Browse wiki
Jump to navigation
Jump to search
A reverse feed was initiated through new M … A reverse feed was initiated through new Main Power Transformers t (MPTs) t to support removing the Reserve Auxiliary Transformer (RAT) power source for maintenance. A few seconds after closing the switchyard breaker, protective relaying for the Static VAR Compensators t (SVC) actuated due to inrush harmonic currents that originated from the MPTs as a result of MPT energization. This tripped the RAT and Emergency Reserve Auxiliary Transformer t (ERAT) t SVCs to off. Without the SVC support, t the ERAT output voltage dropped below the second level undervoltage setpoint, t causing the Division 3 bus to transfer to the on-site source, t resulting in an auto-start of the Division 3 Emergency Diesel Generator t (DG). After the Division 3 DG re-energized the bus, t the Div 3 essential Shutdown Service Water pump auto-started in response to a low system pressure signal. Operators entered the Off-Normal Procedure for Loss of AC Power, and suspended core alterations and movement of irradiated fuel assemblies. The causes of this event were the absence of barriers to limit the impact of the grid disturbance and the design review for the new MPTs did not identify the potential for grid disturbance impacts. The procedures for the reverse feed activity and the electrical review standard will be revised to prevent recurrence.ard will be revised to prevent recurrence. +
A reverse feed was initiated through new M … A reverse feed was initiated through new Main Power Transformers t (MPTs) t to support removing the Reserve Auxiliary Transformer (RAT) power source for maintenance. A few seconds after closing the switchyard breaker, protective relaying for the Static VAR Compensators t (SVC) actuated due to inrush harmonic currents that originated from the MPTs as a result of MPT energization. This tripped the RAT and Emergency Reserve Auxiliary Transformer t (ERAT) t SVCs to off. Without the SVC support, t the ERAT output voltage dropped below the second level undervoltage setpoint, t causing the Division 3 bus to transfer to the on-site source, t resulting in an auto-start of the Division 3 Emergency Diesel Generator t (DG). After the Division 3 DG re-energized the bus, t the Div 3 essential Shutdown Service Water pump auto-started in response to a low system pressure signal. Operators entered the Off-Normal Procedure for Loss of AC Power, and suspended core alterations and movement of irradiated fuel assemblies. The causes of this event were the absence of barriers to limit the impact of the grid disturbance and the design review for the new MPTs did not identify the potential for grid disturbance impacts. The procedures for the reverse feed activity and the electrical review standard will be revised to prevent recurrence.ard will be revised to prevent recurrence. +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
0.00594 d (0.143 hours, 8.482143e-4 weeks, 1.951965e-4 months) +, 0.0061 d (0.146 hours, 8.713624e-4 weeks, 2.005235e-4 months) +, 0.00637 d (0.153 hours, 9.093915e-4 weeks, 2.09275e-4 months) +, 0.00947 d (0.227 hours, 0.00135 weeks, 3.11249e-4 months) +, 0.00965 d (0.232 hours, 0.00138 weeks, 3.17337e-4 months) +, 0.0122 d (0.293 hours, 0.00174 weeks, 4.006665e-4 months) + and 0.0139 d (0.334 hours, 0.00199 weeks, 4.58122e-4 months) +
1 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
04:32:58, 1 December 2017 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.