Uranium enrichment adjusting method for HTGR and uranium enrichment adjusting apparatus for HTGR

摘要

PPROBLEM TO BE SOLVED: To provide a method and an apparatus for regulating an uranium enrichment of a fuel for a high-temperature gas-cooled reactor, which does not need waste fluid treatment and can shorten treatment time. PSOLUTION: At least two USB3/SBOSB8/SBpowder aggregates are selected from a plurality of USB3/SBOSB8/SBpowder aggregates having different uranium enrichments each other and each having 4.8 KgU or less in terms of uranium. Amounts proportionally distributed so that the total weighed amount becomes 4.8 KgU or less in terms of uranium and makes a desired uranium enrichment are weighed and collected respectively from the selected plurality of USB3/SBOSB8/SBpowder aggregates. After the difference between the total value X of weighed values of respective weighed USB3/SBOSB8/SBpowder aggregates and the weighed value Y of a united USB3/SBOSB8/SBpowder aggregate obtained by uniting respecrive weighed USB3/SBOSB8/SBpowder aggregates is checked to be within the range of a prescribed threshold value, uranyl nitrate is formed by dissolving the united USB3/SBOSB8/SBpowder aggregate in nitric acid. PCOPYRIGHT: (C)2010,JPO&INPIT