Patent Number: 048204773
Section: claims

1. In a light-water cooled nuclear reactor, a method for preventing formation of tritium in a circulating light-water coolant medium for said nuclear reactor comprising diverting only a portion of said circulating light water coolant medium to means for removing deuterium to continuously remove deuterium from said portion of said circulating medium during normal operation of said reactor. 2. The method of claim 1 wherein said portion is substantially one percent of said circulating medium. 3. The method of claim 1 wherein said step of continuously removing deuterium comprises returning a remainder of said portion having a reduced deuterium content to said circulating medium. 4. The method of claim 3 wherein said step of removing comprises physically separating said portion from said circulating medium and directing said portion to a means for removing deuterium from said portion. 5. The method of claim 4 wherein said means for removing deuterium is a distillation column. 6. The method of claim 5 wherein the deuterium concentration of said remainder is less than about one part in 6,400. 7. The method of claim 5 wherein said step of separating comprises vaporizing light water from said portion and condensing said vaporized light water to produce said remainder. 8. In a light-water nuclear reactor, wherein predominantly light water is a circulating coolant medium in a coolant circuit, the improvement comprising means for directing only a portion of said circulating coolant from said coolant circuit to means for removing deuterium from said circulating coolant during normal operation of said reactor, and means for returning said portion to said circuit, whereby the formation of tritium is substantially prevented. 9. The reactor of claim 8 wherein said means for removing deuterium is a distillation column which separates heavy water in said portion from light water in said portion, and means for returing said separated light water to said circulating coolant. 10. The reactor of claim 9 wherein said portion is substantially one percent of said circulating coolant.