ML20028H427

LER 90-021-00:on 901127,LCO Paragraph 3.0.3 Entered.Caused by Poor Communications.Mgt Reviewed Event & Events Leading Up to Incident & Concluded That Increased Awareness W/ Respect to Sys Status Must Be pursued.W/901227 Ltr

ML20028H427
Person / Time
Site:	Millstone
Issue date:	12/27/1990
From:	Criscione J, Scace S NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-021, LER-90-21, MP-90-1342, NUDOCS 9101040158
Download: ML20028H427 (3)

Text

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NRTHEAST UTILITIES om-e =cwseem sirat B-an Canat>=i I w7sI.Nss"a' Ns"e' tIfYeec$Inc* CEsn P.O. BOX 270

( 'J2 IN'a:NtNerhEel'Moany Nor1%ast Nucisar Erie gy Cornpany HARTFORD. CONNECTIOUT 06414-0270 (203)665 5000 Re: 10CFR50.73(a)(2)(i)(B)

December 27, 1990 MP-90-1342 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555

Reference:

Facility Operating License No. DPR-65 Docket No. 50-336 Licensee Event Report 90-021-00 Gentlemen:

This letter forwards Licensee Event Report 90-021-00 required to be submitted within thirty (30) days pursuant to the requirements of 10CFR50.73(a)(2)(i)(B), any operation or condition prohibited by the plant's Technical Specifications.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY FOR: Stephen E. Scace Director, Millstone Station n

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BY: \1 arry ias es Millst Unit 1 Dire (ctor SES/JLC:mo

Attachment:

LER 90-021-00 cc: T. T. Martin, Region 1 Administrator W. J. Raymond, Senior Resident inspector, Millstone Unit Nos.1, 2 and 3 G. S. Vissing, NRC Project Manager, Millstone Unit No. 2 y1/40 N ff&

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I II i i i i l I! I I I I I II I I Il l II I I I I SUPPLEMENT AL AEDOAT EXPECTED (14; MONTH DAY YEAA EXPECTED SJBMS SCN YES(n vos compiete EXPECTEO SUBMISSON DATEi NO U^II iib 3 l l l ABSTRACT (L mit to 1400 scaces. i.e. acoroximateiy 14 teen seng e-scace tycewritten imesj (16)

On November 27, 1990, with the plant at 1009 power, the Operations Department determined the action purements of LCO 3.1.2.4, to have at least two charging pumps operable and LCO 3.5.2.d, for an operable rymg pump and flowpath, were not satisfied. LCO paragraph 3.0.3 was entered at this time.

, Action was immediately taken to restore the B charging p. imp to the header within one hour. There was no power reducuon required because the B charpmg pump was restored to operable status within 56 minutes of system isolation. There were no automatic or manually iniuated safety system responses as a result of this event.

The root cause of the event was poor communications. hianagement originally authorized the work but did not realize the extent of the chargirip system tag out required for one of the charging system tasks. Initially,

[ charging and letdown were only to be isolated to reduce exposure, The Operations Department recognized the l requirements of LCO 3.1.2.4 and 3.5.2.d were not satisfied but not until the tags were hung and the system l isolated.

l NRO Form 366 (6-89)

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. Estnai.c b,ecen D.r testese to comply wars his o e 5: 60 0 *** 8 LICENSEE EVENT REPORT (LER)

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c.omm , ur..; e .m e.r,c u.-s30n uncstoN.uei.y bepusato'y commisse tne Pape work v4Pros A.auctior as.*ungton. DO 20556, ct 1315rw0104 L Ofbce of Manao.mem are Bucoet Wasnmclon DC 20603 F Ac4. TTY NAME (11 doc %ll 'lVVl'h8i il, t F R NWM A T* PAGE O t yg gn MN N umen mam Millnone Nuclear Power Station CDU

• Dl tl q Dj 0l3 l3 lt 4l0 0l2l1 0l0 0l 2 OF 0l2 Terr o. me. im, is 1.aw.c v . aceae , o.ac ro- one A i 4 m-If Descrintion of Event

'i On November 27, 1990, wth the p' ant a'.100 percent power, work had commenced on several-components of the charpmg and letdown synem .o repair leaks and adjust flow controls. In addition, a fire barrier seal repair around a letdown pipe penetri. tion was being made. The opportunity to perform ,

aH the jobs involvmg the charging and letdowr. syaern components m a coordinated evolution presented a chance for reduced radiation exposure by set ang the chargmg anc' letdown flow durmg all uork efforts.

However, while the system isolation was m p ropen, a reexammanon of all anociated Technical Specificauon LCO's revealed that the utm tw nm satsfy the requirements of all sections, and the action requirements of secuon 3.0.3 ucrt enime This was based on not meeting the Technical Specificanon requirements for an opert.bk charg.np flow path. This condition requires the plant to '

commence a shutdown if not corrected wah:r one hour, and steps were taken immediately to restore equipment. 'Withm 56 minutes the synems aere returned to operable status by restoring a charging flowpath, after clearing tags and ven!png preper vahr 1meups, and the unit exited from the acuans of section 3.0.3, There were no automouc a: manually mulated safety system responses as a resuh of this event.

11. Cnute of Event The root cause of the event was poor commun. canons. Management originally authonzed the work but -

did not realize the extent of the charp np . system tag out required for one of the charging system tasks.

Initially, charging and letdown were onh to be isolated to reduce exposure. The Operations Department recognized the requirements of LCO 3.il 4 anc Mld were not satisfied but not until the tags were hung and the system isolated.

111. Analvsic of Esent in accordance with the clarificauons prended m NUREO '022, Supp 1 concerning the use of LCO 3.0.3, the report is bemp submitteci pursuant to the requirements of 10CFR50.73(a)(2)(0(Bh "any operation or condition prohibited by the plamS. Technical Specifications." The plant complied with the Technical Specifications at all times dunng this event. The loss of all charging occurred for a period of 56 minutes. During this time, prenunter level was maintained within the allowable operating band.

Negative reactivity control was available curmp the time of charging header isolation by an operable rod ct.ntrol systemc There were no safety consequences as a result of this event.

IV. Corrective Action Management has reviewed this evem utv) the events leading up to this incident and has concluded that increased awareness with respect to pem status must be pursued at.the daily planning meeting. This will be acusely exercised in the futun to ensare clear and concise communications are maintained between all departments.

V. Addhional Information Similar LER's: None Ells:

CB (Ci ucal and Volume Controh g>orm m

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