05000336/LER-1982-017

LER 82-017/03L-0:on 820526,at 100% power,1800 Computer Processing Unit Declared Inoperable Because of Inability to Write Into Display Storage Address Register.Caused by Failure of Circuit Card.Card Replaced

ML20054J702
Person / Time
Site:	Millstone
Issue date:	06/18/1982
From:	Criscione J NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20054J700	List: 05000336/LER-1982-017, Forwards LER 82-017/03L-0
References
LER-82-017-03L, LER-82-17-3L, NUDOCS 8206290468
Download: ML20054J702 (1)

LER-2082-017,

Event date:
Report date:
3362082017R00 - NRC Website

text

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g l With the plant at 100 per cent power, the 1800 Computer Processina Unit was declared Oper-1 TO L noperable i because it would not write into the display storace address'reaister.

Power was r' educed l E l ations continued per TSAS 3-2.1 and 3.1.3.3.c for a 12_ hour peri ~i. _

@ l to monitor linear heat rate with the excore nuclear instruments, per Technical Specifi-l LER 77-41, 78-12, 78-21, 78-27, 79-05, 79-20, 80-08, l 7T] Lcation 4.2.1.2. Similar events:

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i i O j i The failure was traced to circuit card (P/N 5804627) in the 1800 process controller.

T'Til i The card was replaced, and the computer restored to normal operation within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. I I

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