NMP1L3589, Special Report: Containment High Range Radiation Monitor Instrumentation Channel 12 Inoperable
| ML24192A121 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 05/16/2024 |
| From: | Tryt N Constellation Energy Generation |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NMP1L3589 | |
| Download: ML24192A121 (1) | |
Text
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NMP1L3589 May 16, 2024.
U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Nine Mile Point Nuclear Station, Unit 1 Renewed Facility Operating License No. DPR-63 Docket No. 50-220 Technical Specifications
Subject:
Special Report: Containment High Range Radiation Monitor Instrumentation Channel #12 Inoperable In accordance with Action 3 of Nine Mile Point Unit 1 (NMP1) Technical Specification (TS) Table 3.6.11-2, "Accident Monitoring Instrumentation Action Statements," Nine Mile Point Nuclear Station, LLC (NMPNS) is submitting the following Special Report concerning inoperability of Containment High Range Radiation Monitor Instrumentation Channel #12.
Description of Event On May 7, 2024, at 1359, the Channel #12 Containment High Range Radiation Monitor was declared inoperable. During replacement of a power supply for Unit 1 Stack Gas Radiation Monitor, a short to ground caused a fuse to blow for RPS bus 12 circuit 4. This resulted in loss of power to the Unit 1 Containment High Range Radiation Monitor Instrumentation Channel
- 12.
The redundant channel of Containment High Range Radiation Monitor Instrumentation, Channel #11, was operable during the period Channel #12 was inoperable.
Cause of lnoperability The cause of the inoperability was the loss of power.
NMP1 Special Report May 16, 2024 Page2 Action Taken The condition was entered into the station's corrective action program under IR 04772638.
Maintenance technicians replaced the fuse. Operability was restored on May 7, 2024, at 2351.
Should you have any questions regarding the information in this submittal, please contact Brandon Shultz, Mgr. Site Regulatory Assurance, at (315) 349-7012.
Sincerely, Tr t N i Ch O I a S A.~ D~tally signed by Tryt, Nicholas y I
- t--~e
- 2024.05.14 17:40:34-04'00' For Carl Crawford Plant Manager, Nine Mile Point Clean Energy Center CJC/MLR cc:
NRC Regional Administrator, Region I NRC Senior Resident Inspector NRC Project Manager