ASTM C788-03(R2021) pdf free download

ASTM C788-03(R2021) pdf free download.Standard Specification for Nuclear-Grade Uranyl Nitrate Solution or Crystals
1. Scope
1.1 This specification applies to nuclear-grade aqueous uranyl nitrate solution or crystals not exceeding 5 % 235 U intended for subsequent manufacture into either UF 6 (for feed to an enrichment plant) or direct conversion to uranium oxide (for use in reactors). 1.2 This specification is intended to provide the nuclear industry with a general standard for aqueous uranyl nitrate solution or crystals. It recognizes the diversity of manufactur- ing methods and the processes to which it is subsequently to be subjected. It is therefore anticipated that it may be necessary to include supplementary specification limits by agreement be- tween purchaser and manufacturer. Different limits are appro- priate depending on whether or not the uranyl nitrate is to be converted to UF 6 for subsequent processing. 1.3 The purpose of this specification is: (a) to define the impurity and uranium isotope limits for commercial standard uranyl nitrate, and (b) to define additional limits for repro- cessed uranyl nitrate (or any mixture of reprocessed and commercial standard uranyl nitrate). For such uranyl nitrates, special provisions may need to be made to ensure that no extra hazard arises to the employees, the process equipment, or the environment. 1.4 The scope of this specification does not comprehen- sively cover all provisions for preventing criticality accidents, for health and safety, or for shipping. Observance of this standard does not relieve the user of the obligation to conform to all international, federal, state and local regulations for processing, shipping, or any other way of using the uranyl nitrate. An example of a U.S. Government Document is the Code of Federal Regulations, Title 10, Part 50 (latest edition). 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.7 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3.1.1 Terms shall be defined in accordance with Terminol- ogy C859, except for the following: 3.1.1.1 commercial standard uranyl nitrate—refers to ura- nyl nitrate made from unirradiated uranium. However, it is recognized that some contamination with reprocessed uranium may occur during routine processing; this is acceptable, pro- vided that the product meets the specification for commercial standard uranyl nitrate as defined in 4.2. 3.1.1.2 reprocessed uranyl nitrate—refers to any uranyl nitrate made from uranium that has been exposed in a neutron irradiation facility and subsequently chemically separated from the fission products and transuranic isotopes so generated. The limits given in this specification are intended to be typical of reprocessed spent fuel having achieved burn-up levels of up to 50 000 megawatt day per ton ofuranium in light water reactors and cooling for 10 years after discharge. It is recognized that different values would be necessary to accommodate different fuel histories.
6. Sampling
6.1 A representative sample of sufficient size to perform the tests prescribed herein shall be taken. Because of the potential presence of several liquid phases (organic materials), careful attention should be taken when sampling and subsampling. 6.2 Because of the potential presence of several liquid phases (organic materials) in uranyl nitrate solution, careful attention should be taken when sampling and subsampling.