ML20085F509

AO AO-3-75:on 750122,leak in Component Cooling Water to Svc Water Header Discovered.Cause Not Stated.Leak Developed 750116.Leaking Tube Plugged

ML20085F509
Person / Time
Site:	Palisades
Issue date:	02/04/1975
From:	Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085F507	List: ML20085F506 ML20085F509
References
AO-3-75, NUDOCS 8308220159
Download: ML20085F509 (2)

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     . 1             General Offices: 212 West Michigan Avenue. Jackson Michigan 49201. Area Code S17 788-0550 February I, 1975 4
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                                                                                ,          Docket 50-255 Office  of Nuclear    Reactor      Regulat o/gj87 7                            License DPR-20 US Nuclear  Regulatory    Commission                            ci G         Palisades Plant Washington, DC 20555                                                           A0-3-75 Gentlemen:

Abnormal Occurrence Report No A0-3-75 describes the component cooling water tube leak. This leak resulted in a small uncontrolled \, release of radioactive material from the site boundary. Yours very truly, Ralph B. Sewell (Signed) WGF/ map Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USNRC 0300220159 750126 PDRADOCK05000g S ~] lUUi:

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ABNORMAL OCCURRENCE REPORT Docket 50-255

1. Report No: A0-3-75 2a. Report Date: February h, 1975 2b. Occurrence Date: January 22, 1975 3 Facility: Palisades Plant, Covert, Michigan

4. Identification of Occurrence: Component ecoling water leak to the service water header (uncontrolled release of ' radioactive material from the site boundary).

5 Conditions Prior to Occurrence: Plant in cold shutdown.

6. Description of Occurrence: On January 21, it was suspected that there might be a component cooling water leak. On January 22, the "A" com-ponent cooling water heat exchanger was isolated. On January 23, the "A" CCW heat exchanger was placed in service and the leak rate was determined to be one percent per hour of the CCW surge tank volume.

The "A" CCW heat exchanger was again isolated'. I 7 Designation of Apparent Cause of Occurrence: The occurrence appears to be an isolated event.

8. Analysis of Occurrence: On January 24, it was determined that one tube was leaking. A plot of the CCW surge tank level showed the leak to have developed on January 16. It was calculated that 5 45 x 103 liters of component cooling water had been released via the service water discharge header. The amount of activity released was 0.003 millicurie of cobalt-60 and 0 975 millicurie of tritium.

l 9 Corrective Action: On January 25, the tube was plugged and a leak rate test run at greater than 110 percent of the normal maximum operation pressure. No leakage was observed.

10. Failure Data: Two identical heat exchangers are in use at the plant; one heat exchanger (A) has 32 tubes plugged and the other (B) has 21 l tubes plugged.

The heat exchangers were manufactured by Industrial Process Engineering. O, s G'

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