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N,N-二甲基羟胺(DMHA)是用于动力堆乏燃料后处理U与Pu和Np分离的新型无盐还原剂,本文研究了硝酸对DMHAγ-辐解及液态辐解产物的影响.研究结果表明:在U、Pu分离循环和Pu纯化循环的辐照剂量下,在0.3-1.0 mol·L-1的硝酸溶液中,0.1和0.5 mol·L-1DMHA具有较好的辐照稳定性.当吸收剂量为5-25k Gy时,DMHA硝酸溶液的液态辐解产物主要有单甲基羟胺、甲醛、甲酸和亚硝酸.有机物的浓度远远高于亚硝酸浓度,且随着剂量和硝酸浓度的增加而增大.对于相同的硝酸浓度和剂量,0.1 mol·L-1DMHA辐解产生的一甲基羟胺的浓度高于0.5 mol·L-1DMHA,但前者辐解产生的甲醛浓度低于后者;当硝酸浓度较高时,0.1 mol·L-1DMHA辐解产生的甲酸浓度高于0.5 mol·L-1DMHA.亚硝酸浓度与硝酸浓度及剂量的关系取决于起始DMHA和硝酸浓度.
N, N-Dimethylhydroxylamine (DMHA) is a new type of salt-free reductant for the separation of U and Pu and Np from spent fuel in power reactor. In this paper, the effect of nitric acid on the γ-radiation and liquid radiolysis products of DMHA was studied. The results showed that 0.1 and 0.5 mol·L-1 DMHA had the best irradiation stability in the 0.3-1.0 mol·L-1 nitric acid solution under U, Pu separation cycle and Pu purification cycle irradiation dose When the absorbed dose is 5-25k Gy, the liquid radiolysis products of DMHA nitric acid solution are mainly monomethylhydroxylamine, formaldehyde, formic acid and nitrous acid.The concentration of organic matter is much higher than that of nitrous acid, and with the dosage of nitric acid Concentration.When the concentration and dose of nitric acid were the same, the concentration of methylhydroxylamine produced by 0.1 mol·L-1DMHA was higher than that of 0.5 mol·L-1DMHA, but the formaldehyde concentration of the former was lower than that of the other When the concentration of nitric acid is high, the concentration of formic acid produced by 0.1 mol·L-1 DMHA radiolysis is higher than that of 0.5 mol·L-1DMHA.The relationship between nitrite concentration and nitric acid concentration and dose depends on initial DMHA concentration and nitric acid concentration.