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On April 9, 2012, at 0529 hours, electrica … On April 9, 2012, at 0529 hours, electrical power was lost to the 4160v emergency bus E1. Activities to support testing of emergency bus E1 were in progress when technicians connected a recorder across the terminals of an under-voltage relay on emergency bus E1 and caused the normal supply breakers for emergency bus E1 to open. </br>The power loss to emergency bus E1 affected both Unit 1 and Unit 2. Emergency diesel generator #1 automatically started and re-energized the E1 emergency bus.</br>Unit 1 was in Mode 5 and electrical systems were aligned to support testing of emergency bus E1. As a result, no other safety system isolations or actuations occurred. Per design, no Unit 2 safety system isolations or actuations occurred.</br>The safety significance of this event is minimal. Safety systems functioned as designed when emergency bus E1 de-energized. There was no interruption of Unit 1 shutdown cooling as a result of this event. Normal power supply was restored to emergency bus E1 and emergency diesel generator #1 was shutdown at 0701 hours.</br>Reporting requirements met by this notification: 10CFR50.72(b)(3)(iv)(A) with specified system in 10CFR50.72(b)(3) (iv)(B)(8). The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
09:29:00, 9 April 2012 +
47,817 +
09:15:00, 9 April 2012 +
09:29:00, 9 April 2012 +
On April 9, 2012, at 0529 hours, electrica … On April 9, 2012, at 0529 hours, electrical power was lost to the 4160v emergency bus E1. Activities to support testing of emergency bus E1 were in progress when technicians connected a recorder across the terminals of an under-voltage relay on emergency bus E1 and caused the normal supply breakers for emergency bus E1 to open. </br>The power loss to emergency bus E1 affected both Unit 1 and Unit 2. Emergency diesel generator #1 automatically started and re-energized the E1 emergency bus.</br>Unit 1 was in Mode 5 and electrical systems were aligned to support testing of emergency bus E1. As a result, no other safety system isolations or actuations occurred. Per design, no Unit 2 safety system isolations or actuations occurred.</br>The safety significance of this event is minimal. Safety systems functioned as designed when emergency bus E1 de-energized. There was no interruption of Unit 1 shutdown cooling as a result of this event. Normal power supply was restored to emergency bus E1 and emergency diesel generator #1 was shutdown at 0701 hours.</br>Reporting requirements met by this notification: 10CFR50.72(b)(3)(iv)(A) with specified system in 10CFR50.72(b)(3) (iv)(B)(8). The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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