05000267/LER-1981-071, Forwards LER 81-071/03L-0.Detailed Event Analysis Encl

Forwards LER 81-071/03L-0.Detailed Event Analysis Encl

ML20062L898
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/08/1981
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20062L903	List: 05000267/LER-1981-071, Forwards LER 81-071/03L-0.Detailed Event Analysis Encl 05000267/LER-1981-071-03, /03L-0:on 811108,w/reactor at Full Power Level,In Liquid Nitrogen Storage Tank Decreased Below Tech Spec Limit.Caused by High Sys Consumption W/Late Delivery of Liquid Nitrogen
References
P-81309, NUDOCS 8112160160
Download: ML20062L898 (4)

LER-1981-071, Forwards LER 81-071/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2671981071R00 - NRC Website

text

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,7 public servlee company oe conotmde VA 16805 Road 19 1/2, Platteville, Colorado '80651-9298 December 8, 1981

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Nuclear Regulatory Commission

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611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011

Reference:

Facility Operating License No. DPR '

Docket No. 50-267.

Dear Mr. Collins:

Enclosed please find a copy of Reportable Occurrence Report No. 50-267/81-071, Final, submitted per the requirements'of Technical Specification AC 7.5.2(b)2.

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/81-071.

1 Ve truly yours,-

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Don Warembourg

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P REPORT DATE:

December 8.1981 REPORTABLE OCCURRENCE 81-071 ISSUE.0 OCCURRENCE DATE:

November 8, 1981 Page l'of 3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLCRADO 16805 WELD COUNTY ROAD.19 1/2~

PLATTEVILLE, COLORADO 80651-9298 REPORT NO. 50-267/81-071/03-L-0 Final IDENTIFICATION OF, OCCURRENCE:

On November 8, 1981,*d'uring steady state power operation, the volume of liquid nitrogen in~'the liquid nitrogen storage tank was lower than,.

the limit of 650 gallons specified by LCO 4.2.12.

This is operation "

in a degraded mod'e' df'LC0 4.2.12 and is reportable per Fort St. Vrain' Technical Specificat'fon AC 7.5.2(b)2.

EVENT

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DESCRIPTION

At 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> on November: 8; 1981, with the' plant operating at 100*'

power and 328 MWe, the volume-of liquid nitrogen in the l_iquid nitrogen storage. tank Was noted as being below the 659 gallen level limit of LCO 4.2.12.

p delJvery,f of iiqu'id nitrogen arrived on site at A

scheduled 0610 hours0.00706 days <br />0.169 hours <br />0.00101 weeks <br />2.32105e-4 months <br />, November 8, 1981.. By 0630 hours0.00729 days <br />0.175 hours <br />0.00104 weeks <br />2.39715e-4 months <br /> on November 8, 1981, an acceptable level in exc'ess of 'the 650 ga'llon limit had been restor'ed' <

as a result of off-loadin'y the liquid nitrogen into the liquid,,

nitrogen storage tank, within/the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> allowed by LCO,4.2.12.

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liquid njtrogen in tiie st_o. rage tanE..;

The lowest measured slevel' of during the period f rom '0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> to 0630 hours0.00729 days <br />0.175 hours <br />0.00104 weeks <br />2.39715e-4 months <br /> on h% nmber 8, 1981, " '

was 450 gallons.

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The dewpoint moisture monitors and low t'emperature adsorber remained operable during this occurrence.

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CAUSE

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DESCRIPTION

21 The simultaneous high use of liquid nitrogen atTfull power' operation, together with the late arrival of ~ a prescheduled liquid nitrogen delivery resulted in the lowering of the liq'uid nitrogen level beicw the 650 gallon limit of LCO 4.2.12.

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REPORTABLE OCCURRENCE 81-071 ISSUE O

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CORRECTIVE-ACTION:

'A ; scheduled. load of liquid. nitrogen was received..Th'e delivery of-the. liquid nitrogen to the system brought the-tank to.an acceptable 4'

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