ONE-GROUP PERTURBATION THEORY APPLIED TO SUBSTITUTION MEASUREMENTS WITH VOID
Technical Report
·
OSTI ID:4799258
Formulas suitable for evaluating substitution measurements or single-rod experiments by means of one-group perturbation theory are derived. The diffusion coefficient may depend on direction and position. By using the buckling concept, the perturbed flux can be taken into account in a comparatively simple way. By using an unconventional definition of cells, a transition region is introduced logically. Experiments with voids around metal rods were analyzed. The agreement between extrapolated and directly measured buckling values is excellent, the buckling difference between lattices with water-filled and voided shrouds being 0.263 plus or minus 0.015 m/sup -2/, and 0.274 plus or minus 0.005 m/sup -2/ respectively. The differences between diffusion coefficients are delta D/sub r//D = 0.083 plus or minus 0.004, and delta D/sub z//D = 0.120 plus or minus 0.018. (auth)
- Research Organization:
- Aktiebolaget Atomenergi, Stockholm
- NSA Number:
- NSA-16-029993
- OSTI ID:
- 4799258
- Report Number(s):
- AE-72
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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