In view of contamination difficulties within the Redox operation, number of items are being considered to improve this situation. It is the objective of this document to list and describe seven times which it is felt would contribute most toward improvement. It is also an objective to present for RDS-D-12 Group consideration the recommendations of representatives from Manufacturing, Technical, and Design in these matters with the expectation that a project proposal written in general terms for overall contamination improvement would be prepared.

Declassified 24 Sep 1973. A tentative flowsheet is presented for the recovery of uranium from prototype Rover fuel by leaching with boiling 15.8 M HNO/ sub 3/. The effects of uranium content of the fuel, nitric acid concentration, and particle size on the efficiency of leaching were partially determined. For fuel containing more than 100 mg U per cc 15 wt%), 99.3% of the uranium was leached in 6 hr with 8 M HNO/sub 3/ when the fuel was ground to -16 mesh. However, only 98.6% of the uranium was leached from fuel -containing 35 mg U per cc (1.8 wt%) in 6 hr with 15.8 M HNO/sub 3/ when the fuel was ground to -16 mesh. The use of 8 M HNO/sub 3/ on fuel of the latter composition resulted in even lower uranium recoveries. (auth)

Tests have been run in the HRT core system mockup which demonstrate that iodine can be successfully removed from dry steam by a silver bed. Such a bed is recommended to prevent iodine poisoning of the HRT recombiner catalyst. An added advantage will be removal of I/sup 135/ from circulation, whereby reducing neutron losses a Xe/sup 135/, a daughter. Four experiments were made with the silvered Alundum pellets during which experimental mass transfer coefficients were determined. At 110 deg C the experimental kg was 25% of the theoretical value, and at 150 deg C the kg was 52% of the theoretical. The experimental efficiencies were 68% and 97.8% of the theoretical efficiencies at the above temperatures. Increasing the gas temperature greatly improved the correlation of the theoretical and experimental data. Two iodine removal tests were made using silver-plated stainless steel wire mesh. These two tests gave higher removal efficiencies than the corresponding tests with the silvered Alundum rings. The metal support is preferred also because of its greater mechandical andd chemical stability. In particular, leaching of Ns/sub 2/O from Alundum rings was noted in the HRT. In a test of the stability of the silver-plated wire mesh, only 0.0025% of …

The effect of seal configuration on the rate of mixing flow between the impeller cavity and the motor cavity of a Westinghouse Model 400 A pump was extended to include a configuration wherein the lower radinl bearing acts as a secondary seal. This arrangement increases the life of the motor windings; however, the life of the lower radial and thrust bearings is shortened because of inadequate cooling. (J.E.D.)

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While the concept of a biological system as a balanced network of chemical transformations is not a new one, experimental definition of specific systems has been lacking. This paper defines theoretically and experimentally a number of such networks and their behavior and response to some limited environmental changes.