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NRC Issues Event Notification for Millstone in Connecticut

  • Nov 19, 2021
Targeted News Service

WASHINGTON, Nov. 15 -- The Nuclear Regulatory Commission issued the following event notification (No. 55576) involving Millstone, Connecticut:


"On November 14, 2021, at 1150 EST, while operating in Mode 1 at 100 percent power, the supply check valve from the Number 2 steam generator to the turbine driven auxiliary feedwater pump was determined during troubleshooting that it is not able to perform its isolation function. This failure would have resulted in the blowdown of both steam generators during a main steam line break in the Number 2 steam generator main steam line upstream of the main steam isolation valves until the operators could isolate the faulted steam generator. Previous evaluation has determined that this condition constituted an unanalyzed condition that could impact containment pressure.

"There has been no radioactive release to the environment. The steam lines from the steam generators to the turbine driven auxiliary feedwater pump have been isolated by use of a motor operated valve in the discharge line of the Number 2 steam generator. There has been no impact to Unit 3 which remains at 100 percent power.

"The NRC Senior Resident has been notified.

"This condition is being reported pursuant to 10 CFR 50.72(b)(3)(ii)(B) as a condition that resulted in the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety."

Power Reactor

Event Number: 55576

Facility: Millstone

Region: 1

State: CT

Unit: [2] [] []

RX Type: [1] GE-3,[2] CE,[3] W-4-LP

NRC Notified By: Sunyoung Kwon

HQ OPS Officer: Donald Norwood

Notification Date: 11/14/2021

Notification Time: 17:06 [ET]

Event Date: 11/14/2021

Event Time: 11:50 [EST]

Last Update Date: 11/14/2021

Emergency Class: Non Emergency

10 CFR Section:

50.72(b)(3)(ii)(B) - Unanalyzed Condition

Person (Organization):

Henrion, Mark (R1)

Table omitted:

Spell checking: Press the CTRL or COMMAND key then click on the underlined misspelled word.
Bob Meinetz's picture
Bob Meinetz on Nov 19, 2021


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