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At 2159 Sequoyah Unit 1 was manually tripp … At 2159 Sequoyah Unit 1 was manually tripped from 18% reactor power. The manual trip was in response to automatic isolation of all intermediate pressure feedwater heater strings resulting in a loss of all condensate flow. The feedwater heater strings isolated following a manual trip of the main turbine. The main turbine was manually tripped in response to a failed open moisture separator reheater relief valve. At the time of the event Sequoyah Unit 1 was raising power following a refueling outage.</br>Following the reactor trip, all safety-related equipment operated as designed. Auxiliary feedwater automatically actuated as expected on loss of the operating main feedwater pump.</br>The plant is currently being maintained in Mode 3 at NOT/NOP, approximately 547 F and 2235 psig, with auxiliary feedwater supplying the steam generators and steam dumps to main condenser removing decay heat.</br>Maintenance activities have been initiated to repair the MSR relief valve.</br>Electrical lineup is normal with all safety related equipment operable. Licensee is investigation the cause for the relief valve failure. </br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
01:59:00, 29 April 2009 +
45,029 +
23:50:00, 28 April 2009 +
01:59:00, 29 April 2009 +
At 2159 Sequoyah Unit 1 was manually tripp … At 2159 Sequoyah Unit 1 was manually tripped from 18% reactor power. The manual trip was in response to automatic isolation of all intermediate pressure feedwater heater strings resulting in a loss of all condensate flow. The feedwater heater strings isolated following a manual trip of the main turbine. The main turbine was manually tripped in response to a failed open moisture separator reheater relief valve. At the time of the event Sequoyah Unit 1 was raising power following a refueling outage.</br>Following the reactor trip, all safety-related equipment operated as designed. Auxiliary feedwater automatically actuated as expected on loss of the operating main feedwater pump.</br>The plant is currently being maintained in Mode 3 at NOT/NOP, approximately 547 F and 2235 psig, with auxiliary feedwater supplying the steam generators and steam dumps to main condenser removing decay heat.</br>Maintenance activities have been initiated to repair the MSR relief valve.</br>Electrical lineup is normal with all safety related equipment operable. Licensee is investigation the cause for the relief valve failure. </br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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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>.
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