29 décembre 2014
Cette indisponibilité a été déclarée suite à la découverte d’une fuite sur le corps de la pompe à eau n° 3 entrainée par un diesel. Ce système n’étant pas doublé, la fonction d’injection haute pression n’aurait pas été remplie en cas de nécessité sur le réacteur n° 2.
Type : BWR Mark 2 - Puissance : 3 456 MWth - Première divergence : 03/1984
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Event Number : 50707
Facility : LASALLE - State : IL
Unit : [2] - RX Type : [2] GE-5
Event Date : 12/29/2014 - Event Time : 23:30
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Initial PWR : 100 % Current PWR : 100 %
Event Text
HIGH PRESSURE CORE SPRAY DECLARED INOPERABLE DUE TO LEAK ON DIVISION 3 DIESEL GENERATOR COOLING WATER PUMP
"This report is being made pursuant to 10CFR50.72(b)(3)(v)(D), Event or Condition that could have prevented fulfillment of a Safety Function needed to Mitigate the Consequences of an Accident. During routine surveillance testing of the Unit 2 Division 3 Emergency Diesel Generator (LOS-DG-M3) a small pinhole leak was identified in the pump casing of the Division 3 Diesel Generator Cooling Water Pump. This condition has been evaluated and the Division 3 Diesel Generator Cooling Water Pump has been declared inoperable. The Division 3 Diesel Generator Cooling Water Pump is a support system for the Division 3 Emergency Diesel Generator and the High Pressure Core Spray System (HPCS). The required actions of Technical Specification (TS) 3.5.1 were entered on 12/29/14 at 2330 [CST] when the HPCS system was determined to be inoperable. This condition could have prevented the High Pressure Core Spray System (HPCS), a single train safety system, from performing its design function."
The licensee notified the NRC Resident Inspector.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20141231en.html#en50707
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