Browse wiki
Jump to navigation
Jump to search
A Turbine trip and Feedwater Isolation Sig … A Turbine trip and Feedwater Isolation Signal was generated as a result of high level in 'A' Steam Generator. At approximately 0007 CST, a turbine trip and Feedwater Isolation Signal was generated when the level in the 'A' Steam Generator exceeded the initiation set point of 78%. Steam Generator level returned below the initiation setpoint at approximately 0008 CST. Steam Generator 'A' high level resulted from swell of the Steam Generator after opening the 'A' Main Steam Isolation Valve. Level was approximately 50% prior to the event and returned to approximately 50% within one minute.</br>The turbine was already in the tripped condition due to the plant trip that occurred at 1458 CST on 03/02/2010 (Reference EN# 45739). </br>Steam Generators are being fed with the motor driven startup Feedwater pump. Decay heat removal is via the Steam Generator Atmospheric Relief Valves and steam dumps. The plant is in Mode 4 with Reactor Coolant System pressure at approximately 500 psig and temperature at approximately 332 degrees F.</br>Two Main Feedwater isolation valves did not fully close but the actuators were being supplied with auxiliary medium (air) at the time of the actuation. Feedwater isolation valves are not required to be operable in Mode 4.</br>The licensee will notify the NRC Resident Inspector.</br> * * * RETRACTION FROM RICK HUBBARD TO PETE SNYDER AT 1456 ON 4/29/2010 * * * </br>This event (Event Number 45745) is being retracted. A valid actuation of any systems listed in paragraph 50.72 (b)(3)(iv)(B) did not occur. The plant was in Mode 4 and neither a reactor trip nor an auxiliary feedwater system actuation signal occurred. Additional evaluation determined that the turbine trip and feedwater isolation signal are a function of the ESFAS (Engineered Safety Features Actuation System) instrumentation and does not result in an actuation of the RPS (Reactor Protection System) or other systems listed in paragraph 50.72 (b)(3)(iv)(B).</br>The licensee notified the NRC Resident Inspector.</br>Notified R4DO(Clark). Resident Inspector.
Notified R4DO(Clark).
06:07:00, 5 March 2010 +
45,745 +
03:25:00, 5 March 2010 +
06:07:00, 5 March 2010 +
A Turbine trip and Feedwater Isolation Sig … A Turbine trip and Feedwater Isolation Signal was generated as a result of high level in 'A' Steam Generator. At approximately 0007 CST, a turbine trip and Feedwater Isolation Signal was generated when the level in the 'A' Steam Generator exceeded the initiation set point of 78%. Steam Generator level returned below the initiation setpoint at approximately 0008 CST. Steam Generator 'A' high level resulted from swell of the Steam Generator after opening the 'A' Main Steam Isolation Valve. Level was approximately 50% prior to the event and returned to approximately 50% within one minute.</br>The turbine was already in the tripped condition due to the plant trip that occurred at 1458 CST on 03/02/2010 (Reference EN# 45739). </br>Steam Generators are being fed with the motor driven startup Feedwater pump. Decay heat removal is via the Steam Generator Atmospheric Relief Valves and steam dumps. The plant is in Mode 4 with Reactor Coolant System pressure at approximately 500 psig and temperature at approximately 332 degrees F.</br>Two Main Feedwater isolation valves did not fully close but the actuators were being supplied with auxiliary medium (air) at the time of the actuation. Feedwater isolation valves are not required to be operable in Mode 4.</br>The licensee will notify the NRC Resident Inspector.</br> * * * RETRACTION FROM RICK HUBBARD TO PETE SNYDER AT 1456 ON 4/29/2010 * * * </br>This event (Event Number 45745) is being retracted. A valid actuation of any systems listed in paragraph 50.72 (b)(3)(iv)(B) did not occur. The plant was in Mode 4 and neither a reactor trip nor an auxiliary feedwater system actuation signal occurred. Additional evaluation determined that the turbine trip and feedwater isolation signal are a function of the ESFAS (Engineered Safety Features Actuation System) instrumentation and does not result in an actuation of the RPS (Reactor Protection System) or other systems listed in paragraph 50.72 (b)(3)(iv)(B).</br>The licensee notified the NRC Resident Inspector.</br>Notified R4DO(Clark). Resident Inspector.
Notified R4DO(Clark).
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>.
00:00:00, 29 April 2010 +
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>.
02:09:47, 2 March 2018 +
03:25:00, 5 March 2010 +
false +
false +
-0.113 d (-2.7 hours, -0.0161 weeks, -0.0037 months) +
06:07:00, 5 March 2010 +
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.