ENS 52869

v t e ENS Event
23:47 May 25, 2017
Title	Invalid High Pressure Core Spray (Hpcs) System Actuation In Mode 5
Event Description	At 1647 [PDT] on May 25, 2017, during the performance of a post-maintenance test for replacement of a Reactor Pressure Vessel (RPV) low water level 3 indicator switch (MS-LIS-24A), a pressure perturbation in the common pressure reference line resulted in tripping of the RPV Level 2 instruments and an unplanned start of High Pressure Core Spray (HPCS) pump (HPCS-P-1) and its supporting emergency diesel (DG3). The Reactor Pressure Vessel was flooded up during the refueling outage, thus, the actuations of the HPCS pump and its supporting emergency diesel (DG3) were unplanned and invalid. The HPCS pump did not inject into the RPV due to the RPV level being above Level 8 which is an interlock to close the HPCS RPV injection valve (HPCS-V-4). During the event, the single train HPCS system initiated normally but did not inject into the reactor pressure vessel as expected due to flooded-up conditions of the reactor pressure vessel for refueling outage activities. The emergency diesel generator started normally in response to the initiation signal of HPCS. Both HPCS and the emergency diesel generator functioned successfully. All systems responded in conformance with their design and there was no safety significance associated with this event. At the time of the event, the licensee notified the NRC Resident [Inspector].

ENS 52869 +/-
Where
Columbia Generating Station Washington (NRC Region 4)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1429.82 h59.576 days <br />8.511 weeks <br />1.959 months <br />)
Opened:	Sandra Christianson 13:36 Jul 24, 2017
NRC Officer:	Dong Park
Last Updated:	Jul 24, 2017
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v • d • e

v t e Emergency Notification System
Columbia with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2023-05-17T10:39:00 [Table view]
[ENS list for Columbia]

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