05000317/LER-1979-034-03, /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

/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: 05000317/LER-1979-034, Forwards LER 79-034/03L-0 05000317/LER-1979-034-03, /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
References
LER-79-034-03L, LER-79-34-3L, NUDOCS 7909170509
Download: ML19208A803 (2)

LER-1979-034, /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

Event date:
Report date:
3171979034R03 - NRC Website

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9 60 61 DOCst ET NLYe gR 6d 69 E%ENT DATE 74 7$

HE PCHT OATE 30 EVENT DESCRIPTV.;N AND PROBA9LE CONSEQUENCES h oi2 At 0030 while performinc routine surveillance testinc, it was discovered that I

[ Control Element Assembly deviation of greater than 7.5 inches was renuired to l

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d I initiate CIA Motion Inhibit. The CEA drive syster was olaced in "off" and all I

Lo CEAs were fully withdrawn as recuired by T.S. 3.1.3.1 until corrective action I

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I was conoleted. CMI was restored on 8-21-79. Tnis is not a recetitive event.

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CAUSE

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9 10 11 12 13 18 19 20 SE OLEN TI AL OCCUDDENCE REFCRT REVISION LER RO EVENTYEAR NEPORT NO COOE TYPE NO.

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.6 27 28 29 30 31 32 ACTION FUTUAE EFFECT SwyTDOWN ATT ACsYENT NPA04 Pa.YE CDYP, CCVPONENT TAKEN ACTiCN CN PL ANT VETHOO HOLAS SLSYsTTED F ORV sLB.

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36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTICNS h l Reclaced faulty CEA 14 coerational ar.plifier, CFA Grp. #4 Cut of Seouence circuit l

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l3 l3 j l A-25, and Deviation cutput circuits for Gros. A, B, C, 3, 4, and 5.

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first two circuits, in failing with hich conduction, is believed to have effected I

l the failure of the other stages.

The Deviation Outout Staces failed to conduct I

3 l sufficiently to initiate a CMI.

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7 8 9 90 STANS N poi.T R OTwE R S Ta rt,l5 O SCO RY DISCOS E RY OESCR'PT'ON

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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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