ENS 45122
ENS Event | |
|---|---|
14:20 Jun 10, 2009 | |
| Title | Unanalyzed Condition - Unknown Cable with Combustible Coating Found in Division I / Division II Cable Tray |
| Event Description | At 0920 on June 10, 2009, technicians [performing] a Halon detection functional surveillance found a No. 10 AWG Tefzel coated conductor that ran in the Division 1, Division 2, and non-divisional cable trough in the Main Control Room subfloor panels. The conductor is terminated at a ring lug to a bus bar on one end, and the termination point on the other end is unknown. The Tefzel coating is combustible.
This is reportable as an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> report in accordance with 10 CFR 50.72(b)(3)(ii)(B) as 'any condition that results in the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety.' Clinton is required to have divisional separation in the event of a fire, and if the cable caught fire both Division 1 and Division 2 could be impacted. The station is working on determining the design function of the conductor and what the conductor is connected to. The licensee will notify the on-site state IEMA Resident Inspector. The licensee will notify the NRC Resident Inspector.
The licensee is retracting this event based on the following: Further inspection of the duct run in the subfloor section reveals that the #10 AWG Tefzel coated conductor is actually 2 separate conductors, not just one. Each is a ground for the flex conduits in the divisional ducts (as described in USAR section 8.3.1.4.5.5), installed to ensure that hot shorts in the wiring inside the flex conduit will melt the upstream fuses. In addition, between the division 1 and division 2 duct sections, there is a metal barrier in the duct, providing the separation barrier between redundant Class 1E equipment (Division 1 and Division 2 cables) as described in IEEE 384. Also, further review shows that Tefzel is flame retardant and non-propagating, passes the IEEE 383 and UL vertical tray flame test, and is rated 'non-burning' under ASTM D635. There is no divisional separation issue and no condition that results in the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety. The licensee has notified the on-site state IEMA Resident Inspector and NRC Resident Inspector. R3DO (Lipa) notified. |
| Where | |
|---|---|
Clinton  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+3.67 h0.153 days <br />0.0218 weeks <br />0.00503 months <br />) | |
| Opened: | Michael A. Reandeau 18:00 Jun 10, 2009 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Jun 15, 2009 |
| 45122 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (98 %) |
| After | Power Operation (96 %) |
WEEKMONTHYEARENS 531102017-12-09T19:48:0009 December 2017 19:48:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 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, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Manual Reactor Scram Due to Loss of Division 1 Ac Power to Numerous Components ENS 526012017-03-09T09:19:0009 March 2017 09:19:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Relay Failure ENS 523772016-11-17T23:00:00017 November 2016 23:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Incorrect Method Used for Calculation of Control Room Habitability ENS 516692016-01-20T19:11:00020 January 2016 19:11:00 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 Primary-Secondary Containment Pressure Differential Exceeded Due to Ccp Exhaust Fan Trip ENS 493732013-09-20T14:17:00020 September 2013 14:17:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Safe Shutdown Analysis Reveals Noncompliance for a Fire Outside Diesel Room ENS 475102011-12-08T11:00:0008 December 2011 11:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition - Non Fused Dc Bus Ammeters Could Short and Cause a Fire ENS 466032011-02-08T14:00:0008 February 2011 14:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Event Could Initiate High Pressure Core Spray and Overfill the Reactor Pressure Vessel ENS 451222009-06-10T14:20:00010 June 2009 14:20:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition - Unknown Cable with Combustible Coating Found in Division I / Division II Cable Tray 2017-03-09T09:19:00 | |