Significance and Use

Plutonium dioxide is used in mixtures with uranium dioxide as a nuclear-reactor fuel. In order to be suitable for this purpose, the material must meet certain criteria for plutonium content, isotopic composition, and impurity content. These test methods are designed to show whether or not a given material meets the specifications for these items as described in Specification C757 .

An assay is performed to determine whether the material has the minimum plutonium content specified on a dry weight basis.

Determination of the isotopic content of the plutonium in the plutonium dioxide powder is made to establish whether the effective fissile content is in compliance with the purchaser's specifications.

Impurity content is determined to ensure that the maximum concentration limit of certain impurity elements is not exceeded. Determination of impurities is also required for calculation of the equivalent boron content (EBC).

1. Scope

1.1 These test methods cover procedures for the chemical, mass spectrometric, and spectrochemical analysis of nuclear-grade plutonium dioxide powders and pellets to determine compliance with specifications.

1.2 The analytical procedures appear in the following order:

1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

1.4 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see Sections 6, 15, 24, 111, and 52.9 and 101.5.1 .

8.1 This test method covers the conditions necessary to preserve the integrity of plutonium dioxide samples. Conditions listed here are directed toward the analytical chemist. However, they are just as applicable to any group handling the material.

11.1 This test method covers the determination of 5 to 100 ? g/g of nitride nitrogen in 1-g samples of nuclear-grade plutonium dioxide.

19.1 This test method covers the determination of 10 to 200 ? g of residual carbon in nuclear-grade plutonium dioxide.

31.1 This test method covers the determination of 5 to 100 ? g/g of chlorine and 1 to 100 ? g/g of fluorine in 1-g samples of nuclear-grade plutonium dioxide.

39.1 This test method coves the determination of sulfur in the concentration range from 10 to 600 ? g/g for samples of nuclear-grade plutonium dioxide powders or pellets.

48.1 This test method covers the determination of dysprosium, europium, gadolinium, and samarium in plutonium dioxide (PuO ₂ ) in concentrations of 0.1 to 10 ? g/g of PuO ₂ .

FIG. 5 Schematic Diagram of Atmosphere Chamber

56.1 This test method covers the determination of 36 impurity elements in nuclear-grade plutonium dioxide (PuO ₂ ). The concentration ranges covered by the method and the analytical lines used for each element are listed in Table 1.

TABLE 1 Impurity Elements, Lines, and Concentration Limits

^A These elements are determined with the aid of a microphotometer.

^B These elements are analyzed by using a AgCl carrier and PdCl ₂ as an internal standard. Mix 20 mg of PdCl ₂ with 10.0 g of AgCl. Add 80 mg of this mixture to 120 mg of PuO ₂ sample-blend before loading 50-mg charges in a graphite electrode ASTM-Type-S-4 (follow 96.2.2).

71.1 This test method covers the determination of moisture in plutonium dioxide samples. Detection limits are as low as 10 ? g.

79.1 This test method covers the measurement of volatiles other than water in reactor-grade plutonium dioxide pellets ( 16 ). The lower limit of the test method using the described equipment and a sample of approximately 1 g is 0.01 cm ³ per gram of sample at STP conditions.

87.1 This test method covers the determination of rare earths in plutonium dioxide over the range from 10 to 200 ? g/g.

97.1 This test method covers the determination of the isotopic composition of plutonium in nuclear-grade plutonium dioxide powders and pellets.

106.1 This test method is applicable to the determination of the oxygen-to-metal atom ratio (O/M) in plutonium dioxide pellets and powders.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

C757 Specification for Nuclear-Grade Plutonium Dioxide Powder, Sinterable

C852 Guide for Design Criteria for Plutonium Gloveboxes

C1009 Guide for Establishing a Quality Assurance Program for Analytical Chemistry Laboratories Within the Nuclear Industry

C1068 Guide for Qualification of Measurement Methods by a Laboratory Within the Nuclear Industry

C1108 Test Method for Plutonium by Controlled-Potential Coulometry

C1128 Guide for Preparation of Working Reference Materials for Use in Analysis of Nuclear Fuel Cycle Materials

C1156 Guide for Establishing Calibration for a Measurement Method Used to Analyze Nuclear Fuel Cycle Materials

C1165 Test Method for Determining Plutonium by Controlled-Potential Coulometry in H2SO4 at a Platinum Working Electrode

C1168 Practice for Preparation and Dissolution of Plutonium Materials for Analysis

C1206 Test Method for Plutonium by Iron (II)/Chromium (VI) Amperometric Titration

C1210 Guide for Establishing a Measurement System Quality Control Program for Analytical Chemistry Laboratories Within the Nuclear Industry

C1235 Test Method for Plutonium by Titanium(III)/Cerium(IV) Titration

C1268 Test Method for Quantitative Determination of Americium 241 in Plutonium by Gamma-Ray Spectrometry

C1297 Guide for Qualification of Laboratory Analysts for the Analysis of Nuclear Fuel Cycle Materials

C1307 Test Method for Plutonium Assay by Plutonium (III) Diode Array Spectrophotometry

C1415 Test Method for 238Pu Isotopic Abundance By Alpha Spectrometry

C1432 Test Method for Determination of Impurities in Plutonium: Acid Dissolution, Ion Exchange Matrix Separation, and Inductively Coupled Plasma-Atomic Emission Spectroscopic (ICP/AES) Analysis

D1193 Specification for Reagent Water

E60 Practice for Analysis of Metals, Ores, and Related Materials by Spectrophotometry

E115 Practice for Photographic Processing in Optical Emission Spectrographic Analysis

E116 Practice for Photographic Photometry in Spectrochemical Analysis

Keywords

impurity content; isotopic composition; plutonium content; plutonium dioxide pellets; plutonium dioxide powders;

ICS Code

ICS Number Code 27.120.30 (Fissile materials and nuclear fuel technology)

DOI: 10.1520/C0697-10

ASTM International is a member of CrossRef.

ASTM C697