![]() by comparison, in US style water is used as both moderator and coolant so when coolant goes, the reaction slows down. ![]() that would make enrichment far more difficult to detect and monitor making international verification of potential weapons production facilities much more difficult what was inherently risky about the Chernobyl style reactor? when a loss of coolant water occurs the graphite moderator stays in place maintaining the reaction rate. using this technology you can enrich using smaller, locally made facilities that use much less energy. these can then be drawn to a negatively charged surface. the laser is tuned to a frequency of light that excites only the U-235 isotopes. light(ordinary) water absorbs neutrons reducing, which would drop the reaction rate below critical if the U-235 were not concentrated what technologies are used commercially today to enrich uranium? diffusion and cenrtifuges what new enrichment technology is currently under development? how does it work and what are the associated security concerns? laser enrichment. that increase is needed to operate light water reactors and to make nuclear weapons why is enrichment needed for US style reactors? US style reactors use light water as the coolant and moderator. what is the purpose of enrichment? it increases the concentration of U-235. all together these reactors produce about 2000 metric tons per year of spent fuel (high level waste) or about 20 metric tons per plant per year. both of these types of reactors use fuel enriched to between 3% and 5% U-235. there are currently 45 BWRs operational in the US. ![]() boiling water reactors were a later design. there are 35 currently operational in the US. the original simple boiling water reactors. in a super-critical reaction, each fission causes more than one new fission, so the power output grows over time until the accessible fuel is used up what kind of nuclear power reactors are in common use in the US? what do they use for coolant and moderator? what kind of fuel is used in these reactors? about how much high level radioactive waste do these reactors produce per year? the US uses light water reactors. what does it mean to have a just-critical and a super-critical chain reaction? in a just-critical reaction, each fission causes exactly one new fission. when fission occurs, more neutrons are released, enabling the triggering of subsequent fissions. this process occurs in nuclear power reactors and in fission bombs what is a chain reaction? a chain reaction is a self-sustaining nuclear reaction in which each fission causes at least one more fission to occur. Fission a process in which a heavy element absorbs a neutron which make it unstable and causes it to break into two smaller fission fragments and additional neutrons.
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