ML19276G924

LER 79-027/03L-0 on 790719:metrascope Position of Control Element Assemblies Was Lost.Caused by Faulty Metrascope Power Supply.Faulty Components Replaced,Setpoints Calibr & Alarms Cleared

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: ML19276G920 ML19276G924
References
LER-79-027-03L, LER-79-27-3L, NUDOCS 7908280626
Download: ML19276G924 (2)

Text

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NRC FORM 366 U.S. NUCLE AR REGULATORY COMMISSION (M 7 P'

• LICENSEE EVENT REPORT CONTROL BLOCK: l 1

l l l l l lh 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

. 7 o i 8 9 lM D l C l C l N l 14 LICENSEE CODE 1 @l15 0 ] O l - l 0 lLICENSE 0 0l0 NUMBER 0 l - l 0 l 0 l@l 4 1l1l1l1j@l 25 26 LICENSE TYPE JO l

57 CAT 58 l@

CON'T 7

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3g"c lLl@l0l5 0 0l0l3l1 60 61 768l@l690 l 7EVENTl 1 lOATE 9l7 9 ]@l0 l 8 1l7l7 9l@

74 75 REPORT DATE 80 OOCKET NUMBER EVENT DESCRIPTION AND pro 8A8LE CONSEQUENCES O'o I

O 2 l At 2245 on 7/19/79 during post refueling startup testing, CEA motion inhibit and I io 3 l secondary power dependent insertion alanns were received as a result of losing l 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 i

3 gGroup 5. The CEA drive system was maintained in manual mode with all CEA's fully 1 i o 3 [ withdrawn as required by T.S.3.1.3.1. Metrascope was returned to service at 1447 l l '

. o , lon 7/20/79. Similar events are described in LER's77-100 (U-1) and 78-30 (U-2). l 0 8 l

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i 'l$0E .!OOE SEs*CiSE COuPONENT CODE Su'BCODe Su1 E E O 9 lRjBl@ @ @ lE @ l I ] N l S l .T l R l U l@ [_C_j @ W @

7 8 9 to 11 12 13 18 19 20 L EVENT YE AR REP RT O C OE N .

O a'ER/ROyu[,E l2 19 l -l l0 l2 17 j/l 10 l3l [L l [-j [0_j

_. 2 % 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 l22A l g {34g lsZl@

a l36 Zl@ l 0] 0l 0l ai

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40 Jg di 42 N lg lN [g 42 l M l 2 ] 8 [ 5 lg 44 47 t

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O 1This event occurred shortly after reolacement of Metrascope PDIL Power Suonly due l i i l to capacitor C-5 of overlap card being fcund shorted. Various intearated circuit I

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

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

i 4 l 4 Multiplexer PC boards and the Grp. 4 PDIL PC board. Affected setpoints for (CONT) 1 7 8 9 80 STh  % POWE R OTHERSTATUS ISCOV R OISCOVERY OESCRIPTION i s [ B j@ l 1l 0l 0l@l NA l [ A l@l Ocerator Observation l AC TIVI TY CO TENT HELEASED OF RELE ASE AVOUNT OF ACTIVITY LOCATION OF RELE ASE i 6 Z g lZ lgl NA l l NA l PERSONNEL EXPOS ES NU*.9 E R TYPE D E SC RIP TI N

[~i 7 l0l0l0l@ g @l 1A l

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• s l3 l a8 9l l 0"l 0'l"0 l@l NA M :a l

7 11 12 80

'Si'E T ESCR? TON '' " O .

004 I79 i 9 lZ[gl NA ' C l 7 8 9 10 80 te su DE CRIPTION  %

12 l ol LU81 "A I IllilllillilII 7 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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2. REPORT DATE 08-17-79

.c 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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