7 SHIELDING EVALUATION 7.1 Conduct of Review

The objective of the staff’s shielding review is to determine whether the shielding design features of the proposed Humboldt Bay ISFSI meet NRC criteria for protection against direct radiation from the material to be stored. Specifically, this evaluation establishes the validity of the dose rate estimates made in the Humboldt Bay ISFSI Safety Analysis Report (SAR) (Pacific Gas and Electric Company, 2004a). These estimates are used in the radiation protection review contained in Chapter 11 of this Safety Evaluation Report (SER) to determine compliance with regulatory limits for allowable dose rates and conformance with criteria for maintaining radiation exposures as low as is reasonably achievable (ALARA). The shielding evaluation includes a review of the information in Chapter 7, “Radiation Protection, ” and relevant section