Following stimulation by three nuclear explosives, the field rate of production of ''Reservoir A'', U.S.S.R., increased very significantly. The potential profitability of projects such as Reservoir A and some of the possible causes for the increased rate of production are reviewed.

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Mixed (uranium-plutonium) oxide standards were prepared and utilized to qualify available nondestructive assay equipment (gamma spectrometers, neutron counters, and calorimeters). Equipment was evaluated during normal operation in a plutonium facility. Measured material balances were calculated for two separate fabrication campaigns. Plutonium material unaccounted for values of less than 0.5% based on the total throughput was obtained in the final balance. A special test was undertaken to compare the plutonium content of single pellets determined by available nondestructive assay methods with controlled potential coulometric values. The implications of both programs on safeguards are summarized. (auth)

The beryllium reflector control system development for SNAP reactors is documented, from the initial SNAP 10A System through the current 5-kW(e) Thermoelectric System. Described are the various reflector concepts used in these systems for shadowshielded and 4 pi -shielded nuclear systems. The development of the key components, such as the actuators, bearings, and drive mechanisms for these systems, is also traced from the SNAP 10A concept through to the current system. Developmental test results are outlined, showing the performance capability improvements made throughout the life of the SNAP programs. Component development was highly successful, as proven by a number of reactor systems tests, including the launch and operation of the SNAP 10A flight. 46 references. (auth)

The method of defining detection limits which has been adopted by the 222-S Analytical Laboratory counting room is described. The system for reporting limits defines two levels of detection limits: the critical level (L/sub c/) which must be exceeded before a sample can be said to contain any material above the background level and a detection limit (L/sub D/) at which we can be 95% sure that we will detect material. The common method of using twice the standard deviation of the background as a lower detection limit was found to lead to erroneous results. Equations relating L/sub c/ and L/sub D/ to the magnitude and standard deviation of the background were derived. Two examples illustrate the use of these levels. (auth)

Data are summarized on the radioactivity in environmental samples collected from various locations within the Hanford plant boundaries during 1970. Data are included on the content of /sup 90/Sr, /sup 32/P, /sup 46/Sc, /sup 51/ Cr, /sup 65/Zn, /sup 131/I, /sup 2 4/Na and tritium in samples of water from the Columbia River; the total BETA activity in samples of drinking water; the total alpha and BETA activity in samples of surface waters; the radioactivity in tissue samples from waterfowl, game birds, deer, and small mammals feeding on the area; the total BETA activity and /sup 131/I content in samples of surface air; and the total alpha , BETA , and gamma activity in samples of air filters from various locations. (CH)

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We propose to study diffractive phenomena caused by 100 BeV pions, using a new technique, which consists in associating with the high energy interaction, the detection of photons resulting from the de-excitation of nuclear levels. Knowledge of the quantum numbers both for the ground state and the nuclear levels of the nuclei used, adds information as to the type of interaction. In particular, the use of the 4.4 MeV level of Carbon guarantees that the exchange quantum has isotopic spin 0. In addition, evidence resulting from our tests at Berkeley seems to further encourage the notion that this level selects to a good extent phenomena of the diffractive type. We ask for 150 hours of running on a 100 BeV/c pion beam.

One of the unique features of NAL that cannot be duplicated elsewhere (i.e. at CERN-ISR) is the ability to make high energy neutrino beams and high energy meson beams, It appears that meson-proton interactions may have given us some insight into hadron structure because the asymmetry (2 quarks on 3) which one observes in them cannot be seen in proton-proton (3 quarks on 3) interactions. Although the asymmetry can be observed in {pi} p collisions, it is likely that more can be learned if the role played by a single quark or parton can be identified, In K{sup +}p interactions this becomes a possibility because one quark in the K{sup +} meson carries a strangeness quantum number which has potential for identification after the interaction by means of the K{sup o} decay signature.