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《Chinese Journal of Nuclear Science and Engineering》 2011-01
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An inherently-safe high-temperature nuclear energy producing process for the replacement of fossil and other depletive energy on a large scale

LU Ying-zhong (Oak Ridge National Laboratory,TN 37830,USA)  
To fully exploit the huge potential of nuclear energy for the replacement of fossil and other depletive energy as early as practical in 21st century,a novel process for producing high-temperature nuclear with full-power natural circulation operation is proposed,based on the innovative thermal-hydraulic designs of the primary circuit of a liquid-salt-cooled pebble bed reactor.In a deep-pool reactor featured with an ultra-simplified integral primary circuit,the high boiling-point primary coolant flows horizontally through an annular reactor core installed at the bottom of the pool,and is heated by the fission heat generated inside the spherical nuclear fuel elements.The heated coolant then flows upward in the central up-riser to the top of the pool,and then flows downward through a set of ultra-low resistance heat exchanger installed at the top of the pool and immerged under the surface of said primary coolant.The coolant is cooled therein by the secondary coolant,flows downward along the down-comer,and eventually returns to the reactor core.The flow of primary coolant is driven sorely by the natural circulation caused by the density difference of the primary coolants between the coolant riser and down-comer,no forced circulation pump is required.Since the excess reactivity of the reactor core is always kept low with continuous on-line refueling of the fuel balls,and the negative temperature coefficient is large,the core fission power could follow the external load fluctuation automatically throughout the entire operation cycles without using solid control rod systems.As a result,the layout of the integral primary circuit of such a reactor is extreme simple,and the inherently safety features are straightforward.The unit capacity of such a reactor has no theoretical limitation.It may extend from an MSR level up to a mammoth station as high as the largest hydro-station.The capital and generation costs would be lower than most other kind of power plants of comparative size.It could replace the fossil or other depletive energy on a large scale,and be supported with the future cheap,large-scale renewable energies to guarantee the sustainable developments of the world future.
【CateGory Index】: TL33
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