05000267/LER-1981-004, Forwards LER 81-004/03L-0

Forwards LER 81-004/03L-0

ML19351G394
Person / Time
Site:	Fort Saint Vrain
Issue date:	02/13/1981
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19351G395	List: 05000267/LER-1981-004, Forwards LER 81-004/03L-0 05000267/LER-1981-004-03, /03L-0:on 810115,high Residual Chlorine Levels Found in Circulating Water Sys Liquid Effluent Sample.Cause Unknown.Subsequent Samples Normal
References
P-81052, NUDOCS 8102230627
Download: ML19351G394 (1)

LER-1981-004, Forwards LER 81-004/03L-0

Event date:
Report date:
2671981004R00 - NRC Website

text

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I public service company ce cdcasde 16805 ROAD 19%

PLATTEVILLE, COLOR ADO 80651 February 13, 1981 Fort St. Vrain Unit No. 1 P-81052 t

Mr. Karl V. Seyfrit, Director Nuclear Regulatory Co= mission Region IV Office of Inspection and Enforcement 611 Ryan Plaza Drive i

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 Repertable Occurrence Report No. ' 50-267/

81-004, 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

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Reportable ' Occurrence Report No. 50-267/81-004.

Very truly yours, _

'ly uwbMvf W.

Don Warembourg Manager, Nuclear Production 4.

DW/ cis 003 Enclosure cc: Director, MIPC 5

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REPORT DATE:

Februarv 13, 1981 FIPORTABLE OCCURRENCE 81-004 Determined ISSUE O OCCURRENCE DATE:

Januarv 15, 1981 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 191/2 PLATTEVILLE, COLORADO 80651 REPORT No. 50-267/81-004/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

During regular chlorination of the circulating water system, the total residual chlorine limit of LCO NR 1.1 was exceeded in the plant liquid ef-fluent.

This is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)2.

EVENT DESCRIPTICN:

On January 1,1981, during a =aintenance shutdown period, the plant oper-ations personnel chlorinated the circulating water systems as scheduled and then took the required plant liquid effluent sample. The sample was.

found to have a residual chlorine limit of 0.7 ppm. This is in excess of the LCO NR 1.1 limit of.0. 5 ppm.

The chlorination system was checked and no problem was found' with the equip-ment or the circulating water blowdown system. With the long liquid ef-fluent discharge path and the hold up period in the plant's farm ponds, it is improbable that any chlorine would be discharged into the South Platte River.

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- The chlorination of the circulating water system has continued on a daily basis with the plant liquid effluent chlorine residual within the limits: of the LCO.

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CAUSE

DESC2IPTION:

Chlorine consumption in the circulating water system is a complex process that is dependent upon several variables. Af ter the high residual chlorine-i level, the plant chemist checked the chlorination system and the circulating water blowdown system and could not-identify'any-cause.for the high chlorine residual level. Subsequent chlorinations and the associated samples did not reveal any recurrence of.the high residual chlorine level.

4 REPORTALLE OCCURRENCE 81-004 ISSLT 0 Page 2 of 3 CORRECTIVE ACTION :

The chlorination of the circulating water system was completed before the sample was taken. Therefore, no corrective action was required, a

Subsequent chlorinations and sample did not indicate a recurrence of the high residual chlorine limit.

No further corrective action is anticipated or required.

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REPORTABLE OCCURRENCE 31-004 ISSUE O Page 3 of-3 Prepared By:

Asa B.

Reed Technical Servic Technician Revieved By:

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f J. W. Udhm i

Technich Services Supervishr O

Reviewed By:

Frank M. Mathie Operations Manager Approved By:

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Don Waresbourg Manager, Nuclear Production