This report gives the status of production tests control tube loadings in reactor process tubes containing significant amounts of SS material. Data are given in table form. For further description of column headings and the current discharge goal exposure plan refer to Document DUN-3443.

The technical concept for Project Travois contains one simple analysis of the potential hazard of contaminating the Arrowrock Reservoir on the Boise River with some of the radionuclides produced. This previous analysis assumes homogeneous and prompt mixing of all the tritium and tungsten isotopes. This simple analysis is physically unrealistic sine there is no way of transporting all of these radionuclides to the reservoir, promptly. We shall in this paper reanalyze the contamination problem in such a way that we define the type of site geology and hydrology information that must be developed.

This report presents details of the activities of Douglas United Nuclear at the Hanford site during the month of June 1968.

On September 18, 1967, KE Reactor experienced,a failure in a K5E fuel element in tube 2863, exposure 634 Mwd/t. On September 24, 1967, two additional failures occurred. All of these elements, clad with X8001 alloy were from the same canning lot. All fuel elements from this canning lot were termed rupture-prone and were discharged. The elements from five columns including column 2863, but neither columns 2865 nor 3256, were sent to 105-C Basin Fuel Examination Facility for further examination. An incipient failure was found and sent to Radiometallurgy in an effort to determine the cause of failure. During the course of examination, the spire was found to contain beehive-shaped growths approximately 1/8-inch high and 1/8-inch 9 in diameter at the base. The incipient failure contained four of these growths protruding from the spire wall. Closer examination showed that the spire contained numerous other ``beehives`` in less advanced stages of growth. The ruptured element from 2863 also contained a ``beehive``. The second section of this report covers examination of several ``beehives`` and presents information concerning the possible cause or causes of growth.

The Building Electrical Power System, transmits, distributes and controls the electrical power utilized by the equipment of all of the FFTF system. Included are system functions and design requirements, the physical description of the system, safety considerations, principles of operations, and maintenance principles.

Drosophila melanogaster adults are irradiated and then mated to flies containing genetic markers and/or crossover suppressors in all chromosomes. Appropriate genetic schemes are followed to obtain balanced stocks of entire treated genomes. Each chromosome of each genome is observed for visibles, lethals, detrimentals and sterility factors. Tests are made for translocations involving any combination of chromosomes. All chromosomes of each genome are examined cytologically for possible deficiencies, inversions, transpositions, etc. and to determine the break points of the translocations. It is believed that a study such as this will give us a far better idea of the overall magnitude of radiation-induced genetic damage and a better insight into the nature of this damage, expecially the inter­-relationships between the different kinds of genetic alterations, than has heretofore been possible with studies of selected types of damage in selected chromosomes or loci.

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The purpose of a heat shield is to protect the payload from thermal damage during high speed atmospheric reentry.

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