05000267/LER-1981-011, Forwards LER 81-011/03L-0

Forwards LER 81-011/03L-0

ML20003B829
Person / Time
Site:	Fort Saint Vrain
Issue date:	02/19/1981
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20003B830	List: 05000267/LER-1981-011, Forwards LER 81-011/03L-0 05000267/LER-1981-011-03, /03L-0:on 810121,liquid Nitrogen Storage Tank Level Noted Below Min Required.Caused by Sys Usage & Late Delivery of Liquid Nitrogen.Delivery Restored Tank Levels to Acceptable Values.Second Load Delivered to Top Off Tank
References
P-81060, NUDOCS 8102250641
Download: ML20003B829 (3)

LER-1981-011, Forwards LER 81-011/03L-0

Event date:
Report date:
2671981011R00 - NRC Website

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7 puhuc service company of ccnondo 16805 Weld County Road 191/2, Platteville, Colorado 80651 N'

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F rq February 19, 1981

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- q Fort St. Vrain Unit No. 1 P-81060 "l 1d

..b Mr. Karl V. Seyfrit, Director Nuclear Regulatory Commission Region IV Office of Inspection and Enforcenent 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012 Reference: Facility Operating License No. DPR-34 Docket No. 50-267

Dear Mr. Seyfric:

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

81-011, 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. 50-267/81-011.

Very truly yours, WW Don Warembourg &

y Manager, Nuclear Production DW/ cls Enclosure ec: Director, MIPC -

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- 81022 50(oY/

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REPORT DATE:

Feb ruarv 19, 1981 REPORTABLE OCCURRENCE 81-011 ISSUE O OCCURRENCE DATE:

Januarv 21, 1981 Page 1 of 2 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADC 16805 VELD COUNTY ROAD 191/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/ 81-011/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

On January 21, 1981, the liquid nitrogen storage tank level decreased to less than 650 gallons. This constitutes operation in a degraded = ode of LCO 4.2.12 and is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)2.

EVENT

DESCRIPTION

At 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br /> on January 21, 1981, with the plant operating at approx 1=ately 40:: thermal power, the liquid nitrogen storage tank level decreased celow the 650 gallon limit of LCO 4.2.12.

A minimum level of approximately 400 gallons was reached at about 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br />.

A shipment of liquid nitrogen was received at 1020 hours0.0118 days <br />0.283 hours <br />0.00169 weeks <br />3.8811e-4 months <br /> which restored the liquid nitrogen storage tank level to at acceptable level by 1250 hours0.0145 days <br />0.347 hours <br />0.00207 weeks <br />4.75625e-4 months <br /> on January.21, 1981.

Operability of the icw temperr. cure absorber and the dewpoint moicture =oni-tors was maintained throughout the occurrence.

CAUSE

DESCRIPTION:

The decrease in liquid nitrogen inventory was due to heavy sysre: usage, unavailable nitrogen recondensers, and late arrival of a scheduled liquid nitrogen delivery.

CORRECTIVE ACTION:

- Receipt of the scheduled liquid nitrogen delivery restored the liquid nitro-gen ' storage tank le rel to acceptable levels. A second load of liquid nitro-gen was ordered and subsequently delivered to top off che storage tank.

No further corrective action is anticipated or required.

REPORTABLE OCCURRENCE 81-011 ISSUE O Page 2 of 2 Prepared By:

ed/ W Paul Moore Technic d Services Technician Reviewed By:

e ervices Supervisor Reviewed 'Jy:

Frank M. Mathie Operations Manager Approved By:

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Manager,NuclearProduc[ tion Don Warembourg

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