05000000/LER-1986-004, Partially Deleted LER 86-004-01:on 860204,loss of Dynamic Reporting of Alarm Surveillance Occurred.Cause Withheld. Computer Svcs Personnel Will Continue to Monitor Sys for Indicators of Cause

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Partially Deleted LER 86-004-01:on 860204,loss of Dynamic Reporting of Alarm Surveillance Occurred.Cause Withheld. Computer Svcs Personnel Will Continue to Monitor Sys for Indicators of Cause
ML20238E709
Person / Time
Site: Millstone, 05000000
Issue date: 06/11/1986
From: Romberg W, Weekley P
NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To: Starostecki R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20238E403 List:
References
FOIA-87-410 LER-86-004-01, LER-86-4-1, MP-9170, NUDOCS 8709150150
Download: ML20238E709 (3)
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LER-2086-004, Partially Deleted LER 86-004-01:on 860204,loss of Dynamic Reporting of Alarm Surveillance Occurred.Cause Withheld. Computer Svcs Personnel Will Continue to Monitor Sys for Indicators of Cause
Event date:
Report date:
0002086004R00 - NRC Website
v • d • e

text

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I a,e,a-,,,,....-......-..-.,-o., l l On February 4, 1986 at a roximately 1234 hours0.0143 days <br />0.343 hours <br />0.00204 weeks <br />4.69537e-4 months <br />, th l

Both Unit 3 Security computers were halted and reb'ooted, but that di not correct the o Computer Services personnel restored th a roximately 1308 hours0.0151 days <br />0.363 hours <br />0.00216 weeks <br />4.97694e-4 months <br /> the erio en t e system malfunctioned compensator measures WILL I Al197-4,0 a ~,a PDR haC Fes* see

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0l1 0l2 0F 0l2 Identification Of Occurrence l l

Between 1234 hours0.0143 days <br />0.343 hours <br />0.00204 weeks <br />4.69537e-4 months <br /> and 1308 hours0.0151 days <br />0.363 hours <br />0.00216 weeks <br />4.97694e-4 months <br /> on February 4, 1986 the l l

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Effects Of Events l

1234 hours0.0143 days <br />0.343 hours <br />0.00204 weeks <br />4.69537e-4 months <br /> until 1308 hours0.0151 days <br />0.363 hours <br />0.00216 weeks <br />4.97694e-4 months <br /> on February 4, 1986 a temporary loss of dynamic reporting of alarm activity was experienced.

Description Of Compensatory Measures j

Designation Of Apparent Cause Corrective Action l

1. A installed.
2. During a reboot of the system pertinent data necessary to diagnose the v6s lost. Computer Services personnel will continue to monitor t or indicators as to the cause of the problem.

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i June 11, 1986 MP-9170 4 Docket No. 50-245  ;

Docket No. 50-336  ;

Docket No. 50-423 -

1 Mr. Richard W. Starostecki, Director Division of Project and hesident Programs NRC Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of frussia, Pennsylvania 19406

Dear Mr. Starostecki:

This letter forwards an updated report of a security related event pursuant to the requirements of 10CFR part 73, paragraph 73.7)(c).

Very truly yours, i

NORTHEAST NUCLEAR ENERGY COMPANY 0f Wayne D. Ro rg Station Super endent Millstone Nuclear Power Station WDR/LPB:mo

Attachment:

Report of Security Event 86-004-01 cc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission, Washington, D.C. 20555 T

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