Nuclear Power 

Abstract: The safety problems of research reactors are discussed. Safety of these reactors depends principally from the rahin them, and the penetrating radiations emitted. The safety requirements for reactivity containments, control instruments and mechanisms, guaranteed supplies, and operations of the research reactors are described. The safety problems of high-flux reactors (10 to 20 Mwt) are discussed separately due to the complexity of the control systems. The problems involved in assessment of the safety document of new research reactors are also discussed. (N.W.R.)

Abstract: 803,701. Nuclear reactors. PARSONS & CO., Ltd., C. A. Oct. 18, 1956 [Aug. 11, 1955], No. 23225/55. Class 39(4). Ducts within the core 2 of a nuclear reactor contain a fluid with a neutron absorption that is varied to control the reactor. Where the fluid is an aqueous solution of a cadmium salt, this is supplied from a constant head mixing tank 5 to re-entrant tubes 1. Hot fluid leaving the core is cooled at 6 and stored in a reservoir 3. The neutron absorption is varied by variation of density, or level or pressure (gaseous fluids) in all or in selected tubes and thus the power output and/or the distribution of neutron flux may be controlled. Non-aqueuous liquids, including liquid metals, solid suspensions, and gases or mixtures of gases may be used.

Abstract: Nuclear power is a controversial form of power generation based on the exploitation of nuclear reactions. Nuclear power plants do not emit carbon dioxide while generating electricity but they do produce radioactive waste that must be disposed of safely. Safety is also a crucial factor because an accident at a nuclear power station can release radioactive material into the environment and this will potentially have devastating consequences. Nuclear power grew out of the nuclear weapons programs of the early and mid-20th century and the technology saw its greatest growth between the beginning of the 1960s and the beginning of the 1980s. In 2013 nuclear power contributed around 11% of global electricity.

Abstract: The problem of fuel element burnout in liquid cooled reactors is studied. The hydrodynamic and heat transfer processes involved in liquid heating are examined in the case in which a cold liquid enters a cylindrical heated tube and emerges as superheated vapor. In each of the heat transfer regions of this tube, processes whereby burnout could occur are analyzed. (T.F.H.)