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This 8-hour notification is being made to … This 8-hour notification is being made to report that an Auxiliary Feedwater (AFW) system actuation signal was generated and a Reactor Protective Signal (RPS) generated with the reactor subcritical.</br>On March 27, 2007 at approximately 2050, Salem Unit 1 was in Mode 3 following a planned manual reactor trip to begin a scheduled refueling outage. Operators had established initial Reactor Coolant System cooldown using the steam dumps for heat removal and the 11, 12, and 13 AFW pumps for steam generator make-up. All three pumps had been previously placed in-service in accordance with plant procedures. As plant cooldown proceeded, narrow range levels in 11, 12, and 13 Steam Generators reached the low steam generator setpoint trip, resulting in a valid ESF actuation (i.e., start signal to the AFW pumps); however all AFW pumps were already in-service.</br>The actuation signal also generated a reactor trip signal to be initiated by the reactor protection system; however, the plant was already in a shutdown condition with the reactor trip breakers open.</br>The lowest level during this transient occurred in 13 Steam Generator and was 11.3% narrow range level. Steam generator water level was restored to a normal value and the RCS cooldown recommenced. There were no equipment failures that contributed to this event. </br>The NRC Resident has been informed.vent.
The NRC Resident has been informed. +
00:50:00, 28 March 2007 +
43,259 +
01:51:00, 28 March 2007 +
00:50:00, 28 March 2007 +
This 8-hour notification is being made to … This 8-hour notification is being made to report that an Auxiliary Feedwater (AFW) system actuation signal was generated and a Reactor Protective Signal (RPS) generated with the reactor subcritical.</br>On March 27, 2007 at approximately 2050, Salem Unit 1 was in Mode 3 following a planned manual reactor trip to begin a scheduled refueling outage. Operators had established initial Reactor Coolant System cooldown using the steam dumps for heat removal and the 11, 12, and 13 AFW pumps for steam generator make-up. All three pumps had been previously placed in-service in accordance with plant procedures. As plant cooldown proceeded, narrow range levels in 11, 12, and 13 Steam Generators reached the low steam generator setpoint trip, resulting in a valid ESF actuation (i.e., start signal to the AFW pumps); however all AFW pumps were already in-service.</br>The actuation signal also generated a reactor trip signal to be initiated by the reactor protection system; however, the plant was already in a shutdown condition with the reactor trip breakers open.</br>The lowest level during this transient occurred in 13 Steam Generator and was 11.3% narrow range level. Steam generator water level was restored to a normal value and the RCS cooldown recommenced. There were no equipment failures that contributed to this event. </br>The NRC Resident has been informed.vent.
The NRC Resident has been informed. +
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00:00:00, 28 March 2007 +
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>.
02:16:58, 2 March 2018 +
01:51:00, 28 March 2007 +
false +
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0.0425 d (1.02 hours, 0.00607 weeks, 0.0014 months) +
00:50:00, 28 March 2007 +
Low Steam Generator Water Level Initiated Auxiliary Feedwater Signal and a Reactor Trip Signal +
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