The conversion of plutonium nitrate to metal, the fabrication and assembly of plutonium devices and the recovery of scrap by Atlantic Richfield Hanford Company (ARHCO) has been studied previously in support of the Plowshare Program. Previous studies and Plowshare Task Force meetings along with a teletype directive form the bases for Study 4. The major changes and additions in Study 4 as compared to Study 3 are: a complete new building is considered as an alternate to the use of existing facilities, waste storage tankage is added to capital costs, operating costs are divided into labor, material and overheads, and are based on 1976 dollars, depreciation on capital costing is excluded from unit costs, and features of the existing ARHCO plant coupled with comments on actual operating experience and further explanation of the flowsheets are added to the appendix.

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Within the past few months two excellent summaries sup{(1,2)} of the state of our knowledge of the weak interactions have been presented. Correspondingly, we will not attempt a comprehensive review but instead concentrate this discussion on the status of CP violation; the question of the neutral currents, and the weak equivalence principle.