Browse wiki
Jump to navigation
Jump to search
On June 13, 2011 at 1924 CDT, an automatic … On June 13, 2011 at 1924 CDT, an automatic reactor trip was actuated during Shutdown Bank Insertion for Beginning of Life Physics Testing. Neutron flux lowered from the intermediate range to the point of automatic energization of the Source Range Nuclear Instruments. Energization of the Source Range Nuclear Instruments during this step is anticipated and permissible per the test procedure. When it energized, the N-31 Source Range Nuclear Instrument (Red Channel) failed high which initiated an automatic reactor trip.</br>All plant systems functioned as required, including the Reactor Protection System. All control rods fully inserted into the core. There was no Emergency Core Cooling System or Auxiliary Feedwater System actuation. No Emergency Diesel Generators were started and power continues to be supplied from off site. The reactor coolant system has forced circulation and the atmospheric steam dumps are currently being used for decay heat removal from the steam generators.</br>There was no radiological release and emergency plan implementation was not required.</br>An investigation of the failure of the N-31 Source Range Nuclear Instrument is in progress</br>There is no known primary to secondary leakage. The licensee notified the NRC Resident Inspector.</br>* * * UPDATE FROM RUSS PARKER TO DONALD NORWOOD AT 2155 EDT ON 6/14/11 * * *</br>At the time of the trip, the reactor was subcritical. This notification is updated to reflect reporting in accordance with 10CFR50.72(b)(3)(iv)(A).</br>An investigation of the failure of the N-31 source range nuclear instrument continues.</br>This event was initially reported by the licensee as a four-hour report in accordance with 10CFR50.72(b)(2)(iv)(B). </br>The licensee notified the NRC Resident Inspector.</br>Notified R3DO (Kozak).</br>* * * UPDATE FROM ALEX RIVAS TO HUFFMAN ON 10/12/11 AT 1502 EDT * * * </br>'On June 14, 2011 at 2055 EDT, EN 46957 was amended to state the reactor was subcritical at the time of the trip. Subsequent review of this situation by the licensee resulted in a determination that at the time the test sequence was initiated, the reactor was critical and in MODE 2. Accordingly, this non-emergency report is amended to reflect EN 46957 as originally submitted on 06/13/11 at 2229 CDT. LER 301/2011-004-01 (submitted on July 25, 2011) will be revised accordingly.'</br>The licensee has notified the NRC Resident Inspector. R3DO (Peterson) notified.dent Inspector. R3DO (Peterson) notified.
00:24:00, 14 June 2011 +
46,957 +
23:29:00, 13 June 2011 +
00:24:00, 14 June 2011 +
On June 13, 2011 at 1924 CDT, an automatic … On June 13, 2011 at 1924 CDT, an automatic reactor trip was actuated during Shutdown Bank Insertion for Beginning of Life Physics Testing. Neutron flux lowered from the intermediate range to the point of automatic energization of the Source Range Nuclear Instruments. Energization of the Source Range Nuclear Instruments during this step is anticipated and permissible per the test procedure. When it energized, the N-31 Source Range Nuclear Instrument (Red Channel) failed high which initiated an automatic reactor trip.</br>All plant systems functioned as required, including the Reactor Protection System. All control rods fully inserted into the core. There was no Emergency Core Cooling System or Auxiliary Feedwater System actuation. No Emergency Diesel Generators were started and power continues to be supplied from off site. The reactor coolant system has forced circulation and the atmospheric steam dumps are currently being used for decay heat removal from the steam generators.</br>There was no radiological release and emergency plan implementation was not required.</br>An investigation of the failure of the N-31 Source Range Nuclear Instrument is in progress</br>There is no known primary to secondary leakage. The licensee notified the NRC Resident Inspector.</br>* * * UPDATE FROM RUSS PARKER TO DONALD NORWOOD AT 2155 EDT ON 6/14/11 * * *</br>At the time of the trip, the reactor was subcritical. This notification is updated to reflect reporting in accordance with 10CFR50.72(b)(3)(iv)(A).</br>An investigation of the failure of the N-31 source range nuclear instrument continues.</br>This event was initially reported by the licensee as a four-hour report in accordance with 10CFR50.72(b)(2)(iv)(B). </br>The licensee notified the NRC Resident Inspector.</br>Notified R3DO (Kozak).</br>* * * UPDATE FROM ALEX RIVAS TO HUFFMAN ON 10/12/11 AT 1502 EDT * * * </br>'On June 14, 2011 at 2055 EDT, EN 46957 was amended to state the reactor was subcritical at the time of the trip. Subsequent review of this situation by the licensee resulted in a determination that at the time the test sequence was initiated, the reactor was critical and in MODE 2. Accordingly, this non-emergency report is amended to reflect EN 46957 as originally submitted on 06/13/11 at 2229 CDT. LER 301/2011-004-01 (submitted on July 25, 2011) will be revised accordingly.'</br>The licensee has notified the NRC Resident Inspector. R3DO (Peterson) notified.dent Inspector. R3DO (Peterson) notified.
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, 12 October 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>.
22:26:45, 24 September 2017 +
23:29:00, 13 June 2011 +
true +
-0.0383 d (-0.92 hours, -0.00548 weeks, -0.00126 months) +
00:24:00, 14 June 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.