ML24002B143

Attachment (Redacted) - Email Dated 1/2/24 Dbussmann (Gns) to Ngarcia (Nrc), Staggered RAIs Castor geo69 Storage, Applicant'S Proprietary Review of Staggered RAIs Castor geo69 Storage Application-Shielding Evaluation (Public)

ML24002B143
Person / Time
Site:	07201052
Issue date:	01/02/2024
From:	Garcia-Santos N Storage and Transportation Licensing Branch
To:
Shared Package
ML23326A007	List: ML23326A011 ML23334A001 ML23356A004 ML24002B097 ML24002B098 ML24002B140 ML24002B141 ML24002B142 ML24002B143 ML24016A006 ML24016A008
References
CAC 01028
Download: ML24002B143 (1)

Text

OFFICIAL USE ONLY - PROPRIETARY INFORMATION RAI 6-1 Justify using 8,766 hours0.00887 days <br />0.213 hours <br />0.00127 weeks <br />2.91463e-4 months <br /> as the bounding exposure duration for an individual at the controlled area boundary for the dose rates analysis the CASTOR geo69.

In Section 5.1 of the safety analysis report, the applicant assumed annual doses at the storage site for an array consisting of [withheld per 10 CFR 2.390] storage casks as a function of distance, and 100 % occupancy for 8,766 hours0.00887 days <br />0.213 hours <br />0.00127 weeks <br />2.91463e-4 months <br />. However, there is no information that justify the use of 8,766 hours0.00887 days <br />0.213 hours <br />0.00127 weeks <br />2.91463e-4 months <br />. For normal conditions, a bounding exposure duration assumes that an individual is present at the controlled area boundary for 1 full year (8,760 hours0.0088 days <br />0.211 hours <br />0.00126 weeks <br />2.8918e-4 months <br />). The applicant needs to justify the using an alternative exposure duration for the staff making a safety and regulatory finding.

This information is needed to determine compliance with 10 CFR 72.236(b) and (d) for sufficient radiation shielding to meet 10 CFR 72.104.

OFFICIAL USE ONLY - PROPRIETARY INFORMATION