Browse wiki
Jump to navigation
Jump to search
At 1315 hours on Tuesday, May 10, 2011, wi … At 1315 hours on Tuesday, May 10, 2011, with the Reactor Mode Select Switch in Startup, the Reactor Protection System (RPS) actuated due to a valid Hi-Hi trip signal from the Intermediate Range Monitors (IRMs) of the Neutron Monitoring System. At the time of the RPS actuation, reactor thermal power was four (4)% and control rods were being withdrawn as part of a planned reactor startup from a refueling outage. The RPS actuation signal resulted in a reactor scram. The IRMs were in range 7 when the scram occurred.</br>All control rods automatically inserted in accordance with design. No other ESF actuation signals were generated. The reactor scram was not part of pre-planned test or reactor operation. The cause of the Hi-Hi IRM trip signal is under investigation.</br>This event had no impact on the health and/or safety of the public.</br>The licensee has notified the NRC Senior Resident Inspector.</br>This 4-hour notification is being made in accordance with 10CFR50.72(b)(2)(iv)(B).</br>The unit is in a normal post trip electrical alignment. Decay heat is being removed via the main steam line drains to the main condenser.</br>The licensee will notify the Massachusetts Emergency Management Agency.Massachusetts Emergency Management Agency. +
17:15:00, 10 May 2011 +
16:15:00, 10 May 2011 +
17:15:00, 10 May 2011 +
At 1315 hours on Tuesday, May 10, 2011, wi … At 1315 hours on Tuesday, May 10, 2011, with the Reactor Mode Select Switch in Startup, the Reactor Protection System (RPS) actuated due to a valid Hi-Hi trip signal from the Intermediate Range Monitors (IRMs) of the Neutron Monitoring System. At the time of the RPS actuation, reactor thermal power was four (4)% and control rods were being withdrawn as part of a planned reactor startup from a refueling outage. The RPS actuation signal resulted in a reactor scram. The IRMs were in range 7 when the scram occurred.</br>All control rods automatically inserted in accordance with design. No other ESF actuation signals were generated. The reactor scram was not part of pre-planned test or reactor operation. The cause of the Hi-Hi IRM trip signal is under investigation.</br>This event had no impact on the health and/or safety of the public.</br>The licensee has notified the NRC Senior Resident Inspector.</br>This 4-hour notification is being made in accordance with 10CFR50.72(b)(2)(iv)(B).</br>The unit is in a normal post trip electrical alignment. Decay heat is being removed via the main steam line drains to the main condenser.</br>The licensee will notify the Massachusetts Emergency Management Agency.Massachusetts Emergency Management Agency. +
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, 10 May 2011 +
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>.
22:28:03, 24 September 2017 +
16:15:00, 10 May 2011 +
true +
-0.0417 d (-1 hours, -0.00595 weeks, -0.00137 months) +
17:15:00, 10 May 2011 +
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.