Pacific Gas and Electric Company; Diablo Canyon Independent Spent Fuel Storage Installation

Riepilogo

The U.S. Nuclear Regulatory Commission (NRC) is amending Materials License No. SNM-2511 for the Diablo Canyon (DC) independent spent fuel storage installation (ISFSI). Amendment No. 3 provides the following: (1) Changes the maximum allowable decay heat per storage location; (2) adds a new helium backfill pressure range for multipurpose canisters (MPCs) with heat loads less than or equal to 28.74kW, (3) clarifies that supplemental cooling was only applicable for unloading of high burnup fuel loaded in 2012 under the provisions of License Amendment No. 2, and (4) provides a maximum average yearly temperature of 65[emsp14][deg]F as the basis for a loaded overpack in the cask transfer facility, or storage on the ISFSI pad, and a maximum temperature of 100[emsp14][deg]F, averaged over a 3-day period, as the basis for transfer activities in the transfer cask to support revised thermal analyses.