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On June 19, 2012, Unit 1 was shut down due … On June 19, 2012, Unit 1 was shut down due to increasing drywell unidentified leakage. At 1720 EDT on June 19, 2012, the leakage location was discovered to be a welded joint on the 'A' reactor recirculation piping where a 4 inch blank-flanged pipe for chemical decontamination connects to the 28 inch pipe. This constitutes pressure boundary leakage. The location is within the recirculation loop isolation valves on the suction side of the recirculation pump, therefore isolable from the reactor vessel. The reactor was in mode 3 at the time of discovery and LCO 3.4.4 requires entry into mode 4 within 36 hours.</br>As such, the change in modes is required by Technical Specifications, therefore reportable within 4 hours under 10CFR50.72(b)(2)(i). In addition, the pressure boundary leakage at a welded joint is being reported as a degraded condition pursuant to 10CFR50.72(b)(3)(ii)A) and is therefore 8 hour reportable as well.</br>The licensee notified the NRC Resident Inspector. A press release is planned by the licensee. press release is planned by the licensee. +
21:20:00, 19 June 2012 +
48,036 +
19:48:00, 19 June 2012 +
21:20:00, 19 June 2012 +
On June 19, 2012, Unit 1 was shut down due … On June 19, 2012, Unit 1 was shut down due to increasing drywell unidentified leakage. At 1720 EDT on June 19, 2012, the leakage location was discovered to be a welded joint on the 'A' reactor recirculation piping where a 4 inch blank-flanged pipe for chemical decontamination connects to the 28 inch pipe. This constitutes pressure boundary leakage. The location is within the recirculation loop isolation valves on the suction side of the recirculation pump, therefore isolable from the reactor vessel. The reactor was in mode 3 at the time of discovery and LCO 3.4.4 requires entry into mode 4 within 36 hours.</br>As such, the change in modes is required by Technical Specifications, therefore reportable within 4 hours under 10CFR50.72(b)(2)(i). In addition, the pressure boundary leakage at a welded joint is being reported as a degraded condition pursuant to 10CFR50.72(b)(3)(ii)A) and is therefore 8 hour reportable as well.</br>The licensee notified the NRC Resident Inspector. A press release is planned by the licensee. press release is planned by the licensee. +
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00:00:00, 19 June 2012 +
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