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On October 8, 2016, it was initially disco … On October 8, 2016, it was initially discovered that the voltage tap changer settings for the 480V Shutdown Board Transformers 1-XFA-231-TS1A (TS1A) and 1-XFA-231-TS1B (TS1B) were incorrect (4160/480V instead of 3952/480V). This could potentially result in lower than minimum required voltages at the electrically downstream buses and equipment during a postulated loss of coolant accident coincident with design minimum voltage conditions. An initial Licensee Event Report (LER 50-259/2016-004-00) was submitted on December 7, 2016 following the initial review. This LER identified that a supplement would be required pending additional technical evaluation. While comprehensive analysis is not complete, the initial aggregate dynamic loading evaluation does not provide assurance that sufficient voltage would be available for various loading scenarios during postulated accident conditions. This condition was determined to have existed since a Unit 1 Design Change was implemented in 2004.</br>This notification is being made pursuant to 10 CFR 50.72(b)(3)(ii), as any event or condition that resulted in the nuclear plant being in an unanalyzed condition that significantly degrades plant safety.</br>On October 9, 2016, and October 12, 2016. the transformer taps for TS1B and TS1A, respectively, were set in accordance with the applicable drawing, which specify the correct tap settings.</br>The NRC Resident Inspector has been notified.</br>In October 2016, the licensee validated that this problem did not exist on units two and three.blem did not exist on units two and three. +
17:20:00, 21 December 2016 +
52,452 +
16:55:00, 21 December 2016 +
17:20:00, 21 December 2016 +
On October 8, 2016, it was initially disco … On October 8, 2016, it was initially discovered that the voltage tap changer settings for the 480V Shutdown Board Transformers 1-XFA-231-TS1A (TS1A) and 1-XFA-231-TS1B (TS1B) were incorrect (4160/480V instead of 3952/480V). This could potentially result in lower than minimum required voltages at the electrically downstream buses and equipment during a postulated loss of coolant accident coincident with design minimum voltage conditions. An initial Licensee Event Report (LER 50-259/2016-004-00) was submitted on December 7, 2016 following the initial review. This LER identified that a supplement would be required pending additional technical evaluation. While comprehensive analysis is not complete, the initial aggregate dynamic loading evaluation does not provide assurance that sufficient voltage would be available for various loading scenarios during postulated accident conditions. This condition was determined to have existed since a Unit 1 Design Change was implemented in 2004.</br>This notification is being made pursuant to 10 CFR 50.72(b)(3)(ii), as any event or condition that resulted in the nuclear plant being in an unanalyzed condition that significantly degrades plant safety.</br>On October 9, 2016, and October 12, 2016. the transformer taps for TS1B and TS1A, respectively, were set in accordance with the applicable drawing, which specify the correct tap settings.</br>The NRC Resident Inspector has been notified.</br>In October 2016, the licensee validated that this problem did not exist on units two and three.blem did not exist on units two and three. +
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00:00:00, 21 December 2016 +
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16:55:00, 21 December 2016 +
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