A helium-cooled blanket design of the low aspect ratio reactor Page: 4 of 25
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A HELIUM-COOLED BLANKET DESIGN
C.P.C. Wong, et al. OF THE LOW ASPECT RATIO REACTOR
An aggressive Low Aspect Ratio (LAR) scoping fusion reactor design  indicated
that a 1998 MW(e) reactor can have a major radius as small as 2.9 m resulting in a device
with competitive cost of electricity at 49 mill/kWh. This is an updated number about
3 mill/kWh lower than reported in Ref.  because of improvement in the calculation of
the reactor economics. One of the technology requirements for this high power density
reactor is a high performance first wall and blanket (FW/B) design to handle the peak
surface heat flux and neutron wall loading of 2.73, 11.1 MW/m2, respectively. A 15 MPa
helium-cooled, V-alloy and stagnant LiPb breeder (He-V-LiPb) FW/B design was
utilized. The coolant inlet and outlet temperatures were 250 C and 650*C, respectively.
Due to the low solubility of tritium in LiPb, there was the issue of high tritium partial
pressure in the first wall and blanket system with the possible formation of V-hydride.
This could lead to difficulties in controlling the migration of tritium and the possible
weakening of the structural material. In addition, in order to avoid the issue of high
ductile to brittle transition temperature of V-alloy under high neutron fluence, the
recommended minimum V-alloy operating temperature has been increased to 400*C .
Therefore, since the V-alloy structure will be in thermal contact with the helium coolant,
the helium inlet temperature of 250 C becomes an issue. To address these issues, a
helium-cooled, V-alloy, lithium breeder (He-V-Li) FW/B system developed for the
ARIES-DEMO design  was revisited to assess its capability of handling the high
power density design. High solubility of tritium in lithium metal will mitigate the issue
of tritium migration. To simplify the assessment, a simple bare tube with swirl tape heat
transfer enhancement is used to address the key issue of removing high first wall surface
heat flux with variation in. tube wall thickness and diameter. Additional design
GENERAL ATOMICS REPORT GA-A22828 1
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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/m1/4/?rotate=90: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.