Characterization of the Fast-Neutron Irradiator and the Fast-Flux Tube Irradiation Fixtures at the Pennsylvania State Breazeale Reactor

Journal Article · 25 July 2023 · Nuclear Engineering and Design

DOI: https://doi.org/10.1016/j.nucengdes.2023.112505 · OSTI ID:2008202

Kuatbek, Maksat  ^[1]; Pierson, Bruce D. ^[2]; Lyons, Stephanie M. ^[2]; Flaska, Marek ^[1]; Johnsen, Amanda M.  ^[1]

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1. Pennsylvania State University, University Park, PA (United States)
2. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Accurate knowledge of the neutron spectrum at a nuclear research reactor is a prerequisite for planning irradiation experiments, as well as for evaluating irradiation exposure results. The neutron-flux spectrum in the fast-neutron irradiator (FNI) and the fast-flux tube (FFT) irradiation fixtures at the Pennsylvania State Breazeale Reactor (PSBR) were characterized using the multi-foil neutron activation method. These irradiation fixtures make use of graded shielding to produce unique neutron fields. Multiple foil sets were irradiated in the fixtures with different exposure times and reactor powers to understand the stability over a wide range of operating conditions. Measured results were evaluated against a MCNP6 simulation to produce a measurement-informed neutron flux-energy spectrum for each fixture using STAYSL_PNNL. Simulated estimates of the FNI fixture, a newer fixture (~25 years old), demonstrated excellent agreement with measured results; the FFT did not. Thermal neutron measurements from the FFT suggest there is additional thermal leakage not captured in the simulation model. In conclusion, possible explanations for the discrepancy include burn-out or degradation (i.e., micro-cracking, gaps, etc.) in the boral and cadmium liners over the lifetime of the fixture (~40 years old).

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE; Defense Threat Reduction Agency (DTRA)
• Grant/Contract Number: AC05-76RL01830
• OSTI ID: 2008202
• Report Number(s): PNNL-SA--188802
• Journal Information: Nuclear Engineering and Design, Journal Name: Nuclear Engineering and Design Vol. 413; ISSN 0029-5493
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English