ML17252B559

LER 79-052-00 for Dresden 2 Regarding an Incident Where Fire Water Accumulated on the Mezzanine Floor Which Then Ran Down Into the U2 D/G Control Cabinet Via the D/G Room Vent Ductwork, Causing the Diesel Auto Start Block Alarm

ML17252B559
Person / Time
Site:	Dresden
Issue date:	10/18/1979
From:	Commonwealth Edison Co
To:	NRC/RGN-III
References
LER 79-052-00
Download: ML17252B559 (1)

Text

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IDIJ !While performing a modification on the fire system, firewater accumulated on I~JI] .I the mezzanine floor which then ran down into the U2 D/G control cabinet via the D/G

~ I room vent **-ductwork, causing the diesel auto start block alarm. The operating engr.

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,..IT))] I declared the D/G inoperable and electrical maintenance was called upon to determine

• [QJI] ithe cause. The health and safety of the public was not affected because redundant

• rr:m I systems were verified operable by required testing. This event is the first. of its I*

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7 8 9 80 SYSTEM CAUSE *CAUSE COMP. VALVE

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4J I44GI 0 I .8 I 047' CAUSE DESCRIPTION AND CORRECTIVE ACTIONS o::I£J I Water in controi cabinet shorted the auto start relay contact causing auto start o:IIJ block alarm. The water was removed and the cabinet dried. Required surveillance was completed satisfactorily and the D/G demonstrated operable. The seams between

• o:::DJ I ceiling and U2 & U3 DG room vent. ductwork which penetrates the ceiling,* have been I.

o::::r:rJ f sealed with RTV to-prevent recurrence.

• 7 8 9 80 FACILITY METHOD OF . t::':;\

STATUS*  % POWER OTHER STATUS DISCOVERY D_ISCOVERY DESCRIPTION ~

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TYPE DESCRIPTION ~

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. 80 PUBLICITY {.';:\ . NRC USE ON l Y ISSUED(.;'::;\ DESCRIPTION~ ~- * <<: . "'

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