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Tba report mi prepared a» u account of wot epoajond by u ifeacy of LSe Unitad Sum Gcnrament. Neither the United SUtM Gtiiwm, aot ny mnj thereof, nor lay of their emptor-. m "b*-f "Tarty, ciptoai ot aiphad, or lowam aay l»jil liability ot •aapcflsV Wity for the accuracy, mMplotiocei, ot OMMMM of say ufonwtke, apparela*. pndael, ot eece iterate to ajpapec^asamircialprcdKtprooe*^ lIV^^ 9f) muwfecUrer, or otbenrieo don act aeceawrily ooaatiMM at imply iu oadnewit. noon-^Jr mflrmtT. or ftrariai by &e Uaited Sum Gcrmanoat or uy aftec? thereof. The rim L

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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.