含铀氟化钙渣的产生控制及清洁解控条件研究

Produce Control and Clearance of Uranium Containing CaF_2 Sludge

含铀氟化钙渣是核燃料循环前段中的重要废物之一,通常要求其应能清洁解控。本文根据我国含铀氟化钙渣产生的主要特点,经过理论计算,推导出生产和废液处理工艺中控制含铀氟化钙渣放射性活度浓度的技术条件,如核燃料厂应控制进入固氟蒸氨工艺的废液处理量V和铀的质量浓度C1,满足VC1<723g的要求。本文还对含铀氟化钙中铀的监测提出了以监测沉淀工艺废液中的铀为主,氟化钙渣中铀的测量为辅的监测思路,对含铀氟化钙渣的回收再利用提出了统一规划、协调管理、标准化解控程序的建议。

Uranium containing CaF2 sludge is one of the important wastes in the nuclear fuel cycle,and generally it＇s required to be relieved from the nuclear regulatory control.According to the characteristics of uranium containing CaF2 sludge and theoretical calculation,the technical control conditions of radioactivity concentration of uranium containing CaF2 sludge in the production and waste water treatments were acquired.To ensure the clearance of uranium containing CaF2 sludge,the discharge quantity（V）of the main production process waste water and the mass concentration（C1）of uranium in waste water entering into the precipitation process should be controlled to make sure VC1〈723g in the nuclear fuel assembly manufacturing plant.Meanwhile,the monitoring emphasis should be put on the measurement of uranium in the precipitation process,with assistance of uranium measurement in the fluoride sludge.And for recycle and reuse of uranium containing CaF2 sludge,the clearance procedure and a long-term pro-gramme should be standardized.