The unique concepts of American National Standard ANSI N15.18-1975 ''Mass Calibration Techniques for Nuclear Material Control'' are discussed in regard to the establishment and maintenance of control of mass measurement of Uranium Hexafluoride (UF sub 6 ) both within and between facilities. Emphasis is placed on the role of control of the measurements between facilities, and thus establish decision points for detection of measurement problems and making safeguards judgments. The unique concepts include the use of artifacts of UF sub 6 packaging cylinders, calibrated by a central authority, to introduce the mass unit into all of the industries' weighing processes. These are called Replicate Mass Standards (RMS). This feat is accomplished by comparing the RMS to each facility's In-House Standards (IHS), also artifacts, and thence the usage of these IHS to quantify the systematic and random errors of each UF sub 6 mass measurement process. A recent demonstration, which exchanged UF sub 6 cylinders between two facilities, who used ANSI N15.18-1975 concepts and procedures is discussed. The discussion includes methodology and treatment of data for use in detection of measurement and safeguards problems. The discussion incorporates the methodology for data treatment and judgments concerning (1) the common base, (2) measurement process off-sets, (3) measurement process precision, and (4) shipper-receiver bulk measurement differences. From the evidence gained in the demonstration, conclusions are reached as to the usefulness of the realistic criteria for detection of mass measurement problems upon acceptance of the concepts of ANSI N15.18-1975. (ERA citation 04:007522)

  • Supplemental Notes:
    • IAEA symposium on nuclear material safeguards, Vienna, Austria, 2 Oct 1978.
  • Corporate Authors:

    Atomics International Division

    Rocky Flats Plant
    Golden, CO  United States  80401

    National Engineering Laboratory

    Center for Mechanical Engineering & Process Technology
    Washington, DC  United States 

    Department of Energy

    1000 Independence Avenue, SW
    Washington, DC  United States  20585
  • Authors:
    • Doeher, L W
    • Pontius, P E
    • Whetstone, J R
  • Publication Date: 1978

Media Info

  • Pagination: 15 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00191469
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: IAEA-SM-231/68, CONF-781007-7
  • Contract Numbers: EY-76-C-04-3533
  • Files: TRIS
  • Created Date: May 26 1979 12:00AM