ML18134A111

Enclosure 1: Rsi (Non-Proprietary) [Letter to J. Bondre Acceptance Review 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

ML18134A111
Person / Time
Site:	07201042
Issue date:	05/15/2018
From:	Jacobs C J Spent Fuel Licensing Branch
To:	Bondre J TN Americas LLC
Jacobs C J
Shared Package
ML18134A109	List: ML18134A110 ML18134A111
References
CAC 001208, EPID L-2018-LLA-0043
Download: ML18134A111 (8)

Text

Code of Federal Regulations

C. Canning Damaged Fuel Spent fuel that has been classified as damaged for storage must be placed in a can designed for damaged fuel, or in an acceptable alternative. The purpose of a can designed for damaged fuel is to (1) confine gross fuel particles, debris, or damaged assemblies to a known volume within the cask; (2) to demonstrate that compliance with the criticality, shielding, thermal, and structural requirements are met; and (3) permit normal handling and retrieval from the cask. The can designed for damaged fuel may need to contain neutron-absorbing materials, if results of the criticality safety analysis depend on the neutron absorber to meet the requirements of 10 CFR 72.124(a).

Note that the EOS-37PTH DSC will provide the retrievability function for damaged and failed FAs per ISG-2, Revision 2. However, if it is necessary to remove fuel from the DSC, intact and damaged fuel can be removed in a dry transfer facility or the initial fuel loading sequence can be reversed and the plant's spent fuel pool utilized.

Procedures for wet unloading of the DSC are presented here. Dry unloading procedures are essentially identical up to the removal of the DSC vent plug and drain port cover.

The basket structural material shall be a High-Strength Low-Alloy (HSLA) steel meeting one of the following requirements A, B, or C:

A. ASTM A829 Gr 4130 or AMS 6345 SAE 4130, quenched and tempered at not less than 1050 °F. This material is qualified as described in [10-31]. B. ASME SA-517 Gr A, B, E, F, J, or P. This material is qualified by the material properties at elevated temperature in ASME Section II, Part D, which exceed the values of yield and ultimate strength in UFSAR Table 8-10. C. Other HSLA steel, with the specified heat treatment, meeting these qualification criteria:

Damaged and failed fuel that meet the characteristics detailed in Table 2-2 and Table 2-4 are also acceptable for storage in the EOS-37PTH DSC in the appropriate compartments as shown in Figures 1F and 1H of the Technical Specifications [2-18].

The NUHOMS EOS-37PTH DSCs can also accommodate up to a maximum of four compartments with failed fuel, placed in cells located on the outer edge of the DSC as shown in Figures 1F and 1H of the Technical Specifications [2-18]. Failed fuel is defined in Section 2.1 of the Technical Specifications [2-18].

For damaged and failed assemblies, top and bottom caps are provided to contain any potential fuel debris, such as broken rods, loose pellets, and/or pieces of cladding in the fuel compartment. The end caps fit snugly into the top and bottom of the fuel compartment. They are held in place by the fuel compartments and the inner bottom cover plate and the top shield plug during transfer and storage. The end caps have multiple through holes to permit unrestricted flooding and draining of the fuel compartments.