ML19249C527

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Submits Environ Event Rept 79-07 Re Operation of Plant Circulating Water Sys in Partial Recycle Mode in Aug 1979. Higher Blowdown Flow Rates Were Necessary to Maintain Water Inlet Temps at Less than 85 F
ML19249C527
Person / Time
Site: Prairie Island  Xcel Energy icon.png
Issue date: 09/04/1979
From: Ward E
NORTHERN STATES POWER CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 7909120436
Download: ML19249C527 (1)


Text

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NSP NORTHERN STATES POWER COMPANY M I N N E A PO LI S. M I N N E s oTA 55401 t

September 4,1979 Mr J G Keppler, Director, Region III Office of Inspection & Enforcement U S Nuclear Regulatory Coc: mission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr Keppler:

PRAIRIE ISLAND NUCLEAR GENERATING PL. INT Docket No. 50-282 License No. DPR-42 50-306 DPR-60 Environmental Event Report 79-07 Cooling Tower Operations - August Under TS B-5.4.2. A, we are furnishing two copies of this Environmental Event Report covering operation of the plant circulating water system in the partial recycle mode with daily average blowdown flow in excess of 150 cfs.

Daily average blowdown flow in excess of 150 cfs was required for each day (except for August 1) during the month of August. Excess blowdown flows ranged from a low of 183 cfs on August 15 to a high of 866 cfs on August 6.

The daily blowdown flow rate average for the month was 423 cfs.

The higher flows were required to maintain cooling water ini.. cemperatures at less than 850F.

Yours very truly, E C Ward, PE Manager-Nuclear Environmental Services EC'1/ak cc: Director, TRR c/o DSB (17)

MPCA QO Attn: J W Fe man 3(og

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