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(The licensee manually inserted a reactor … (The licensee manually inserted a reactor scram) due to imminent loss of heat sink (condenser). Circulating water to the condenser suffered an unisolable break resulting in loss of suction source to pumps with cavitation. (The) plant was stabilized per emergency operating procedures. Containment isolations signals operated per design with Groups 2, 3, and 4 received.</br>Plant response (was) complicated with (an) unexpected loss of one 161 KV bus in the switchyard. This was caused by a breaker failure lockout of the bus caused by signal from the output breaker. This output breaker did open. Cause of the breaker failure being investigated.</br>(The) power loss (of the 161 KV bus) had minor plant effect. One power supply to essential service offsite transformer 1X3 (was) lost due to the bus lockout. (The) transformer and offsite circuit remained available. (The) plant did sustain a temporary loss of spent fuel pool cooling system. Cooling has been restored with no level or temperature complications.</br>Essential power (remained) available with both onsite SBDG's (Standby Diesel Generators) and offsite circuits (current source). All ECCS available. All safety related equipment operat(ed) as designed, except Reactor Core Isolation Cooling (RCIC) turbine which had difficulty in automatic control. Manual control (of RCIC) was effective. This is not unexpected during the conditions it was operating (low flow).</br>The licensee was shutting down to enter a refueling outage as the time of the event. Circulating water to one cooling tower had been isolated when a riser on the second cooling tower ruptured and resulted in loss of supply to the circwater pumps. All systems functioned as required except for the lockout of the 161KV bus and RCIC automatic control. Rods fully inserted. The plant is in a normal electrical configuration except for the loss of the 161 KV bus which does not supply any safety related busses. No safety relief valves lifted during the transient. Cooling is currently via HPCI and RCIC to the torus with torus cooling via essential service water.</br>The plant is currently stable at 600 psi and being cooled-down to cold shutdown. The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified.
00:00:00, 2 February 2009 +
21:28:00, 1 February 2009 +
00:00:00, 2 February 2009 +
(The licensee manually inserted a reactor … (The licensee manually inserted a reactor scram) due to imminent loss of heat sink (condenser). Circulating water to the condenser suffered an unisolable break resulting in loss of suction source to pumps with cavitation. (The) plant was stabilized per emergency operating procedures. Containment isolations signals operated per design with Groups 2, 3, and 4 received.</br>Plant response (was) complicated with (an) unexpected loss of one 161 KV bus in the switchyard. This was caused by a breaker failure lockout of the bus caused by signal from the output breaker. This output breaker did open. Cause of the breaker failure being investigated.</br>(The) power loss (of the 161 KV bus) had minor plant effect. One power supply to essential service offsite transformer 1X3 (was) lost due to the bus lockout. (The) transformer and offsite circuit remained available. (The) plant did sustain a temporary loss of spent fuel pool cooling system. Cooling has been restored with no level or temperature complications.</br>Essential power (remained) available with both onsite SBDG's (Standby Diesel Generators) and offsite circuits (current source). All ECCS available. All safety related equipment operat(ed) as designed, except Reactor Core Isolation Cooling (RCIC) turbine which had difficulty in automatic control. Manual control (of RCIC) was effective. This is not unexpected during the conditions it was operating (low flow).</br>The licensee was shutting down to enter a refueling outage as the time of the event. Circulating water to one cooling tower had been isolated when a riser on the second cooling tower ruptured and resulted in loss of supply to the circwater pumps. All systems functioned as required except for the lockout of the 161KV bus and RCIC automatic control. Rods fully inserted. The plant is in a normal electrical configuration except for the loss of the 161 KV bus which does not supply any safety related busses. No safety relief valves lifted during the transient. Cooling is currently via HPCI and RCIC to the torus with torus cooling via essential service water.</br>The plant is currently stable at 600 psi and being cooled-down to cold shutdown. 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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