Quality assurance plan for mixed oxide fuel for LMFBR Page: 4 of 9
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uing competence of fuel producers for the analysis of LMFBR/FFTF fuel at the level
required by fuel specifications.
Objective No. 1, as stated above, was considered the short-term goal of this
program. - In order to implement this program, material consisting of sintered pellets,
whose composition was approximately 80% U02 and 20% PuO2 was distributed to eight
participating organizations for analyses. Tnis program was intended to establish the
extent of the analytical capabilities of potential fuel suppliers for making the meas-
urements as outlined in the introduction.
EVALUATION OF OBJECTIVE No. 1
Lack of extensively-characterized materials suitable for all of the analyses and
measurements requested, and lack of common standards against which some of the analyti-
cal methods could be calibrated, limited the amount of information that was obtained
from the work done. Nevertheless, it was possible to obtain a picture of the capabil-
ities and limitations of existing methods, and to some extent the capabilities of parti-
cipating laboratories to use them. Problem areas were clearly indicated with respect
to the needs for,
(1) common standards with which to calibrate certain existing methods
(2) standardization of certain methods
(3) modifying existing methods, or developing new methods, for some measure-
(4) certain laboratories to expand their facilities
(5) certain laboratories to change some of their methods.
A trip was made to each of the participating organizations to discuss the results
on the analyses of the above material. One of the things that came out as a result of
these discussions was that no well-defined quality control programs were in evidence
for continual calibration of methods. As a follow-up of this first evaluation, a de-
signed "round robin" was constructed with definite recommendations regarding: (a) sam-
ple preparation where special care is to be exercised, (b) specific methods where needed
for better precision, and (c) modifications in some methods where improvements would ob-
viously result. Also, the "round robin" was designed to make the data amenable to statis-
tical analysis. As an example, the following instructions were supplied to each of the
analytical laboratories for the Uranium Assay: "Five sintered pellets are to be dis-
solved as received, each in a separate solution. One measurement for uranium is to be
made on each of four aliouots from each of these five solutions. Report each measurement
made unless you have valid reasons for not doing so. Standardizations of solutions and/
or calibrations of equipment must be made using NBS Primary U30g Standard No. 950. If
a controlled potential coulometric irethod is used, which is highly recommended, do not
use an electrical calibration." Similar instructions were used for the other items to
be measured. This set of data was termed Phase II of the project.
EVALUATION OF PHASE II DATA
The two major objectives of the statistical evaluation of the Phase II data were
(1) to obtain estimates of the precisions of the methods of analyses used by each par-
ticipating laboratory and (2) to determine how closely the results of the laboratories
agreed with each other. From this information, those analytical methods or laboratories
needing further improvement could be ascertained. The data was analyzed using the fol-
Yijk = + ci+ X1i+ eijk '
yijk is the result on the k-th replicate measurement on the j-th sample in the i-th
p is assumed to be constant which is the true value of the component being measured.
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Zeigler, R.K. Quality assurance plan for mixed oxide fuel for LMFBR, article, January 1, 1973; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1031945/m1/4/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.