05000267/LER-1980-073, Forwards LER 80-073/03L-0

Forwards LER 80-073/03L-0

ML19340D427
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/19/1980
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19340D428	List: 05000267/LER-1980-073, Forwards LER 80-073/03L-0 05000267/LER-1980-073-03, /03L-0:on 801121,effluent Discharge Antifoam Concentration Exceeded Tech Spec Limit for 3-h Period.Caused by High Blowdown Flow Rate.Procedure Will Be Implemented to Prevent Recurrence
References
P-80432, NUDOCS 8012300562
Download: ML19340D427 (4)

LER-1980-073, Forwards LER 80-073/03L-0

Event date:
Report date:
2671980073R00 - NRC Website

text

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II ime A Tf public Service Company *f Collondo

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PLATTEV1LLE, COLORADO 80651 December 19. 1980 Fort St. Vrain Unit No. 1 P-80432 a

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Mr. Karl V. Seyfrit, Director Nuclear Regulatory Comission Region IV i

Office of Inspection and Enforcement

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j 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012 Reference: Facility Operating License No. DPR-34 Docket No. 50-267

Dear Mr. Seyfrit:

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

80-73, Final, submitted per the requirements of Technical Specification AC 7.5.2(b)2.

l Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/80-73.

Very truly yours, h 7) L. _ Q Don Warembourg

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Manager, Nuclear Production DW/cls Enclosure V

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REPORT DATE:

December 19, 1980 REPETABLE OCCURRENCE 80-73 ISSUE O OCCURRENCE DATE:

November 21. 1980 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WEID COUNTY ROAD 191/2 PLATTEVILLE, COLORADO 80651 REP E T NO. 50-267/80-073/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

The concentration of anti-f oaming agent (Nalco 71-D5) exceeded the limit of LCO NR 1.1.

This event constitutes operation in a degraded mode of LCO NR 1.1 and is reportable per section AC 7.5.2(b)2 of the Fort St. Vrain Technical Specifications.

EVENT

DESCRIPTION

On November 21, 1980, the circulating water was treated with a biocide (Nalco 321) to control algae and biological growth. The biocide contains a surfactant and its use results in foaming at the induced draf t cooling tower which is controlled by the anti-foaming agent (Nalco 71-DS). There is no analysis method available f or determining the concentration of this agent.

and LCO NR 1.1 specifies the limit as "10 ppm (as calculated)."

When the calcualtion was performed af ter the November 21, 1980, addition of anti-foaming agent, it was found that the concentration had exceeded the 10 ppm limit for about 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> and had been 11.2 ppm at peak concentration at the specified control point.

The Goosequill Ditch discharges to the farm pond which averages out any sud-den changes in plant effluent contents before discharge to the river.

CAUSE

DESCRIPTION:

The anti-foaming agent is added to the circulating water system as a batch and in sufficient quantity to suppress foaming. The concentration in the system will generally exceed the 10 ppm limit at this time. Compliance with the LCO is achieved by diluting the blowdown from the tower with raw water from the circulating water system makeup pumps before the flow enters the en-vironment. In the case of the November 21, 1980, treatment, it was found that the blowdown rate had been 800 gallons per minute rather than the 600 gallons per minute rate expected at the time. The higher blowdown rate caused the

i REPORTABLE CCCUT"' NCE 80-73 ISSUE O Page 2 of 3

CAUSE

DESCRIPTION: (Cont'd) 140 limit to be exceeded for about 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />. There is no direct reading indi-cating of blowdown rate, so it is determined by reducing the raw water flow to zero and reading the total flow remaining, which was not done until the condition had corrected itself.

CORRECTIVE ACTION:

No corrective action was taken at the time, since the out of limit condition had corrected itself before the calculation of concentration was made.

A procedure will be prepared and implemented to adjust blowdown flow rate to prevent exceeding the limit of LCO NR 1.1.

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REPORTABLE OCCURRENCE 80-73 ISSUE O Page 3 of 3 Prepared By:.h O

Richard R. Frost Technical Services Technician I,/-

Reviewed By:

W. 'Gahm Technical Services Supervisor Reviewed By:

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Frank M. Mathie Operations Manager Approved By:

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Don Warembourg g

Manager, Nuclear Production l

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