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On December 31, 2014, while performing a wOn December 31, 2014, while performing a walkdown as part of a surveillance test procedure, plant personnel identified through-wall seepage in a Diablo Canyon Power Plant Unit 1 socket weld inside residual heat removal system. Subsequent cleanup of the boric acid accumulation revealed active seepage of 30 drops per minute. A visual inspection identified that the source of the seepage was a circumferential crack on the socket weld.</br></br>This is the initial Licensee Event Report (LER) for this event. Pacific Gas & Electric will submit a supplemental LER describing event cause and corrective actions no later than May 8, 2015.</br></br>This condition did not have an adverse effect on the health and safety of the public.effect on the health and safety of the public.  +
March 2, 2015  +
December 31, 2014  +
On December 31, 2014, while performing a wOn December 31, 2014, while performing a walkdown as part of a surveillance test procedure, plant personnel identified through-wall seepage in a Diablo Canyon Power Plant Unit 1 socket weld inside residual heat removal system. Subsequent cleanup of the boric acid accumulation revealed active seepage of 30 drops per minute. A visual inspection identified that the source of the seepage was a circumferential crack on the socket weld.</br></br>This is the initial Licensee Event Report (LER) for this event. Pacific Gas & Electric will submit a supplemental LER describing event cause and corrective actions no later than May 8, 2015.</br></br>This condition did not have an adverse effect on the health and safety of the public.effect on the health and safety of the public.  +
2,015  +
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16:50:20, 19 March 2017  +
March 2, 2015  +
December 31, 2014  +
Both Trains of Residual Heat Removal Inoperable Due to Circumferential Crack on a Socket Weld  +
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