Taking inventories in reactor cores is critical for understanding their radioactive source terms and establishing the relationship between activity concentration primary loop status of core’s fuel. However, there a niche which simple but accurate conditions nuclide can reliably predict fission gas activities core loop. In this study, efficient model called “Inventories Point Reactor Fission Gas...

Nuclear fission has been used as a reliable source for utility power in the United States for decades. Even in the 1940’s, long before the United States had a viable space program, the theoretical benefits of nuclear power as applied to space travel were being explored [Humble, et. al.]. These benefits include long-life operation and high performance, particularly in the form of vehicle power d...

Almost all major nuclear operations produce residues containing radioactive materials; in reactor operations, for example, the fission products, new elements (such as plutonium) produced by neutron irradiation and the unfissioned nuclear fuel are all radioactive. Some of this material can be put to further use: useful radioisotopes, for instance, can be extracted from the fission products and p...

Introduction Safe operation of a nuclear reactor depends to a large extent on the behaviour of different fission products generated within the fuel. While most of the fission products settle down as dissolved state in the fuel matrix or as separate phases, the gaseous products, xenon(Xe), and krypton(Kr), and the volatile products, iodine(I), tellurium(Te), cesium(Cs), and rubidium(Rb), underg...

In a pressurized water reactor (PWR) nuclear power plants (NPPs) the pressure control in the primary loop is very important for keeping the reactor in a safety condition and improve the generation process efficiency. The main component responsible for this task is the pressurizer. The pressurizer pressure control system (PPCS) utilizes heaters and spray valves to maintain the pressure within an...

Significance: Sep 30, 2002 Identified By: NRC Item Type: FIN Finding UNEXPECTED CHANGES IN UNIT 2 OPERATING PARAMETERS AND DRYER FAILURE DUE TO FLOW INDUCED VIBRATION. The failure to consider the impact of new flow induced vibration failure mechanisms on the Unit 2 steam dryer as part of the extended power uprate analysis resulted in unexpected and unpredictable changes in reactor power, reacto...

The technical principles and practices of the civil nuclear industry are described with particular reference to fission and its products, natural and artificial radioactivity elements principally concerned and their relationships, main types of reactor, safety issues, the fuel cycle, waste management, issues related to weapon proliferation, environmental considerations and possible future devel...

Although there have been some severe nuclear accidents such as Three Mile Island (USA), Chernobyl (Ukraine) and Fukushima (Japan), nuclear fission energy is still a source of clean energy that can substitute fossil fuels in a centralized way and in a great amount with commercial availability and economic competitiveness. Since the pressurized water reactor (PWR) is the most widely used nuclear ...

Understanding and predicting nuclear fuel behavior is the cornerstone for design optimization, safe economic operation of reactors. Due to excellent neutronic economy operational characteristics lead/lead-bismuth-based liquid metal coolant, lead-cooled fast reactor (LFR) has received much attention been regarded as one top candidate reactors Generation IV power plants. Mixed oxide (MOX) benefic...

We have been studying -decay properties of nuclei far from the -stability line with the use of the 2nd generation of the gross theory and semi-gross theory. In the 2nd generation of the gross theory, the shell effects of nuclei are included only through the -decay Q-values. On the other hand, in the case of the semi-gross theory, other various shell effects of the parent nucleus are taken into ...