ENS 47142
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ENS Event | |
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08:27 Aug 11, 2011 | |
Title | Initiation of Technical Specification Required Shutdown |
Event Description | At 0327 [CDT] on August 11, 2011, NextEra Energy Duane Arnold commenced a reactor shutdown as required by TS 3.7.2.B for both River Water Supply subsystems inoperable. At 0008 [CDT], both River Water Supply subsystems were declared inoperable as a result of high differential pressure across the intake travelling screens. TS 3.7.2.B requires that one River Water Supply subsystem be restored or commence reactor shutdown. While the River Water Supply system is currently supplying rated flow, high differential pressure across the travelling screens indicates the potential for eventual degraded flow. This event is being reported pursuant to the requirements of 10 CFR 50.72(b)(2)(i), as a TS required shutdown.
Additionally, the current condition of both trains of River Water Supply inoperable also potentially affects the plant capability to remove residual heat. Therefore, this event is also being reported under 10 CFR 50.72(b )(3)(v)(B), as an event that could prevent fulfillment of a safety function. The NRC Resident Inspector has been notified. |
Where | |
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Duane Arnold ![]() Iowa (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
LER: | 05000331/LER-2011-002 Regarding Loss of Ultimate Heat Sink and Completion of Technical Specification Required Shutdown |
Time - Person (Reporting Time:+-1.42 h-0.0592 days <br />-0.00845 weeks <br />-0.00195 months <br />) | |
Opened: | Jeffrey A. Miell 07:02 Aug 11, 2011 |
NRC Officer: | Steve Sandin |
Last Updated: | Aug 11, 2011 |
47142 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (68 %) |
Duane Arnold ![]() | |
WEEKMONTHYEARENS 475112011-12-02T19:11:0002 December 2011 19:11:00
[Table view]10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Low Pressure Coolant Injection Inoperable ENS 474482011-11-16T22:22:00016 November 2011 22:22:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Rhr Capability Affected Due to Both Trains of River Water Supply Hvac Systems Inoperable ENS 471422011-08-11T08:27:00011 August 2011 08:27:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Initiation of Technical Specification Required Shutdown ENS 464102010-11-10T11:18:00010 November 2010 11:18:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Rhr Pump Tripped While Operating in Shutdown Cooling Mode ENS 431852007-02-24T23:56:00024 February 2007 23:56:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Loss of Normal Electrical Lineup Due to Grid Instability from Adverse Weather Conditions ENS 426802006-07-01T04:37:0001 July 2006 04:37:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Common Cause Degradation to Rhr Service Water Pump Motor Cooling Coils 2011-08-11T08:27:00 | |
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