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On Saturday, September 20, 2008, Monticell … On Saturday, September 20, 2008, Monticello Nuclear Generating Plant (MNGP) experienced an actuation of the following systems: Reactor Protection System (with the reactor shutdown), Containment Isolation, and Emergency Diesel Generators. </br>The apparent cause of the actuation was a pressure pulse in the reference leg of a Reactor level instrument that resulted when a CRD (Control Rod Drive) pump was started without the reference leg backfill system isolated from the CRD system. </br>This notification is being made in accordance with 10CFR50.72(b)(3)(iv)(A).</br>Due to the containment isolation, shutdown cooling was lost for approximately 90 minutes. Initial reactor temperature was ~95 degrees when the isolation occurred. When shutdown cooling was restored, reactor temperature had increased to ~120 degrees. The Emergency Diesel Generators started but did not load. The diesels have been restored to normal standby status. </br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
02:35:00, 21 September 2008 +
44,508 +
02:13:00, 21 September 2008 +
02:35:00, 21 September 2008 +
On Saturday, September 20, 2008, Monticell … On Saturday, September 20, 2008, Monticello Nuclear Generating Plant (MNGP) experienced an actuation of the following systems: Reactor Protection System (with the reactor shutdown), Containment Isolation, and Emergency Diesel Generators. </br>The apparent cause of the actuation was a pressure pulse in the reference leg of a Reactor level instrument that resulted when a CRD (Control Rod Drive) pump was started without the reference leg backfill system isolated from the CRD system. </br>This notification is being made in accordance with 10CFR50.72(b)(3)(iv)(A).</br>Due to the containment isolation, shutdown cooling was lost for approximately 90 minutes. Initial reactor temperature was ~95 degrees when the isolation occurred. When shutdown cooling was restored, reactor temperature had increased to ~120 degrees. The Emergency Diesel Generators started but did not load. The diesels have been restored to normal standby status. </br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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