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At 0159 (EDT), with Unit 2 in Mode 1 at 25 … At 0159 (EDT), with Unit 2 in Mode 1 at 25 percent power, the reactor was manually tripped due to degrading condenser vacuum. After the turbine was tripped, the station service electrical buses did not transfer to alternate supply resulting in loss of the condensate feedwater system and level being controlled by the RCIC system. </br>Operators responded and stabilized the plant. Reactor water level is being maintained via the RCIC system. </br>Pressure is being controlled and decay heat is being removed by the HPCI system in pressure control mode. Unit 1 is not affected.</br>Additionally, an actuation of the primary containment isolation system occurred during the reactor scram. The reason for the actuation was a group II isolation signal was received on reactor water level and a group I isolation was received on decreasing vacuum. </br>Due to the Reactor Protection System actuation while critical, this event is being reported as a four-hour, non- emergency notification per 10 CFR 50.72(b)(2)(iv)(B). Additionally, this event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the primary containment isolation system. </br>There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
05:59:00, 24 March 2019 +
05:23:00, 24 March 2019 +
05:59:00, 24 March 2019 +
At 0159 (EDT), with Unit 2 in Mode 1 at 25 … At 0159 (EDT), with Unit 2 in Mode 1 at 25 percent power, the reactor was manually tripped due to degrading condenser vacuum. After the turbine was tripped, the station service electrical buses did not transfer to alternate supply resulting in loss of the condensate feedwater system and level being controlled by the RCIC system. </br>Operators responded and stabilized the plant. Reactor water level is being maintained via the RCIC system. </br>Pressure is being controlled and decay heat is being removed by the HPCI system in pressure control mode. Unit 1 is not affected.</br>Additionally, an actuation of the primary containment isolation system occurred during the reactor scram. The reason for the actuation was a group II isolation signal was received on reactor water level and a group I isolation was received on decreasing vacuum. </br>Due to the Reactor Protection System actuation while critical, this event is being reported as a four-hour, non- emergency notification per 10 CFR 50.72(b)(2)(iv)(B). Additionally, this event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the primary containment isolation system. </br>There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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00:00:00, 24 March 2019 +
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>.
04:53:30, 24 February 2020 +
05:23:00, 24 March 2019 +
true +
true +
-0.025 d (-0.6 hours, -0.00357 weeks, -8.2188e-4 months) +
05:59:00, 24 March 2019 +
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