ENS 51006
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ENS Event | |
|---|---|
15:50 Apr 23, 2015 | |
| Title | Safety Systems Declared Inoperable Due to Equipment Malfunction |
| Event Description | At 1050 [CDT] on 4/23/2015, an equipment malfunction resulted in DAEC [Duane Arnold Energy Center] declaring the Division 1 Essential Electrical Bus inoperable. The LPCI [ Low Pressure Coolant Injection] system was inoperable but available as part of a planned evolution at the time of the malfunction. Declaring the Essential Electrical Bus inoperable caused the 'A' Core Spray System to be considered inoperable. LPCI and 'A' Core Spray being inoperable simultaneously constituted a loss of safety function. The 'B' Core Spray system remained operable and available. The equipment malfunction was resolved promptly, allowing the Division 1 Essential Electrical Bus to be returned to an operable status.
The notification is being made pursuant to 10 CFR 50.72(b)(3)(v)(D). The [NRC] Resident Inspector has been notified. The licensee entered and exited TS LCO 3.5.1 condition B.
The purpose of this notification is to retract a previous report made on 4/23/15 at 1851 EDT (EN 51006). Notification to the NRC was initially made as a result of an event or condition that could prevent the fulfillment of the safety function of Emergency Core Cooling System (ECCS) due to an equipment malfunction associated with the Division 1 Essential Electrical Bus Breaker 1A306. Subsequent to the initial report, NextEra Energy Duane Arnold (NextEra) has determined that the Division 1 Essential Electrical Bus was fully capable of performing its intended safety function with the malfunction on Bus Breaker 1A306. Therefore, this event is not considered a Safety System Functional Failure and is not reportable to the NRC as a Licensee Event Report (LER) per 10 CFR 50.73. The NRC Resident Inspector has been notified. Notified R3DO (Skokowski). |
| Where | |
|---|---|
Duane Arnold  Iowa (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+3.02 h0.126 days <br />0.018 weeks <br />0.00414 months <br />) | |
| Opened: | Mark Dickerson 18:51 Apr 23, 2015 |
| NRC Officer: | Dong Park |
| Last Updated: | May 8, 2015 |
| 51006 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Duane Arnold with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
WEEKMONTHYEARENS 528812017-08-01T14:34:0001 August 2017 14:34:00
[Table view]10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection Steam Supply Valve Failed to Reposition ENS 516972016-01-29T15:20:00029 January 2016 15:20:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Offsite Power Declared Inoperable Due to Lowering Generator Voltage ENS 510062015-04-23T15:50:00023 April 2015 15:50:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Safety Systems Declared Inoperable Due to Equipment Malfunction ENS 508912015-03-13T17:30:00013 March 2015 17:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Low Pressure Coolant Injection Declared Inoperable ENS 501542014-05-30T15:43:00030 May 2014 15:43:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection Pump Received an Invalid Isolation Signal ENS 495662013-11-21T08:29:00021 November 2013 08:29:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Diesel Generator Inoperability ENS 480642012-07-02T20:05:0002 July 2012 20:05:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable ENS 475612011-12-30T02:09:00030 December 2011 02:09:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Lpci Instrumentation Required Repair and Recalibration ENS 466452011-02-26T15:48:00026 February 2011 15:48:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System Inoperable ENS 450102009-04-23T00:45:00023 April 2009 00:45:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection (Hpci) System Declared Inoperable ENS 436922007-10-05T09:08:0005 October 2007 09:08:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Loss of Both Emergency Service Water Pumps ENS 436022007-08-27T05:00:00027 August 2007 05:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident One Channel of Low Main Steam Line Pressure Signal Mistakenly Removed from Service for 33 Minutes ENS 433312007-05-01T01:17:0001 May 2007 01:17:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable Due to Primary Containment Nitrogen Leak ENS 432622007-03-28T18:41:00028 March 2007 18:41:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Inoperable Due to Surveillance Test Failure ENS 431612007-02-12T16:52:00012 February 2007 16:52:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Standby Filter Units Inoperable ENS 431182007-01-24T15:55:00024 January 2007 15:55:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Missing Pipe Clamp Bolt Found on High Pressure Coolant Injection (Hpci) System ENS 428352006-09-08T09:01:0008 September 2006 09:01:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Containment Atmospheric Dilution (Cad) System Inoperable ENS 420252005-09-29T20:34:00029 September 2005 20:34:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection (Hpci) Declared Inoperable 2017-08-01T14:34:00 | |
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