05000317/LER-1980-012-03, /03L-0:on 800211,while Performing Routine Surveillance Test,Control Element Assembly (CEA) 35 Dropped Into Core.Cause Unknown.Technician Will Be Assigned to Monitor Operating Parameter of All CEAs During Next STP

/03L-0:on 800211,while Performing Routine Surveillance Test,Control Element Assembly (CEA) 35 Dropped Into Core.Cause Unknown.Technician Will Be Assigned to Monitor Operating Parameter of All CEAs During Next STP

ML19294B759
Person / Time
Site:	Calvert Cliffs
Issue date:	03/03/1980
From:	Bauer E, Davis S BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19294B754	List: 05000317/LER-1980-012, Forwards LER 80-012/03L-0 05000317/LER-1980-012-03, /03L-0:on 800211,while Performing Routine Surveillance Test,Control Element Assembly (CEA) 35 Dropped Into Core.Cause Unknown.Technician Will Be Assigned to Monitor Operating Parameter of All CEAs During Next STP
References
LER-80-012-03L, LER-80-12-3L, NUDOCS 8003050476
Download: ML19294B759 (1)

LER-1980-012, /03L-0:on 800211,while Performing Routine Surveillance Test,Control Element Assembly (CEA) 35 Dropped Into Core.Cause Unknown.Technician Will Be Assigned to Monitor Operating Parameter of All CEAs During Next STP

Event date:
Report date:
3171980012R03 - NRC Website

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LICENSEE EVENT REPORT CONTROL BLOCK: l l

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60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h i At 2134 while perfoming a routine surveillance test, control element i

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I assembly (CEA) 35 dropped into the core (T.S. 3.1.3.1).

CEA-35 was I

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l withdrawn and leveled with its group at 2152. All other CEA's remained FO 4

i O I s 1 I operable during the event. The reactor was in Mode 2 at if, power during i

10lcI the event.

LER's 80-6 (U-1) and 80-9 (U-2) describe similar events.

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33 34 35 36 37 40 41 42 43 44 47 CAUSE L tCRIPTION AND CORRECTIVE ACTIONS lit is u. ':nown why CEA-35 dropped: the rod was raised by the operators I

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m1 18 minutes after it dropped.

It is planned during the next STP 0-29 i

I to have a technician monitor the operating parameter of all CEA's in i

2 l order to detect any intemittent problems and take corrective action.

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