ENS 45472
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ENS Event | |
|---|---|
12:12 Nov 2, 2009 | |
| Title | Loss of Shutdown Cooling |
| Event Description | On 11/2/09 at 0712 shutdown cooling (SDC) was lost on Dresden Unit 2 when a recirculation loop temperature element (2-0260-13B) failed upscale. Unit 2 was in the process of initial cooldown for entry into a refueling outage. Recirculation loop temperature was approximately 224 degrees F based on alternate indications. The circuitry was jumpered out and SDC was restarted at 0748. The Recirculation loop temperature was at 260 degrees F upon restart. At 0835, the reactor entered Mode 4 (i.e., Recirculation loop temperature less than or equal to 212 degrees F and Mode Switch in Shutdown). This event is reportable under 10CFR 50.72(b)(3)(v)(B). This event is being reported based on lessons learned from industry experience and is undergoing further review.
The licensee notified NRC Resident Inspector. |
| Where | |
|---|---|
Dresden  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
| Time - Person (Reporting Time:+2.18 h0.0908 days <br />0.013 weeks <br />0.00299 months <br />) | |
| Opened: | Chris Kent 14:23 Nov 2, 2009 |
| NRC Officer: | Vince Klco |
| Last Updated: | Nov 2, 2009 |
| 45472 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Shutdown (0 %) |
| After | Hot Shutdown (0 %) |
WEEKMONTHYEARENS 578412025-07-30T21:45:00030 July 2025 21:45:00
[Table view]10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Potential Inoperability of Residual Heat Removal (RHR) System ENS 560232022-07-30T03:17:00030 July 2022 03:17:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat RHR Capability Lost Due to Suction Bay Level ENS 480802012-07-10T07:36:00010 July 2012 07:36:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Invalid Group 5 Isolation Due to Failed Test Switch During Surveillance ENS 468572011-05-17T15:30:00017 May 2011 15:30:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Temporary Blockage of Suction Source for Containment Cooling Service Water ENS 454722009-11-02T12:12:0002 November 2009 12:12:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Loss of Shutdown Cooling ENS 446262008-11-03T12:52:0003 November 2008 12:52:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Recirc Loop Temperature Element Failed ENS 444702008-09-07T13:05:0007 September 2008 13:05:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Isolation Condenser Declared Inoperable Following Surveillance Testing ENS 441402008-04-15T12:00:00015 April 2008 12:00:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection Declared Inoperable ENS 413702005-02-04T01:15:0004 February 2005 01:15:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 4160 Volt Relaying and Metering Single Failure Vulnerability ENS 407032004-04-24T15:50:00024 April 2004 15:50:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Isolation Condenser Declared Inoperable 2025-07-30T21:45:00 | |
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