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On August 13, 2001, during a transient tha … On August 13, 2001, during a transient that began at 100 percent power, an automatic scram occurred at 49 percent reactor power. T The scram included automatic insertion of the control rods. T About 40 minutes after the scram, safety-related reactor water level instrumentation began to trend anomalously from actual water level and caused level instrumentation to be inoperable for approximately 36 minutes.</br></br>The root cause of the scram was concurrent trip of RPS channels "A" and "B".</br></br>Channel "A" tripped due to a loss of Bus "A" power resulting from a surveillance procedure error. T Channel "B" tripped due to high neutron flux resulting from a trip of both recirculation MG sets/pumps. T The root cause of the anomalous water level indication was unique hydraulic conditions that allowed water to drain from reference legs "A" and "B".</br></br>Corrective action taken included the replacement of a fuse in the recirculation MG set field circuit, and isolating the reference leg backfill system. T Corrective action planned includes revising the surveillance procedure, and evaluating options to preclude reference leg water draining. T The events posed no threat to public health and safety.sed no threat to public health and safety. +
On August 13, 2001, during a transient tha … On August 13, 2001, during a transient that began at 100 percent power, an automatic scram occurred at 49 percent reactor power. T The scram included automatic insertion of the control rods. T About 40 minutes after the scram, safety-related reactor water level instrumentation began to trend anomalously from actual water level and caused level instrumentation to be inoperable for approximately 36 minutes.</br></br>The root cause of the scram was concurrent trip of RPS channels "A" and "B".</br></br>Channel "A" tripped due to a loss of Bus "A" power resulting from a surveillance procedure error. T Channel "B" tripped due to high neutron flux resulting from a trip of both recirculation MG sets/pumps. T The root cause of the anomalous water level indication was unique hydraulic conditions that allowed water to drain from reference legs "A" and "B".</br></br>Corrective action taken included the replacement of a fuse in the recirculation MG set field circuit, and isolating the reference leg backfill system. T Corrective action planned includes revising the surveillance procedure, and evaluating options to preclude reference leg water draining. T The events posed no threat to public health and safety.sed no threat to public health and safety. +
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>.
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6 +
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>.
05:35:55, 1 December 2017 +
Feedwater +, Service water +, High Pressure Coolant Injection +, Reactor Protection System +, Emergency Diesel Generator +, Main Steam Isolation Valve +, Reactor Core Isolation Cooling +, Primary containment +, Main Transformer +, Core Spray +, Reactor Building Ventilation +, Residual Heat Removal +, Standby Gas Treatment System +, Automatic Depressurization System +, Standby Liquid Control +, Core Standby Cooling System +, Control Rod + and Containment Spray +
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.