ENS 47142

v t e ENS Event
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.

ENS 47142 +/-
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 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 Loading map...
v • d • e

v t e Emergency Notification System
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
WEEKMONTHYEAR2011-08-11T08:27:00 [Table view]
[ENS list for Duane Arnold]

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