ENS 46868
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ENS Event | |
|---|---|
23:00 May 20, 2011 | |
| Title | Unanalyzed Condition Marine Life Inside Afw Piping |
| Event Description | The past operability of the 2A train of Auxiliary Feedwater has been called into question based on finding clam shells in the safety related water source piping. During performance of valve strokes on 5/9/2011 per an Operations Department surveillance, clam shells were found while draining a section of the safety related water source piping. System Engineering collected the shells as part of troubleshooting. Based on analysis performed by System Engineering, the 2A Train of Auxiliary Feedwater was not operable with clam shells in the pipe. The amount of shells present would have caused an unacceptable differential pressure across the 2A train Auxiliary Feedwater System flow control valves. The extent of condition has been evaluated for the other Auxiliary Feedwater trains for both units and it has been determined that the only affected train is 2A. The 2B Auxiliary Feedwater train has also been inoperable at various times over the past 3 years for maintenance.
The clams were flushed out of the 2A Train Auxiliary Feedwater suction piping during a recent refueling outage and both trains of Auxiliary Feedwater on Unit 2 are operable. The licensee has not implemented any compensatory measures nor are they in any LCO's as a result this event. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Braidwood  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-0.05 h-0.00208 days <br />-2.97619e-4 weeks <br />-6.849e-5 months <br />) | |
| Opened: | Peter Moodie 22:57 May 20, 2011 |
| NRC Officer: | Joe O'Hara |
| Last Updated: | May 20, 2011 |
| 46868 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 519592016-05-25T19:15:00025 May 2016 19:15:00
[Table view]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)(B), Unanalyzed Condition Discovery of Non-Conforming Conditions During Tornado Hazards Analysis ENS 517712016-03-07T02:00:0007 March 2016 02:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Involving Diesel Driven Auxiliary Feedwater Pump Air Intakes ENS 513342015-08-20T22:10:00020 August 2015 22:10:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Condition That Could Prevent Pressurizer Porv Block Valves from Operating ENS 502822014-07-15T14:42:00015 July 2014 14:42:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition - Low Containment Spray Flow Rate ENS 502272014-06-25T20:55:00025 June 2014 20:55:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Potential Loss of Ultimate Heat Sink Capacity Due to Low Level ENS 501892014-06-11T19:34:00011 June 2014 19:34:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition One Containment Spray Train Chemical Additive Flow Out of Specifications ENS 493712013-09-09T22:00:0009 September 2013 22:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Leakage of Containment System Isolation Valve Controlled Leakage Devices ENS 468682011-05-20T23:00:00020 May 2011 23:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Marine Life Inside Afw Piping ENS 467072011-03-30T01:00:00030 March 2011 01:00:00 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 Potential Voiding in Auxiliary Feedwater Alternate Suction Line ENS 464152010-11-12T19:00:00012 November 2010 19:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Inaccurate Information Provided in License Amendment Request ENS 462032010-08-24T16:40:00024 August 2010 16:40:00 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)(B), Unanalyzed Condition Essential Service Water Placed in a Line-Up That May Have Prevented Its Safety Function ENS 460212010-06-17T10:19:00017 June 2010 10:19:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Containment Spray Recirc Sump Isolation Valve Failure to Stroke Closed 2016-05-25T19:15:00 | |
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