05000423/LER-1990-022

LER 90-022-00:on 900618,discovered That Hourly Fire Watch Patrol Had Not Been Established in Battery 4 Inverter Room. Caused by Procedural Deficiency.Hourly Fire Watch Established.Procedures revised.W/900716 Ltr

ML20055G993
Person / Time
Site:	Millstone
Issue date:	07/16/1990
From:	Freeman P, Scace S NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-022, LER-90-22, NUDOCS 9007250027
Download: ML20055G993 (4)

LER-2090-022,

Event date:
Report date:
4232090022R00 - NRC Website

text

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'T" I8.$sI$tNEv'ic.7Elenny P.O. Box 270 HARTFORD. CONNECTICUT 06414-0270 twrte.ast Near tre gy co naany (10316F6-6000 July 16, 1990 MP-90-700 Re: 10CFR50.73(a)(2)(i)

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[' U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555

Reference:

Facility Operating License No. NPF-49 l<

Docket No. 50-423 Licensee Event Report 90-022-00 Gentlemen:

This letter forwards Licensee Event Report 90-022-00 required to be submitted within thirty (30) days pursuant to 10CFR50.73(a)(2)(1), any operation or condition prohibited by the plant's Technical Specification.

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

ff John P. Stetz

' Millstone Unit 1 Director SES/PAF:mo

Attachment:

LER 90-022-00 cc: T. T. Martin, Region 1 Administrator W. J. Raymond, Senior Resident Ins 3ector, Millstone Unit Nos.1, 2 and 3 D. H. Jaffe, NRC Project Manager, Millstone Unit No. 3 9007250027 900716 D PDR ADOCK 05000423 S PDC p h/ Ko8/V E6 22

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LICEN6EE CONT ACT FOR THis it ta M2i NAMg TE trPHONE NUMfil A AHL A cODi Peter A. Freeman, Engineer, X5302 2l0l3 4]4l7l-l1l7l9l1 COMPLETF ONE UNE FOR E ACH COMPONENT F AILUAF r>ESCAiBED IN TH!S AFDOAT tt3i j cAUSE SYSTEM COMPONENT M$MC* E '

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On June 18,1990 at approxunosly 0100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br />, with the plant at 80Q power (Mode 1), the Shift Supervisor (SS) discovered that an hourly firewatch patrol had not been estabhshed in Battery no. 4 inverter Room, located in the West Switchgear area of the Control Building. An hourly firewatch patrol was required after the fire detection zone panel for the affected area had been declared inoperable.

On June 16,1990 at approximately 2100 hours0.0243 days <br />0.583 hours <br />0.00347 weeks <br />7.9905e-4 months <br />, the fire detection zone panel for Battery no. 4 inverter Room was declared inoperable upon determining a Technical Specification surveillance could not be completed within its required due date because of manpower expenditures involving the intake Structure. Firewatch patrols were established for all areas that were being monitored by the subject fire protection zone panel with the exception of Battery no. 4 Inverter Room.

The root cause of the event was procedural deficiency. Specific guidance for establishing a firewatch patrol within the Battery no. 4 inverter Room when the subject fire detection zone panel was declared inoperable was not provided.

Immediate corrective action was to establish an hourly firewatch patrol in Battery no. 4 inverter Room. As action to prevent recurrence, the applicable procedures will be revised to include the subject inverter Room with its associated Battery Room. This revision will be implemented by July 16, 1990.

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UCENSEE EVENT REPORT (LER)  %**g",g *l @ g 'L5 y l',j,,,',",y,'f,,, t TEXT CONTINUATION ano n.oets uanao.m.ni eranen in-saco. v.s Nuew t i a r n o o 3 bc W Off o Manap.m.n1 and Ewopet Wasnington DC 20503 F AChJTY NAME 0) DOCKET NJMBER m t F A Ni#@F A sp PAGE (31 vgAR  % N Millstone Nuclear Power Station Unit 3 0l f,l 0l 0l 0l4 l2 l3 9l0 0l0l2 0l0 0l 2 OF 0l3 ['

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l. Deerir9 inn of Event On June 18,1990 at approximatel) 2l00 hours, with the plant at 809 power (Mode 1), the Shift ,

Supervisor (SS) discovered that an hourly firewatch patrol had not been estabhshed in Battery no. 4 ,

inverter Room, located in the West Switchgear area of the Control Building, after its associated fire  !

detection zone panel had been declared moperable. The event duration was approximately 2 days. 1 On June 16,1990 at approximately 2100 hours0.0243 days <br />0.583 hours <br />0.00347 weeks <br />7.9905e-4 months <br />, the fire detection zone panel for Battery no. 4 inverter Room was declared inoperable when it was determmed that a Technical Specihcation surveillance could not be completed within the required interval period because of manpower constreints. The surveillance could not be completed within its required interval because repetitive outages requiring contmual manning t of the intake Structure had occupied all available personnel. An hourly hrewatch patrol was established l for areas monitored by the subject hre detection tone panel including Battery no. 4 invener Room. This action was taken to ensure compliance with Technical Specification 3.3.3.7.b (Fire Detection Instrumentation). .

