ML20085F796
| ML20085F796 | |
| 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 |
| Shared Package | |
| ML20085F802 | List: |
| References | |
| AO-75-016, AO-75-16, NUDOCS 8308230301 | |
| Download: ML20085F796 (2) | |
Text
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Company cenerai ove.ce. aim west u.chigan Avenue. Jackson, Michsgan 49301 o' Area Code 517 788-OSSO August 12, 1975
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Division of Reactor Licensing US Nuclear Regulatory Commission
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Washington, DC 20555
'11' j_M DOCKET 50-255, LICENSE DPR-20 A0-75-16, REV 1 On August 14, 1975, we submitted a report on Abnormal Occurrence A0-75-16 covering the release of radwaste in excess of the permissible discharge rate.
A review of this report has disclosed a number of errors which should be corrtec ted.
The attached report (Rev 1) replaces the previously submitted report in its entirety.
O David A. Bixel (Signed)
David A. Bixel Assistant Nuclear Licensing Administrator CC: JGKeppler, USNRC File
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8308230301 750812 c2 PDR ADOCK 050002S5 S
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ABNORMAL OCCURRENCE REPORT Palisades Plant 1.
Report No: AO-75-16 2a.
Report Date: August 4, 1975 (Rev 1, August 12, 1975) 2b.
Occurrence Date: July 22, 1975 3
Facility: Palisades Nuclear Plant, Covert, MI 4.
Identification of Occurrence: Exceeding radwaste batch discharge rate.
5 Conditions: Steady state power 80 percent.
6.
Description of Occurrence: Radwaste Batch 75-021 R was authorized for release at no more than 70 gpm (based on a calculated value of 84.7 gpm).
The operator set the flow controller FIC 1050 (a three-inch control valve) at 40 gpm for the 5,000 gallon release. While checking the release about i
45 minutes later, the operator noted that the pump had just lost suction indicating that the tank was nearly empty. A calculation based on the elapsed time indicated that the release had occurred at 102.2 gpm. The Shift Supervisor and Radicactive Material Control (RMC) were notified.
RMC calculated the release at 1.19 MPC. Grab samples were obtained from
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the lake both north and south of the release point; however, no detect-able activity was found. A sample of the released effluent was sent to an independent laboratory for a refined analysis. The results of this analysis are expected about the middle of August 1975 7
Designation of Apparent Cause: The flow controller FIC 1050 lost water in one of its reference legs resulting in inaccurate flow control.
8.
Analysis of Occurrence: This occurrence was associated with an equipment malfunction and involved the release of 211.6 millicuries of activity.
Samples taken in the lake near the point of release showed no detectable activity.
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Corrective Action: Radwaste release procedures have been changed to re-quire that the zero point on the flow control be verified to plus or minus 5 percent prior to the start of a release. Since two release paths are available (a one-inch and a three-inch line), the procedures have also been changed to require the use of the one-inch line for release rates that are under 100 gpm.
10.
Failure Data: The tendency to lose the water in one of the flow con-troller reference legs is a continuing problem with this system due to the negative pressure at the flow controller location caused by the drop i
in elevation between the flow control point and the release point. We conclude that the procedural changes instituted will make a reoccurrence v,
of this occurrence unlikely.
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