ML19332D127

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LER 89-026-00:on 891023,turbine-driven Auxiliary Feedwater Pump Room Became Filled W/Steam During Monthly Surveillance Test.Caused by Personnel Inattention to Detail.Individual Counseled & Valves closed.W/891122 Ltr
ML19332D127
Person / Time
Site: Millstone Dominion icon.png
Issue date: 11/22/1989
From: Hulme N, Scace S
NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-89-026, LER-89-26, MP-13773, NUDOCS 8911300047
Download: ML19332D127 (4)
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L M General Othces Seloon Street. Berhn Connecticut )

N I. U a's*sIeDEidY= Y c N S# P.o BOX 270 i NasY$teNevIed*Mny HARTFORD. CONNECTICUT 06414-0270 I No theast Nueet' f rergy Company (203)60s-6000 l November 22,.1989 MP-13773 Re: 10CFR50.73(a)(2)(i) & l 10CFR50.73(a)(2)(ii) ,

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

Reference:

Facility Operating License No. NPF-49 Docket No. 50-423 Licensee Event Report 89-026-00 Gentlemen:

This letter forwards Licensee Event Report 89-026-00 required to be submitted within thiny (30) days pursuant to 10CFR50.73(a)(2)(i), any operation or condition prohibited by the Plant's Technical Specifications, and 10CFR50.73(a)(2)(ii), any event or condi.

tion that resulted in the nuclear power plant being in a condition that was outside the design basis of the plant.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPAhY A

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cace Station Superintendent Millstone Nuclear Power Station SES/NDH:tp

Attachment:

LER 89-026-00 cc: W. T. Russell, Recion 1 Administrator W. J. Favmond, S'enior Resident Ins >ector., Millstone Unit Nos.1, 2 and 3 D. H Jaffe, NRC Project Manager, Millstone Unit No. 3 8911300047 391122 "

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Turbme-driven Auxihary Feedwater Pump Open Drain Yalve Due to Personnel Error EVENT DATE 16i LEt4 NauPEm (E i l REPOct DATF eti OTwFm r Acit Tes s; iNvotvrn ei MQlO DAY YEAR YEA 4 MONT H DAY YEAR 8 ACIUT Y NAME 6 el si of of ol I I

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On October 23,1989, at 1024 hours0.0119 days <br />0.284 hours <br />0.00169 weeks <br />3.89632e-4 months <br /> with the plant at 100% power, the Turbine-driven Auxiliary Feedwater (TDAFW) Pump room became filled with steam dunnr the TDAFW Pump monthly surveillance test. The pump was stopped and the ensuing investigation determmed that a normally locked closed dram valve was locked, approximately 1.5 turns open. The drain caht was closed, locked and the TDAFW Pump surveillance was then successfully performeci.

The TDAFW Pump was last successfully tested on September 21,1989 Therefore, the pump was inoperable from this time until the event date, a perico of 30 days. During this time, the "B" and " A" Train Motor Driven Auxihary Feedwater (MDAFW) Pumps were inoperable for approximately 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> (on 10/3 and 10/17 respectively), when the associated Emergency Diesel Generator was out of service for preventive maintenance. Dunny these perioos one MDAFW pump would not function during a loss of pow er. With the TDAFW pump moperable at the same time, the plant was outside its desi.n i basis.

The root cause of the event was personnel inattention to detail in failing to completely close the drain. As a contributing cause, the TDAFW Pump procedure did not require the drain valve to be verified closed by another operator (PEO). The PEO responsible for failing to close the drain was counselled on bemp attentive to details when operating plant equipment. Thc final valve hneup check list was modified to ,

include checking the dram valve locked anti closed, gAgorm366

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kepot twy ovieCommission man.p.m.ni er.non +sson Weinengton v s enc to De 20E65 tte Peo m.m uen.o won no kepactio.n suop t Pwo.i.ct (31!,0-010a nington. L otnce of De 20603 F ACUTY NAME i1) DoOKET NJMBER (24 t ra NtuPFm o I F AGE (31 YEAR E hiilktone Nuclear Power Station U"Il 3 ~ ~

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1. Deimntinn of Etem On October 23,1969, at 1021 hours0.0118 days <br />0.284 hours <br />0.00169 weeks <br />3.884905e-4 months <br /> with the plant in N1 ode 1 at 2004 power, at a temperature of 587 degrees Fahrenheit and a pressure of 2:50 psia, the Turbine-drnen Auxihary Feedwater (TDAFW) Pump room was filled with steam during the monthly surveillance test. The pump was

. stopped and an mvestigation was conducted to determme the cause. Wnhm an hour of stopping the pump. a normally locked closed drum valve was found approximatel) 1.5 turns open. The dram valve was closed, locked and the TDAFW Pump surveillance was then successfully performed.

