ML19207B978

LER 79-029/03L-0:on 790803,during Turbine Roll,Containment Particulate & Gaseous Monitor Was Rendered Inoperable.Caused by Blown Neutral Phase Fuse in Fuse Holder.Holder Was Jumpered & Control Power Restored.Replacement Is on Order

ML19207B978
Person / Time
Site:	Calvert Cliffs
Issue date:	08/31/1979
From:	Heibel R, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19207B976	List: ML19207B975 ML19207B978
References
LER-79-029-03L, LER-79-29-3L, NUDOCS 7909060266
Download: ML19207B978 (2)

Text

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- a EVENT DESCRfPTION AND PROBABLE CONSEQUENCES h ,

o.  ! Durina a turbine roll with the reactor at 3*. P'.B containment carticulate and  !

o ,3 l caseous monitor was rendered inocerable by a blown fuse. The plant start-uo l Ti'-] I was stopped and ocwer was reduced to hot standbv at 0750 (Mode 3). The carticulate 1 ois i a.vi casecus monitor system was returned to service at 0853 on 8/3/79. The contain- l 0,s I rrent sumo level alant remained in service throuchaut this event (T.S.3.4.6.1.). i o,7 i This is not a repetitive occurrence. I IO88 l  !

g g 50 SYS'EM CA US E CAUSE COM*. VALvf CCCE CODE. SueCCDE COM*CNENT CODE SUBCODE SveGODE Ol9l l l l l l l l f  !  ! l l l- l l l l f 7 8 9 10 11 12 13 18 1s 20 SE QUE NTIA L OCCU A AENCE REFOR7 REvtSION ENTVEAR AEP T CODE c q. AC .

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3J 34 35 3? 40 41 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i : o l l The initial cause of event was a blown neutral onase fuse for- the affected cabinet's I i3 l control cower. Durinn reclaterent, a fuse brcke in the holder. E# forts to rmeve a f

, - ,- I fuse end cao danaced the holder such that holder was shorted to around. Initial l 3,,3i [ correcdve action consisted of liftino field cables to isolate circuits cowered from 1 ,

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LER NO. 79-029/3L ,

DOCKET NO. 50-318 ~

EVENT DATE 08-03-79 _ _.

REPORT DATE 08-31-79 -

ST_.T.A_CHME NT CAUSE DESCR!? TION A?!D CORRECTIVE ACTIONS:

Uoon discovery of the damaced Mrse holder, the holder was jumpered and Contml Power was restored. A replacement holder is on order and will be installed wnen received. Maintenance Recuest 0-79-2353 is beine held oren for completion of repair.

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