05000000/LER-1986-020, Partially Deleted LER 86-020-00:on 860812,security Sys Experienced Loss of Power.Caused Withheld.Numerous Failures Experienced Until Machine a Designated as Prime.Procedures to Reboot Computers Revised

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Partially Deleted LER 86-020-00:on 860812,security Sys Experienced Loss of Power.Caused Withheld.Numerous Failures Experienced Until Machine a Designated as Prime.Procedures to Reboot Computers Revised
ML20238E769
Person / Time
Site: Millstone, 05000000
Issue date: 08/15/1986
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-86-020-02, LER-86-20-2, MP-9387, NUDOCS 8709150191
Download: ML20238E769 (5)
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LER-1986-020, Partially Deleted LER 86-020-00:on 860812,security Sys Experienced Loss of Power.Caused Withheld.Numerous Failures Experienced Until Machine a Designated as Prime.Procedures to Reboot Computers Revised
Event date:
Report date:
0001986020R00 - NRC Website
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On August 12, 1986 at 0004 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> the security systems Units 1, 2 and 3 experienced a loss of power.

This loss was caused this center supplies power to the security system.

to be mamamenen e system ope.usor however it was not known by the Security Shif t Supervisor who was atte.pting to reboot the Unit 1/2 system.

The Unit 3 system comput es "A" and "B" were restored at 0016 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />.

Numerous attempts to restors the Unit I

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The Unit 1/2 "B" computer was restored as the prime ma ine at 0054 by e on-call Computer Services en ineer.

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Both system ntil norTnal power was restored at approximately 0207 ours.

Numerous failures on the Unit 1/2 system occurred during troubleshooting to determine why the "A" machine would not act as prime machire.

This troubleshooting continued until 1916 hours0.0222 days <br />0.532 hours <br />0.00317 weeks <br />7.29038e-4 months <br /> when the "A" machine was finally made prime.

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Millstone Nuclear Power Station Unit 1 o 45 ;o j o Io 1214 l5 8l6 0 l2 l0 Op 0l3 0F 0F n,, _,,,,. m.. m oc w m u n ni Identification of Occurrence Loss of r to the security system and failure of th tich resulted in the failure of all security compu ers.

nce the machines ere rebcoted failure of the Unit 1/2 "A" computer to take prime.

Effects of Event Loss of alarm surveillance as follows:

Unit 1/2 0004 SL.inutes 1559 2 minutes 0112 2 minutes 1655 2 minutes 0150 3 minutes 1723 12 minutes

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1742 5 minutes 10 minutes g M 4 minutes 1 minute 0333 0359 Unit 3-g

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Description of Compensatory Measures Description of Apparent Cause 3)

Failure of the Unit 1/2 "A" machine to take control as the prime machine.

This problem was traced to an 4)

Delay in rebooting the Unit 1/2 system was due to lack of knowledge on the l

part of the Security Shift Supervisor th will on1 accept a reboot when the terminal is i j

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Millstone Nuclear Power Station Unit 1 01510 lo lo 12 l4 l5 8l6 0 l2 l0 0 [0 0 14 0F 0l4 l

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Corrective Action

i 1)

Breaker trip is being investigated and repaired by Unit 2 Operations, Maintenance, and Production Test personnel.

2)

The were replaced.

Ti as tested and

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returned to service by Pro ion Test Personnel.

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The problem with the

'as corrected by Computer Services personnel, i

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The procedure that outlines the steps to be taken to reboot the computers will be ised to specify that the console terminals must be in theh i

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"o IAugust 15, 1986 g

MP-9387 d -(> 3.Lf, Docket No. 50-245

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Docket No. 50-336 Docket No. 50-423 Mr. Richard W. Starostecki, Director Division of Project and Resident Programs NRC Region i U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Starostecki:

This letter forwards a report of a security related event pursuant to the requirements of 10CFR part 73, paragraph 73.71(c).

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY l

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Wayne D. Romberg Station Superintendent Millstone Nuclear Power Station WDR/PLW:cjh

Attachment:

Report of Security Event 86-020-00 Director of Inspection and Enforcement U.S. Nuclear Regulatory cc:

Commission, Washington, D.C.

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