ML053480205
| ML053480205 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 12/02/2005 |
| From: | O'Connor T Constellation Energy Group |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NMP1L 2006 | |
| Download: ML053480205 (2) | |
Text
Coniteliation Energy P.O. Box 63 Constellation
'Lycoming, NY 13093
- Nine Mile Point Nuclear Station December 2, 2005 NMP1L 2006 U. S. Nuclear Regulatory Commission Attn: Documeni Control Desk Washington, DC 20555-0001
SUBJECT:
Nine Mile Point Unit 1 Docket No. 50-220 License No. DPR-63 Special Report, Channel #12 of the Containment Hydrogen Monitoring System Inoperable Gentlemen:
In accordance with Action 4.a of Nine Mile Point Unit 1 Technical Specification Table 3.6.11-2, "Accident Monitoring~nstrumentation Action Statements," Nine Mile Point Nuclear Station, LLC, is submitting the following Special Report concerning inoperability of Channel #12 of the Containment Hydrogen Monitoring (CHM) System.
Description of Event On November 18, 20 0, at 0819 hours0.00948 days <br />0.228 hours <br />0.00135 weeks <br />3.116295e-4 months <br />, operators declared Channel #12 of the CHM System inoperable to performed surveillance testing. On November 18, 2005, at 1358 hours0.0157 days <br />0.377 hours <br />0.00225 weeks <br />5.16719e-4 months <br />, Channel #12 ogthe qfiM System failed the surveillance test and remained inoperable.
The redundant Channel #11 was verified to be operable prior to declaring Channel #12 inoperable.
Cause of Inoperabiitv Channel #12 of the CHM System was removed from service to perform scheduled surveillance testing. The surveillance test failed due to a shorted diode in the hydrogen sensor circuit.
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Page 2 NMP1L 2006 Actions Taken The diode and the associated fuse in the hydrogen sensor circuit were replaced. Post maintenance and surveillance testing were performed satisfactorily and Channel #12 of the CHM System was restored to operable status on November 30, 2005, at 1105 hours0.0128 days <br />0.307 hours <br />0.00183 weeks <br />4.204525e-4 months <br />.
Should you have any questions regarding this submittal, please contact JE Licensing, at (315) 349-1041.
4i Director TJO/RF/sac cc:
Mr. S. J. Collins, NRC Regional Administrator, Region I Mr. L. M. Cline, NRC Senior Resident Inspector