ML18064A543
| ML18064A543 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 01/03/1995 |
| From: | Vincent R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9501090239 | |
| Download: ML18064A543 (2) | |
Text
Palisades Nuclear Plant: 27780 Blue Star Memorial Highway, Covert. Ml 49043 January 3, 1995 Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT REPORT REQUIRED BY OFFSITE DOSE CALCULATION MANUAL APPENDIX A On December 1, 1994, the Palisades Radiological Gaseous Effluent Monitor (RGEM) was declared inoperable.
RGEM is the monitor for the Plantrs stack gas effluent. This monitor became inoperable when the sampler flow rate monitor, FE-2346 failed its 18 month calibration test as required by the Offsite Dose Calculation Manual (ODCM) Appendix A, Table A-2.
This report is being submitted because the RGEM system was not restored to operable status within the seven day requirement per the ODCM Appendix A, Table A-1 item 3.d Action statement.
Description The Palisades Stack Gas Effluent System (RGEM), consists of the following channels: Noble Gas Activity Monitor, RIA-2326; Iodine/Particulate/Sampler/
Monitor RIA-2325; Sampler Flow Rate Monitor FE-2346; and Hi Range Noble Gas Monitor RIA-2327.
On December 1, 1994, Technical Specification Surveillance Procedure RR-84D, "Radiological Gaseous Effluent Sampler Flow Rate Calibration" was performed.
During this test, the RGEM sample flow rate monitor, FE-2346 did not respond to input changes per test requirements.
Troubleshooting revealed that the sample flow valve control gears for FE-2346 were badly worn and disengaged.
The set screw that holds the large gear on the shaft had loosened, which caused excessive gear deflection and wear.
With these gears disengaged, FE-2346 could not respond to input changes per RR-84D test conditions. A condition report (C-Pal-94-1099) was initiated and the entire RGEM sampling system was declared inoperable.
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Repla~ement sample flow valve control gears are not stocked on site and were not immediately available from the Vendor.
Replacement gears were not received in time to restore the system to operation within the seven day time requirement.
Monitoring Requirements 2
Palisades ODCM Appendix A, Table A-1, item 3(a-d) details the sampling/analysis actions required when the RGEM system is inoperable.
Each channel has specific required actions, and although only FE-2346 was not functioning properly, the entire system was declared inoperable. During this period of inoperability, all the required sampling/analysis, flow estimations, and alternate method of monitoring were implemented and completed in a timely manner.
Also during this period, the RGEM unit (although declared inoperable) continued to provide its design function to sample/analyze Noble Gas, Iodine, and Particulate on a continuous basis. With the sample flow rate monitor (FE-2346) gears removed this unit still maintained a near isokenetic sample collection rate of approximately 1.60 cfm.
Corrective Actions The RGEM unit was restored to service on December 22, 1994.
Replacement sample flow gears were ordered and installed, and the RGEM Sampler Flow Rate calibration (RR-84D) was successfully completed.
All the sampling/analysis requirements by ODCM Appendix A Table A-1 action statements were completed in the time periods specified.
Summary of Commitments No new commitments are identified in this letter.
Robert A Vincent Licensing Administrator CC Administrator, Region III, USNRC Project Manager, USNRC NRG Resident Inspector, Palisades