ENS 56790
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ENS Event | |
|---|---|
01:27 Oct 13, 2023 | |
| Title | Manual Reactor Trip |
| Event Description | The following information was provided by the licensee via email:
On 10/12/23 at 2127 EDT, with the Unit 1 in Mode 1 at 100% Power, operators identified degrading condenser vacuum and manually tripped the reactor. All control rods inserted as expected. The trip was not complex, and all systems responded normally post-trip. The cause of the degraded condenser vacuum was an unexpected closure of the condenser air ejector regulator. The cause of the air ejector regulator going closed is not fully understood and is being investigated. Following the SCRAM, Operators responded and stabilized the plant. Decay heat is being removed by the Main Steam System through the Atmospheric Relief Valves (ARVs) and Auxiliary Feed Water (AFW) systems. Due to the Reactor Protection System (RPS) actuation while critical, this event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B) and an eight-hour non-emergency notification per 10 CFR 50.72(b)(3)(iv)(A) for a valid specified system actuation. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Ginna  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-1.93 h-0.0804 days <br />-0.0115 weeks <br />-0.00264 months <br />) | |
| Opened: | Gabe Kiever 23:31 Oct 12, 2023 |
| NRC Officer: | Lawrence Criscione |
| Last Updated: | Oct 12, 2023 |
| 56790 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (100 %) |
| After | Hot Standby (0 %) |
Ginna with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 567902023-10-13T01:27:00013 October 2023 01:27:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip ENS 567312023-09-09T15:43:0009 September 2023 15:43:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip ENS 555042021-10-04T04:31:0004 October 2021 04:31:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Valid System Actuation ENS 536962018-10-26T04:00:00026 October 2018 04:00:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Automatic Start of the Emergency Diesel Generator and Loss of Radiation Monitor ENS 517302016-02-12T04:05:00012 February 2016 04:05:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Emergency Diesel Generator Auto-Started Due to the Loss of a Station Service Transformer ENS 492142013-07-24T18:19:00024 July 2013 18:19:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip from Full Power ENS 479882012-06-03T06:39:0003 June 2012 06:39:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Autostart of "B" Edg Due to Loss of Offsite Power Circuit 767 ENS 473382011-10-12T03:28:00012 October 2011 03:28:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Turbine Auto Stop Valve Closure ENS 469172011-06-03T04:39:0003 June 2011 04:39:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unexpected Emergency Diesel Generator Actuation ENS 432432007-03-17T02:09:00017 March 2007 02:09:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Caused by Safety Injection Signal ENS 431282007-01-28T01:40:00028 January 2007 01:40:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Loss of Load Transient Caused by Ehc Problem ENS 417652005-06-10T17:51:00010 June 2005 17:51:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Loss of Offsite Bus Due to a Lighting Strike with Actuation of Emergency Diesel Generator ENS 415582005-04-01T19:02:0001 April 2005 19:02:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Emergency Diesel Generator Start Due to a Partial Loss of Offsite Power ENS 414142005-02-17T02:12:00017 February 2005 02:12:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Trip Due to Turbine Trip as a Result of Failed Power Supply ENS 403192003-11-13T14:54:00013 November 2003 14:54:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Auto Start and Loading of the "B" Emergency Diesel Generator ENS 402482003-10-15T14:24:00015 October 2003 14:24:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation a Manual Reactor Trip from 1% Power as Per Abnormal Operating Procedures Occurred 2023-09-09T15:43:00 | |
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