ENS Event | |
|---|---|
20:47 Sep 12, 2014 | |
| Title | Stored Fuel May Not Meet Fuel Specifications or Loading Conditions for Hi-Storm 100 Cask System |
| Event Description | Arkansas Nuclear One (ANO) identified the potential for stored fuel that does not meet the fuel specifications or loading conditions of the Certificate of Compliance (CoC) for the HI-STORM 100 Cask System. Investigation into the cause of a Control Room Emergency Ventilation System (CREVS) actuation on the morning of 9/12/2014 led to sampling of helium circulating through the Multi-Purpose Canister (MPC-24-060) as part of the Forced Helium Dehydration process in the final stages of cask loading. Sample results indicated the presence of Kr-85. Kr-85 is a fission product that indicates the potential for the fuel that does meet the selection criteria for the HI-STORM 100 Cask System.
All fuel assemblies loaded into MPC-24-060 were checked to confirm their intact status (a cask Certificate of Conformance requirement) as part of the selection process. Each assembly's status as intact is based on in-mast sipping and/or ultrasonic testing performed subsequent to their final operating cycle. Results of these sipping and ultrasonic test campaigns are maintained in a comprehensive engineering report used to verify assembly status during cask fuel selection. Per the CoC for the Hi-STORM 100 Cask System, Appendix B, Section 1.0, the definition of 'INTACT FUEL ASSEMBLY' is a fuel assembly without known or suspected cladding defects greater than pinhole leaks or hairline cracks, and which can be handled by normal means. Given the presence of Kr-85 along with the fuels history, it cannot be confirmed that all fuel assemblies meet the definition of 'Intact' and would not meet the CoC Requirements for Fuel to be stored in the HI-STORM 100 SFSC System (Section 2.1.1). The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Arkansas Nuclear  Arkansas (NRC Region 4) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+-0.08 h-0.00333 days <br />-4.761905e-4 weeks <br />-1.09584e-4 months <br />) | |
| Opened: | Mark Reid 20:42 Sep 12, 2014 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Sep 12, 2014 |
| 50454 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 504542014-09-12T20:47:00012 September 2014 20:47:00
[Table view]Other Unspec Reqmnt Stored Fuel May Not Meet Fuel Specifications or Loading Conditions for Hi-Storm 100 Cask System ENS 412762004-12-20T21:30:00020 December 2004 21:30:00 Other Unspec Reqmnt Suspected Failed Fuel Assemblies 2014-09-12T20:47:00 | |