ENS 42959
ENS Event | |
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19:36 Nov 2, 2006 | |
Title | High Pressure Safety Injection (Hpsi) Pumps Alignment Blocks Improperly Installed |
Event Description | At 1436 hours0.0166 days <br />0.399 hours <br />0.00237 weeks <br />5.46398e-4 months <br /> on November 2, 2006, with the plant in Mode 3, it was determined that less than 100% of the required Emergency Core Cooling System (ECCS) flow was available per Technical Specification (TS) 3.5.2.D. Therefore, TS LCO 3.0.3 was entered.
Each High Pressure Safety Injection (HPSI) pump (one in each ECCS train) is designed with alignment blocks in its mounting, which ensures pump and motor alignment for the thermal expansion experienced by the pump upon initiation of sump recirculation flow. These alignment blocks ( 2 per pump) were discovered to be improperly installed, or missing altogether. In this condition, the HPSI pump could potentially be rendered inoperable upon initiation of sump recirculation. This condition is reportable in accordance with 10CFR 50.72(b)(3)(ii)(B) and (b)(3)(v)(D) as an unanalyzed condition, and a condition that could have prevented the fulfillment of the safety function of the HPSI pumps to mitigate the consequences of an accident, respectively. The NRC Resident Inspector was notified of this event by the licensee.
EN # 42959 reported on November 2, 2006 that both Emergency Core Cooling System Trains were inoperable. The reason for that determination involved the observation that the alignment blocks [keys] associated with the mounting of the high pressure safety injection (HPSI) pumps were either incorrectly installed or were missing. The alignment keys were believed to be necessary to ensure appropriate HPSI pump and motor alignment for the thermal expansion experienced upon initiation of sump recirculation flow. The condition was reported as an unanalyzed condition and a condition that could have prevented the fulfillment of the safety function of the HPSI pumps to mitigate the consequences of an accident. Subsequently, further evaluation of the HPSI pump mounting configuration determined that the alignment keys are not required for pump operability. Therefore, there was no unanalyzed condition and no condition that could have prevented the fulfillment of the safety function of the HPSI pumps to mitigate the consequences of an accident. The licensee notified the NRC Resident Inspector. R3DO(Cameron) notified. |
Where | |
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Palisades ![]() Michigan (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+-0.43 h-0.0179 days <br />-0.00256 weeks <br />-5.89014e-4 months <br />) | |
Opened: | Dan Malone 19:10 Nov 2, 2006 |
NRC Officer: | John Mackinnon |
Last Updated: | Nov 10, 2006 |
42959 - NRC Website
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Unit 1 | |
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Reactor critical | Not Critical |
Scram | No |
Before | Hot Standby (0 %) |
After | Hot Standby (0 %) |
Palisades ![]() | |
WEEKMONTHYEARENS 553112021-06-16T19:50:00016 June 2021 19:50:00
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