Abstract
Type 316H stainless steel samples were exposed to flowing FLiNaK salt for 1000 h in a monometallic thermal convection loop (TCL) with a maximum temperature of 650 °C and a minimum of 540 °C. Samples in the hottest part of the TCL lost mass, with a maximum mass loss of 1.4 mg/cm2, while samples in the coldest parts of the TCL gained mass, with a maximum mass gain of 1.0 mg/cm2. Analysis of the samples that gained mass showed an Fe-rich layer on the sample surfaces, indicating that Fe, not Cr, was the primary deposition product in the TCL. Cr loss was apparent to a depth of ∼5 µm in the hot leg. Post-exposure analysis of the salt showed major increases in the Cr, Fe, and Mn contents. The TCL was modeled using the TRANSFORM code. Modeled values matched the experimental temperature measurements showing that TRANSFORM is capable of accurately simulating the TCL conditions.
| Original language | English |
|---|---|
| Article number | 153551 |
| Journal | Journal of Nuclear Materials |
| Volume | 561 |
| DOIs | |
| State | Published - Apr 1 2022 |
Funding
The authors acknowledge the assistance of Jim Keiser, Tracie Lowe, and Victoria Cox at ORNL. This work was funded by the U.S. Department of Energy, Office of Nuclear Energy, Molten Salt Reactor Campaign.
| Funders | Funder number |
|---|---|
| Molten Salt Reactor Campaign | |
| U.S. Department of Energy | |
| Office of Nuclear Energy | |
| Oak Ridge National Laboratory |
Keywords
- Corrosion
- Fluoride Salt
- MSR
- Molten salt
- Molten salt reactor
- Stainless steel