The objective of the production test is detailed in this report is to obtain information about the behavior of Zircaloy-2 jacketed rod-and-tube fuel elements during irradiation at high coolant temperatures specifically, this test should provide information about fuel element dimensional stability, suitability of the rod and tube support system, and behavior of the uranium--Zircaloy-2 bond. Four co-extended Zircaloy-2 jacketed rod-and-tube elements, two with welded tube end closure and two with integrally extruded tube end closures, will be irradiated to 2500 MWD/T at jacket surface temperatures up to 270{degree}C in the KER loops. One Zircaloy-2 jacketed seven-rod cluster UO{sub 2} element will also be irradiated.

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The composition of dissolver off-gas was determined for seven different dissolvings of uranium in nitric acid (both with one and two dissolvers in operation) at irregular intervals during February, March, and April, 1958. Samples were taken at the Purex 293-A facility absorber inlet, scrubber inlet, and scrubber discharge. The absorber was operated with and without reflux, and the scrubber was operated with water or with approximately 10% sodium hydroxide. This memorandum describes the sampling procedures and analytical methods and gives the gas analyses found.

This report details activities of the Nuclear Physics Research Operation for the month of August 1958.

Attached is a draft of revisions being made to subject document, HW-53612. These revisions pertain to the moderators only, and will be incorporated in an overall revision of the technical criteria, which will be issued soon. Requirements, criterion, and data are included.

The purpose of this report is to summarize briefly the work which has been done to date and to acquaint the reader with the results of the ``Hot Spot Investigation Program `` as well as some of the problems encountered.

A stable carbon arc operated in controlled atmosphere is described. The arc was designed to serve as a light source during lifetime studies of the B/sup 2/ SIGMA state of the CN molecule. The CN radiation from the plasma of the arc was investigated and found to have a brightness temperature of 5500 icient laborato K at lambda 3883 A. This is considerably higher than an estimate of the value required for lifetime measurements. The stability of the carbon arc under various conditions is discussed. For successful lifetime measurements, the light source employed must have a high brightness temperature (intensity). A method for the determination of the brightness temperature of a light source at a specific wave length is described. The method was used for determining the brightness temperatures of some available light sources. Sodium, thallium, and mercury discharge lamps, a medium-pressure mercury arc lamp, and the carbon arc were studied. (auth)

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