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This report is about the Analysis of hypothetical core disruptive accident (HCDA), where the analysis is done by using available GE and ANL codes to determine the characteristics and mechanical consequences of such accidents.

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From nuclear science symposium; Miami Beach, Florida, USA (6 Dec 1972). A computer-controlled fuel handling machine used to refuel a nuclear power generating station is described. The refueling process and the basic concepts of the electronic system controlling the process are explained. A comparison is made between manual control and automatic control, using data from actual operation. (auth)

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The {sup 55}Fe from nuclear weapons testing which enters the ocean is in a chemical form which is much more readily available for biological uptake than is stable oceanic iron. This property of {sup 55}Fe results in up to 1000-fold higher {sup 55}Fe specific activities in marine organisms than is present in seawater. Dilution of {sup 55}Fe by stable iron from anthropogenic sources or natural sources appears to be responsible for the lower specific activity in mid-latitude marine organisms than in organisms from high latitudes. The half-time for {sup 55}Fe in harvested salmon from the west coast is essentially the same as the half-residence time for stratospheric radioactive debris. This fact suggests that {sup 55}Fe reaching the ocean surface is available for biological uptake for a relatively short time. Measurements of {sup 55}Fe specific activities in certain crustacea predacious fish than in the phytoplankton. What we have learned about the behavior of the radionuclide {sup 55}Fe in the ocean environment may well apply to other fallout radionuclides, and a consideration of this fact should be included in estimating the potential hazard of the release of radionuclides to the marine environment. These data suggest that the release of radioiron from a …

A venturi type bubble generator was developed for application in the xenon removal system proposed for a molten-salt breeder reactor. Gas injected into the high velocity liquid at the venturi throat is fromed into bubbles by the fluid turbulence in the diffuser cone. Tests were conducted using aqueous solutions to determine the various pressure drops of the bubble generator as a function of liquid and gas flow rates and to determine the bubble diameter produced. Empirical relationships were developed which could be used in combination with the more conventional fluid flow equations to predict the overall head loss and the gas injection pressure of the bubble generator. A dimensionless correlation for predicting the bubble diameter was developed for bubble generators of similar geometry.

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Plutonium is a man-made element whose behavior in the marine environment is inadequately known at present. It has been studied intensively in connection with production of weapons and power sources and has been characterized as an extremely toxic substance. Nevertheless, only a few dozen measurements have been made of concentrations in seawater and in the associated organisms and sediments. The first of these were as recent as 1964. There are reasons to believe its chemical behavior in the ocean is different from what has been observed on land, and that it will be difficult to predict how plutonium will distribute itself in the ocean. The consequences of increased environmental concentrations of Pu are discussed. (auth)