A helium-cooled blanket design of the low aspect ratio reactor Page: 6 of 25
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A HELIUM-COOLED BLANKET DESIGN
C.P. C. Wong, et al. OF THE LOW ASPECT RATIO REACTOR
2. THE LOW ASPECT RATIO REACTOR DESIGN
A scoping design code was prepared and utilized to evaluate the critical issues of the
LAR design . The physics basis for A = 1.4, K = 3, 1-T of 62%, and bootstrap fraction
of 87% equilibrium design point was derived from earlier work . Using Krypton to
enhance the radiation from the core, it was shown to be possible to reduce the divertor
heat flux equal to that of the first wall. This feature comes with the corresponding
reduction in plasma reactivity. This scoping code is used in the He-V-Li FW/B design to
set the dimensions and geometry of the blanket module. For comparison, the design
parameters of the He-V-LiPb and He-V-Li FW/B designs are presented in Table 1. For
both designs, the goal is to have a plant Q (gross power/recirculating power) to be >4.
Schematic of the LAR design is shown in Fig. 1. As indicated, no divertor module would
be necessary if the approach of impurity core radiation to distribute the transport power
could be demonstrated by LAR experiments.
The key differences between the LiPb and Li breeder designs are as follows.
Neutronics results show that the change in blanket energy multiplication from the LiPb to
Li breeder design is from 1.4 to 1.2. In order to maintain the plant Q 4, the reactor size
has to be increased as shown in Table 1. Furthermore, to compensate for the low
volumetric tritium breeding capability of the Li blanket, the outboard total FW/B and
plenum thickness is increased from 1.0 m to 1.2 m. These changes also contribute to the
increase dimension of the TF-coil, and impact the economic of the reactor as presented in
Section 7. The other difference as shown in Table 1, is the use of higher concentration of
Kr as core radiation material and thus allowing the divertor heat flux to be closer to that
of the first wall heat flux.
GENERAL ATOMICS REPORT GA-A22828 3
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Wong, C.P.; Baxi, C.B.; Reis, E.E.; Cerbone, R. & Cheng, E.T. A helium-cooled blanket design of the low aspect ratio reactor, article, March 1, 1998; San Diego, California. (https://digital.library.unt.edu/ark:/67531/metadc705764/m1/6/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.