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At 1400 on Saturday, January 8, 2011, Ocon … At 1400 on Saturday, January 8, 2011, Oconee Unit 1 initiated a shutdown required by Technical Specification (TS) 3.6.3, 'Containment Isolation Valves.' Unit 1 experienced an unexpected partial closure of letdown line containment isolation valve 1HP-5 during Engineered Safeguards (ES) Channel 2 on-line testing. 1HP-5 reopened when power was restored. Unit 1 entered TS 3.6.3, CONDITION A at 0148 on 1/8/11. Unit 1 entered TS 3.6.3, CONDITION D at 0548 on 1/8/11. TS 3.6.3, CONDITION D requires Unit 1 to be in mode 3 by 1748 on 1/8/11, and in mode 5 by 1748 on 1/9/11. An updated notification will be provided if the TS CONDITION is exited prior to Unit 1 reaching mode 5. An investigation is in progress to determine the cause of the unexpected partial closure of 1HP-5.</br>All safety systems required for safe shutdown are operable and the electrical lineup is normal. The licensee is evaluating any potential impact of this event on Unit 2 and Unit 3. There is no estimate for the completion of the investigation at this time.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
19:00:00, 8 January 2011 +
46,526 +
17:06:00, 8 January 2011 +
19:00:00, 8 January 2011 +
At 1400 on Saturday, January 8, 2011, Ocon … At 1400 on Saturday, January 8, 2011, Oconee Unit 1 initiated a shutdown required by Technical Specification (TS) 3.6.3, 'Containment Isolation Valves.' Unit 1 experienced an unexpected partial closure of letdown line containment isolation valve 1HP-5 during Engineered Safeguards (ES) Channel 2 on-line testing. 1HP-5 reopened when power was restored. Unit 1 entered TS 3.6.3, CONDITION A at 0148 on 1/8/11. Unit 1 entered TS 3.6.3, CONDITION D at 0548 on 1/8/11. TS 3.6.3, CONDITION D requires Unit 1 to be in mode 3 by 1748 on 1/8/11, and in mode 5 by 1748 on 1/9/11. An updated notification will be provided if the TS CONDITION is exited prior to Unit 1 reaching mode 5. An investigation is in progress to determine the cause of the unexpected partial closure of 1HP-5.</br>All safety systems required for safe shutdown are operable and the electrical lineup is normal. The licensee is evaluating any potential impact of this event on Unit 2 and Unit 3. There is no estimate for the completion of the investigation at this time.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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05000269/LER-2011-002, For Oconee Nuclear Station, Regarding Completion of a Shutdown Required by Technical Specifications for an Inoperable Containment Isolation Valve +, For Oconee Nuclear Station + and Regarding Completion of a Shutdown Required by Technical Specifications for an Inoperable Containment Isolation Valve +
00:00:00, 8 January 2011 +
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Technical Specification Required Shutdown Due to Partial Closure of Letdown Line Isolation Valve 1Hp-5 +
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