05000000/LER-1986-007, Partially Deleted LER 86-007-01:on 860218,loss of Alarm Surveillance Occurred.Caused by Water Leaking Into Cable Due to Heavy Rain.Cable Dried,Leak Repaired & Design Corrected

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Partially Deleted LER 86-007-01:on 860218,loss of Alarm Surveillance Occurred.Caused by Water Leaking Into Cable Due to Heavy Rain.Cable Dried,Leak Repaired & Design Corrected
ML20238E722
Person / Time
Site: Millstone, 05000000
Issue date: 10/06/1986
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-86-007, LER-86-7, MP-9581, NUDOCS 8709150159
Download: ML20238E722 (3)
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LER-2086-007, Partially Deleted LER 86-007-01:on 860218,loss of Alarm Surveillance Occurred.Caused by Water Leaking Into Cable Due to Heavy Rain.Cable Dried,Leak Repaired & Design Corrected
Event date:
Report date:
0002086007R00 - NRC Website
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_ At 1517 hours0.0176 days <br />0.421 hours <br />0.00251 weeks <br />5.772185e-4 months <br /> on 2/18/86 the primary security com uter (A) w Both security computers were halted and CPU A was rebooted as the prime machine in an effort to correct the problem. but it did not. Computer Services and curity I6C personnel analyzed the incoming data and identified the

'The board was pulled an ubsided at 1559 hours0.018 days <br />0.433 hours <br />0.00258 weeks <br />5.931995e-4 months <br />. Computer B was then rebooted as t e ackup computer, however within five (5) to ten (10) minutes of updating CPU B, the operator terminal keyboards locked up. Peth I computers were halted and rebooted to clear this problem. This occurred four (4) times before the system was finally deemed stable at 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br />.

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Identification of Occurrences Between the f 1517 and 1825 the securi com uter was considered unreliable due t -

Effects of Events 1517 to 1559 hours0.018 days <br />0.433 hours <br />0.00258 weeks <br />5.931995e-4 months <br /> -

Loss of ability to identify alarm 1607 to 1610 hours0.0186 days <br />0.447 hours <br />0.00266 weeks <br />6.12605e-4 months <br /> -

Terminal ey oar ockup 1631 to 1634 hours0.0189 days <br />0.454 hours <br />0.0027 weeks <br />6.21737e-4 months <br /> - Terminal keyboard lockup 1642 to 1645 hours0.019 days <br />0.457 hours <br />0.00272 weeks <br />6.259225e-4 months <br /> -

Terminal keyboard lockup 1725 to 1732 hours0.02 days <br />0.481 hours <br />0.00286 weeks <br />6.59026e-4 months <br /> -

Terminal keyboard lockup Description of Compensatory Measures Designation of Apparent Causes Due to the heavy rain on 2/18/86 some water rent leaked int '

- I a wet cabling caused

. alarms f rom severa. nput points. omputer erv ces personnel corrected t e update problem on the backup computers by reinitializing the event manager program.

Corrective Action 3 s til the wet cable dried out. The same car was returne to t and no further problems have been experienced.

2. The situation with the wet cable was further evaluated. The problem area was isolated t which was determined to have leaked. Th as repaired.
3. The design of th as considered to be inadequate. This and similar have since been replaced with a new design .

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G'na' o"'ca$ ' S*'oen Street Berna. connect' cut P O BOX 270 E.)C,Ycs' w7"~~' H ARTFORD. CONNECTICUT 06141-0270 g *aw w u . m u =.m--,

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(203) 666-6911 I

October 6, 1986 l

$cggg1No. 50-245 l

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Docket No. 50-336 Docket No. 50-423 l

Mr. Richard W. Starostecki, Director Division of Project and Resident Programs I NRC Region I U.S. Nuclear Regulatory Commission 631 Park Avenue l King of Prussia, 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 73.71(c).

i Very truly yours, NORTHEAST NUCLEAR ENERCY COMPANY A /

Wayne D. Romb  :

Station Superintendent Millstone Nuclear Power Station WDR/PLW:mo

Attachment:

Report of Security Event 86-007-01 cc: Director of Inspection and Enforcement, U.S. Nuclear Regulatory Commission, Washington, D.C. 20555 mmw W

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