| | Site | Start date | Title | Description |
|---|
| ENS 57004 | Nine Mile Point | 4 March 2024 00:42:00 | Automatic Reactor Scram Due to Main Turbine Trip on LOW Condenser Vacuum | The following information was provided by the licensee via email:
On 3/3/24 at 1942 EST, while performing a plant shutdown in preparation for a refuel outage, Nine Mile Point Unit 2 experienced a reactor scram due to a main turbine trip on low condenser vacuum. The plant was at approximately 55 percent power at the time of the reactor scram.
Additionally, following the scram a low RPV (reactor pressure vessel) level scram and containment isolation signal on level 3 was received, as expected. The containment isolation signal impacted RHR (residual heat removal) shutdown cooling, RHR letdown to radwaste, and RHR sampling. All impacted valves were closed at the time the isolation occurred.
All control rods were fully inserted. Plant response was as expected. Post scram, the main turbine bypass valves are being used to control decay heat, and normal post scram level control is via the feed / condensate system.
This is being report under 10 CFR 50.72(b)(2)(iv)(B), 'RPS Actuation', and 10 CFR 50.72(b)(3)(iv)(A), 'Specified System Actuation'.
Unit 1 is not affected. There was no impact on the health and safety of the public or plant personnel.
The NRC Resident Inspector has been notified.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The cause of the low condenser vacuum was a momentary loss of sealing steam. The condenser remained viable for decay heat removal. All safety equipment is available. The grid is stable with the plant in its normal shutdown electrical configuration. |
| ML23286A282 | | 2 February 2024 | Watermarked - DG-5076 - Physical Protection for Part 53 - 10-13-23 | |
| ML23286A268 | | 2 February 2024 | Watermarked - DG-5074 - Access Authorization - Econcurrence Version Clean (02-03-23) | |
| NUREG-2194 Volume 2, Rev. 1, Standard Technical Specifications, Westinghouse Advanced Passive 1000 (AP1000) Plants, Volume 2: Bases | | 31 January 2024 | NUREG-2194, Vol. 2, Rev. 1, Standard Technical Specifications, Westinghouse Advanced Passive 1000 (AP1000) Plants, Volume 2: Bases | |
| IR 05000352/2023004 | Limerick | 31 January 2024 | Integrated Inspection Report 05000352/2023004 and 05000353/2023004 | |
| ML23319A245 | Watts Bar
Sequoyah | 29 January 2024 | Issuance of Amendment Nos. 366 and 360; 164 and 71 Regarding the Adoption of TSTF-567, Revision 1, Add Containment Sump TS to Address GSI-191 Issues | |
| ML24026A301 | 05000611
05000612 | 26 January 2024 | Kairos Power, LLC, Changes to Hermes 2 Preliminary Safety Analysis Report (PSAR) Chapter 7 | |
| ML24025C687 | 05000611
05000612 | 24 January 2024 | Kairos Power LLC, Changes to PSAR Chapter 3 and 9 | |
| IR 05000483/2023004 | Callaway | 19 January 2024 | Integrated Inspection Report 05000483/2023004 | |
| AEP-NRC-2024-01, Emergency Plan Revision 48 | Cook | 8 January 2024 | Emergency Plan Revision 48 | |