At approximately 2100 hours0.0243 days <br />0.583 hours <br />0.00347 weeks <br />7.9905e-4 months <br />, on June 18, 1990, during performance of the shiftly firewatch patrol tour, the SS discovered that while an hourly brewatch patrol had been established for surroundmg areas, except for Battery no. 4 invener Room. An hourly firewatch patrol was immediately estabbshed for Battery no. 4 invener Room. On July 16; 1990 surveillance testing for the fire detection zone panel which monitors Battery no. 4 inverter Room was successfully completed with no deficiencies noted.

II, cause nf Event The root cause of the event was procedural deficiency. Two procedures were utilized by the SS dering the event. A procedure entitled " Removing Fire Detection Equipment from Service," specihes associated coverage areas for individual fire detection zone panels but did not differentiate between the Battery Room and the Invener Room which are located adjacent to each other in the West Switchgear area of i the Control Building. Technical Specification 3.3.3,7 does not hst the subject Inverter Room as a separate hre zone while the Fire Protection Evaluation Report documents the Inverter Room as an independent zone. The applicable procedures were modeled from the Fire Control Panel data base >

which mimics the Technical Specification. The t.econd procedure utihzed by the SS, Fire Detection '

Protection and Control." specifies all associated areas for each fire detection zone panel, but does differentiate between the Battery Room and the Invener Room. Tab:es associated with the procedure  :

pictorially indicate the general location of hre detectors for each fire detection zone panel but does not meludc e hst of affected areas,

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r L 111. Annhsis of Event This event is reponable pursuant to 10CFR 50.73 (a)(2)(i), as an event or condition prohibited by plant Technical Specifications. Technical Specihcation 3.3.3.7.b requires an hourly firewatch patre! be established within one hour if more than one-half of the early warning fire detection instruments are deemed inoperable in any fire zone listed in table 3.3-11 (Fire Detection Instrumentation). ,

Fire suppression for the affected area consists of the unit hre brigade. The fire brigade is required to respond when mdication of hre is received at the Control Room. Fire detection was deemed inoperable because administrative requirements could not be fulfilled, nat because of Mechanical / Electrical failure. t On July 16, 1990 the applicable fire detectors were satisfactorily tested and deemed operable. Fire detection for the affected area was fully capable of performing its design function throughout the event. ,

Therefore, the event posed no signincant safety consequences, germ 3a

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TEXT CONTINUATION .no no.> ort Man p.mont er.nen (D-63oi. u s Nacier Aepuistory Commissen. Washington De 20666. ena to the Parerwork Steasetion Protect (316>01041, othee of Management and buoppt W ashington De P0603 F ACILITY NAME o) Docket NUMBER (2) t F A NUMPFm #p l FAGE (3i vEAn *Lassmat q qiEs-Millstone Nuclear Power Station Unit 3 ~ ~

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]V. Entrectwe Actinn immediate corrective action was to establish n hourly firewatch patrol in Battery no. 4 inverter Room located in the West Switchgear Room area of the Control Building. As action to prevent recurrence, the applicable procedures will be revised to include the subject inverter Room with its associated Battery Room. This revision will be instituted by July 18.1990.

V. Additionni informntion LERs86-027 and 90-016 discuss two previous events which have the sa".ie underlying concerns.

LER 66-027 (Mislocated Firewatch Due to Personnel Error) discusses an event in which a cornmunications error between shift personnel resuhed in a firewatch being improperly stationed. The corrective action for this event was to further clarify the physical location of fire detection zones. This revision did not provide for sub-divisions in any fire zone area. Therefore, the corrective actions of LER 88-027 would not have prevented the events of LER 90-022 from occurring.

LER 90-018 (Improperly Established Firewatch Due to Miscommunications) discusses an event in which a communications error between shift personnel resulted in an hourly firewatch patrol location being established by firewatch personnel in lieu of a non-licensed operator (PEO) as requested by the Shift Supervisor. The corrective action for this event was to modify the applicable procedure to verify proper firewatch patrol tocation within one hour of establishment. This corrective action would not have prevented the event of LER 90-022 from occurring, since the corrective action assumes that the areas identified for firewatches are accurately determined by shift management. Implementation of procedure changes to clearly identify these sub-divisions in conjunction with the corrective actions discuned in LERs88-027 and 90-022 should preclude similar events.

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