ML18213A038

Enclosursi (Letter to P. Narayanan Acceptance Review (Continued) of Tn Americas LLC Application for Certificate of Compliance No. 1042, Amendment No. 1 to Nuhoms Eos System (Docket No. 72-1042, CAC No. 001028, EPID: L-2018-LLA-0043)

ML18213A038
Person / Time
Site:	07201042
Issue date:	08/01/2018
From:	Christian Jacobs Spent Fuel Licensing Branch
To:	Narayanan P TN Americas LLC
Jacobs C
Shared Package
ML18213A036	List: ML18213A037 ML18213A038
References
CAC 001208, EPID L-2018-LLA-0043
Download: ML18213A038 (2)

Text

Request for Supplemental Information (non-proprietary)

By letter dated February 15, 2018, as supplemented on June 14, 2018, TN Americas LLC submitted to the U.S. Nuclear Regulatory Commission (NRC) an application for Certificate of Compliance No. 1042, Amendment No. 1 to the NUHOMS EOS System, pursuant to the requirements of Part 72 of Title 10 of the Code of Federal Regulations (10 CFR 72).

This request for supplemental information (RSI) identifies additional information needed by the NRC staff in connection with its review of this amendment application. Each RSI below describes information needed by the staff to complete its acceptance review determination of the subject application.

Criticality/Shielding RSI

1. The staff issued an RSI requesting specification of the new contents, which includes failed fuel and damaged fuel, and information on how the failed fuel is confined in the fuel cell.

In response to the staffs RSI, the applicant referred to the definition of intact fuel in Tables 2-3 and 2-4 from the Safety Analysis Report, Revision 0. The staff notes that the information in these referenced tables is inconsistent with the definition of failed fuel in the applicants proposed Technical Specifications included with the submittal. Therefore, the staff cannot determine the characteristics of the new contents necessary to perform a criticality and shielding review of the cask design. Specifically, the allowable quantity of the contents per fuel cell and the physical form and the dimensions (i.e., rod segments, loose pellets) is needed. In order to determine the geometry and source distributions for the contents, the staff needs to understand how the content is confined in the fuel cell and the potential for fuel relocation/reconfiguration under normal and off-normal operations and accident conditions.

The staff needs this information to proceed with its review to determine if the NUHOMS EOS system with the requested new contents meets the regulatory requirements of 10 CFR 72.124(a), 72.124(b), 10 CFR 72.236(c), and 10 CFR 72.236(d).

Materials RSI

1. With respect to the use of the damaged/failed fuel basket end caps and rod storage baskets (or similar components) for the storage of failed fuel, provide the following information:

a. Clarify if the rod storage basket (or a similar component) performs any safety functions, such as confinement of gross fuel particles, debris, or damaged assemblies to a known volume within the dry shielded canister. Clarify how these components are relied on in the criticality, shielding, thermal, and structural evaluations, and in loading and retrievability operations.

b. Provide design bases information and drawings for the rod storage basket (or a similar component) if these components perform or support safety functions.

Enclosure

c. Provide an explanation of how the system meets the regulatory requirements of 10 CFR 72.236(h) and (m), and how the system is designed to allow the users to meet the regulatory requirements of 10 CFR 72.122(h)(1) if the rod storage basket (or a similar component) is categorized as not important to safety.

d. Clarify whether failed fuel would always be placed in a rod storage basket (or a similar component).

This information is necessary to determine compliance with 10 CFR 72.236(b), (h) and (m).