05000318/LER-1979-035-03, /03L-0:on 790922,plant Computer Failed.Caused by Printed Circuit Board Failure Which Generated Rapid Access Data Storage Disc Stop Signal.Circuit Board Replaced

/03L-0:on 790922,plant Computer Failed.Caused by Printed Circuit Board Failure Which Generated Rapid Access Data Storage Disc Stop Signal.Circuit Board Replaced

ML19209C860
Person / Time
Site:	Calvert Cliffs
Issue date:	10/09/1979
From:	Davis S, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209C846	List: 05000318/LER-1979-035, Forwards LER 79-035/03L-0 05000318/LER-1979-035-03, /03L-0:on 790922,plant Computer Failed.Caused by Printed Circuit Board Failure Which Generated Rapid Access Data Storage Disc Stop Signal.Circuit Board Replaced
References
LER-79-035-03L-01, LER-79-35-3L-1, NUDOCS 7910180383
Download: ML19209C860 (1)

LER-1979-035, /03L-0:on 790922,plant Computer Failed.Caused by Printed Circuit Board Failure Which Generated Rapid Access Data Storage Disc Stop Signal.Circuit Board Replaced

Event date:
Report date:
3181979035R03 - NRC Website

text

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• LICENSEE EVENT REPORT CONTROL SLoCK: 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 Ol' S$RCE ll l@ 0 l 5 1010 101311 18 l@lo 19 12 12 17 lo l@l1 lo in lo 17 lo @

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60 61 DOCKET NUMBER 68 69 EVENT O ATE 74 75 RE8CRT DATE 80 EVENT DESCRIPTION AND pro 8 ABLE CONSEQUENCES h a

2 At 1515 the olant operator noticed that the olant comouter had failed.

I

The computer was declared inoperable per T.S. 3.3.3.2.

The excore

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l Nuclear instrumentation system remained ooerable durino the event. The I

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ois lcomouter was returned to service at 1950.

This has not been a recetitive 1

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9 10 11 12 13 18 19 20 S EQUENTI AL OCCURRENCE REPORT

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33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS lCorouter failure was due to.a orinted circuit board (Zerox No. MT 56) 1 i

o Ifailure which cenerated a RAD (Raoid Access Data) Storace disc "stoo" l

3 l signal. This board and one additional board (Zerox No. WT 57) which I

2 i-l failed were reolaced. Both boards are cart of the RAD Motor Control I

l Circuit. No oreventive action is reauired.

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% POWER OTHE R STATLS SO RY DISCOVERY OESCRIPTION l E l@ l 110 l Ol@l N/A l

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ACTIVITY C TENT AvouNT Cr 4CTiviTY @

LOCATION CF RELEASE

= ELE 4SEo or asLEASE 1 le IZ l @ l Zi@ l N/A [3/A l

6 3 10 11 44 45 80 8ERSONNEL EXPCSURES NUY9ER TYPE DESCRIPTICN i71 10 10 10 l@l Z l@l N/A I

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NRC USE ONLY

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3 S. M. Davis /P. G. Rizzo Puoys (in117'a 7047/7004:

2, NAME OF PAERARER