This is a Report of a study that has been made Nak cooled reactor containing 199 ZrH-UO2 fuel elements to determine thermal-hydraulic characteristics of the core bundle, It contains nominal operating power of the reactor is 300kwt with the Nak existing from the core at 1200 F.

This report talks about Armco 22-13-5: development of standard practices for 17 1/2'' octagon.

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A process capability study was made to evaluate the capability of the Mettler DWA Automatic Filling Balance to dispense desired weights of material. Under ideal or relatively normal conditions the balance met the manufacturer's stated rating. For somewhat abnormal material, the rating was not quite met. An additional calculation is given to indicate expected improvement if abnormal material could be weighed under ideal conditions.

A number of approaches have been considered regarding the feasibility of separable high explosive systems for possible application in the Super Safe Program (Ambassador). After a very brief and limited investigation we have categorized various systems and given examples. The two basic approaches in the Ambassador program appear to be: Movement of fissionable material, and movement of explosives. Since explosives are our business, we will comment only on the latter approach. Movement of the explosive could entail small amounts of HE, such as for a detonator, booster, or a portion of the main charge.. These possibilities tend to beg the issue of true safety and dispersal. Movement of the entire main charge or of separate non HE components is certainly more desirable. Separable explosive systems are discussed.