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This event is being reported as 10CFR50.72 … This event is being reported as 10CFR50.72(b)(3)(ii)(B), an unanalyzed condition that significantly degrades plant safety. A postulated fire water system line break did not take into consideration the movement of a fire door boundary. Consequently, the break may affect safe shutdown of the plant. The door boundary was moved in May 1999.</br>While assessing a calculation to update fire pump curves (CR 04-00422-04) it was found that the calculation does not appear to have been updated for the tornado depressurization event modifications (DCP 99-05014). Specifically, door DG-112 was moved to the control complex wall from the diesel generator wall. This door movement isolates the rattle space that was previously credited as a relief path for this internal flood.</br>A full break is postulated for this line as the result of a safe shutdown earthquake. As the result of the postulated pipe break, both fire protection pumps are expected to auto start resulting in a break flow rate into the hallway of approximately 6,000 gpm. Standard Perry design practice is to assume a 30 minute duration for the pipe break flow isolation unless justified otherwise.</br>The line in question was isolated at 2027 on 10/21/05. The valves are being maintained closed under administrative controls.</br>The licensee notified the NRC Resident Inspector.</br>**** RETRACTION ON 10/28/05 AT 1748 EDT FROM H. KELLY TO P. SNYDER ****</br>An 8-hour notification was made on October 24, 2005 under 10 CFR 50.72(b)(3)(ii)(B) for an unanalyzed condition that significantly degrades plant safety. The report was made due to a postulated break for a non-safety non-seismic fire water pipe that could possibly affect safe shutdown of the plant.</br>An evaluation was completed on October 28, 2005. This evaluation confirmed that the current plant configuration is consistent with the design basis. The evaluation used for the original event notification assumed a full break of the involved piping. Perry design basis for this moderate energy system is a leakage crack. The postulated leakage from the crack in the piping remains within design basis and does not significantly degrade plant safety. Since Perry remains in compliance with design basis and there is no unanalyzed condition that significantly degrades plant safety, there is no reportable condition. Therefore, ENF 42072 is retracted.</br>The licensee notified the NRC Resident Inspector. Notified R3DO (Lipa).Resident Inspector. Notified R3DO (Lipa).
13:00:00, 21 October 2005 +
12:41:00, 24 October 2005 +
13:00:00, 21 October 2005 +
This event is being reported as 10CFR50.72 … This event is being reported as 10CFR50.72(b)(3)(ii)(B), an unanalyzed condition that significantly degrades plant safety. A postulated fire water system line break did not take into consideration the movement of a fire door boundary. Consequently, the break may affect safe shutdown of the plant. The door boundary was moved in May 1999.</br>While assessing a calculation to update fire pump curves (CR 04-00422-04) it was found that the calculation does not appear to have been updated for the tornado depressurization event modifications (DCP 99-05014). Specifically, door DG-112 was moved to the control complex wall from the diesel generator wall. This door movement isolates the rattle space that was previously credited as a relief path for this internal flood.</br>A full break is postulated for this line as the result of a safe shutdown earthquake. As the result of the postulated pipe break, both fire protection pumps are expected to auto start resulting in a break flow rate into the hallway of approximately 6,000 gpm. Standard Perry design practice is to assume a 30 minute duration for the pipe break flow isolation unless justified otherwise.</br>The line in question was isolated at 2027 on 10/21/05. The valves are being maintained closed under administrative controls.</br>The licensee notified the NRC Resident Inspector.</br>**** RETRACTION ON 10/28/05 AT 1748 EDT FROM H. KELLY TO P. SNYDER ****</br>An 8-hour notification was made on October 24, 2005 under 10 CFR 50.72(b)(3)(ii)(B) for an unanalyzed condition that significantly degrades plant safety. The report was made due to a postulated break for a non-safety non-seismic fire water pipe that could possibly affect safe shutdown of the plant.</br>An evaluation was completed on October 28, 2005. This evaluation confirmed that the current plant configuration is consistent with the design basis. The evaluation used for the original event notification assumed a full break of the involved piping. Perry design basis for this moderate energy system is a leakage crack. The postulated leakage from the crack in the piping remains within design basis and does not significantly degrade plant safety. Since Perry remains in compliance with design basis and there is no unanalyzed condition that significantly degrades plant safety, there is no reportable condition. Therefore, ENF 42072 is retracted.</br>The licensee notified the NRC Resident Inspector. Notified R3DO (Lipa).Resident Inspector. Notified R3DO (Lipa).
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>.
100 +
00:00:00, 28 October 2005 +
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>.
02:19:58, 2 March 2018 +
12:41:00, 24 October 2005 +
true +
false +
2.987 d (71.68 hours, 0.427 weeks, 0.0982 months) +
13:00:00, 21 October 2005 +
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.