ML20064G709

/03L-0 on 781107:during Normal Oper a Release of Reactor Bldg Sump Effluent Req Cooling Tower Blowdown Flow to Increase Above Normal Rate to 4.39 Million Gallons for the Day,Due to Need to Dilute Sump Effluent Discharge

ML20064G709
Person / Time
Site:	Fort Saint Vrain
Issue date:	12/06/1978
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20064G706	List: ML20064G704 ML20064G709
References
LER-78-034-03L, LER-78-34-3L, NUDOCS 7812130141
Download: ML20064G709 (3)

Text

- 1 LICENSEE EVENT REPORT J .

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>gl required cooling tower blowdown flow to be increased above the normal rate. Because ; '

'ITTT1 I of the increased blowdown flow the limit of 3.75 million gallons per day specified l

, FFTin I by LCO NR 1.3, was exceeded. The total blowdown for November 7,1978, was 4.39 l

O s l million gallsons. There was no effect upon public health or safety. l

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIOh S h g l The cause for the excess blowdown flow was the rate of blowdown required for dilution l l l of the reactor building sump effluent discharge. Upon completion of the effluent l Iii2i l realse, the blowdown rate was reduced to the normal 1500 GPM rate. l

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REPORT DATE: Decembar 6, 1978 REPORTABLE OCCURRENCE 78-34

• ISSUE O.

OCCURRENCE DATE: November 7,1978 Page - 1 of 2 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO P. O. BOX 361 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267/ 78-34/03-L-0 Final IDENTIFICA1 ION OF OCCURRENCE:

On November 7,1978, the total quantity of effluent originating as cooling tower blowdown was in excess of the limit of LCO NR 1.3 and is reportable in

-n accordance with Fort St. Vrain Technical Specification AC l.5.2(b)2.

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EVENT DESCRIPTION

The total quanti-ty of cooling tower blowdown, as determined by the difference in blowdown integrator readings ' taken at 0000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br />, November 7,1978, and 0000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> on November 8,1978, was 4.39 million gallons. The limit of LCO NR 1.3 is 3.75 million gallons per day.

CAUSE DESCRIPTION:

i On November 6,1978, at 2235 hours0.0259 days <br />0.621 hours <br />0.0037 weeks <br />8.504175e-4 months <br />, a release of reactor building sump _ effluent was begun. In order to sasure compliance with = the limits of Table II, Column 2, 10CFR20, Appendix B, as 1: required by Fort St. Vrain Technical Specifications, the cooling tower blowdown rate was increased above the normal value. .The're-() lease continued for about 22' hours and res'ulted in the total blowdown flow for November 7,1978, being 4.39 million g'allons.

A Specification LCO NR 1.3 states that if the water quality limits of LCO NR 1.1 cannot be maintained simultaneously with the quantity limit then the quantity limit may be exceeded in order to maintain the quality limits. There is no provision in LCO NR 1.3 for excess blowdown to meet 'the limits of 10CFR20.

CORRECTIVE ACTION:

At the completion of the reactor building sump release' the cooling tower blow-

down was returned to its normal rate of 1500 GPM.

4 The procedure for radioactive waste release has been revised to prevent dilution blowdown rates in excess of the limits of LCO NR 1.3.

a p No further corrective action is anticipated or required.

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REPORTABLE OCCURRENCE 78-34 ISSUE O Page 2 of 2

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Prepared by: .! b U < ..

Richard R. Frost Technical Services Technician

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Reviewed by: / J

. - ._ _ JWM Gsha 42echnical Services Supervisor O

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Frank M. Mathie Operations Manager Approved by: .__ M< u4-. b ,

Don Warembourg [f

.fanager, Nuclear Production C> -.

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