Analysis of HFIR Dosimetry Experiments Performed in Cycles 400 and 401

Technical Report · Mon Sep 01 04:00:00 EDT 2008

DOI:https://doi.org/10.2172/937529· OSTI ID:937529

Remec, Igor ^[1]; Baldwin, Charles A ^[1]

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1. ORNL

The High Flux Isotope Reactor (HFIR) has been in operation at Oak Ridge National Laboratory since 1966. To upgrade and enhance capabilities for neutron science research at the reactor, a larger HB-2 beam tube was installed in April of 2002. To assess, experimentally, the impact of this larger beam tube on radiation damage rates [i.e., displacement-per-atom (dpa) rates] used in vessel life extension studies, dosimetry experiments were performed from April to August 2004 during fuel cycles 400 and 401. This report documents the analysis of the dosimetry experiments and the determination of best-estimate dpa rates. These dpa rates are obtained by performing a least-squares adjustment of calculated neutron and gamma-ray fluxes and the measured responses of radiometric monitors and beryllium helium accumulation fluence monitors. The best-estimate dpa rates provided here will be used to update HFIR pressure vessel life extension studies, which determine the pressure/temperature limits for reactor operation and the HFIR pressure vessel's remaining life. All irradiation parameters given in this report correspond to a reactor power of 85 MW.

• Research Organization: Oak Ridge National Laboratory (ORNL); High Flux Isotope Reactor
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 937529
• Report Number(s): ORNL/TM-2008/046; KC0402020; ERKCR01; ORNL/TM-2006/108
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
BERYLLIUM
DOSIMETRY
FUEL CYCLE
HELIUM
HFIR REACTOR
IRRADIATION
MONITORS
NEUTRONS
ORNL
PRESSURE VESSELS
RADIATIONS
REACTOR OPERATION