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.
- * * RETRACTION AT 1728 EDT ON 06/30/15 FROM DARRELL JOHNSON TO STEVE VITTO * * *
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.