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Studies of the permeation and diffusion of tritium and hydrogen in TFTR

Description: This report documents the main features of studies conducted on the permeation and diffusion of tritium and hydrogen through the stainless steel sections comprising the vacuum vessel of TFTR. The overall conclusion of these studies is that tritium releases to the environment resulting from TFTR operations under normal conditions will be very small, less than one curie per year. A basis is described for predicting the magnitudes of the applicable transport properties for tritium-austenitic stainless steel systems as derived from a survey of the technical literature on tritium transport. The key characteristics of the TFTR vacuum vessel that are involved in the permeation and diffusion calculations are given. Information is given regarding the contemplated plasma scenarios and associated required gas injection quantities. Various issues involved in the bakeout of the vacuum vessel are discussed; focussing principally on the problems associated with in-situ bakeout and related means to reduce outgassing from the TFTR vessel and vacuum pumping system hardware. The anticipated tritium releases are studied considering the diffusion transients.
Date: October 1, 1975
Creator: Garber, H. J.
Partner: UNT Libraries Government Documents Department

Tritium systems preliminary design for TNS

Description: The salient features of a tentative configuration for a fuel handling system were evolved in connection with the joint Oak Ridge National Laboratory-Westinghouse The Next Step (TNS) Tokamak preconceptual design studies. The tritium-fuel system comprises seven main subsystems: tritium storage and supply, fuel fabrication and delivery, vacuum system spent fuel reprocessing, cryogenic distillation, detritiation of secondary containment sweep gas, surface cleanup processing, and reactor-cell-atmosphere cleanup. Additionally, the tritium system has close tie-ins with other systems such as neutral-beam deuterium injection; torus vacuum pumping, including a divertor if this is required for impurity control; radioactive waste treatments; ventilation of experimental areas; vacuum vessel and shielding coolants; and central instrumentation and control.
Date: January 1, 1977
Creator: Garber, H. J. & Watson, J. S.
Partner: UNT Libraries Government Documents Department

Trade Study Analysis for TNS Tokamaks.

Description: A series of parametric trade studies was performed to consistently evaluate the relative.costs and performance parameters of D-T burning tokamaks over a range of plasma sizes and toroidal field (TF) coil technologies. Four different types of TF coil technologies were investigated: water-cooled copper coils, superconducting NbTi and Nb{sub 3}Sn coils, and a "hybrid" coil arrangement consisting of a· normal conducting Cu coil nested within a superconducting NbTi coil. Results of the analysis indicate for TNS operation, for example, that for a given plasma beta at ignition, the Cu TF coil devices are least expensive, followed by the Nb{sub 3}Sn, NbTi, and NbTi/Cu options. Other conclusions and trends resulting from the study are presented and analyzed.
Date: September 30, 1977
Creator: Chapin, D. L.; Garber, H. J.; Sink, D. A. & Gibson, G.
Partner: UNT Libraries Government Documents Department

Westinghouse ICF Power Plant Study

Description: Abstract: In this study, two different electric power plants for the production of about 1000 MWe which were based on a CO/sub 2/ laser driver and on a heavy ion driver have been developed and analyzed. The purposes of this study were: (1) to examine in a self consistent way the technological and institutional problems that need to be confronted and solved in order to produce commercially competitive electricity in the 2020 time frame from an inertial fusion reactor, and (2) to compare, on a common basis, the consequences of using two different drivers to initiate the DT fuel pellet explosions. Analytic descriptions of size/performance/cost relationships for each of the subsystems comprising the power plant have been combined into an overall computer code which models the entire plant. This overall model has been used to conduct trade studies which examine the consequences of varying critical design values around the reference point.
Date: October 1980
Creator: Sucov, E. W.; Karbowski, J. S.; Prevenslik, T. V.; Green, L.; Lee, A. Y.; Gold, R. E. et al.
Partner: UNT Libraries Government Documents Department