ML19259D220

LER 79-050/03L-0:on 790924,reactor Exceeded License Limit of 2,700 Mwth.Caused by Operator Error.Power Was Reduced by Insertion of Control Element Assemblies.Operator Was Instructed of Importance of Maintaining Parameters

ML19259D220
Person / Time
Site:	Calvert Cliffs
Issue date:	10/11/1979
From:	Davis S BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19259D217	List: ML19259D216 ML19259D220
References
LER-79-050-03L, LER-79-50-3L, NUDOCS 7910170391
Download: ML19259D220 (2)

Text

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DATE i 8 60 61 DOCKET NUMB ER EVENT DETCRIPTION AND PROB ABLE CONSECUENCES h o 2 1 At 0600. the reactor exceeded the license limit of 2700 Mwth as printed out I o 3 l on the computer loo typewriter with a power of 2702 Mwth. The operator took l o 4 l imediate action and reduced reactor power to less than 2700 Mwth by 0605. I o s This is not a repetitive occurrence. I o 6 l l 0 7 I I I

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43 44 Z[9l9l9l@ 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l Upon investiaation, it was detemined that the coerator, realizino that the I i i l fnstantaneous reactor oower was hich, borated to reduce oower; however. this I

, 7 i action was not adequate. After realizina the averace hourly power exceeded I i 3 ] 2700 Mwth, the operator imediately reduced oower bv insertina Control Element I i A l Assemblies. I 7 8 9 80 5A  % PCWER OTHER STATUS ISCO RY DISCOVERY DESCRIPTION i s l El@ l l l 0 ; 0 l@l NA l lAl@l Ooerator Observation l A!riviTv CO TENT LOCATION CF RELEASE @

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LER NO. 79-050/03L EVENT DATE 09/24/79 REPORT DATE 10/11/79 DOCKET NO. 50-317 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

The ooerator involved was instructed as to the importance of maintaining oarameters within license limits. Since this is an isolated event, no further corrective action is deemed necessary.

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