Evaluation of Radiolysis Data for Hydrogen Gas Generation During Gamma Irradiation of Pre-Corroded and Pristine Aluminum Samples - An Aluminum SNF Dry Storage Study Interim Report

Abstract

SRNL-STI-2020-00147 Revision 0 chemisorbed water. This rate would continue until the hydrogen from the chemisorbed water is exhausted or an equilibrium is established with back reactions. Additional radiolysis testing in calendar year 2020 (CY20) is being planned to allow better discrimination of physisorbed vs. chemisorbed contributions to H2 yield and the dose regimes over which they dominate. Data for thermally-conditioned ("dried") hydrated oxides will also be developed. The completion of the CY20 testing will lead to identification of the "steady-state" H2 generation rates that would be input to the ASNF-in-canister performance model to provide the best estimate of the evolution of gas composition over decades of dry storage.

Technology Development for Aluminum-clad Spent Nuclear Fuel for Extended Dry Storage (Status Report)

“…An evaluation of the radiolysis testing data collected to date including the notional phenomenological description of H 2 generation in a sealed canister system is contained in a separate topical report. [8] 3. As the first step toward developing three-dimensional (3D) multi-physics computational fluid dynamics (CFD) model for unsealed and vented canister storage system, a 3D CFD model coupled with bulk gas radiolysis reactions was developed first for sealed DSCs filled with inert gas and trace amount of air and water.…”