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-2086-020, 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:
0002086020R00 - NRC Website
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APPhovt0 OM8 to 31e64104 LICENSEE EVENT REPORT (LER) 8 5 *' 8 8 8 ' "

  1. Acattiv haut its poCKat uvustacal Fact m Millstone Nuclear Power Station o is Io Io Iol2l4 51 i lor l 0 l 4 )

TITLE les Loss of Computer System Units 1, 2 and 3 8 V E NT DA Y t all Lt A kvWet t it) AEPOAY OATI (7) CTMte F ACILITit s isavogvt0 ten WONTM DAY YEAa vtam 58,0

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%AMI Titt*MONE hvheta anta Coct Patricia L. Weekley - Security Supervisor COMP Lif t Okt Leht 80m ( ACM CohePOWINT F A8LU88 Ot9Ca f 810 IN TMis m E*0a7 r13, 203 4 i 47 i i -i l79i i l CAv$t Sv5 TEM C0ts*0% E N T "fvN^$4 YO e'aff CAvst s v 5T E M COW 80444T "# C R g Og, tai '

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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 supplies power to the security system. this center 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 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 "A" I

s were made however due to th

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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.

"A" s also restored The Unit 1 2 '

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LICENSEE EVENT REPORT (LER) 8 ACILifv 4AA81 nl 00CaET wvusta Qi FAQt 4 Millstone Nuclear Power Station o gs g o ;o lo;2 4 15 2 lorj0 l 4 f a f L t is.

Lo6.S of Computer System Units 1, 2 and 3

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Att A COct l Patricia L. Weekley - Security Supervisor 2 0:3 4:47 1 1i l j7 9 il 3 CosettTE Okt Leht som E ACM COMPoa.Em? F ArLya8 Of 9CRIS60 sm TMig mEpowT tts CAvst ses'tu c0urcht%T "fo pa *s Cavil f v 8T 8 W COu80Nimi TyC m ta t iia V iJi X i NlS i i 18 N i i i i i i i i  ! I I I I l l I I I I I I

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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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wnC seesn htA U 8 NUCLi A8 88GVLAi0AT COMurssach LICENSEE EVENT REPORT (LER) TEXT CONTINUATION Areaom o =o me-cio.

ve,nu s v a F ACILIT V h AMI 113 DOCS 4 T NUMBim Qi LE R NUMet R let PAGE 17 viam Sl ovi k t e a k i

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Millstone Nuclear Power Station """" '

Unit 1 o 45 ;o j o Io 1214 l5 8l6 -

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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

  • 0207 1 minute n 1742 5 minutes 0333 0359 4 minutes 10 minutes g Mg ~ Unit 3-1 minute

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0453 2 tinutes 12 minutes 0606 / minutes *0207 1 minute i 1916 Unit 1 "A" c r mad ri hine.

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  • Loss due t -

1 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 ,

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' " "- LICENSEE EVENT REPORT (LER) TEXT CONTINUATION Aremovie oMe ~o moaio.

EAPIR15 8'31/N I F ACILITY h&Mt its DOCm&T esvusta t2l gga gyugg A 183 PAOl G Millstone Nuclear Power Station

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Unit 1 01510 lo lo 12 l4 l5 8l6 -

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.x, w - ~ = m ~ ~ n c r wan,n Corrective Action i

1) Breaker trip is being investigated and repaired by Unit 2 Operations, l Maintenance, and Production Test personnel. '
2) The were replaced. Ti as tested and #-)

returned to service by Pro ion Test Personnel. .

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3) The problem with the 'as corrected by Computer Services personnel, i
4) The procedure that outlines the steps to be taken to reboot the computers I will be ised to specify that the console terminals must be in theh i 1

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1 NORTHEAST UTILITIES \ / ' " * ' ' "'" " S * " 8 ""' S """ C """' *'

l es ..ss. cme ri eac=c nw. - / P O. BOX 270

.o .'ta w . . ,0. w . 2, . , d H ARTFORD, CONNECTICUT 06141-0270 L ' J %%CZOO%'.~J. (20m ses-sm

'- j g "o IAugust 15, 1986 Q [ 3 d[t[fc{ ch'[4 MP-9387

-(> 3.Lf, Docket No. 50-245

/ 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 && l l

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

Attachment:

Report of Security Event 86-020-00 cc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission, Washington, D.C. 20555 w ousesammann flammushielemasses.

oW

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