Advanced Method of Pu content Precise Determination by Automatic Coulometric Titration

Full text of publication follows: In RIAR was developed the advanced Method of precise determination the Pu content in Pu dioxide and in MOX fuel by automatic coulometric titration (ACT). The basis of Method is the approach on Pu(VI) ions titration by electro-generated Fe(II) ions with amperometric indication of titration point. Titration of Pu(VI) is providing with using of special ACT apparatus which was developed in RIAR. In paper will include the description of taking measures for elimination or decreasing of random and systematic errors of Pu content determination. Developing advanced ACT Method is providing the total relative errors of Pu content determination less than 0,05 % with confidence probability 95 %. The RIAR advanced ACT Method was used for certification of Russian Standard Sample of 1. grade Pu dioxide. (authors)