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10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor +, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat +, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition +, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material + and 10 CFR 50.72#b3vD +
100 +
At 0900 (CDT) on May 8, 2012, it was deter … At 0900 (CDT) on May 8, 2012, it was determined that Monticello Nuclear Generating Plant did not meet Technical Specification Limiting Condition for Operation 3.3.8.1 because the requirement of Table 3.3.8.1-1 for the 4.16 KV Essential Bus Degraded Voltage time delay transfer to the Emergency Diesel Generators (EDGs) of 9.2 seconds could not be met under all postulated conditions. The degraded transfer scheme has the ability to transfer to an intermediate offsite source (1AR) which under a degraded voltage condition, coincident with an accident, would delay the transfer to the EDGs an additional 5 seconds. Both EDGs were subsequently declared inoperable.</br>As an interim action 1AR transformer has been removed from service. This eliminates the unanalyzed condition, restores Technical Specification compliance, and restores both EDGs to an operable condition.</br>Additionally this event is being reported under criteria 10 CFR 50.72(b)(3)(v)(D) - Accident Mitigation.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
14:00:00, 8 May 2012 +
47,909 +
17:06:00, 8 May 2012 +
14:00:00, 8 May 2012 +
At 0900 (CDT) on May 8, 2012, it was deter … At 0900 (CDT) on May 8, 2012, it was determined that Monticello Nuclear Generating Plant did not meet Technical Specification Limiting Condition for Operation 3.3.8.1 because the requirement of Table 3.3.8.1-1 for the 4.16 KV Essential Bus Degraded Voltage time delay transfer to the Emergency Diesel Generators (EDGs) of 9.2 seconds could not be met under all postulated conditions. The degraded transfer scheme has the ability to transfer to an intermediate offsite source (1AR) which under a degraded voltage condition, coincident with an accident, would delay the transfer to the EDGs an additional 5 seconds. Both EDGs were subsequently declared inoperable.</br>As an interim action 1AR transformer has been removed from service. This eliminates the unanalyzed condition, restores Technical Specification compliance, and restores both EDGs to an operable condition.</br>Additionally this event is being reported under criteria 10 CFR 50.72(b)(3)(v)(D) - Accident Mitigation.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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an Unanalyzed Condition Could Delay Transfer to Emergency Diesel Generators Under Certain Postulated Conditions +
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