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During pressure drop testing of the backup … During pressure drop testing of the backup nitrogen supply for HCV-345 (Containment Spray Header isolation valve) the accumulator failed its test. This renders HCV-345 inoperable. HCV-344 the opposite header isolation valve also has an air leak that appears to be of similar magnitude to the leak on HCV-345. Fort Calhoun Station is conservatively considering both valves inoperable and has entered technical specification 2.0.1 which requires shutting the plant down to hot standby within 6 hours. The plant shutdown began at 1513 CDT. Repair efforts are underway on HCV-345 and HCV-344.</br>The leakage on both valves was identified by systems engineering during testing.</br>The licensee informed the NRC Resident Inspector.</br>* * * UPDATE AT 1756 EDT ON 10/27/10 FROM AARON CHLADIL TO S. SANDIN * * *</br>At 1647 CDT, the licensee exited technical specification 2.0.1 after declaring HCV-344 operable. The Unit is currently at 74% power. The licensee will stabilize power at 70% and then commence power escalation.</br>The licensee informed the NRC Resident Inspector.</br>Notified R4DO (Proulx).</br>* * * RETRACTION FROM ERICK MATZKE TO HOWIE CROUCH AT 1155 EST ON 12/17/10 * * * </br>Following the original notification, the Fort Calhoun Station reviewed and reanalyzed the acceptance criteria for the subject valve air accumulators. The analysis determined that the valves had been and were operable during the event. Therefore, the report under 10CFR50.72(b)(3)(v)(D) is being retracted.</br>The licensee has notified the NRC Resident Inspector. Notified R4D0 (Howell).sident Inspector. Notified R4D0 (Howell). +
17:22:00, 27 October 2010 +
46,368 +
17:05:00, 27 October 2010 +
17:22:00, 27 October 2010 +
During pressure drop testing of the backup … During pressure drop testing of the backup nitrogen supply for HCV-345 (Containment Spray Header isolation valve) the accumulator failed its test. This renders HCV-345 inoperable. HCV-344 the opposite header isolation valve also has an air leak that appears to be of similar magnitude to the leak on HCV-345. Fort Calhoun Station is conservatively considering both valves inoperable and has entered technical specification 2.0.1 which requires shutting the plant down to hot standby within 6 hours. The plant shutdown began at 1513 CDT. Repair efforts are underway on HCV-345 and HCV-344.</br>The leakage on both valves was identified by systems engineering during testing.</br>The licensee informed the NRC Resident Inspector.</br>* * * UPDATE AT 1756 EDT ON 10/27/10 FROM AARON CHLADIL TO S. SANDIN * * *</br>At 1647 CDT, the licensee exited technical specification 2.0.1 after declaring HCV-344 operable. The Unit is currently at 74% power. The licensee will stabilize power at 70% and then commence power escalation.</br>The licensee informed the NRC Resident Inspector.</br>Notified R4DO (Proulx).</br>* * * RETRACTION FROM ERICK MATZKE TO HOWIE CROUCH AT 1155 EST ON 12/17/10 * * * </br>Following the original notification, the Fort Calhoun Station reviewed and reanalyzed the acceptance criteria for the subject valve air accumulators. The analysis determined that the valves had been and were operable during the event. Therefore, the report under 10CFR50.72(b)(3)(v)(D) is being retracted.</br>The licensee has notified the NRC Resident Inspector. Notified R4D0 (Howell).sident Inspector. Notified R4D0 (Howell). +
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00:00:00, 17 December 2010 +
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17:05:00, 27 October 2010 +
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17:22:00, 27 October 2010 +
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