Browse wiki
Jump to navigation
Jump to search
Invalid Primary Containment And Vessel Iso … Invalid Primary Containment And Vessel Isolation Control System (PCIS) signal results in partial actuation of Emergency Core Cooling System (ECCS) components:</br>The following information is provided as a sixty (60) day telephone notification to the NRC in accordance with 50.73(a)(1) in lieu of the submittal of a written LER to report a condition that resulted in an invalid actuation of the high pressure coolant injection (HPCI) and reactor core isolation coolant (RCIC) systems. NUREG-1022, Revision 2, identifies the information that needs to be reported as discussed below.</br>On May 17, 2010, during the Refueling Outage 28 ECCS test control room personnel identified the reactor vessel level was lowering. Valves HPCI-15 and 16 automatically isolated due to an invalid high steam flow isolation signal. The control room personnel immediately started both control rod drive (CRD) pumps as required by procedure. It was determined that the lowering of reactor vessel level was due to water flowing down the HPCI system and RCIC system turbine steam supply lines. The RCIC-15 valve was manually isolated terminating the event. At this time one CRD pump was secured. Acceptable water level in the reactor vessel was maintained throughout the event. The condition has been entered into the Vermont Yankee Nuclear Power Station Corrective Action Program for evaluation and implementation of corrective actions to preclude recurrence.</br>The high steam flow isolation signal is considered invalid because: 1) At the time of the event, the unit mode switch was in a mode where PCIS was not required; 2) No steam was being generated; and 3) The water flow past differential pressure instrument generated a false high steam flow signal.</br>The event is being reported in accordance with 50.73(a)(1) and 50.73(a)(2)(iv)(A) as an event or condition that as a result of an invalid initiation signal resulted in the actuation of one or more of the systems listed in paragraph 50.73 (a)(2)(iv)(B).</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector.
04:00:00, 17 May 2010 +
46,070 +
11:38:00, 6 July 2010 +
04:00:00, 17 May 2010 +
Invalid Primary Containment And Vessel Iso … Invalid Primary Containment And Vessel Isolation Control System (PCIS) signal results in partial actuation of Emergency Core Cooling System (ECCS) components:</br>The following information is provided as a sixty (60) day telephone notification to the NRC in accordance with 50.73(a)(1) in lieu of the submittal of a written LER to report a condition that resulted in an invalid actuation of the high pressure coolant injection (HPCI) and reactor core isolation coolant (RCIC) systems. NUREG-1022, Revision 2, identifies the information that needs to be reported as discussed below.</br>On May 17, 2010, during the Refueling Outage 28 ECCS test control room personnel identified the reactor vessel level was lowering. Valves HPCI-15 and 16 automatically isolated due to an invalid high steam flow isolation signal. The control room personnel immediately started both control rod drive (CRD) pumps as required by procedure. It was determined that the lowering of reactor vessel level was due to water flowing down the HPCI system and RCIC system turbine steam supply lines. The RCIC-15 valve was manually isolated terminating the event. At this time one CRD pump was secured. Acceptable water level in the reactor vessel was maintained throughout the event. The condition has been entered into the Vermont Yankee Nuclear Power Station Corrective Action Program for evaluation and implementation of corrective actions to preclude recurrence.</br>The high steam flow isolation signal is considered invalid because: 1) At the time of the event, the unit mode switch was in a mode where PCIS was not required; 2) No steam was being generated; and 3) The water flow past differential pressure instrument generated a false high steam flow signal.</br>The event is being reported in accordance with 50.73(a)(1) and 50.73(a)(2)(iv)(A) as an event or condition that as a result of an invalid initiation signal resulted in the actuation of one or more of the systems listed in paragraph 50.73 (a)(2)(iv)(B).</br>The licensee has notified the NRC Resident Inspector.e has 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>.
00:00:00, 6 July 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>.
02:09:16, 2 March 2018 +
11:38:00, 6 July 2010 +
false +
false +
50.318 d (1,207.63 hours, 7.188 weeks, 1.654 months) +
04:00:00, 17 May 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.