This document is the third in a series of progress report that records investigations of graphite bodies. Along with the report, two appendices are given to describe the different graphite bodies: "Synthetic Binders for Carbon and Graphite" and "High Temperature Physical Properties of Molded Graphites".

The angular relationships of warp to rib marks and warp to hot spots were measured for a large number of fuel elements. The data was analyzed and found to provide information regarding the formation of warp and hot spots.

A study was conducted to develop equations for calculating fission product heating in the RRT-CP undeflow pot from measured temperatures and to attempt to correlate the rate of solids accumulation in the undeflow pot with flssion heating and reactor power. Using fission heating data calculated from the heat balances developed, several semi-empirical equations relating solids accumulation and heating were tested. In one case an error of no greater thaQ 26% was incurred in the calculation of the total weight of solids collected during chemical plant runs 17-4, 17-5, and 17-6. Further development work will be done on this correlation. (auth)

Estimates indicate that first degree burns on the bare skin will be sustained 30 miles from a 10 megaton nuclear blast. Results are reported from a theoretical and experimental investigation of the temperature response of pig skin exposed to thermal radiation. While the study deals with radiant energy heating of skin, it is concluded that results may be applied to other modes of energy input. Methods were developed for the comparison of theoretical predictions with experimental results. An attempt is made to simplify the basic equation of heat conduction. Results are presented together with an evaluation of the constants of skin, whenever possible. It was shown that the absorption pattern of radiation in skin may be determined directly by temperature measurements. 50 references. (C.H.)

Enriched U-Zr power tubes with various component sleeves, seals, and plates were evaluated for testing in the General Electric Test Reactor. The evaluation data are tabulated. (J. R. D.)

The purpose of this study was to develop equations for calculating fision product heating in the HRT-CP underflow pot from measured temperatures and to attempt to correlate the rat of solids accumulation in the underflow pot with fission heating and reactor power. Using fission heating data calculated from relating solids accumulation and heating have been tested. In one case an error of no greater than 26% was incurred in the calculation of the total weight of solids collected during chemical plant runs 17-4, 17-5, and 17-6. Further development work will be done on this correlation.

Report containing reports from the Physics Division of the Oak Ridge National Laboratory that cover a wide variety of subjects.

Decontamination of stainless steel and carbon steel used in high temperature recirculation systems is currently being studied to obtain an effective and economical decontamination process for use in these systems. This report presents the preliminary investigation process which has demonstrated very effective decontamination and is low in cost.

A means for decontaminating the primary system of recirculating type reactor is necessary to insure operation and maintenance. This recirculation system can be contaminated by fuel element rupture products and induced corrosion product activities.