ML19208A803

LER 79-034/03L-0:on 790813,during Routine Surveillance Test, Control Element Assembly Deviation Exceeded 7.5 Inches Required to Initiate Assembly Motion Inhibit.Caused by Circuit Failing,W/High Conduction Affecting Other Failures

ML19208A803
Person / Time
Site:	Calvert Cliffs
Issue date:	09/13/1979
From:	Heibel R, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19208A801	List: ML19208A800 ML19208A803
References
LER-79-034-03L, LER-79-34-3L, NUDOCS 7909170509
Download: ML19208A803 (2)

Text

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EVENT DESCRIPTV.;N AND PROBA9LE CONSEQUENCES h oi2 At 0030 while performinc routine surveillance testinc, it was discovered that I o 3 [ Control Element Assembly deviation of greater than 7.5 inches was renuired to l Lo d I initiate CIA Motion Inhibit. The CEA drive syster was olaced in "off" and all I o s CEAs were fully withdrawn as recuired by T.S. 3.1.3.1 until corrective action I o e I was conoleted. CMI was restored on 8-21-79. Tnis is not a recetitive event. I o 7 l l 0ts 1 1 8 9 60 SYSTEM CAUSE CALSE COYP. LALVE COCE CCOE SL" CODE COYPONENT CODE SL9COCE SLBCOCE 7

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33 , 34 3 36 31 c l0 l0 l 40 41 y lg lN g 42 Nlg 43 44 Ml2l8[5lg 47 CAUSE DESCRIPTION AND CORRECTIVE ACTICNS h i o l Reclaced faulty CEA 14 coerational ar.plifier, CFA Grp. #4 Cut of Seouence circuit l l3 l3 j l A-25, and Deviation cutput circuits for Gros. A, B, C, 3, 4, and 5. Eit5er of the 1

,,, first two circuits, in failing with hich conduction, is believed to have effected I 3 l the failure of the other stages. The Deviation Outout Staces failed to conduct I 4 l sufficiently to initiate a CMI. I 8 9

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LER NO. 79-34/3L REPORT DATE 08-13-79 EVENT DATE 03-13-79 DOCKET fi0. 50-317 ATTACH':E!iT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

All circuits mentioned are in parallel power supply configuration. No preventive action is necessary.

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