舶用原子炉燃料束の熱水力動特性のサブチャネル解析
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概要
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This report describes steady state and transient thermal-hydraulic analysis of the rod bundle nuclear elements of a marine reactor. The conservation laws have been applied to the channel and the fuel rods by finite difference techniques. In the analysis, the cross-section of the bundle has been divided into subsections as each of them has one subchannel and a part of its adjoining fuel rods. The aim of the analysis is to modify the steady state thermal-hydraulic subchannel analysis of COBRA-I computer code to be able to apply it to the transient analysis of the rod bundles of a marine reactor undergoing the following disturbances: 1. sinusoidal rolling and heaving motion. 2. sinusoidal change of coolant flow rate at the bundle inlet. 3. system pressure change. From the analysis, the following prediction has been derieved: 1. In the case 1, under the sinusoidal rolling motion at period of 5sec and inclination of 30 deg., the deviation of the subchannel enthalpy from its steady state value to its steady state increment in its subchannel (normalized deviation of subchannel enthalpy) and the deviation of the subchannel flow rate from its steady state value to its steady state value (normalized deviation of subchannel flow rate) at the bundle outlet are less than 0.4% and 1.0% respectively, and under the heaving motion at period of 5 sec and maximum gravity acceleration of 2g, the former is negligibly small and the latter is less than 0.3%. 2. In the case 2, under the sinusoidal change of flow rate at the bundle inlet at period of 5sec and amplitude of 10% to the steady state value, each of the normalized maximum deviations of the subchannel enthalpy and the subchannel flow rate at the bundle outlet almost equals to that of the coolant at the outlet of a uniformly heated single channel which has the same volume of the coolant as that in the bundle. 3. In case of 10% depressurization from 110kg/cm^2 in 0.1sec, it occurs flow burst at 0.1sec, when the normalized deviation of the subchannel flow rate comes to even 100%, but that of the subchannel enthalpy only to minus 10%.
- 独立行政法人 海上技術安全研究所の論文
- 1974-06-30
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