Showing 86 results for Author: Jianwei Hu
Aug, 2026
Journal
Ultra-high energy resolution microcalorimeter gamma-ray spectroscopy—with energy resolution 5 to 10 times better than observed in spectra obtained by commercial-off-the-shelf high purity germanium detectors—is an enabling technology for ultra-precise isotope identification and quantification. Microcalorimeter gamma spectroscopy complements measurements requiring high-accur…
Jul, 2026
Journal
Nuclear material control and accounting (MC&A) of pebble-bed reactors (PBRs) is challenging because a PBR utilizes hundreds of thousands of identical, unmarked pebbles that are continuously recirculated through the core. To develop tools that enable the implementation of international safeguards, especially in the context of MC&A of spent pebbles, we designed and simulated…
Mar, 2026
Conference Paper
Mar, 2026
Conference Paper
Feb, 2026
ORNL Report
Oct, 2025
ORNL Report
Given the unique characteristics of the PBR fuel cycle, both gamma and neutron measurements are expected to play important roles in performing and maintaining nuclear material control and accounting for spent pebbles to safeguard the fuel cycle. Given the lack of irradiated pebbles in the US, a variety of irradiated TRISO fuel samples with wide ranges of burnups and coolin…
Aug, 2025
ORNL Report
Nuclear material control and accounting (MC&A) for pebble bed reactors (PBRs) has remained as a challenge for both domestic and international safeguards because of the unique fuel cycle characteristics of a PBR compared to those of a conventional light water reactor including the large number of fuel elements (i.e., pebbles) used in the core and the online refueling. As pa…
Aug, 2025
ORNL Report
FY-24 annual report