During April the N-Reactor operated with a time operated efficiency of 70.8%; and a production availability and steam availability to Washington Public Power Supply System of 68.5%. No fuel element failures occurred. A scheduled outage (April 18 to 25) was used to complete planned maintenance, accomplish the modifications required for the 4,800 Mw power level probe, and for charging the fourth increment of the coproduct demonstration load. Fuel element input production was 100% of forecast. Output production was 110% of forecast, significantly improving finished-fuel inventories and reducing in-process material levels. Calendar-year-to-date output is 102% of forecast. There are now 844 columns of coproduct fuel in the reactor. Two columns of high exposure, 1.96% enriched, coproduct fuel (discharged during March) were examined. These fuels had attained a tube average exposure of 4,094 Mwd/t and operated at uranium temperatures of 550 C to 475 C (temperature range predicted for Mark 5 fuel). Cladding buckling was minimal. The superior performance is attributed to the 800 ppm Al plus 400 ppm Fe uranium alloy. Flow testing of the prototypic Mark 4 fuel continued during the month. Flow split data are being used to redesign the support system to balance the flow in the coolant …

Work is reported in these areas: general radiation effects; toxicity of radioelements; studies at the molecular and cellular levels; environmental radiation studies; atmospheric radioactivity and fallout; marine sciences; radiological and health physics; and radiation instruments.

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Declassified 5 Sep 1973. A reactor configuration and operating conditions are selected for a 200 kW(e) Brayton cycle space power system as a reference point for the 710 Reactor fuel systems development program and for studies of the effects of the reactor and space power system designs on the 710 Reactor fuel system. (auth)

Declassified 21 Sep 1973. A wide range of metallic hydrides (to NH 9.0), each containing additives to tailor the nuclear characteristics, have been fabricated successfully. Specific additives have included B compounds and high Z- material compounds, e.g., W, Hf, Th. Hydrided Ti which contains B compounds has proven relatively easy to fabricate and has shown excellent radiation stability. Post-irradiation appearance (through 6 x 10/sup 20/ nvt thermal) shows no visible changes. Strengths to 150,000 psi at 380 deg C (with ductile failure) have been observed for TiH. Sound, massive N/sub H/ 6.9 hydrided Zr rods have been fabricated in hydride-furnace batches as large as 50 kg, with 100% yield. A 50 Th-50 Zr hydride of N/sub H/ 6.7 and higher has been fabricated. The basic structure, apparently ThZr/sub 2/H/sub 8/, is a cubic spinel-type structure and is the first reported hydride having this structure. This material, when containing a B compound additive, will probably provide more gamma shielding than is generally needed, but the material has interesting possibilities as a combination breeder-blanket-shield. It now appears that almost any combination of looked-for nuclear properties can be incorporated into a metallic hydride composite having useful engineering characteristics. (16 tables, 23 figs) (DLC)

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Work that has been carried out in several areas of High Energy Physics is described. Visual techniques are used. For the study of the three-pion decay of the K/sup +/ meson, bubble chamber and emulsion methods are used to complement each other, particularly for the tau' mode. Several separate bubble chamber experiments in ..pi../sup +/p, anti pp and K/sup -/p interactions are also described, and the large effort devoted to computer reprogramming for the data analysis indicated. Two emulsion research projects are also described which have for their purpose the study of electromagnetic processes induced by 16 BeV electrons and the study of hypernuclei by K/sup -/ mesons. For the latter work high speed computer methods have been successfully applied to the analysis of the product hypernuclei. These programs of work have not been under way long enough for the main results yet to be available, but some preliminary data have been published and several reports on data analysis and related subjects have been prepared.

This program on electron radiation damage in metals have included studies of the recovery spectrum of stage I for aluminium. Radiation doping was studied. (DLC)

This report gives the status of production test control tube loadings in reactor process tubes containing significant amounts of SS materials. These data are given in table form. For further description of column headings and the current discharge goal exposure plan refer to Document DUN-1048.

This report lists the bound periodicals in the Technical Library at the Pacific Northwest Laboratory, operated by Battelle Memorial Institute. It was prepared from a computer program and is arranged in two parts. Part one is an alphabetical list of journals by title; part two is an arrangement of the journals by subject. The list headings are self-explanatory, with the exception of the title code, which is necessary in the machine processing. The listing is complete through June, 1966 and updates an earlier publication issued in March, 1965.

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This report addresses the contributions by the Atomics International to the 24th High Temperature Fuels Committee Preliminary Information.

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