Browse wiki
Jump to navigation
Jump to search
On February 15, 2001 at 1417 hours, while … On February 15, 2001 at 1417 hours, while at approximately 100 percent power, a low vacuum trip on the Unit 1 east main feedwater pump turbine occurred. The operator manually tripped the reactor in accordance with plant procedures. The post trip investigation indicated that all safety related systems performed as designed.</br></br>Prior to the event, the main feedpump water box differential pressure and backpressure was being monitored on an increased frequency due to a rising trend on both parameters. The previous shift had attempted to improve this condition by flushing the circulating water side of the main condenser waterboxes. A downpower had been previously scheduled to allow cleaning of the main feedwater condenser. However, the fouling occurred more rapidly than anticipated. T In accordance with 10 CFR 50.72 (b)(3)(iv)(B)(1), a four-hour ENS notification was made to the NRC at 1545 hours on February 15, 2001, as an event or condition that resulted in an actuation of the reactor protection system when the reactor is critical.</br></br>The cause of the feedwater pump trip was loss of condenser vacuum as the result of corrosion scales obstructing flow at the condensers inlet-side tubesheet. This condition lead to an elevated condenser backpressure and a subsequent low vacuum trip of the east main feedwater pump.</br></br>The feedwater pump turbines are non-safety related, non-safety interface, balance of plant equipment. T The function of providing feedwater flow to support power operation is not a safety related or accident mitigating function. Therefore, with respect to the main feedwater system, this condition has no safety significance. T Following the reactor trip, both the east and west main feed pump condensers were opened and cleaned.</br></br>Between March 30 and April 1, 2001, Units 1 and 2 respectively were reduced to approximately 60 percent power to clean and inspect the feed pump condensers. No new scale formation was observed.sers. No new scale formation was observed. +
On February 15, 2001 at 1417 hours, while … On February 15, 2001 at 1417 hours, while at approximately 100 percent power, a low vacuum trip on the Unit 1 east main feedwater pump turbine occurred. The operator manually tripped the reactor in accordance with plant procedures. The post trip investigation indicated that all safety related systems performed as designed.</br></br>Prior to the event, the main feedpump water box differential pressure and backpressure was being monitored on an increased frequency due to a rising trend on both parameters. The previous shift had attempted to improve this condition by flushing the circulating water side of the main condenser waterboxes. A downpower had been previously scheduled to allow cleaning of the main feedwater condenser. However, the fouling occurred more rapidly than anticipated. T In accordance with 10 CFR 50.72 (b)(3)(iv)(B)(1), a four-hour ENS notification was made to the NRC at 1545 hours on February 15, 2001, as an event or condition that resulted in an actuation of the reactor protection system when the reactor is critical.</br></br>The cause of the feedwater pump trip was loss of condenser vacuum as the result of corrosion scales obstructing flow at the condensers inlet-side tubesheet. This condition lead to an elevated condenser backpressure and a subsequent low vacuum trip of the east main feedwater pump.</br></br>The feedwater pump turbines are non-safety related, non-safety interface, balance of plant equipment. T The function of providing feedwater flow to support power operation is not a safety related or accident mitigating function. Therefore, with respect to the main feedwater system, this condition has no safety significance. T Following the reactor trip, both the east and west main feed pump condensers were opened and cleaned.</br></br>Between March 30 and April 1, 2001, Units 1 and 2 respectively were reduced to approximately 60 percent power to clean and inspect the feed pump condensers. No new scale formation was observed.sers. No new scale formation was observed. +
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>.
1 +
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>.
05:26:37, 1 December 2017 +
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.