Browse wiki
Jump to navigation
Jump to search
On 1/20/2006 at 0730 hrs, a Unit 2 control … On 1/20/2006 at 0730 hrs, a Unit 2 control room annunciator was received indicating high conductivity/sodium in the main condenser. The Chemistry Dept. confirmed the sodium level was high indicating saltwater intrusion from a tube leak in the 2B2 Condenser Waterbox. Per the Secondary Chemistry Off-Normal Procedure, a rapid downpower to less than 5% power was initiated to remove the affected waterbox from service. It was decided to go ahead and remove Unit 2 from service rather than remain critical at a low power level. The downpower was planned to decrease power to approximately 25%, perform a manual transfer of plant electrics to the auxiliary transformers, and then manually trip the reactor in accordance with plant procedures. All systems worked as planned during the downpower and the reactor was manually tripped at approximately 25% power at 08:56 hrs. Standard Post Trip Actions and the Reactor Trip Recovery Procedure were carried out without incident.</br>All control rods fully inserted and no Steam Generator (S/G) Safety Valves lifted. Feedwater to the S/G was supplied by the Main Feedwater pumps during the shutdown and later transferred to the Auxiliary Feedwater pumps. All safe shutdown equipment operated as expected. The plant is stable in Mode 3, Hot Standby conditions, with decay heat removal being accomplished by steaming through the Atmospheric Dump Valves. The Main Feedwater pumps remain available if needed.</br>Unit 1 was not affected by this event.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
13:56:00, 20 January 2006 +
42,277 +
12:49:00, 20 January 2006 +
13:56:00, 20 January 2006 +
On 1/20/2006 at 0730 hrs, a Unit 2 control … On 1/20/2006 at 0730 hrs, a Unit 2 control room annunciator was received indicating high conductivity/sodium in the main condenser. The Chemistry Dept. confirmed the sodium level was high indicating saltwater intrusion from a tube leak in the 2B2 Condenser Waterbox. Per the Secondary Chemistry Off-Normal Procedure, a rapid downpower to less than 5% power was initiated to remove the affected waterbox from service. It was decided to go ahead and remove Unit 2 from service rather than remain critical at a low power level. The downpower was planned to decrease power to approximately 25%, perform a manual transfer of plant electrics to the auxiliary transformers, and then manually trip the reactor in accordance with plant procedures. All systems worked as planned during the downpower and the reactor was manually tripped at approximately 25% power at 08:56 hrs. Standard Post Trip Actions and the Reactor Trip Recovery Procedure were carried out without incident.</br>All control rods fully inserted and no Steam Generator (S/G) Safety Valves lifted. Feedwater to the S/G was supplied by the Main Feedwater pumps during the shutdown and later transferred to the Auxiliary Feedwater pumps. All safe shutdown equipment operated as expected. The plant is stable in Mode 3, Hot Standby conditions, with decay heat removal being accomplished by steaming through the Atmospheric Dump Valves. The Main Feedwater pumps remain available if needed.</br>Unit 1 was not affected by this event.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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, 20 January 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>.
22:39:32, 24 September 2017 +
12:49:00, 20 January 2006 +
true +
true +
-0.0467 d (-1.12 hours, -0.00667 weeks, -0.00153 months) +
13:56:00, 20 January 2006 +
Safe Shutdown + and Power change +
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.