Economic evaluation of tokamak power plants Page: 3 of 23
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magnetic field at the plasma edge, and the specified coil elongation
(ratio of vertical to horizontal bore). Thermonuclear power during the
burn (14.1-MeV neutrons plus 3.5-MeV alpha particles) is determined from
wall loading, plasma radius, major radius, and plasma elongation. Burn
time is scaled as a function of plasma volt-seconds, plasma resistance,
plasma current, and the flux swing capability of the ohmic heating (OH)
coil. The flux swing of the OH coil depends on the specified field in
the coil (set at 7 T for this study) and the bore of the OH winding,
which in turn depends on the major radius and TF coil radius. Cycle
average thermal power is computed from the burn time, the thermal power
during the burn (thermonuclear power plus exothermic reactions in the
blanket), and an assumed downtime of 1 min between cycles.
B. Component Cost Scaling
As previously indicated, current or near-term technology is emphasized.
Table I shows the major systems for a tokamak power plant and the
corresponding technology base used in this study. The component cost
TABLE I. TECHNOLOGY BASE FOR MAJOR
TOKAMAK POWER PLANT SYSTEMS
Pulsed Power Supplies
(NbTi and Nb3Sn)
Neutral Beam Injection
Austenitic Stainless Steel
Cryopumping and Extracting
Motor Generator Flywheel
Sets (^500 MVA and ^2 GJ)
Steam Cycle (T ^750°F
and n *^35%)
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Reid, R.L. & Steiner, D. Economic evaluation of tokamak power plants, article, January 1, 1977; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1063973/m1/3/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.