Physics of E-N load compared to natural uranium load at H reactor.

摘要

The proposed tritium-plutonium producing load (E-N load) at H Reactor will be made up of striped columns of (open quotes)black(close quotes), lithium-aluminum (boll or N) slugs and enriched (.947 w/o U(sup 235)) uranium slugs in the flat zone. The fringe zone will have a blanket, boll load supported by E columns. The boll slug and enriched slug are of the I&E geometry. The enriched slug is an OIIEB which is a bumper slug. The boll slug has an effective length of 4.2 inches and is 3.1 w/o lithium which is enriched to 38.5 atomic percentage of Li(sup 8). The use of a (open quotes)black(close quotes), boll slug is more desirable than a (open quotes)grey(close quotes) boll slug from a conversion ratio point of view. Past experience and calculations can be used for loading the blanket, boll columns and supporting enrichment. Calculations are necessary for determining the length ratio of E to N in the striped loading that will allow sufficient reactivity for efficient reactor operation, and for determining the reactivity transients of the E-N load. The results of these calculations are presented in this document.