WASHINGTON, May 17 -- The Nuclear Regulatory Commission issued the following event notification (No. 55896) involving Monticello Nuclear Plant, Minnesota:
CONTROL ROOM ENVELOPE INOPERABLE
The following information was provided by the licensee via email:
"On 5/13/22 at 1111 CDT the station entered LCO 3.7.4 Condition B for Control Room Envelope being inoperable. This was due to results from an inspection in the Steam Jet Air Ejector room that identified steam leakage exceeding the leakage rate assumptions made in the Alternate Source Term (AST) dose analysis calculation. Therefore, this is being reported in accordance with 10CFR50.72(b)(3)(ii)(B) for an unanalyzed condition that significantly degrades plant safety and 10CFR50.72(b)(3)(v)(D) for any event or condition that at the time of discovery could have prevented fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident.
"There is no impact to the health and safety of the public. NRC Resident has been notified."
Event Number: 55896
Unit:   
RX Type:  GE-3
NRC Notified By: Robert Baldwin
HQ OPS Officer: Brian Lin
Notification Date: 05/13/2022
Notification Time: 17:47 [ET]
Event Date: 05/13/2022
Event Time: 11:11 [CDT]
Last Update Date: 05/13/2022
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(3)(ii)(B) - Unanalyzed Condition
50.72(b)(3)(v)(D) - Accident Mitigation
Skokowski, Richard (R3DO)
Table omitted: https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2022/2...