05000317/LER-1979-027-03, /03L-0 on 790719:metrascope Position of Control Element Assemblies Was Lost.Caused by Faulty Metrascope Power Supply.Faulty Components Replaced,Setpoints Calibr & Alarms Cleared

/03L-0 on 790719:metrascope Position of Control Element Assemblies Was Lost.Caused by Faulty Metrascope Power Supply.Faulty Components Replaced,Setpoints Calibr & Alarms Cleared

ML19276G924
Person / Time
Site:	Calvert Cliffs
Issue date:	08/17/1979
From:	Heibel R, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19276G921	List: 05000317/LER-1979-027, Forwards LER 79-027/03L-0 05000317/LER-1979-027-03, /03L-0 on 790719:metrascope Position of Control Element Assemblies Was Lost.Caused by Faulty Metrascope Power Supply.Faulty Components Replaced,Setpoints Calibr & Alarms Cleared
References
LER-79-027-03L, LER-79-27-3L, NUDOCS 7908280626
Download: ML19276G924 (2)

LER-1979-027, /03L-0 on 790719:metrascope Position of Control Element Assemblies Was Lost.Caused by Faulty Metrascope Power Supply.Faulty Components Replaced,Setpoints Calibr & Alarms Cleared

Event date:
Report date:
3171979027R03 - NRC Website

text

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NRC FORM 366 U.S. NUCLE AR REGULATORY COMMISSION (M 7 P' LICENSEE EVENT REPORT CONTROL BLOCK: l l

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l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

lM D l C l C l N l 1 @l 0 ] O l - l 0 l 0 0l0 0 l - l 0 l 0 l@l 4 1l1l1l1j@l l

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7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T 3g"c lLl@l0l5 0 0l0l3l1 7 l@l 0 l 7 l 1 l 9 l 7 9 ]@l0 l 8 1l7l7 9l@

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7 8

60 61 OOCKET NUMBER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND pro 8A8LE CONSEQUENCES O'o I

l At 2245 on 7/19/79 during post refueling startup testing, CEA motion inhibit and I

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l secondary power dependent insertion alanns were received as a result of losing l

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g o i,i l metrascope position for four CEA's in GR-3, all CEA's in GR-4, and two CEA's in fa g roup 5.

The CEA drive system was maintained in manual mode with all CEA's fully 1

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[ withdrawn as required by T.S.3.1.3.1.

Metrascope was returned to service at 1447 l

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lon 7/20/79. Similar events are described in LER's77-100 (U-1) and 78-30 (U-2).

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lRjBl@ @ @ lE @ l I ] N l S l.T l R l U l@ [_C_j @ W @

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9 to 11 12 13 18 19 20 L

EVENT YE AR REP RT O C OE N.

O a'ER/ROl2 19 l

- l l0 l2 17 j/l 10 l3l [L l

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22 23 24 26 27 28 29 30 31 32 TAK N A T ON ON PL NT MET HOURS 22 S 8 i FO b 8.

SUPPLI E MANUFACTURER l A l g {34g lsZl@

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1This event occurred shortly after reolacement of Metrascope PDIL Power Suonly due l

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l to capacitor C-5 of overlap card being fcund shorted. Various intearated circuit I

i i l components were found to be failed as a result of the power supoly failure, result-l 7

ing in the indications above. Faulty IC components were replaced on the Grp.1 and I

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l 4 Multiplexer PC boards and the Grp. 4 PDIL PC board. Affected setpoints for (CONT) 1 i

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8 9 80 STh

% POWE R OTHERSTATUS ISCOV R OISCOVERY OESCRIPTION

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[ A l@l Ocerator Observation l

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AC TIVI TY CO TENT HELEASED OF RELE ASE AVOUNT OF ACTIVITY LOCATION OF RELE ASE Z g lZ lgl NA l

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PERSONNEL EXPOS ES NU*.9 E R TYPE D E SC RIP TI N l0l0l0l@ g @l 1A l

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l3 l a l l 0"l 0'l"0 l@l l

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8 9 11 12 80

'Si'E ESCR? TON '' " O.

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8 9 10 80 te su DE CRIPTION 12 l ol LU81 "A

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8 9 to 68 69 33 ;

N A?.'E OF PREP ARER PHON E -

7 9 0 8 2 8 06P c,

LER N0. 79-27/3L DOCKET N0. 50-317 EVENT DATE 07-19-79

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REPORT DATE 08-17-79 ATTACHMENT

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- 7915 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

(CONT)

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, py:.5 1'..i.E PDIL and PPDIL were calibrated and all alarms cleared.

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