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At 1554 CDT on 08/18/2003 all four Steam G … At 1554 CDT on 08/18/2003 all four Steam Generators alarmed with Steam Flow/Feed Flow Mismatch followed by indication that there was no feedwater flow to the "B" Steam Generator. The reactor tripped approximately 20 seconds later on Steam Generator Low-Low Level, 23.5% Narrow Range, as required. A review of the plant computer information shows that event-initiating cause may be the unexplained closure of the "B" Feedwater Isolation Valve.</br>All plant safety related systems operated as required. The Steam Dumps, which function to remove excess heat as the secondary systems shutdown, exhibited control problems when they were shifted from temperature control mode to steam pressure mode, as required by the emergency operating procedures. The Steam Dumps are currently operating and controlling in manual mode. When the reactor tripped all four Steam Generator Atmospheric Relief Valves opened, a normal response for a trip from full power. The "A" Steam Generator Atmospheric Relief Valve was slow to close in automatic. The valve was closed in manual and returned to automatic and is controlling properly.</br>The plant is currently stable in Mode 3 at NOP and NOT while plant personnel investigate the causes of the trip and formulate the repair/restart plan.</br>All Emergency Core Cooling Systems and the Emergency Diesel Generators are fully operable if needed. The electrical grid is stable.</br>The NRC Resident Inspector is in the Control Room.Resident Inspector is in the Control Room. +
20:54:00, 18 August 2003 +
23:36:00, 18 August 2003 +
20:54:00, 18 August 2003 +
At 1554 CDT on 08/18/2003 all four Steam G … At 1554 CDT on 08/18/2003 all four Steam Generators alarmed with Steam Flow/Feed Flow Mismatch followed by indication that there was no feedwater flow to the "B" Steam Generator. The reactor tripped approximately 20 seconds later on Steam Generator Low-Low Level, 23.5% Narrow Range, as required. A review of the plant computer information shows that event-initiating cause may be the unexplained closure of the "B" Feedwater Isolation Valve.</br>All plant safety related systems operated as required. The Steam Dumps, which function to remove excess heat as the secondary systems shutdown, exhibited control problems when they were shifted from temperature control mode to steam pressure mode, as required by the emergency operating procedures. The Steam Dumps are currently operating and controlling in manual mode. When the reactor tripped all four Steam Generator Atmospheric Relief Valves opened, a normal response for a trip from full power. The "A" Steam Generator Atmospheric Relief Valve was slow to close in automatic. The valve was closed in manual and returned to automatic and is controlling properly.</br>The plant is currently stable in Mode 3 at NOP and NOT while plant personnel investigate the causes of the trip and formulate the repair/restart plan.</br>All Emergency Core Cooling Systems and the Emergency Diesel Generators are fully operable if needed. The electrical grid is stable.</br>The NRC Resident Inspector is in the Control Room.Resident Inspector is in the Control Room. +
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>.
100 +
00:00:00, 18 August 2003 +
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>.
22:44:57, 24 September 2017 +
23:36:00, 18 August 2003 +
Processing error"Processing error" is a predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> and represents errors that appeared in connection with improper value annotations or input processing.
true +
0.113 d (2.7 hours, 0.0161 weeks, 0.0037 months) +
20:54:00, 18 August 2003 +
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.