ML052500416
| ML052500416 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/29/2005 |
| From: | O'Connor T Constellation Energy Group |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NMP1L 1979 | |
| Download: ML052500416 (2) | |
Text
Constellation Energy-P.O. Box 63 Lycoming, NY 13093 Nine Mile Point Nuclear Station August 29, 2005 NMP1L 1979 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001
SUBJECT:
Nine Mile Point Unit 1 Docket No. 50-220 Facility Operating 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 Instrumentation 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 ofEvent On August 15, 2005, at 1725 hours0.02 days <br />0.479 hours <br />0.00285 weeks <br />6.563625e-4 months <br />, operators removed Channel #12 of the CHM System from service in anticipation of a water purge cycle solenoid-operated valve (SOV) failure. There was no loss of sampling capability and no loss of Control Room indication prior to securing Channel
- 12 of the CHM System.
The redundant Channel #11 of the CHM System was verified to be operable prior to removal of Channel #12 from service.
Cause of Inoperabiitv Channel #12 of the CHM System was removed from service after identifying that a water purge circuit SOV was degraded due to rattling/vibration. The SOV did not experience a failure that would have prevented its normal operation.
Z Page 2 NMP1L 1979 Actions Taken The SOV was replaced and post maintenance testing was completed satisfactorily. Channel #12 ofthe CHM System was restored to operable status on August 20,2005, at 101 hours0.00117 days <br />0.0281 hours <br />1.669974e-4 weeks <br />3.84305e-5 months <br />.
V tu s,
Ti yJ. O'Connor P1 General Manager TJO/RF/sac Attachment cc:
Mr. S. J. Collins, NRC Regional Administrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector