ML20085F772

AO 75-017:between 750718-28,waste Gas Decay Tank T 101C Lost Pressure.Probably Caused by Small Valve Leak.Tank Will Be Monitored During Next Period of Use Since Tests Did Not Determine Pressure Drop Cause

ML20085F772
Person / Time
Site:	Palisades
Issue date:	08/12/1975
From:	Bixel D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Office of Nuclear Reactor Regulation
References
AO-75-017, AO-75-17, NUDOCS 8308230183
Download: ML20085F772 (2)

Text

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@ D VJ U General Offices. 212 West Michigan Aven;e, Jackson. Michsgan 49201

• Area Code S17 788-0550 August 12, 1975 9 R h

Division of Reactor Licensing p~

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Washington, DC 20555 " gore e . , ,

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A0-75-17 g d Attached is the abnormal occurrence report covering the release of gaseous vaste with a shorter than permissible holdup period. No activity limits were violated.

David A. Bixel (Signed)

David A. Bixel Assistant Huclear Licensing Administrator CC: JGKeppler, USNBC File fd + b'%,'

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_ ABNORMAL OCCURRENCE REPORT Palisades Plant

1. Report No: A0-75-17

2. a. Report Date: August 12, 1975

b. Occurrence Date: July 29,1975 (Classified as an AO).

3 Facility: Palisades Nuclear Plant, Covert, MI.

4.

Identification of Occurrence: Gaseous vaste release with a shorter than permissible holdup period.

5 Conditions: Steady state power 80 percent.

6. Description of Occurrence: Waste gas decay tank T 101C lost 4 pounds of pressure on 7/18/75 and 5 pounds of pressure on 7/28/75 Both pressure drops occurred over approximately 8-hour periods. In addition, gradual pressure drop of 2 pounds occurred over the 10-day period between 7/18/75 and 7/28/75 There were no vaste gas system operations being conducted which could be associated with the loss in pressure, f)

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7 Designation of Apparent Cause: Although a thorougn investigation proved inconclusive, a small valve leak is considered to be the most probable cause.

8. Analysia of Occurrence: The total gaseous loss represented less than 1%

of the allowable yearly average limit. The pressure drop was reported in a timely manner and in accordance with plant procedures.

9 Corrective Action: The following tests or checks were performed in an effort to determine the cause of the pressure drop.

a. The pressure transmitter calibration was verified.

b. The tank was checked for the presence of significant quantities of water and none was found.

c. All valve bonnet bolting was checked.

d.

Solenoid Valve SV-1162 and associated drain Valve CV-ll62 B vere checked with no apparent problem being observed.

Since we were unable to determine the cause of the pressure drop, the Radio-active Materials Control Department vill provide special monite-ing of this tank during its next period of use.

f} 10. Failure Data: Not applicable. 1 LJ 1