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At 1615 CDT time on April 15th, 2006 with … At 1615 CDT time on April 15th, 2006 with the Reactor at 100% power, River Bend Station experienced a reactor scram resulting from a RPS actuation. All plant systems performed as designed. The reactor is stable with pressure and temperature being controlled by feed water system and main steam bypass valves, respectively. The cause of the scram is not known at this time. The plant is conducting causal investigations to fully understand the cause of the plant scram.</br>All control rods fully inserted, no safety valves lifted, and no Emergency Safety Feature actuations occurred on the scram. The electrical grid is stable. </br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE AT 1033 EDT ON 4/16/06 FROM KENNETH HIGGINBOTHAM TO S. SANDIN * * * </br>River Bend Station status on 04/16/2006: The unit is in Mode 3, Hot Shutdown, and stable. Investigation of the plant trip found an optical isolator in the control circuit for the end-of-cycle recirculation pump trip failed causing both recirculation pumps to shift to slow speed. The pump downshift placed reactor power and flow into the exclusion region of the power to flow map. The reactor received trip signals from APRM E & H heat flux exceeding their corresponding trip set points. The optical isolator is being replaced. Plant restart will commence pending successful replacement of the optical isolator.</br>The licensee informed the NRC Resident Inspector. Notified R4DO (Pruett).C Resident Inspector. Notified R4DO (Pruett). +
21:15:00, 15 April 2006 +
42,505 +
20:52:00, 15 April 2006 +
21:15:00, 15 April 2006 +
At 1615 CDT time on April 15th, 2006 with … At 1615 CDT time on April 15th, 2006 with the Reactor at 100% power, River Bend Station experienced a reactor scram resulting from a RPS actuation. All plant systems performed as designed. The reactor is stable with pressure and temperature being controlled by feed water system and main steam bypass valves, respectively. The cause of the scram is not known at this time. The plant is conducting causal investigations to fully understand the cause of the plant scram.</br>All control rods fully inserted, no safety valves lifted, and no Emergency Safety Feature actuations occurred on the scram. The electrical grid is stable. </br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE AT 1033 EDT ON 4/16/06 FROM KENNETH HIGGINBOTHAM TO S. SANDIN * * * </br>River Bend Station status on 04/16/2006: The unit is in Mode 3, Hot Shutdown, and stable. Investigation of the plant trip found an optical isolator in the control circuit for the end-of-cycle recirculation pump trip failed causing both recirculation pumps to shift to slow speed. The pump downshift placed reactor power and flow into the exclusion region of the power to flow map. The reactor received trip signals from APRM E & H heat flux exceeding their corresponding trip set points. The optical isolator is being replaced. Plant restart will commence pending successful replacement of the optical isolator.</br>The licensee informed the NRC Resident Inspector. Notified R4DO (Pruett).C Resident Inspector. Notified R4DO (Pruett). +
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00:00:00, 16 April 2006 +
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>.
02:18:57, 2 March 2018 +
20:52:00, 15 April 2006 +
true +
-0.0158 d (-0.38 hours, -0.00226 weeks, -5.20524e-4 months) +
21:15:00, 15 April 2006 +
Control Rod + and Main Steam +
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