ADVANTAGES AND DISADVANTAGES OF HIGH POWER DENSITY FUSION REACTORS - FIRST WALL THERMAL - MECHANICAL LIMITS
The advantages and disadvantages of compact, high power density fusion reactors are examined by coupling a thermal mechanical first wall mode to a simple economics model based on costings contained in recent comprehensive fusion reactor studies. The benefits of compact devices result from the reduced size, and hence cost, of the first wall, blanket, shield and coils. The disadvantages include the more frequent replacement of the first wall and blanket, leading to a reduced availability and increased operating costs, and a lower coolant temperature and higher pumping power, resulting in a reduced overall thermal efficiency. The analysis leads to a general relationship between the first wall loading and relative generating costs. Access to different ranges of wall loading is dependent on the thermal mechanical performance as the first wall operating conditions (material, temperature, etc.) govern the maximum heat loading allowed. Two materials are considered for the first wall, a copper alloy and stainless steel. The thermal - mechanical results show that the copper alloy allows higher surface heat fluxes than stainless steel, typically 3 - 5 MW/m**2 compared with 0.3 - 0.5 MW/m**2. When related to the economic results these higher fluxes imply a potential for higher wall loadings and lower overall costs for reactors employing a copper alloy first wall. However, the materials database for copper alloys requires considerable expansion before this promise can be realized.
Bibliographic Reference: WRITE TO HER MAJESTY'S STATIONERY OFFICE, P.O. BOX 276, LONDON SW8 5DT (UK), MENTIONING REPORT CLM-R 248, 1984 PRICE: #5.00
Record Number: 1989123060800 / Last updated on: 1987-01-01
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