ENS 54731

v t e ENS Event
18:03 May 29, 2020
Title	Manual Trip Due to Rod Bank Unexpectedly Inserting
Event Description	At 1403 EDT, with the unit in Mode 1 and 100 percent power, the reactor was manually tripped due to Group 1 of Control Rod Bank 'B' unexpectedly inserting. All systems responded normally post-trip. Operations stabilized the plant in Mode 3 at 557 degrees Fahrenheit. Decay heat removal is being accomplished via the steam dumps in the steam pressure mode to the main condenser. Emergency feedwater actuated due to low low steam generator level as expected. This event is being reported pursuant to 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR (b)(3)(iv)(A). The NRC Senior Resident Inspector has been notified.

ENS 54731 +/-
Where
Seabrook New Hampshire (NRC Region 1)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
Time - Person (Reporting Time:+-1.37 h-0.0571 days <br />-0.00815 weeks <br />-0.00188 months <br />)
Opened:	Jack Connolly 16:41 May 29, 2020
NRC Officer:	Brian P. Smith
Last Updated:	May 29, 2020
54731 - NRC Website
v • d • e

v t e Emergency Notification System
Seabrook with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
WEEKMONTHYEAR2020-06-06T13:20:00 [Table view]
[ENS list for Seabrook]

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