed.Caused by Dust Accumulation in Cooler Air Louvres.Dust Was Removed & Air Flows Balanced

Event date:
Report date:
3241981057R03 - NRC Website

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m NRC 50AM 36G U. S. NUCLE AR REGULATORY COMMtSSION (7 77). i,

.V-LICENSEE EVENT REPORT Update Report Previous Report Date 7-16-81 '

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8 M) 61 DOCKET NUYBER 68 69 EVENT DATE 74 76 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h d2j l During plant operacion operator computation of the primary containment volumetric l

l average air temperature, using the procedure outlined in PT 16.2, revealed a tempera-l [o i3; iol4ll ture of 135.57'F.

On July 8 and 15, 1981, performance of the PT revealed tempera-1 tures of 137*F and 135.79"F respectively.

In each of these cases, the average air l

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l temperature was reduced to < 135'F by lowering the temperature of RBCCW to the dry-l O 6 j o l 7 l l well air coolers. These events did not affect the health and safety of the public.

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33 34 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CJRRECTIVE ACTIONS h W l An inspection of the drywell air coolers revealed the cause of these events was a l

i l dust accumulation in the coolers' air louvres. The dust was removed. air flows and I

i i l RBCCW to the coolers were balanced and the coolers were returned to service. Plant l

, 2 g l modification 81-205, which installed air filters in the coolers, was completed as of l

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These f11ters will be inspected every refueling outage.

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LER A'ITACHMENT - RO #2-81-57 Facility: BSEP Unit No. 2 Event Date: 6-18-81 During the investigation of this event it was revealed that prior to the 'altial startup of Unit No. 2, an engineering change was implemented which removed.the existing air filters in the coolers' exhaust air ducts to facilitate the installation of turning vanes in the ducts.

Following this event, plant modification 81-205, to reinstall air filters in the coolers, was written and completed.

In addition, a plant. maintenance procedure is being developed to inspect these filters every refueling outage. A plant modification to install air filters in the drywell air coolers of Unit No. I will be developed for installation during the next refueling outage. The Unit No. I drywell oil coolers were cleaned, inspected and the flows balanced during the last' outage.

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