The Elements of Nuclear Reactor Theory

Nature's neutron probe: Land surface hydrology at an elusive scale with cosmic rays

“…The sample area is large because neutrons travel tens to hundreds of meters in the atmosphere and instantly form a well-mixed reservoir of neutrons whose density is measured with a cosmic ray probe. The distance traveled in air is related to the large collision mean free path in air (∼32 m) and the low energy loss per atmospheric collision (∼7 collisions per log decrement of energy loss), both of which can be calculated from elementary nuclear properties [Glasstone and Edlund, 1952]. Furthermore, the tendency for neutrons to scatter diffusively contributes to the large footprint because diffusive radiation is governed by an inverse distance rather than an inverse square law [Glasstone and Edlund, 1952].…”

Design and Feasibility Study of a Pebble Bed Reactor--Steam Power Plant.

“…WASH 743 contains the statement "Although this standard charge is applicable to all the fuels considered herein, if a fuel type involves a significantly higher or lower portion of the capital m the plant or higher [3][4][5][6][7][8][9][10][11][12] or lower operating or waste disposal costs, the standard charge may be modified accordingly". We believe that this statement is appropriately applied to the graphite uranium fuel type described in this report.…”

“…Instead, we have attempted [4][5][6][7][8][9][10][11] to specify a system where valve requirements are at a minimum. During operation of the reactor, no valve action is required and during an emergency condition or during a maintenance period, the valves are not required to be leaktight across the seat.…”

“…Fuel burnup is equal to: APt(l -Go) = 6.38 Kg where: A = 0.48 Kg/MWYr P = 350 MW t_ = 100/365 = 0.274 year Go= 0.863 [3][4][5][6][7][8][9][10][11][12][13][14][15][16] This equation assumes that all Th-233 formed goes to U-233o…”

“…For exaxnple, all the kryptons decay through rubidium to strontium, both of which will probably settle out on various surfaces of the primary circuit. It is innprobable that any formi of chemical bond between the various fission product daughters and the primary equipment surfaces will exist and any particulate matter will be held by [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] weak Van der Waal forces. For this reason acid etching, which has been resorted to in those cases where the fission products are precipitated from a solution onto the equipment wall, should not be required in this system.…”