This document contains the minutes for the September 13-14, 1990 meeting of the Tank Waste Science Panel. The objective of this document is to provide an accurate recapitulation of the proceedings so that the diverse views of the Science Panel members can be documented. The content of this document has been reviewed by each of the Panel members to assure its accuracy. Editorial comments are clearly marked in the text and are provided only for clarification. Because of this philosophy, this document may contain provocative statements, opinions which may run counter to facts, facts which are presented out of the context of the tank chemistry and physics, and information that may later be shown as incorrect. These meeting minutes, like the previous minutes and those which will follow, are intended to chronicle the Science Panel activities and progress toward the understanding chemical and physical mechanisms that are taking place in the waste tanks at Hanford.
Members of the Thnk Waste Science Panel met June 26-27, 1990, to discuss physical and chemical processes that could be responsible for episodic gas release events in tank 241-101-SY (commonly denoted tank 101-SY). Historical information regarding safety issues of tank 101-SY was presented along with existing technical information. Science Panel members agreed that the temperature profile just prior to a gas release suggests that either the high solids content or the density in the bottom layer of waste tends to trap gases generated in this layer until buoyancy forces cause the gas to begin moving. The crust is thought to provide only minimal resistance for the passage of the gas released from the bottom of the tank. Insufficient data were available to endorse any suggested mechanism for chemical evolution of H 2 in the tank. Science Panel members made numerous recommendations for monitoring the tank, sampling gases in the tank vent, taking core samples, and performing analyses. They also recommended performance of experiments to develop a fundamental understanding of the chemical processes involved and to determine the source of the H 2 and N 2 0 gases.
100 days o f c o o l i n g 54 Oxygen Demand o f F i s s i o n Product Compounds (B u l l a r d 1978). ....... .55 F i n a l Fuel Composition i n Atomic Percentage a t 10% Burnup and Cal c u l a t i on o f Oxygen Bal ance. Condensed f r o m
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