Year
2011
Abstract
We propose a new nondestructive assay system for 239 Pu and other actinides in spent nuclear fuel assembly in a water pool. Nuclear fuel materials are detected using nuclear resonance fluorescence (NRF) with laser Compton scattering (LCS) gamma-rays, which are generated by collision of high energy electrons and laser photons. This method can identify each isotope of interest hidden in heavy shields such as lead plates with a thickness of several centimeters. We have designed an extremely high-flux LCS gamma-ray source based on a new generation electron accelerator of the energy recovery linac and the fiver laser. The simulation calculation result shows that the case of the incident angle of 8 degree, the NRF event rate of the inside of the assembly is higher than that in the former case. This system measure 239 Pu of individual fuel rods and can detect a change from a spent fuel rod to a new fuel rod in an assembl