ML20085F976

AO 75-012:on 750603,required Measurements & Observations Re Closed Cycle Condenser Cooling Sys Chlorination Treatment Not Performed.Caused by Incorrectly Conceived Tech Specs

ML20085F976
Person / Time
Site:	Palisades
Issue date:	06/13/1975
From:	Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20085F981	List: ML20085F976 ML20085F996
References
AO-75-012, AO-75-12, NUDOCS 8308230702
Download: ML20085F976 (3)

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Directorate of Licensing Re: Docket 50-255 US Nuclear Regulatory Commission License DPR-20 Washington, DC 20555 Palisades Plant - A0-12-75 Gentlemen:

Attached is Abnormal Occurrence Report AO-12-75 which des-cribes deficiencies associated with chlorination treatment of the closed cycle condenser cooling system. There were no safety implica-tions associated with this occurrence.

Yours very truly, Ralph B. Sewell (Signed)

DAD /ds Ralph B. Sewell Nuclear I,1 censing Administrator CC: JGKeppler, URNRC

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ABNORMAL OCCURRENCE REPORT Palisades Plant

1. Report No: A0-12-75, rocket 50-255

2. a. Report Date: June 13,1975

b. Occurrence Date: June 3, 1975 (Designated as Abnormal Occurrence) 3 Facility: Palisades Plant, Covert, Michigan

4. Identification of Occurrence: Failure to perform required measurements and observationa associated with chlorination treatment of the closed cycle condenser cooling system.

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5 Conditions Prior to Occurrence: Plant was eperating at steady-state power.

6. Description of Occurrence: A review of our chlorination treatment of the closed cycle condenser cooling system showed that the following require-ments of Technical Specifications 3 9.6 through 3 910 were not consistently met and that in a few cases appropriate measurements or observations were

, never taken. These requirements are:

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a. Chlorine discharge into Lake Michigan shall not exceed 0.02 ppm (T.S. 3 9.6).

b.

Records of the following quantities for each treatment shall be kept (T.S. 3 9.8).

(1) Total quantity of chlorine compound used.

(2) The cooling tower blowdown rate.

(3) The dilution blow rate.

(4) Time of holdup of blowdown to allow chemical decomposition.

c. Sampling of the blowdown water for chlorine prior to dilution (T.S. 3 9 9).

d. Observation of detrimental effects due to chlorine on aquatic life (T.S. 3 9.10).

7 Designation of the Apparent Cause of Occurrence: When the present Technical Specifications were conceived, chlorine discharge to the lake was considered to be that blowdown which occurred through the " blowdown piping." This path can be controlled and terminated if desired. Recently, it has been deternined that some cooling tower water is mixing or diffusing from the pump basin into the makeup basin and, consequently, discharged over the weir into the mixing basin and lake. Originally, this discharge was

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makeup discharge is a combination of both excess service water and cool-ing tower water. I Because this path for discharging chlorine was not originally recognized, measurements of the discharge were not made. Measurements now indicate 1 that the lake discharge average was about 0.01 ppm (total Cl) which is within 0.02 ppm limit for total chlorine. However, the maximum could have reached as much as 0.06 ppm (total Cl). This limit is still significantly below the NPDES permit limit of 0.5 mg/1.

Failure to meet other requirements associated with chlorination treatment of the closed cycle condenser cooling system appear to be associated with plant procedure problems and the beginning operation of our newly in-stalled closed cycle cooling system.

8. Analysis of Occurrence: There were no safety implications associated with this occurrence.

9 Corrective Action: Procedures are being formulated and will be instituted to insure that the Technical Specifications Requirements of 3 9.6 through 3 9.10 vill be met during the chlorination treatment of the closed cycle cooling system. While (as a part of tnis review) it was also found that certain flow and other measurements are inadequate (this topic will be the

,-~s subject of a special letter report to follow), we vill insure that the

( chloride discharge limits to the lake vill not exceed the limit of 0.02

\-' ') ppm by making appropriate conservative assumptions of the various flow rates. In addition, we are considering Technical Specifications changes which would revise the current chlorine limit to directly correspond with the NPDES permit requirement.

10. Failure Data: See also lear to follow discussing deficiencies relatea to the environmental monitoring program.

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