Browse wiki
Jump to navigation
Jump to search
465D, the first-off low side root isolatio … 465D, the first-off low side root isolation valve for the Point Beach Nuclear Plant Unit 2 "A" steam generator steam line flow transmitter. The leak location could not be isolated from the main steam line. The affected portion of the main steam line is credited as a closed system boundary for containment penetration P-1, the "A" main steam line penetration. Accordingly, Technical Specification (TS) Condition 3.6.3.C, which is applicable to penetration flow paths with only one containment isolation valve and a closed system, was entered and Required Action C.1 was initiated. The required action for this condition is to isolate the affected penetration flow path with a completion time of 72 hours. The repair of the leak would require a shutdown and cooldown of Unit 2 and could not be accomplished within that 72 hour time frame; therefore, a reactor shutdown and cooldown was promptly initiated. This was considered to be a TS required shutdown and was reported in accordance with 10 CFR 50.72.(b)(2)(i). Unit 2 entered Mode 5 on November 21, 2004, and the valve body leak was repaired. Unit 2 returned to full power operation on November 25, 2004. The cause of the leak was determined to be either a material defect in the valve body or an improper welding process, which provided a stress riser that failed due to cyclic loading. An assessment of the safety significance of this event concluded that the impact of this event on the health and safety of the public was not significant. safety of the public was not significant. +
November 19, 2004 +
465D, the first-off low side root isolatio … 465D, the first-off low side root isolation valve for the Point Beach Nuclear Plant Unit 2 "A" steam generator steam line flow transmitter. The leak location could not be isolated from the main steam line. The affected portion of the main steam line is credited as a closed system boundary for containment penetration P-1, the "A" main steam line penetration. Accordingly, Technical Specification (TS) Condition 3.6.3.C, which is applicable to penetration flow paths with only one containment isolation valve and a closed system, was entered and Required Action C.1 was initiated. The required action for this condition is to isolate the affected penetration flow path with a completion time of 72 hours. The repair of the leak would require a shutdown and cooldown of Unit 2 and could not be accomplished within that 72 hour time frame; therefore, a reactor shutdown and cooldown was promptly initiated. This was considered to be a TS required shutdown and was reported in accordance with 10 CFR 50.72.(b)(2)(i). Unit 2 entered Mode 5 on November 21, 2004, and the valve body leak was repaired. Unit 2 returned to full power operation on November 25, 2004. The cause of the leak was determined to be either a material defect in the valve body or an improper welding process, which provided a stress riser that failed due to cyclic loading. An assessment of the safety significance of this event concluded that the impact of this event on the health and safety of the public was not significant. safety of the public was not significant. +
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>.
3 +
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>.
05:31:18, 1 December 2017 +
January 14, 2005 +
November 19, 2004 +
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.