05000336/LER-1979-005-03, /03L-0 on 790218:malfunction in Computer Resulted in Control Element Assembly Pulse Counting Position Being Inoperable.Cause Traced to Circuit Card in Computer Memory; No Fault Discerned.Card Contacts Cleaned

/03L-0 on 790218:malfunction in Computer Resulted in Control Element Assembly Pulse Counting Position Being Inoperable.Cause Traced to Circuit Card in Computer Memory; No Fault Discerned.Card Contacts Cleaned

ML19274E484
Person / Time
Site:	Millstone
Issue date:	03/16/1979
From:	NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19274E483	List: 05000336/LER-1979-005, Forwards LER 79-005/03L-0 05000336/LER-1979-005-03, /03L-0 on 790218:malfunction in Computer Resulted in Control Element Assembly Pulse Counting Position Being Inoperable.Cause Traced to Circuit Card in Computer Memory; No Fault Discerned.Card Contacts Cleaned
References
LER-79-005-03L, LER-79-5-3L, NUDOCS 7903260246
Download: ML19274E484 (1)

LER-1979-005, /03L-0 on 790218:malfunction in Computer Resulted in Control Element Assembly Pulse Counting Position Being Inoperable.Cause Traced to Circuit Card in Computer Memory; No Fault Discerned.Card Contacts Cleaned

Event date:
Report date:
3361979005R03 - NRC Website

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[ During steady state power operation, the plant computer experienced a nalfunction g

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[TiITl [ and was taken out of service.

This resulted in CEA pulse counting position being g

[~oE l inoperable.

In accordance with Technical Specification action statcaent 3.1.3.d, l

HJ Loperation continued and the conputer failure was corrected. The conputer and the g

g,,) l CEA pulse counting indication system was restored to operable status within 5-1/2

[ hours.

Sinilar events LER's 77-41/3L, 9/26/77; 78-12/3L, 6/27/78; 78-21/3L, _

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The card contacts were cleaned and the g

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The conputer was restarted and normal operation restored.

l With the conputer out of service, the linear heat rate surveillance was nonitored in I

3 g accordance with Technical Specification 4.2.1.2 utilizing the excore detector systen. ;

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