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The following information was provided by … The following information was provided by the licensee via fax:</br>(On 09/27/2023) at 1041 CDT, with the plant at 75 percent power and main turbine control valve testing in progress, a reactor pressure transient resulted in a reactor steam dome high pressure scram and subsequent group 1 primary containment isolation of the main steam lines (MSL). All main steam isolation valves closed as a result of the group 1 isolation signal. Additionally, a group 2 containment isolation signal was received due to reactor pressure vessel (RPV) level less than plus 9 inches during the transient. Operations personnel responded and stabilized the plant. The high-pressure coolant injection (HPCI) system was placed in service to control RPV pressure. HPCI did not inject into the RPV and was not needed to control RPV water level. The cause of the initial pressure transient is under investigation.</br>The NRC Resident Inspector has been notified.</br>***UPDATE ON 9/27/2023 AT 2350 EDT FROM NATHAN PIEPER TO LAWRENCE CRISCIONE***</br>The utility notified the State of Minnesota and Wright and Sherburne counties.</br>Notified R3DO (Orlikowski)burne counties.
Notified R3DO (Orlikowski) +
15:41:00, 27 September 2023 +
56,759 +
15:28:00, 27 September 2023 +
15:41:00, 27 September 2023 +
The following information was provided by … The following information was provided by the licensee via fax:</br>(On 09/27/2023) at 1041 CDT, with the plant at 75 percent power and main turbine control valve testing in progress, a reactor pressure transient resulted in a reactor steam dome high pressure scram and subsequent group 1 primary containment isolation of the main steam lines (MSL). All main steam isolation valves closed as a result of the group 1 isolation signal. Additionally, a group 2 containment isolation signal was received due to reactor pressure vessel (RPV) level less than plus 9 inches during the transient. Operations personnel responded and stabilized the plant. The high-pressure coolant injection (HPCI) system was placed in service to control RPV pressure. HPCI did not inject into the RPV and was not needed to control RPV water level. The cause of the initial pressure transient is under investigation.</br>The NRC Resident Inspector has been notified.</br>***UPDATE ON 9/27/2023 AT 2350 EDT FROM NATHAN PIEPER TO LAWRENCE CRISCIONE***</br>The utility notified the State of Minnesota and Wright and Sherburne counties.</br>Notified R3DO (Orlikowski)burne counties.
Notified R3DO (Orlikowski) +
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