preliminary design of an ultra-high temperature reactor
TRANSCRIPT
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Preliminary Design of an Ultra-high Temperature Reactor
Using MHD Power Conversion for Mars Exploration
An Weijian, Song Jian, Xie Jiachun, Hu Gu, Zhao Shouzhi,
Sun Zheng, Wu Yuanyuan
Presented by Xie Jiachun
China Institute of Atomic Energy
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4. Conclusion
3. Reactor Design
2. Fuel Consideration
1. Introduction
Contents
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Introduction
Item Chemical rocket NTP NEP
Thrust Very high High Low
Isp Low High Very high
Human Mars exploration:
Initial mass
Trip time
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Introduction
Thermoelectric Thermionic
Stirling Brayton
Succeeded
or
Promising
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Introduction
Schemetic view of MHD reactor system by Ron J. Litchford and Nobuhiro Harada
MHD: a far term technology, >40%, very attractive
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Introduction
Parameters values
Thrust , N 100
Isp, s 5000
Operating time, yr 1.5
Table 1
Parameters Values
Thermal power, MW 25
Coolant Helium
Inlet temperature, K 800
Outlet temperature, K 2200
Table 2
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Fuel Consideration: Challenges
Ultrahigh temperature
> 2000 K
PWR
SFR
HTGR
……
NTP
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Fuel Consideration: Current technology
(U,Zr)C graphite based fuel Cermet fuel
Rover/NERVA GE 710, ANL, and now NCPS
> 2500 K > 2500 K
No more than hundreds of minutes Believed to be much more robust
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Reactor Design: Fuel Description
Fuel derived from GE 710 and ANL program
Parameters Values
Active Fuel length(cm) 60.96
Fuel Composition W-60vol%UO2-
6vol%Gd2O3
Coolant Channel number 91
Across Flats(cm) 2.361
Channel Diameter(mm) 0.914
Clad Composition W-25wt%Re
Channel Clad Thickness(mm) 0.204
Outer Clad Thickness(mm) 0.415
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Reactor Design: Core Description
Parameters Values
Active Core Height(cm) 60.96
Effective Core Radius(cm) 21.0
Core Height(cm) 71.2
Core Radius(cm) 31.5
Safety Rod Channel Radius(cm) 1.05
Fuel Element Number 246
Filler Element Number 66
Drum Number 16
235U Mass(kg) 254.0
Reactor Mass(kg) 1617.0
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Calculation Results: Power Distribution
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Calculation Results: Temperature Distribution
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Calculation Results: Depletion
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Calculation Results: Critical Safety
Submerged in Water
Keff = 0.9652
Submerged in Wet Sand
Keff = 0.9664
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Conclusion
Reactor scheme meets the
requirements very well Cermet holds the key
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Thank you for your attention