ML20064E661

/03L-0 on 781024:plant Computer Malfunction Caused CEA Pulse Counting Position to Be in Oper.Cause of Computer Failure Could Not Be Traced

ML20064E661
Person / Time
Site:	Millstone
Issue date:	11/16/1978
From:	Stratman R NORTHEAST UTILITIES
To:
Shared Package
ML20064E659	List: ML20064E655 ML20064E661
References
LER-78-027-03L, LER-78-27-3L, NUDOCS 7811210275
Download: ML20064E661 (1)

Text

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n ,2 ; l During steady-state power operation, the plant computer experienced a malfunctior.

and was taken out of service. This resulted in CEA pulse counting position being g

,g,3, inoperable. In accordance with Technical Specification action statement 3.1.3.d. [

operation continued and the computer failure was corrected. The computer and the'CEA l pulse counting position indication system was restored to operable status within ,

2 1/2 hours. Similar events LER's 77-41/3L,'9/26/77; 78-12/3L, 6/27/78 and 78-21/3L, g p g, 9/26/78. , g OE CCDC $ 3CC 8 CO\'PONENT CODC susC Of SL E lol9l lI lF I@ l E l@ l Gl@ l Il Nl S l T I R l U lh IY l@ Llj @

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.CAUSE DESCntPTICN AND ConnEC.'VE ACTIONS h l i l uj i Tha caima nf tha e n-w a - faileirn could not be traced to a teacific en-nnnant. i li li j l With the 'conouter out of service. the linear heat rate surveillance wu mnnitnend I

_q l in accordance with Technical Specification 4.2.1.2 utilizino the excore detector

- I ii 131 l system. The comouter was restarted and norral operation was restored. I l

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