[en] Personal reflections of Mr. Michael Wilson on the IAEA Board of Governors activities in the area of safeguards in 1991-1993 are described

[en] The Olympic Dam mine is scheduled to become fully operational midway through 1988. Ore reserves are estimated at 450 million tonnes, and the annual mining program calls for the processing of 1.5 million tonnes of ore which will produce 2,000 tonnes of uranium, 50,000 tonnes of copper and 90,000 oz of gold

[en] Stressing the importance of the Non-Proliferation treaty and the IAEA Safeguards, the author expresses a wish for a better flow of information to the IAEA from Member States, concerning design information on nuclear facilities and nuclear trade, and a more active role by the Secretariat in carrying out its responsibilities

[en] To define the problem areas for both the rf and induction linac scenarios. We are not addressing engineering or cost considerations. We also did not consider the test beds

[en] Hartree-Fock and pseudo-relativistic Hartree-Fock calculations have been made for the 6s,5d and 6p configurations of BaII and used to provide estimates of screening effects and specific mass isotope shifts for the 6p-5d transition. (Auth.)

[en] The national high level nuclear waste management program has reached a crisis. The DOE is ready to proceed with underground testing, but they are prevented from doing so. Meanwhile, the ratepayers' money continues to be spent. Some of the road blocks facing the program seem insurmountable. It is time to evaluate the current program and determine whether it is workable. If the program is not workable, an alternative approach must be taken. This paper identifies the problems currently facing the high level waste management program and provides options for restructuring the program

[en] The standard high pressure liquid chromatography (HPLC) method for determining radiochemical purity (RCP) of [¹³¹I]m-iodobenzylguanidine ([¹³¹I]m IBG) is cumbersome and time-consuming. A simplified and rapid separation method with the use of a reverse-phase extraction chromatography technique (i.e. Sep-Pak[reg] C18 [SPC] cartridge) is described. The new SPC system closely correlates (r = 0.99) to the standard HPLC method, and the time to complete the SPC analysis is less than 5 min

[en] Seepage into the repository drifts is an important factor in total-system performance. Uncertainty and spatial variability are considered in the seepage calculations. The base-case results show 13.6% of the waste packages (WPs) have seepage. For 5th percentile uncertainty, 4.5% of the WPs have seepage and the seepage flow decreased by a factor of 2. For 95th percentile uncertainty, 21.5% of the WPs have seepage and the seepage flow increased by a factor of 2. Ignoring spatial variability resulted in seepage on 100% of the WPs, with a factor of 3 increase in the seepage flow

[en] Yucca Mountain, Nevada, is being considered as a potential site for a repository for spent nuclear fuel and high-level radioactive waste. Total-system performance-assessment (TSPA) calculations are performed to evaluate the safety of the site. Such calculations require submodels for all important engineered and natural components of the disposal system. There are five submodels related to the unsaturated zone: climate, infiltration, mountain-scale flow of water, seepage into emplacement drifts, and radionuclide transport. For each of these areas, models have been developed and implemented for use in TSPA. The climate model is very simple (a set of climate states have been deduced from paleoclimate data, and the times when climate changes occur in the future have been estimated), but the other four models make use of complex process models involving time-consuming computer runs. An important goal is to evaluate the impact of uncertainties (e.g., incomplete knowledge of the site) on the estimates of potential repository performance, so particular attention is given to the key uncertainties for each area. Uncertainties in climate, infiltration, and mountain-scale flow are represented in TSPA simulations by means of discrete high, medium, and low cases. Uncertainties in seepage and radionuclide transport are represented by means of continuous probability distributions for several key parameters

[en] In high energy Si^q+ collisions with solid targets, one observes the hypersatellite x-rays. The analysis of such data requires the theoretical fluorescence yields. These results are also important in the investigations of low energy highly charged silicon ions scattered from surfaces. Calculations have been performed with the Hartree-Fock model for states with electron configurations 1s^o 2s^a 2p^b for all allowed values of a and b. The x-ray energies, line fluorescence yields and life times are presented