NSUF 19-CINR-16583: Neutron Radiation Effect on Diffusion between Zr (and Zircaloy) and Cr for Accurate Lifetime Prediction of ATF

One of the very promising accident-tolerant fuel (ATF) claddings consists of Zircaloy coated with chromium (Cr). The diffusion coefficients – both impurity (dilute) diffusion coefficients and interdiffusion coefficients – between Zr (and Zircaloy) and Cr are essential for understanding the behavior of ATF under operating and accident conditions and for accurate ATF lifetime prediction. The objectives of this proposed project are: (1) to perform systematic diffusion studies of the Zr–(Cr, Nb, Ta, Mo) (and Zircaloy–Cr) as well as the Cr–(Nb, Ta, Mo) binary systems across the entire composition range and at multiple temperatures from 300 °C to 1200 °C to establish a reliable diffusion (mobility) database for the Zr–(Cr, Nb, Ta, Mo) and Cr–(Nb, Mo, Ta) binary systems; (2) to perform neutron radiation experiments at the temperature and neutron flux conditions close to the ATF operating conditions for extended durations at TREAT using the MARCH specimen holder such that the neutron-accelerated diffusion coefficients can be carefully evaluated; and (3) to subtract the regular diffusion contributions from the neutron-accelerated diffusion coefficients so that the neutron radiation effect on diffusion can be accurately evaluated. The systematic data from this proposed study will allow accurate prediction of the interdiffusion behavior of Cr, Mo and Ta and Zr (Zircaloy) and thus the lifetime of the Cr coated Zircaloy with Nb, Mo and Ta interlayered ATF.

Informație Adițională

Cîmp	Valoare
Awarded Institution	The Ohio State University
CINR Number	19-16583
Embargo End Date	2027-12-13
NSUF Call	FY 2019 CINR
PI	Ji-Cheng Zhao
Project Member	Dr. Yaqiao Wu, Research Professor - Boise State University
Project Member	Professor Ji-Cheng Zhao, Professor and Department Chair - University of Maryland (https://orcid.org/0000-0002-4426-1080)
Project Notes	Awarded on 06/27/2019
Project Type	CINR
RTE Number	3035