Analysis of the safeguards status of fuel reprocessing plants Page: 3 of 11
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The maximum value of E may be defined as the limit of error, L. If
the individual errors and fractions are then lumped in single terms for the
measured and estimated parts of the inventory, a simplified relationship is
obtained:
L2 . F2 E2 + Fe E2 (3)
m m e e
substituting: (1-Fm) for F
L2 . F2'E2 + (l-P )2 Ee (4)
m m a e
Equation (4) may now be used to define an allowable upper limit for
the error associated with that part of the inventory which must be estimated.
Ee = L2 - F2 EM2 (5)
or Ee = 123-Fp2E-2 (6)
V(1 -F
L is a constraint imposed by federal regulations. The effect of that
constraint will be evaluated by assuming values of 0.30%, 0.50% and 0.70%.
F is established by the nature of an existing process or can be
defined bymthe design of a new process. In the Idaho Chemical Processing Plant,
the fraction directly measurable falls in the range from 0.95 to 0.98, depen-
ding on the operating period (the ICPP is now run in two segments, with all
product in the first half of the process being collected in intercycle storage
tanks; the second cycle is routinely swept down at less than thirty-day inter-
vals). Conversion of several existing process tanks to accountability-type
tanks could increase the directly measurable fraction to 0.990 to 0.996,
depending on the type of fuel being processed. A set of typical sbsystem
inventories for ICPP processes is shown in Table 1. The effect of F will be
evaluated in the range from 0.950 to 0.998.
E is the aggregate error of direct measurement. It is established
by the character of the measurement techniques, sampling, and analytical errors.
Depending on the fuel being processed, E falls in the range from 0,5% to 0.72.
The effect of measurement error will be evaluated over the range from 0.2% to
0.7% (Em is the 95% confidence interval associated with the mean inventory
measurement).
Calculation of values for the maximum allowable error for the estimated
part of the inventory, Ee, in the three-factor space defined by L, Fm, and Em
will define a set of response surfaces. Thcse surfaces will provide a four-
dimensional contour map of Ee as a function of L, Fm, and Em*
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Brown, R.A. Analysis of the safeguards status of fuel reprocessing plants, article, January 1, 1974; Country unknown/Code not available. (https://digital.library.unt.edu/ark:/67531/metadc1020934/m1/3/: accessed April 27, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.