Most HWRs currently use natural uranium fuel. Using enriched uranium fuel results in a significant improvement in fuel cycle costs and uranium utilization. On the other hand, reactivity changes of HWRs over the full range of operating conditions from cold shutdown to full power are small. This reduces the required reactivity worth of control devices and minimizes local flux distribution perturb...

The Department of Energy (DOE) has given the Spallation Neutron Source (SNS) project approval to begin Title I design of the proposed facility to be built at Oak Ridge National Laboratory (ORNL) and construction is scheduled to commence in EyOl . The SNS initially will consist of an accelerator system capable of delivering an -0.5 microsecond pulse of 1 GeV protons, at a 60 Hz frequency, with 1...

A methodology to assist the design of liquid metal reactors, passively cooled by natural circulation during off-normal conditions, is derived from first principle physics. Based on this methodology, a preliminary small LFR accomplished and presented with accompanying neutronic reactor dynamic characterizations. The benefit using for compared other available methods discussed.

Abstract The paper presents a transient simulation phase of the new benchmark on large sodium fast reactor (SFR). This is devoted to modeling selected operational transients performed during startup tests French SFR Superphénix. Six were for analysis. specifications simplified thermal hydraulic model equipped with point kinetics reactivity data and boundary conditions are given in paper. develo...

The present article summarizes the development and testing of a reactivity modulation device developed by French Atomic Alternative Energies Commission (CEA). It was installed in CROCUS reactor Swiss Federal Institute Technology Lausanne (EPFL). Experimental tests were performed framework collaboration between CEA EPFL. so-called PISTIL aims at measuring nuclear transfer function frequency rang...

Radioisotope 99 Mo is one of the most essential radioisotopes in nuclear medicine. Its production an Aqueous Homogeneous Reactor (AHR) could be potentially advantageous compared to traditional technology, based on target irradiation a heterogeneous reactor. An AHR conceptual design using low-enriched uranium for has been studied depth. So far, possibility replacing with non-uranium fuel, specif...