ENS 48080
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ENS Event | |
|---|---|
07:36 Jul 10, 2012 | |
| Title | Invalid Group 5 Isolation Due to Failed Test Switch During Surveillance |
| Event Description | At 0236 CDT on Tuesday, July 10 2012, the Dresden Nuclear Power Station (DNPS) U3 Isolation Condenser System automatically isolated due to a inadvertent partial Group 5 Primary Containment Isolation System (PCIS) isolation, causing the inboard isolation valves to close. The PCIS isolation was caused during the performance of DIS 1300-07, 'U3 Isolation Condenser Steam/Condensate Line High Flow Calibration,' due to a failed test switch. The test switch failed to bypass the PCIS signal generated during the surveillance. All valves responded as expected due to this condition.
The isolation condenser was declared inoperable and Technical Specification 3.5.3, Condition A was entered. HPCI was verified to be operable to satisfy the requirements of TS 3.5.3, Condition A.2. This condition is reportable under 10 CFR 50.72(b)(3)(v)(B) due to a condition occurring that could have prevented fulfillment of a safety function needed for residual heat removal. The licensee notified the 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:+2.9 h0.121 days <br />0.0173 weeks <br />0.00397 months <br />) | |
| Opened: | Dan Miller 10:30 Jul 10, 2012 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Jul 10, 2012 |
| 48080 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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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