It was determined that the drain vahe was 1.5 turns open from September 21, 1969, until October 23, 1989. Dunny this period, the TDAFW Pump was inoperable. However, the hiotor-dnven Auxihary Feedwater ($1DAFW) Pumps were available to perform the AFW System function during any emergency except for two, b hour periods. On October 3,1989, *B" Train Emergency Diesel Generator (EDG) was inoperable for approximately 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> because of preventive maintenance.

Likewise, the

  • A" Train EDG was moperable for approximately S hours on October 17, 1989.

Therefore, one N1DAFW pump would not have been available to function during a loss of power event when its respecuve EDG was moperable, 11, Cee of Frent 11 was determined that the normally locked closed TDAFW Stop Valve Drain was locked approximately 1.5 turns open when aligning the TDAFW pump after the previous surveillance test on September 21, 1969, The root cause for the drain vahe bemp open was operator inattention to detail in faihng to completely close the dram valve. As a contnbuting cause, the TDAFW Pump procedure did not require the subject drain vahe to be verified closed by another operator.

111. AnMr* of Event This event is reportable in accordance with the requirements of 10CFR50.73(a)(2)(i) and l 10CFR50.73(a)(2)(ii). Plant Technical Specification 3.7.1.0 requires the TDAFW Pump to be operable in hiodes 1, 0, and 3. As the pump, turbine, and associated support equipment are not environmentally quahfied for a (harsh) steam erwitonment, the TDAFW Pump was considicred inoperable during the period that the drain valve was not closed.

The TDAFW Pump was last successfully tested on September 21, 1969. After stopping the pump, non-licensed operators (PEOs) cycled the dram vahes and performed a fmal valve imeup check in accordance with the procedure. At this time a PEO inadvertently left one of the three drain valves locked in a throttled position.

The TDAFW Pump operated for approximately ten minutes in a steam atmosphere before the pump was -stopped to investigate the cause of the steam. It functioned satisfactorily in the high humidity, but continued operation could not be assured because the pump is not qualihed for the harsh steam environment.

As stated in the FSAR, either the two $1DAFW Pumps, or the TDAFW Pump are of sufficient capacity to remove the sensible and decay heat from the reactor core. hiaintenance records and operator logs were reviewed to determine any periods where a $1DAFW pump was not available.

It was discovered that Train " A" EDG was inoperable for approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> due to preventive maintenance. Likewise. Train "B" was inoperable for approximately 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> dunng this period.

Therefore, one N1DAFW Pump would not have been available dunng these periods when the respective EDG was inoperable. At all other times, both h1DAFW Pomps were operable dunng the i time the drain on the TDAFW Pump was open. Ako the TDAFW Pump did operate satisfactorily in a steam atmosphere for a short period of ume, so it would have served as a temporary backup to the h1DAFW Pumps.

NAC Form 366A 16-89)

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Ojo 0l 3 OF ol $l ol ol ol4 l2 l3 8l9 0l 2l6 0l3 its.T w me,e spac. ,s roosneo use aaoiuonai NH: Fo m 366A si on The conchtion of the TDAFW Pump and one MDAFW Pump inoperable at the same time would require an immediate report per 10CFR50.72(b)(1)(ii). An immediate notification was not made smce the condnic,n was discovered during the imestigation phase, approximately 25 days after the

IV. rorrective Action immediate correcthe action was to close the vahe and the TDAFW Pump sur eillance was then successfully performed.

The operator responsible for faihng to close the drain was counselled on being attentive to details when optrating plant equipment.

The post surveillance vah'e lineup checkhst contributed to this event. Instructions for cychng the three dr;.m vahes, which dram the turbine casing, were meluded in the body of the procedure.

The fmal step for restoring the TDAFW pump to an operable status is to perform an independently verified AFW vahe lineup check. Smce the three dram vah'es were presumably cycled and locked closed in a previous step, they were not included m the .fmal vahe lineup check. Therefore, there was no independent verification that the drain valves were closed and locked. The form used in the fmal valve lineup check was revised to include independent verification that all three drain valves are closed and locked.  ;

V. Addnionnl Inintmntinn The driver for the TDAFW Pump is a horizontal, type GS-2N steam turbine manufactured by Terry Corporation. The turbine is controlled by a Model PGG, mechanical-hydraulic governor manufactured by Woodward Governor Compan). The pump is a seve.i-stage, horizontal, type MSD-DS pump manufactured by Bingham-Willamette Company.

A similar event is documented by LER 86-056-00, "Inoperabihty of 'B' Train Safety injection Pump Cooler Due To inadequate Procedure" in this event. valve manipulations were required to be performed within a procedure in order to establish a specified flow contdtion. The procedure did not require an inctependent check that flow was restored. As corrective action, the procedure was modified to have an independent check made.

E119 Codes Synem Comnonent<

Auxiliary Feedwater System - BA Turbine - TRB ,

Governor - GRL Pump - P Valve - V NAc Form 366A (6-89) .

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