ML19318D247

Forwards LER 80-028/03L-0

ML19318D247
Person / Time
Site:	Fort Saint Vrain
Issue date:	06/19/1980
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19318D248	List: ML19318D247 ML19318D254
References
P-80166, NUDOCS 8007080254
Download: ML19318D247 (5)

Text

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l pubHe Service Company @ Odondo i 16805 ROAD 19%

. 3._ _ _s PLATTEVILLE, COLOR ADO 80651 June 19, 1980 Fort St. Vrain Unit No. 1 P-80166 Mr. Karl V. Seyfrit, Director Nuclear Regulatory Comission Region IV Office of Inspection and Enforcemont 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/

80-28, 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. 50-267/80-28.

Very truly yours, h fwe-_k=-_

Don Warembourg Manager, Nuclear Production DW/cis Enclosure cc: Director, MIPC l

0 o' l 96 I

II' 8007080257 (

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OCCC1tRENCE REPORT DISTRIBUTION Number of Copies e

Department of Energy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter)

San Francisco operations Office Attat California Patent Group 1333 Broadway OslLland, California 94612 De pa r tme n t o f Ene rgy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter)

Office of Nuclear Engineering Programe Washington. D.C. 20545 Dep ar tmen t o f Ene rgy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter)

Mr. Glen A. Newby. Chief HTR Branch ,

Divistou of Nuclear Power Development Mail Station 5-107 Washington, D.C. 20545 Department of Energy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter)

Attat Senior Program Coordinator P. O. Box 81325 San Diego. California 92138 Mr. Karl V. Seyfrit. Director ------------------------- (Original of P Letter Region IV and Copy of LER)

Of fice of Inspection and Enforcement Nuclear Regulatory Commi-sion 611 Ryan Plaza Drive Sutta 1000 Arlington. Texas 76012 Di r e c to r - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 (P Letter, LER)

Of fice of Management Information and Program Control U. S. Nc'.ur Ragulatory Conniasion Washington, D.C. 20555 W. Bushnell. Site Manager - -------------------------- 10 (original of FPLC Letter General Atomic Company plus Two Copies, One P. O. Box 426 Copy of P Letter. One Platreville Colorado 80651 Copy of LER)

NRC Resident Site Inspector -------------------------- 1 (P Letter. LER) i 1

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REPORT DATE: Jura 19. 1980 REPORTABLE OCCURRENCE 80-28 * '

ISSUE O OCCURRENCE DATE: May 20, 1980 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. 50-267/80-28/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

During regular chlorination of the circulating water system, the total residual chlorine limit of LCO NR1.1 was exceeded in the plant liquid effluent. ,

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

EVENT DESCRIPTION:

3n May 20, 1980, operations personnel chlorinated the circulating water sys-tem. Because the chlorine demand had been high and the residual chlorine level low, the chlorination rate had been increased. At 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />, the plant liquid effluent was sampled. The residual chlorine level was found to be 0.64 ppm. This is in excess of the LCO NR1.1 limit of 0.5 ppm residual chlorine. Chlorination rate and circulating water blowdown were reduced and followup samples were taken as required. The residual chlorine level at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> was 0.0 ppm at the junction of the Goosequill Ditch and Jay Thomas Ditch.

The Goosequill Ditch feeds into the Jay Thomas ditch which flows into the farm ponds. This provides a long delay time and allows the chlorinated water to be diluted. The Chemistry Department sampled the farm pond discharge to the South Platte River and found no residual chlorine in the discharge.

CAUSE DESCRIPTION:

Over the previous several days, the chlorine demand had been increasing and the Chemistry Department had proposed an increase in chlorination rate to maiatain a chlorine reef dual in the circulating water system. On May 20, the chlorine demand was icwer than the previous day, and this along with the increased chlorination rate caused the residual chlorine to increase. The circulating water blowdown raised the residual chlorine in the plant liquid effluent to a value of 0.64 ppm chlorine.

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REPORTABLE OCCURRENCE 80-28 ISSUE O Page 2 of 3 CORRECTIVE ACTION:

When the high chlorine residual was found, the chlorination rate and the blowdown rate f)r the circulating water system were reduced and Chemistry closely monitored the system till a followup sample indicated a total chlorine residual of 0.0 ppm chlorine.

No further correction is anticipated or required.

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REPORTABLE OCCURRENCE 80-28 .

ISSUE O Page 3 of 3 Prepared By:

Asa B. Reed /

Technical Serfices Technician Reviewed By:

. W.' G~ahm Technical Services Supervisor Reviewed By: \-

Frank M. Mathie Operations Manager ,

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Approved By: hM Don Warembourg [

Manager, Nuclear Production t