MEASUREMENT OF MIGRATION AREA AND INFINITE MULTIPLICATION IN HIGHLY ENRICHED, CRITICAL REACTORS
Technical Report
·
OSTI ID:4331956
In principle it is possible to measure the migration area by critical measurements near zero buckling. If the product of the migration area and the buckling is less than 0.1, the true migration area can be obtained directly from the slope of the infinite multiplication factor plotted against the buckling. If M/sup 2/B/sup 2/ is greater than 0.1, this slope may differ from the true migration area by more than ten percent. In practice it is not often practicable to make critical measurements with reactors using highly enriched fuel having M/ sup 2/B/sup 2/ less than 0.1. The true migration area and the infinite multiplication factor can be determined, however, by fitting a polynomial in B/ sup 2/ to critical measurements of the thermal utilization at large as well as at intermediate values of B/sup 2/. This procedure will also define the minimum number of groups in a multigroup expression that correctly describes the reactor compositions studied. In the absence of measurements at large B/sup 2/, it is possible to define a migration area by fitting a two-group expression to the logarithm of a calculated thermal utilization plotted against the measured buckling. This curve can be used to predict criticality in the range of the measured buckling to within plus or minus a dollar of reactivity. (auth)
- Research Organization:
- Knolls Atomic Power Lab., Schenectady, N.Y.
- DOE Contract Number:
- W-31-109-ENG-52
- NSA Number:
- NSA-12-001069
- OSTI ID:
- 4331956
- Report Number(s):
- KAPL-M-SWK-6
- Country of Publication:
- United States
- Language:
- English
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