None

None

None

None

None

In order to evaluate the performance of uranium slugs canned by the hot press method, several tubes of this metal were charged at C Pile and scheduled for irradiation until a specified number of ruptures had occurred. At the present time, all scheduled ruptures of hot-pressed slugs have been obtained. This report summarizes the irradiation experience under this test and the results obtained to the present time, and presents conclusions which are drawn from this experience.

None

None

None

A study was made to determine the feasibility of designing a gas let- down system for homogeneous reactors, in which the pressure is taken through a fairly long tube rather than across a throttling valve. A schematic design of such a system is shown for the HRT in which the letdown stream passes through parallel tubes. Control is effected by the cutting in or out of tubes as is needed. Calculations indicate such a design is feasible. It is recommended that experimental work be done before the adoption of this design. The experimental work should be designed to demonstrate the ease of control, determine the stability of the two phase flow in the system, determine the operating characteristics throughout the pressure, and temperature range expected, and determine the effect of an orifice on flow stability. (auth)

None

None

This document provides tables which give the computed acid, silicate, and silica requirements which will be necessary after completion of the water treatment plant expansion programs.

None

None

The overall process of photosynthesis involves a number of interconnected processes. These processes, which are cyclic with respect to both energy and material, are related at some points to well-known respiratory processes. The carbon-reduction cycle in photosynthesis is now known in detail. All enzymes involved in this cycle have been isolated and the sources of energy required for its operation have been identified in terms of reducing agents and 'high-energy' phosphate. These sources of energy a r e derived ultimately from absorbed light energy which brings about the photolysis of water. Possible mechanisms for this photolysis and for the transfer of energy from the photolysis products to the carbon-reduction cycle are discussed here. Experimental data, in the form of quantum efficiency measurements, are presented and partially confirm the theories proposed for the mechanisms of energy transfer. A diagram of the complete process of photosynthesis containing the several cycles and their relations is presented.

1. The r a t e s of photosynthesis and subsequent respiration of Chlorella pyrenoidosa were measured using an oxygen analyzer (sensitive to paramagnetism). The energy absorbed during the photosynthesis periods was determined and the quantum requirement was calculated. 2. Dark respiration r a t e was found to depend on the r a t e of light absorption during the period of photosynthesis, and increased with increasing photosynthesis rate. 3 . The quantum requirement, corrected for respiration, varied from 4. 9 ( a t a ratio of photosynthesis to respiration of 1.4) to 6. 9 (at a r a t i o of 12). Both uncorrected and corrected quantum requirements approach an experimental value of 7. 4 a t high light intensity. 4. The lower quantum requirement obtained a t low light intensity is believed to be due to a relatively greater importance of contribution of energy from respiration t o photosynthesis. An expression i s derived for the relation between this contribution and the enhancement of dark respiration due to the level of photosynthesis to which the plants a r e conditioned. 5. Attempts to obtain the blue -light stimulation of photosynthesis with algae photosynthesizing in r e …

None

Report on methods for making spherical uranium particles.

This review indicates the present limiting capacities within the Redox plant and presents courses of action necessary to realize an instantaneous rate of 12/TD. The changes contemplated to reach this goal are time cycle reductions, procedural changes, and equipment changes which can be undertaken and achieved by the Redox organization presumably without recourse to project funds or special authorizations. The review proceeds systematically from the dissolvers, through head and, the extraction columns, concentrators, tail end equipment, and auxiliary equipment.

None

None

None

None