ML23113A012

Encl 1 - Request for Additional Information CR3MP

ML23113A012
Person / Time
Site:	07109393
Issue date:	05/02/2023
From:	Storage and Transportation Licensing Branch
To:	Orano Federal Services
Shared Package
ML23113A010	List: ML23113A012
References
EPID L-2021-NEW-0003
Download: ML23113A012 (1)

Text

Non-Proprietary Request for Additional Information for the Model No. CR3MP Package Docket No. 71-9393 By letter dated September 1, 2021 (Agencywide Documents Access and Management System

[ADAMS] Accession No. ML21244A485), Orano Federal Services LLC submitted an application for approval of the Crystal River 3 Middle Package (CR3MP).

On February 14, 2022, staff accepted the application for review after receiving on January 6, 2022 (ADAMS No. ML22006A365), responses to the October 15, 2021, request for supplemental information (ADAMS No. ML21286A798).

On December 19, 2022, staff received responses (ADAMS No. ML22356A314) to the first request for additional information (RAI) dated June 24, 2022 (ADAMS No, ML22172A114).

This second RAI identifies information needed by the staff in connection with its detailed review of the CR3MP. The U.S. Nuclear Regulatory Commission staff used NUREG-2216, Standard Review Plan for Transportation Packages for Spent Fuel and Radioactive Material: Final Report, in its review of the application. Each question describes information needed by the staff for it to complete its review of the application and to determine whether the applicant has demonstrated compliance with regulatory requirements.

CHAPTER 4 CONTAINMENT EVALUATION Demonstrate that the Normal Conditions of Transport (NCT) and Hypothetical Accident Conditions (HAC) package pressures consider the effects of all the gases within the package air gap.

SAR section 3.5.2 presented a revised calculation for determining pressure at NCT and HAC, in which the package pressure was dependent on gases within the LDCC, which is a solid structure with internal pores. However, the calculation did not explicitly address the air within the 3-inch gap between the top of the LDCC and the bottom of the package lid.

Typically, the pressure within a container considers the ideal gas law and its input parameters and their effects, including volume of the air gap, gases within the air gap (e.g., moles), and gas temperature of the air gap. For the CR3MP package, both the gas temperature and quantity of gases would increase once the package is closed for transport.

For example, the gas temperature would increase from approximately ambient temperature (e.g., 5°C) at closure to the eventual steady-state NCT value, and the quantity of gases within the air gap would increase after closure due to the presence of radiolysis gases. In addition, water vapor pressure from concrete-associated water would impact pressure (e.g., total pressure is the summation of each gas components partial pressure). The package pressure would increase during the fire hypothetical accident condition due to, for example, the increase in water vapor pressure and the gas temperature within the air gap and LDCC.

This information is needed to determine compliance with Title 10 of the Code of Federal Regulations, Section 71.43 and 71.51.

Enclosure 1