ML19290C278

LER 79-047/03L-0:on 791204,while Performing post-refueling Low Power Physics Test,Average Temp Dropped Below Tech Specs.Caused by Operator & Erratic Control of Turbine Bypass Valves

ML19290C278
Person / Time
Site:	Calvert Cliffs
Issue date:	01/04/1980
From:	Davis S BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19290C275	List: ML19290C274 ML19290C278
References
LER-79-047-03L, LER-79-47-3L, NUDOCS 8001100472
Download: ML19290C278 (1)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION

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• LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 7

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I 8 60 61 DOCKET NUMB EF 68 63 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES o 2 i At 1520 while performing a post refue ina low power physics test, Tave o 2 1 dronced below 515 F contrary to the recuirements of T.S. 3.1.1.5. The [

o 4 Operator immediately tripped the reactor and placed it in hot standby, l o s l since in his judoment Tave could not be restored to greater than 515 F l o 6 I within 15 minutes. LER 76-11 describes a similar event. 1 0 7 l l o H l l 7 8 9 80 SYSTEM CAUSE CAUSE COMP- VALVE CODE CODE SLBCODE COMPONENT CODE SUSCODE SUSCODE o 9 8 9 lRlCl@ W @

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35 36 3 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l The cause was due to the Ooerator overfeeding the steam qenerator and erratic l i i i control of the turbine bypass valves because of low steam flow. Since the i 2 I reactnr had a nneitivo tomrprattiro coefficient (PTC) the combined events I i a l caused Tave to ranidiv decrease. Since reactor oberation with a PTC is limited I i A I to brief neriods. no corrective action is deemed necessarv. I 7 3 9 80 STA S  % POWE R OTHER STATUS SCO RY DISCOVERY DESCRIPTION t s ( X_j@ l 0 0 l O l@ NA l l A l@l Ooerator Observation l ACTIVITY CO TENT RELE ASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE t 6 NA

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