A p r o c e s s was developed t o reduce t h e n i t r i c a c i d concentrat i o n of i o n exchange f e e d s o l u t i o n s t o < 1 M by metering i n formic a c i d t o r e a c t with t h e n i t r i c a c i d and form gases and water.

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A proposed method for long-term containment of radioactive wastes produced at the Savannah River Plant is storage in vaults excavated in crystalline rock 1500 ft beneath the surface of the plant. Radiolysis of the waste to form gases will occur during storage of the waste. This report summarizes tests with synthetic wastes to develop design data on the radiolytic gas evolution rates. These tests showed that a vapor volume of ~IS% of the total sealed volume would be sufficient to keep the pressure in the storage vault below the surrounding 1500-ft hydrostatic pressure. These tests also provide part of the basic data necessary to predict the behavior of the gases and the liquid waste over the ~IOOO years of storage necessary for the decay of 90 Sr and J37Cs to innocuous levels.-2 - CONTENTS

The concept for decontamination and retirement of radioactive liquid waste tanks at the Savannah River Plant (SRP) involves hydraulic slurrying to remove most of the settled sludges followed by chemical dissolving of residual sludges. Dissolving tests were carried out with small samples of sludge from SRP Tank l6H. Over 95% of the sludge was dissolved by 8 wt % oxalic acid at 85°C with agitation in a two-step dissolving process (50 hours per step) and an initial reagent-to-sludge volume of 20. Oxalic acid does not attack the waste tank material of construction, appears to be compatible with the existing waste farm processes and equipment after neutralization, and with future processes planned for fixation of the waste into a high-integrity solid for packaging and shipping.