Analysis of HFIR Dosimetry Experiments Performed in Cycles 400 and 401

Remec, Igor¹  Baldwin, Charles A¹ 

[1] ORNL

关键词: BERYLLIUM;    DOSIMETRY;    FUEL CYCLE;    HELIUM;    HFIR REACTOR;    IRRADIATION;    MONITORS;    NEUTRONS;    ORNL;    PRESSURE VESSELS;    RADIATIONS;    REACTOR OPERATION;   

DOI  :  10.2172/937529
RP-ID  :  ORNL/TM-2008/046
PID  :  OSTI ID: 937529
Others  :  Other: KC0402020
Others  :  ERKCR01
Others  :  ORNL/TM-2006/108
Others  :  TRN: US0806097

美国|英语

来源: SciTech Connect

【 摘 要 】

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.