ML20085F398

AO AO-75-6:on 750404,plant Discharge Effluent Heat Rate Exceeded Tech Specs.Apparently Caused by Plant Procedure Problems & Beginning Operation of Newly Installed Closed Cycle Cooling Sys

ML20085F398
Person / Time
Site:	Palisades
Issue date:	04/14/1975
From:	Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20085F406	List: ML20085F398 ML20085F408
References
AO-75-6, NUDOCS 8308220078
Download: ML20085F398 (2)

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-_ g/f I], (,-),lr., .-C /'p' C v lJ u kTl cone,a, on ce.: 212 we.t u,cn,gan Avenue. Jackson, Michigan 49201 Area Code 517 788-0550 April 114, 1975 Re: Docket 50-255 Division of Reactor Licensing License DPR-20 US Nuclear Regulatory Commission Palisades Plant Washington, DC 20555 A0-75-6 Gentlemen:

Attached is Abnormal Occurrence Report A0-75-6 which covers the release of heated water at a rate which exceeded the Technical Specifications limits. There were no safety implications asscciated with this occurrence.

O)N Yours very truly, Ralph B. Sewell (Signed)

DAB / map Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USNRC h o~p

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.:- O O O ABNORMAL OCCURRENCE REPORT Palisades Plant

1. Report No: A0-75-6, Docket 50-255 2a. Report Date: April 14, 1975 2b. Occurrence Date: April h, 1975 3 Facility: Palisades Plant, Covert, Michigan

h. Identification of Occurrence: Plant discharge effluent heat rate greater than 0.5 billion Etu/ hour.

5 Condition Prior to Occurrence: Plant was operating at about 550 MWt (25% power).

6. Description of Occurrence: From essentially 0500 April 3,1975 to approximately 1300 on April h,1975, the plant was discharging heat at the rate of 1.1h billion Btu / hour from the mixing basin outfall. This discharge rate was the result of diverting dilution water through half of the main condenser which had not been placed in service. Termina-tion of this method of cooling reduced the discharge heat rate to below the Technical Specification limit.

7 Apparent Cause of Occurrence: The cause of this occurrence appears to be associated with plant procedure problems and the beginning operation of our newly installed closed cycle cooling system

8. Analysis of Occurrence: There were no safety implications associated with this occurrence. An analysis of the mixing zone was made using ANL/ES-5 (April 1971) which showed that the mixing zone area was within the limits specified by the Michigan Water Resources Commission NPDES Permit for the plant. In addition, there were no observed adverse effects upon fish and other biological damage is , considered unlikely to have occurred.

9 Corrective Action:

a. The use of dilution water for condenser cooling was terminated.

b. A study of the closed cycle cooling system has been initiated.

This study will include this and other operational problems which have been observed. The results of the study will be available at the plant for review by members of the NRC staff.

10. Failure Data: N/A.

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