Browse wiki
Jump to navigation
Jump to search
32 +
On 04/29/08 at approximately 2313 during t … On 04/29/08 at approximately 2313 during testing of the Unit 1 HPCI system, a main pump seal developed a leak requiring the HPCI system to be secured. HPCI testing was in progress per OPT 09.2, HPCI System Operability Test, following recent Unit 1 refueling outage. At the time of discovery, the Unit 1 HPCI system had been declared inoperable due to surveillance testing activities which removed HPCI from the standby lineup. When the pump seal leak developed, operators secured HPCI and isolated the leak by closing the pump suction isolation valves and the keep fill supply valves. Investigation into the cause of the pump seal leakage is underway and the Unit 1 HPCI system will be placed under clearance for repair.</br>The initial safety significance of this condition is considered to be minimal. The Reactor Core Isolation Cooling (RCIC) system as well as the other Unit 1 ECCS systems are operable at this time. Actions have been taken to protect redundant safety systems.</br>The Unit 1 HPCI system has been removed from service and secured. Investigation is underway to determine the cause of the HPCI main pump leakage. The HPCI system will be placed under clearance for repair.</br>The licensee notified the NRC Resident Inspector.</br>* * * RETRACTION ON 7/31/08 AT 1447 EDT FROM TURKAL TO HUFFMAN * * * </br>The HPCI pump uses seal purge water piping in combination with mechanical seals to limit shaft leakage. Investigation of this event found that inadequate post-maintenance venting of piping between the discharge of the HPCI booster pump and the suction of the HPCI main pump led to the seal faces overheating and subsequent failure. The failure of the seal and the leakage associated with it would not have prevented HPCI from performing its required functions. Water intrusion into the oil system is the limiting impact of the seal failure. The HPCI main pump seal failure event has been evaluated and it was determined that, given a worst-case seal failure, the HPCI pump would be able to operate for greater than the required 4.1 hours and, thereby, satisfy its accident, as well as transient, response requirements. On this basis, the HPCI system was capable of performing its function to mitigate the consequences of an accident and the issue is not reportable under 10 CFR 50.72(b)(3)(v)(D).</br>Investigation of this condition is documented in the corrective action program in Nuclear Condition Report (NCR) 277188.</br>The NRC resident was notified of this retraction.</br>The R2DO (Henson) has been notified.tion.
The R2DO (Henson) has been notified.
03:13:00, 30 April 2008 +
44,179 +
05:21:00, 30 April 2008 +
03:13:00, 30 April 2008 +
On 04/29/08 at approximately 2313 during t … On 04/29/08 at approximately 2313 during testing of the Unit 1 HPCI system, a main pump seal developed a leak requiring the HPCI system to be secured. HPCI testing was in progress per OPT 09.2, HPCI System Operability Test, following recent Unit 1 refueling outage. At the time of discovery, the Unit 1 HPCI system had been declared inoperable due to surveillance testing activities which removed HPCI from the standby lineup. When the pump seal leak developed, operators secured HPCI and isolated the leak by closing the pump suction isolation valves and the keep fill supply valves. Investigation into the cause of the pump seal leakage is underway and the Unit 1 HPCI system will be placed under clearance for repair.</br>The initial safety significance of this condition is considered to be minimal. The Reactor Core Isolation Cooling (RCIC) system as well as the other Unit 1 ECCS systems are operable at this time. Actions have been taken to protect redundant safety systems.</br>The Unit 1 HPCI system has been removed from service and secured. Investigation is underway to determine the cause of the HPCI main pump leakage. The HPCI system will be placed under clearance for repair.</br>The licensee notified the NRC Resident Inspector.</br>* * * RETRACTION ON 7/31/08 AT 1447 EDT FROM TURKAL TO HUFFMAN * * * </br>The HPCI pump uses seal purge water piping in combination with mechanical seals to limit shaft leakage. Investigation of this event found that inadequate post-maintenance venting of piping between the discharge of the HPCI booster pump and the suction of the HPCI main pump led to the seal faces overheating and subsequent failure. The failure of the seal and the leakage associated with it would not have prevented HPCI from performing its required functions. Water intrusion into the oil system is the limiting impact of the seal failure. The HPCI main pump seal failure event has been evaluated and it was determined that, given a worst-case seal failure, the HPCI pump would be able to operate for greater than the required 4.1 hours and, thereby, satisfy its accident, as well as transient, response requirements. On this basis, the HPCI system was capable of performing its function to mitigate the consequences of an accident and the issue is not reportable under 10 CFR 50.72(b)(3)(v)(D).</br>Investigation of this condition is documented in the corrective action program in Nuclear Condition Report (NCR) 277188.</br>The NRC resident was notified of this retraction.</br>The R2DO (Henson) has been notified.tion.
The R2DO (Henson) has been notified.
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>.
32 +
00:00:00, 31 July 2008 +
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>.
02:13:57, 2 March 2018 +
05:21:00, 30 April 2008 +
true +
false +
0.0888 d (2.13 hours, 0.0127 weeks, 0.00292 months) +
03:13:00, 30 April 2008 +
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.