ENS 57822

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v t e ENS Event
19:10 Jul 22, 2025
Title	Manual Reactor Scram
Event Description	The following information was provided by the licensee via phone and email: At 1510 [EDT] with Unit 1 in mode 1 at 96 percent reactor power, the reactor was manually scrammed due to loss of main transformer cooling. The scram was not complex, all systems responded normally post-scram. Main turbine bypass valves opened automatically to maintain reactor pressure. Operations responded to stabilize the plant. High pressure coolant injection momentarily injected into the reactor vessel and was subsequently placed in standby. Reactor water level has stabilized and is being maintained with the '1B' reactor feed pump. Decay heat is being removed by discharging steam to the main condenser using the turbine bypass valves. Unit 2 was not impacted. Due to the reactor protection system actuation while critical and the emergency core coolant system discharge to the reactor coolant system, this event is being reported as a four-hour and eight-hour non-emergency notification per 10 CFR 50.72(b)(2)(iv)(B), 10 CFR 50.72{b){2)(iv)(A), and 10 CFR 50.72(b)(3)(iv)(A). The Unit 1 reactor is currently stable in mode 3. An investigation is in progress into the cause of the loss of main transformer cooling. There was no impact to the health or safety of the public or plant personnel. The NRC Resident Inspector has been informed. The state of Pennsylvania has been informed.

ENS 57822 +/-
Where
Susquehanna Pennsylvania (NRC Region 1)
Reporting

10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation
LER:	05000387/LER-2025-001 Manual Reactor Scram Following Partial Loss of Cooling to Main Transformer 05000387/LER-2025-001-01 (SSES) Unit 1 Manual Reactor Scram Following Loss of Cooling to Main Transformer
Time - Person (Reporting Time:+-1.8 h-0.075 days <br />-0.0107 weeks <br />-0.00247 months <br />)
Opened:	Ken Hulbert 17:22 Jul 22, 2025
NRC Officer:	Brian P. Smith
Last Updated:	Jul 22, 2025
57822 - NRC Website Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 57822\u003C/a\u003E - \u003Ca href=\"/Susquehanna\" title=\"Susquehanna\"\u003ESusquehanna\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EManual Reactor Scram\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 57822 - Susquehanna\n","link":"","lat":41.09256666666667,"lon":-76.14176944444445,"icon":"/w/images/c/c7/Talen_Energy_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Susquehanna with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge
WEEKMONTHYEAR2025-07-22T19:10:00 [Table view]
[ENS list for Susquehanna]

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