In more than 17 years of studying underground nuclear explosions, LLL has developed containment procedures that include a stemming plan. Stemming plans can be divided into either layered or continuous forms. There are marked differences between standards for these forms. The materials used in the continuous plan must meet more stringent specifications; as a consequence, they are more expensive. Both plans have been successful since the Baneberry Event. Both plans must meet the following requirements: provide a plug sufficient to match the overburden density of earth; contain radioactive gases at the lowest possible depth; minimize the generation of noncondensable gases (such as CO/sub 2/); minimize gas flow rates during the early post-detonation stages when cavity pressure is high; and be compatible with the experiment and its diagnostics. LLL experience in developing containment procedures is reviewed, and the reasons for the adoption of LLL's continuous stemming plan are reported. (LCL)

A stress analysis of the 3/8-inch and 1/4-inch pins which hold the rake assembly to the flange was performed and shows stresses to be lower than the Class 1 allowables of the ASME Boiler and Pressure Vessel Code. The alternating pin stresses were found to be below the endurance limit and fatigue failure will not occur. The rake assembly was assumed to be loaded by steady drag and lift forces and alternating vortex shedding forces.

This report outlines the history of the United Nations "Genocide Convention", and its recognition in the United States.

Continued fundamental studies are proposed on both the formation and properties of new materials for high-energy, gas-phase lasers. As originally proposed, attention will be focused mainly (but not wholly) on systems which have bound excited states but unbound ground states. An important class of such excimer/exciplex systems has a van der Waals dimer/oligomer as its ground state. In the original proposal for this work, a new method for the preparation of excimers and exciplexes was presented in which van der Waals complexes are formed as intermediates. Systems under study include the excited states of dimers, oxides and halides of inert gases.

This report discusses the U.N. convention on the prevention and punishment of genocide and arguments for and against its passage by the United States.