Abstract
ABSTRACT Nuclear decommissioning is crucial as nuclear facilities become old. This trend has recently accelerated, particularly following the accident at Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Holdings. New nuclear decommissioning technologies are required to improve safety, save time, and reduce costs. An example is γ-ray/X-ray (radiation photon) spectroscopy, which provides information on the types of radionuclides with radiation photon emissions. A feasibility study of radiation photon spectroscopy in conjunction with reactor dosimetry in a control rod guide tube positioned at the center of Fugen (a prototype advanced thermal reactor under decommissioning) was conducted. Fugen is a prototype advanced thermal reactor with 165 MWe electric power generation that is being decommissioned. The dose rates measured in a control rod guide tube positioned at the center of the reactor of FUGEN were 4.1–9.1 Gy/h. The dose rate considerably increased at a position close to a tank that contained 60Co caused by the radioactivation of stainless steel. Radiation photon spectroscopy was performed without radiation shielding, identifying 60Co with an energy resolution better than 5.4% at 1333 keV and 94Nb with an energy resolution better than 5.9% at 871 keV.
Published Version
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