ENS 55616

From kanterella

Revision as of 15:03, 4 January 2024 by StriderTol (talk | contribs) (StriderTol Bot change)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Jump to navigation Jump to search

v t e ENS Event
17:54 Nov 30, 2021
Title	Unit 1 Automatic Scram
Event Description	At 1254 EST on November 30, 2021, Susquehanna Steam Electric Station Unit 1 reactor automatically scrammed during Turbine Valve Cycling surveillance activities. Unit 1 reactor was being operated at approximately 80 percent rated thermal power with turbine valve cycling surveillance activities in progress. The Control Room received indication that both divisions of RPS [reactor protection system] actuated from turbine valve closure signals and all control rods fully inserted. The Main Turbine was manually tripped, and turbine bypass valves opened automatically to control reactor pressure. Reactor water level lowered to -35 inches causing Level 3 and Level 2 isolations. No ECCS [emergency core cooling systems] actuations occurred. RCIC [reactor core isolation cooling] automatically initiated as designed at -30 inches. The Operations crew subsequently maintained reactor water level at the normal operating band using Feedwater pumps and RCIC was placed in a standby lineup. The reactor is currently stable in Mode 3. An investigation is in progress into the cause of the turbine valve closure signals. The NRC Senior Resident Inspector was notified. A voluntary notification to PEMA [Pennsylvania Emergency Management Agency] will be made. This event requires a 4-hour ENS notification in accordance with 10CFR50.72(b)(2)(iv)(B) and an 8-hour ENS notification in accordance with 10CFR50.72(b)(3)(iv)(A). Unit 2 was not affected and remains at 100 percent power, Mode 1.

ENS 55616 +/-
Where
Susquehanna Pennsylvania (NRC Region 1)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation
LER:	05000387/LER-2021-005 Automatic Reactor Scram Due to Turbine Control Valve Fast Closure 05000387/LER-2021-005-01 Automatic Reactor Scram Due to Turbine Control Valve Fast Closure
Time - Person (Reporting Time:+-1.53 h-0.0638 days <br />-0.00911 weeks <br />-0.0021 months <br />)
Opened:	Tom Rydzewski 16:22 Nov 30, 2021
NRC Officer:	Karen Cotton-Gross
Last Updated:	Nov 30, 2021
55616 - 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 55616\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\u003EUnit 1 Automatic Scram\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 55616 - 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
WEEKMONTHYEAR2023-03-23T21:36:00 [Table view]
[ENS list for Susquehanna]

Retrieved from "https://kanterella.com/w/index.php?title=ENS_55616&oldid=3645481"