ML051540036
ML051540036 | |
Person / Time | |
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Site: | Nine Mile Point ![]() |
Issue date: | 05/24/2005 |
From: | Godley R Constellation Energy Group |
To: | Document Control Desk, Office of Nuclear Reactor Regulation |
References | |
NMP1L 1953 | |
Download: ML051540036 (2) | |
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Category:Letter
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Spec ML18094A0291978-01-13013 January 1978 LER 1978-001-00 for Nine Mile Point Station Unit 1 Re Delta Temperature of Discharge Water Exceeded Specification 2.1.5 of Environmental Tech Specs ML18018B1361977-07-21021 July 1977 LER 77-032-00 for Nine Mile Point Unit 1 Regarding a Water Phase Material Sample in the Reactor Vessel Inspection Lapse During Refueling ML18018B1421977-07-14014 July 1977 LER 77-029-00, 77-030-00, 77-031-00, 77-034-00, & 77-035-00 for Nine Mile Point Unit 1 Low-Low-Low Level Set Point Out of Specs on RE-18A, Vacuum Switch Trip & Reset Point on Torus Relief Valves Out of Specs, Weld Leak in Emergency Condense 2018-01-18 |
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Constellation Energye P.O. Box 63 Lycoming, NY 13093 I Nine Mile Point Nuclear Station May 24, 2005 NMP1L 1953 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
SUBJECT:
Nine Mile Point Unit 1 Docket No. 50-220 License No. DPR-63 Special Report, Channel #11 of the Containment Hydrogen Monitoring System Inoperable for Scheduled Preventive Maintenance 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 #11 of the Containment Hydrogen Monitoring (CHM) System.
Descriptionof Event On May 11, 2005, at approximately 12:57 hours, operators declared Channel #11 of the CHM System inoperable to perform scheduled preventive maintenance.
The redundant Channel #12 was verified to be operable prior to removal of Channel #11 from service.
Cause of Inoperability Channel #11 of the CHM System was removed from service to support scheduled preventive maintenance on the circuit breaker that supplies power to the sample and bypass pumps and the analysis and bypass cabinet heaters.
NMP1L 1953 Page 2 Actions Takens The circuit breaker preventive maintenance was completed and Channel #11 of the CHM System was restored to operable status on May 12, 2005, at approximately 05:07 hours.
Very truly yours, Robert C. Godley Manager Operatiof RCG/RF/sac cc: Mr. S. J. Collins, NRC Regional Administrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector