ENS 44920: Difference between revisions
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ENS Event | |
|---|---|
20:32 Mar 19, 2009 | |
| Title | Unplanned Start Of A Cooling Water Pump During Testing |
| Event Description | In preparation for planned maintenance of 12 Diesel Driven Cooling Water Pump (Train A), 121 Cooling Water Pump was aligned as a safeguards replacement pump per plant procedures. Maintenance steps were then completed to a point allowing testing and 12 DDCLP was restored. The Operations procedure steps to enter the Cooling Water LCO 3.7.8 Condition A and realign 121 CL Pump away from being a safeguards replacement were missed and permission was granted to perform testing. 12 DDCLP was locally started per the PM and then tripped as directed from rated speed at 1513. The pump trip resulted in a cooling water pressure transient that automatically started 121 CLP and is reportable under 10CFR 50.72(b)(3) as an unplanned safety related system actuation. 121 CLP operated normally and there were no adverse plant effects from the transient.
During the investigation of the automatic start, it was recognized that with 121 CLP still aligned as a safeguards replacement and 12 DDCLP running locally, a Safety Injection signal and start of 22 Diesel Driven Cooling Water Pump (Train B) would result in 121 CLP trip. LCO 3.7.8 Condition A was entered for one safeguards pump OOS and 121 CLP was returned to OPERABLE status at 1613. 121 Cooling Water Pump was shut down and returned to standby at 1936. Maintenance activities and testing for 12 DDCLP have been suspended pending investigation and corrective actions. 121 CLP remains aligned as a safeguards replacement and both cooling water headers have operable safeguards pumps. The licensee notified the NRC Resident Inspector.
The licensee has completed its initial investigation and corrective actions. Maintenance and testing activities for 12 Diesel Driven Cooling Water Pump has resumed. There was an error in the text of the initial notification, the time of the autostart of 121 Motor Driven Cooing Water Pump was 1532 not 1513. The licensee informed the NRC Resident Inspector. Notified R3DO (Ring). |
| Where | |
|---|---|
Prairie Island  Minnesota (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+1.12 h0.0467 days <br />0.00667 weeks <br />0.00153 months <br />) | |
| Opened: | John Kempkes 21:39 Mar 19, 2009 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Mar 20, 2009 |
| 44920 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 578132025-07-16T14:59:00016 July 2025 14:59:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip ENS 574042024-10-29T15:23:00029 October 2024 15:23:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip ENS 570032024-03-03T17:42:0003 March 2024 17:42:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Loss of Main Feedwater Pump Suction ENS 568032023-10-19T16:10:00019 October 2023 16:10:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip ENS 565432023-05-27T23:34:00027 May 2023 23:34:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Notification of Unusual Event Due to Multiple Fire Alarms in Containment Not Verified within 15 Minutes ENS 555032021-10-03T20:25:0003 October 2021 20:25:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Specified System Actuation ENS 548592020-08-26T18:19:00026 August 2020 18:19:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Flux Rate ENS 534082018-05-17T16:15:00017 May 2018 16:15:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Actuation of Emergency Diesel Generator ENS 516092015-12-17T19:18:00017 December 2015 19:18:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declared Due to Fire Alarm in Containment Not Verified within 15 Minutes ENS 511362015-06-07T12:35:0007 June 2015 12:35:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Resulting from Turbine Trip on Low Oil Pressure ENS 511072015-06-01T03:20:0001 June 2015 03:20:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip Due to Trip of Condensate and Main Feedwater Pump ENS 509502015-04-03T11:52:0003 April 2015 11:52:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Scram Due to Loss of Main Feedwater Pump ENS 502212014-06-23T16:07:00023 June 2014 16:07:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Emergency Diesel Generator Auto Start Due to Degraded Bus Voltage Signal ENS 481862012-08-14T08:12:00014 August 2012 08:12:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Based on Both Emergency Diesels Being Declared Inoperable ENS 470172011-07-01T20:52:0001 July 2011 20:52:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unit 1 Manual Trip Due to Electro-Hydraulic Control Fluid Leak on Turbine Stop Valve ENS 468302011-05-09T12:22:0009 May 2011 12:22:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Upon Turbine Trip Due to Main Generator Lockout ENS 459522010-05-25T08:14:00025 May 2010 08:14:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Automatic Reactor Trip Due to Turbine Trip ENS 450772009-05-18T18:05:00018 May 2009 18:05:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Turbine Trip/Reactor Trip Due to Condenser Vacuum ENS 449202009-03-19T20:32:00019 March 2009 20:32:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unplanned Start of a Cooling Water Pump During Testing ENS 443772008-07-31T13:17:00031 July 2008 13:17:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Reactor Trip During Testing ENS 425042006-04-14T19:25:00014 April 2006 19:25:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Manual Reactor Trip Due to Condensate Pump and Feedwater Pump Trip 2025-07-16T14:59:00 | |
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