ENS Event | |
|---|---|
04:00 Jun 3, 2014 | |
| Title | Watts Bar Unit 2 Potentially Defective Fuses Installed |
| Event Description | WBN [Watts Bar Nuclear] Unit 2 (under construction) determined that Littelfuse Part Number FLAS005.T fuses manufactured under three date codes are potentially susceptible to nuisance opening according to Littelfuse letter dated April 30, 2014. Littelfuse Part Number FLAS005.T fuses are commercial grade and dedicated by TVA for use as a basic component in safety related systems. No confirmed examples have been identified that would have created a substantial safety hazard at this time. The potentially defective fuses were purchased for WBN Unit 2 and have been installed on WBN Unit 2 only. No potentially defective fuses have been installed on WBN Unit 1, SQN [Sequoyah] Units 1 or 2, or BFN [Browns Ferry Nuclear] Units 1, 2, or 3. At this time, there is no safety significance because fuel has not been loaded on WBN Unit 2. Installed and potentially defective Part Number FLAS005.T fuses will be replaced prior to obtaining a WBN Unit 2 Operating License. This issue has been documented in TVA's corrective action program as Problem Evaluation Report 878252 and is being conservatively reported by WBN Unit 2 under 10 CFR 50.55(e).
The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.55(e) | |
| Time - Person (Reporting Time:+10.25 h0.427 days <br />0.061 weeks <br />0.014 months <br />) | |
| Opened: | Jim O'Dell 14:15 Jun 3, 2014 |
| NRC Officer: | Charles Teal |
| Last Updated: | Jun 3, 2014 |
| 50166 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Under Construction (0 %) |
| After | Under Construction (0 %) |
WEEKMONTHYEARENS 501662014-06-03T04:00:0003 June 2014 04:00:00
[Table view]10 CFR 50.55(e) Watts Bar Unit 2 Potentially Defective Fuses Installed ENS 492092013-07-22T13:55:00022 July 2013 13:55:00 10 CFR 50.55(e) Potential Programmatic Breakdown of the Quality Assurance Program ENS 488712013-02-11T04:00:00011 February 2013 04:00:00 10 CFR 50.55(e) Instrumentation Lines Not Inspected Completely for Proper Slope ENS 486462013-01-03T14:00:0003 January 2013 14:00:00 10 CFR 50.55(e) Commercial Grade Dedication Program Degraded 2014-06-03T04:00:00 | |