ML20008F656

Forwards LER 81-021/03L-0.Detailed Event Analysis Encl

ML20008F656
Person / Time
Site:	Fort Saint Vrain
Issue date:	04/01/1981
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20008F657	List: ML20008F656 ML20008F660
References
P-81107, NUDOCS 8104210473
Download: ML20008F656 (1)

Text

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public senice company a2 ceneme 16805 ROAD 19%

PLATTEVILLE, COLOR ADO 80651 April 1, 1931 Fort S t. Vrain ,g Unit No.1 ,fe i. ! k[NQ

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P-81107 ,M h N{$%

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o% Tc e f WI Gc Mr. Karl V. Seyfrit, Director Q W /,;

Nuclear Regulatory Commission Y f j 77... g[,>'

Region IV NIEj Office of Inspection and Enforcement 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012

Reference:

Facility Operating License No. DPR-34 Docket No. 50-267

Dear Mr. Seyfrit:

Enclosed please find a copy of Reportable Occurrence Report No. 50-267/

81-021, Final, submitted per tha 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. 50-267/81-021.

Very truly yours, daen wc w Don Ware ourg f

i tbnager, Nuclear Production l DW/cls l

Enclosure 003 cc: Director, MIPC y l //

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810.4210 N3

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REPORT DATE: April 1, 1981 REPORTABLE OCCUSIENCE 81-021 ISSUE O OCCURRENCE DATE: March 2, 1981 Page 1 of 2 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 19 1/2 PLATTEVILLE, COLOR.E 80651 REPORT NO. 50-267/81-021/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

The liquid nitrogen storage tank level was less than 650 gallons. This con-stitutes operation in a degraded mode of LCO 4.2.12 and is reportable per For t S t. Vrain Technical Specification AC 7.5.2(b)2.

EVENT DESCRIPTION:

At 0530 hours0.00613 days <br />0.147 hours <br />8.763227e-4 weeks <br />2.01665e-4 months <br /> on March 2,1981, while operating at approximately 442 thermal power and 140 MW electrical, the liquid nitrogen storage tank level de-creased below the 650 gallon limit of LCO 4.2.12. A minimum level of 450 gallons was reached at 0730 hours0.00845 days <br />0.203 hours <br />0.00121 weeks <br />2.77765e-4 months <br />, at which time a scheduled delivery of liquid nitrogen arrived to refill the tank. An acceptable level of liquid nitrogen was reached at 1315 hours0.0152 days <br />0.365 hours <br />0.00217 weeks <br />5.003575e-4 months <br /> on March 2,1981; within the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> grace period allowed by LCO 4.2.12.

Operability of the low temperature filter absorbers and dewpoint moisture monitors was maintained throughout the occurrence.

CAUSE DESCRIPTION:

The decrease in liquid nitrogen inventory was due to dewpoint moisture monitor and law temperature filter absorber usage and unavailable nitrogen recondensers.

CORRECTIVE ACTION:

Arrival of the scheduled liquid nicrogen delivery restored the liquid nitro-gen storage tank to acceptable levels. A second load of liquid nitrogen was ordered and subsequently delivered to top off the system.

No further action is anticipated or required'.

. n , es s al e h1 v tt As a ir ~'

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REPORTABI.E OCCURRENCE 81-021 ISSUE O Page 2 of 2 Prepared By: <r_2. Ah Paul Moore Technical Services Technician Reviewed By: '

J. ahm J' W.' f Technion1 Services Supervisor Reviewed By:

Frank M. Mathie Operations Manager Approved By: V 4 Ach- '

Don 'daresbourg /

Manager, Nuclear Production l

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