ENS Event | |
|---|---|
17:30 Nov 6, 2006 | |
| Title | One and Possibly Five Other Class "C" Fuel Assemblies Were Singled Out as Having the Potential of Having Flaws Above the Hairline Crack or Pinhole Leak Criteria. |
| Event Description | This event is a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> notification per Technical Specification 2.2.1.
Based upon the differences in the definition of damaged fuel presented in RSAP-0112, and the commitments made in various licensing documents, it was determined that a potential existed that damaged assemblies may have been placed in a fuel canister licensed only for intact assemblies. A potential problem exists with fuel assemblies, which had been categorized as class "C" assemblies in the RSAP-0112 inspection results, and therefore would not have had any restrictions on the type of canister to be placed. Class "C" assemblies were those assemblies not meeting the requirements of F2 for gross cladding defects, did not have cracks which exceeded dimensional of approx. 0.34 inches across and 0.7 inches high. Based on further review of the RSAP-0112 inspection results, six fuel assemblies were upgraded as potentially damaged fuel assemblies because the written inspection reports indicated the existence of a crack or missing cladding greater than the class "C" limit. With the exception of assembly 2G6, the video portion of the tape is not 100% conclusive that a crack greater than a hairline exists on the other five fuel assemblies. Based upon the images available of assembly 2G6, the crack on this assembly was scaled to be approx. 0.04 inches wide by 0.25 inches long. The film quality of the remaining 5 assemblies is not sufficient to provide such detailed scaling but is estimated for discussion purposes. NRC Project Manager (Randy Hall) was notified of this by the licensee. |
| Where | |
|---|---|
| Rancho Seco California (NRC Region 4) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+-0.17 h-0.00708 days <br />-0.00101 weeks <br />-2.32866e-4 months <br />) | |
| Opened: | Bob Jones 17:20 Nov 6, 2006 |
| NRC Officer: | John Mackinnon |
| Last Updated: | Nov 6, 2006 |
| 42968 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Decommissioned (0 %) |
| After | Decommissioned (0 %) |
Rancho Seco with Other Unspec Reqmnt | |
WEEKMONTHYEARENS 429682006-11-06T17:30:0006 November 2006 17:30:00
[Table view]Other Unspec Reqmnt One and Possibly Five Other Class "C" Fuel Assemblies Were Singled Out as Having the Potential of Having Flaws Above the Hairline Crack or Pinhole Leak Criteria. 2006-11-06T17:30:00 | |