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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 +
88 +
The licensee also reported an additional 8 … The licensee also reported an additional 8 hour Non-emergency report in accordance with 10CFR50.72(b)(3)(v)(D)</br>On February 10, 2014, (at 1650 CST) Monticello station personnel identified a vulnerability where a single failure could result in the Emergency Diesel Generators (EDGs) picking up load on the essential busses in a time frame longer than what is required by Monticello Technical Specification Surveillance Requirement (TS SR) 3.8.1.12. This surveillance requires that on a simulated or actual loss of off-site power signal in conjunction with an actual or simulated ECCS initiation signal, the Emergency Diesel Generators auto-start from standby condition and energize permanently connected loads in approximately 10 seconds. The single failure vulnerability could result in the EDGs energizing the connected loads in a slightly longer time period based upon actual test data (< 11 seconds). </br>As a result, Technical Specification SR 3.8.1.12 was declared not met and both EDGs were declared inoperable. Monticello has subsequently isolated the single failure vulnerability and declared the EDGs operable. The station remained in a safe condition during the discovery of this vulnerability. Both EDGs remain available and functional (and operable), off-site power remains available, and the plant continues to operate in a normal condition with no initiating events present.</br>The single failure vulnerability was associated with the 1AR 13.8KV transformer logic. The 1AR transformer is one of three off-site power sources. 1R and 2R meet the TS requirements for Off-site power.</br>The licensee notified the NRC Resident Inspector and the State of Minnesota Duty Officer.ctor and the State of Minnesota Duty Officer. +
22:50:00, 10 February 2014 +
49,814 +
20:58:00, 10 February 2014 +
22:50:00, 10 February 2014 +
The licensee also reported an additional 8 … The licensee also reported an additional 8 hour Non-emergency report in accordance with 10CFR50.72(b)(3)(v)(D)</br>On February 10, 2014, (at 1650 CST) Monticello station personnel identified a vulnerability where a single failure could result in the Emergency Diesel Generators (EDGs) picking up load on the essential busses in a time frame longer than what is required by Monticello Technical Specification Surveillance Requirement (TS SR) 3.8.1.12. This surveillance requires that on a simulated or actual loss of off-site power signal in conjunction with an actual or simulated ECCS initiation signal, the Emergency Diesel Generators auto-start from standby condition and energize permanently connected loads in approximately 10 seconds. The single failure vulnerability could result in the EDGs energizing the connected loads in a slightly longer time period based upon actual test data (< 11 seconds). </br>As a result, Technical Specification SR 3.8.1.12 was declared not met and both EDGs were declared inoperable. Monticello has subsequently isolated the single failure vulnerability and declared the EDGs operable. The station remained in a safe condition during the discovery of this vulnerability. Both EDGs remain available and functional (and operable), off-site power remains available, and the plant continues to operate in a normal condition with no initiating events present.</br>The single failure vulnerability was associated with the 1AR 13.8KV transformer logic. The 1AR transformer is one of three off-site power sources. 1R and 2R meet the TS requirements for Off-site power.</br>The licensee notified the NRC Resident Inspector and the State of Minnesota Duty Officer.ctor and the State of Minnesota Duty Officer. +
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