ENS Event | |
|---|---|
00:48 Oct 23, 2023 | |
| Title | Average Power Range Monitors Declared Inoperable |
| Event Description | The following information was provided by the licensee via phone and email:
On October 21, 2023, at 2048 EDT, reactor recirculation pump (RRP) 12 tripped. The cause for the trip is under investigation. Following the RRP trip, the average power range monitors (APRMs) flow bias trips were inoperable due to reverse flow through RRP 12. The APRMs were restored to operable on October 21, 2023, at 2058 EDT, when the RRP 12 discharge blocking valve was closed. This 8-hour non-emergency report is being made based upon requirements of 10CFR50.72(b)(3)(v)(A) which states: "Licensee shall notify the NRC of any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to: (A) Shut down the reactor and maintain it in a safe shutdown condition." The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Nine Mile Point  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor | |
| Time - Person (Reporting Time:+-23.08 h-0.962 days <br />-0.137 weeks <br />-0.0316 months <br />) | |
| Opened: | Conor Henrie 01:43 Oct 22, 2023 |
| NRC Officer: | John Russell |
| Last Updated: | Oct 22, 2023 |
| 56810 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 568102023-10-23T00:48:00023 October 2023 00:48:00
[Table view]10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Average Power Range Monitors Declared Inoperable ENS 551372021-03-13T02:02:00013 March 2021 02:02:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Reactor Recirculation Pump Trip ENS 541992019-08-04T21:45:0004 August 2019 21:45:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Average Power Range Monitors Declared Inoperable ENS 486962013-01-23T20:16:00023 January 2013 20:16:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Concurrent Loss of High Pressure Reactor Makeup Systems Capability ENS 402172003-10-03T01:00:0003 October 2003 01:00:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Loss of Safe Shutdown Capability Due to All Oprm Channels Being Declared Inoperable. 2023-10-23T00:48:00 | |