ENS Event | |
|---|---|
21:45 Jun 4, 2015 | |
| Title | Not Meeting Technical Specifications Due to Omission in Previous License Amendment |
| Event Description | On June 4, 2015, plant personnel notified the Diablo Canyon shift manager that three casks loaded during the current ISFSI campaign were not in verbatim compliance with Technical Specification (TS) 2.3. These three casks utilized regionalized loading. TS 2.3 (Alternate MPC-32 Fuel Selection Criteria) specifies fuel assembly selection criteria based using information from corresponding Tables 2.1-7 (uniform loading) or 2.1-9 (regionalized loading). However, the associated formula in TS 2.3 refers only to using the values in Table 2.1-7 (uniform loading).
Engineering has performed an evaluation and determined there is no impact on the fuel stored in the three casks. Table 2.1-9 is described as being acceptable in Technical Specification 2.3, although omitted from the formula in TS 2.3. It appears that the inconsistency in TS 2.3 was due to an error of omission in the previous License Amendment Request, which did not appropriately add the reference to Table 2.1-9 to the formula presented in TS 2.3 as originally intended. This concern did not result in any adverse affect on the health and safety of the public. The NRC Resident Inspector has been informed.
The fuel assembly loading of the three casks discussed in the original event notification has been re-evaluated. This evaluation was performed to determine that compliance to ISFSI Technical Specification 2.3.b was maintained using the uniform loading values of Table 2.1-7. The calculation revision demonstrates that the fuel placed in region 1 and 2 of the regionalized casks loads complied with the ISFSI Technical Specification requirements as written. Therefore, the requirements of TS 2.3 were met for the subject casks and this event notification is being retracted. The NRC Resident Inspector, R4DO(O'Keefe), and NMSS Events (via email) have been notified. |
| Where | |
|---|---|
| Pacific Gas & Electric Co. Avila Beach, California (NRC Region 4) | |
| License number: | SNM-2511 |
| Organization: | Diablo Canyon |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+0.45 h0.0188 days <br />0.00268 weeks <br />6.1641e-4 months <br />) | |
| Opened: | Jeremy Cobbs 22:12 Jun 4, 2015 |
| NRC Officer: | Dong Park |
| Last Updated: | Jun 30, 2015 |
| 51126 - NRC Website
Loading map... | |
Pacific Gas & Electric with Other Unspec Reqmnt | |
WEEKMONTHYEARENS 511342015-06-07T01:03:0007 June 2015 01:03:00
[Table view]Other Unspec Reqmnt Not Meeting Technical Specifications Due to Incorrect Loading of Casks ENS 511262015-06-04T21:45:0004 June 2015 21:45:00 Other Unspec Reqmnt Not Meeting Technical Specifications Due to Omission in Previous License Amendment 2015-06-07T01:03:00 | |