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    NRC Issues Event Notification for Monticello Nuclear Plant, Minn.


    May 17, 2022 - Targeted News Service

     

      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."

      Power Reactor

      Event Number: 55896

      Facility: Monticello

      Region: 3

      State: MN

      Unit: [1] [] []

      RX Type: [1] 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

      Person (Organization):

      Skokowski, Richard (R3DO)

      Table omitted: https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2022/2...

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