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A new conceptual blanket design for a fusion reactor produces fissile material for fission power plants. Fission is suppressed by using beryllium, rather than uranium, to multiply neutrons and also by minimizing the fissile inventory. The molten-salt breeding media (LiF+BeF2+ThF4) is circulated through the blanket and on to the online processing system where 2 "u and tritium are continuously removed. Helium cools the blanket including the steel pipes containing the molten salt. Austenitic steel was chosen because of its ease of fabrication, adequate radiation-damage lifetime, and low corrosion rate by molten salt. We estimate the breeder, having 3000 MW of fusion power, produces 6400 kg of " 3 U per year, which is enough to provide make up for 20 GWe of LWR per year (or 14 LWR plants of 4440 MWt) or twice that many HTGRs or CANDUs. Safety is enhanced because the afterheat is low and the blanket materials do not react with air or water. The fusion breeder based on a pre-MARS tandem minor is estimated to cost $4.9B or 2.35 times an LWR of the same power. The estimated present value cost of the " 3 U produced is $40/g if utility financed or tl6/g i f government f inanced. the tokamak. The particular tandem mirror design is based on a pre-MARS design 5. The plant parameters are given in Table I. The technologies used are listed in Table II.

This report establishes standard unit costs and scaling rules for estimating costs of material, equipment, land, and labor components used in magnetic confinement fusion reactor plant construction and operation. Use of the standard unit costs and scaling rules will add uniformity to cost estimates, and thus allow valid comparison of the economic characteristics of various reactor concepts .

Fusion Technology I n s t i t u t e , University of Wisconsin-Madison 1500 J o h n s o n Drive, Madison, Wisconsin 53706-1687Sunil Ghose, Bechtel G r o u p , Inc., S a n Francisco, C A R o b e r t B o u r q u e , G e n e r a l Atomics, S a n Diego, C A a n d o t h e r m e m b e r s of t h e W.J. Schafer Associates T e a m Abstract SOMBRERO is a conceptual design study of a lo00 MWe KrF laser driven IFE power reactor utilizing direct drive targets with near symmetric illumination. The chamber is constructed of a low activation carbon/carbon composite and the blanket consists of a moving bed of solid Liz0 particles flowing through the chamber by gravity. The particles are transported through the intermediate heat exchanger and around the loop in a fluidized state by He gas at 0.2 MPa. There are. 60 laser beams in near symmetric distribution, the laser energy is 3.4 MJ, the target gain is 118 and the rep-rate is 6.7 Hz. The chamber has a cylindrical central region with conical ends, has a minimum radius of 6.5 m and a blanker/reflector thickness of 1 m at the midplane giving a tritium breeding ratio of 1.25 and an overall energy multiplication of 1.08. The first wall is protected from x-rays and ions by 0.5 torr of Xe gas. A grazing incidence metallic mirror is located at 30 m from the target and the final focusing dielectric coated mirror which is shielded from direct neutrons is located at 50 m.Source neutrons are directed into neutron traps making it possible for the final focusing mirrors to be lifetime components. The inlet temperature of the Liz0 particles is 550°C. the equilibrated outlet temperature 74OOC and the power cycle efficiency is 47%. Using a laser efficiency of 7%. the driver power is 325 MWe. The gross power output is 1360 MWe, giving a net power output of loo0 MWe. with 360 MWe used for the driver and auxiliary equipment.

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