ENS 47142: Difference between revisions
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| event date = 08/11/2011 03:27 CDT | | event date = 08/11/2011 03:27 CDT | ||
| last update date = 08/11/2011 | | last update date = 08/11/2011 | ||
| title = Initiation | | title = Initiation of Technical Specification Required Shutdown | ||
| event text = 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. | | event text = 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. | 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. | ||
Latest revision as of 21:06, 1 March 2018
| Where | |
|---|---|
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 |
| 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
| |
Duane Arnold with 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 | |