Effect of bundle size on cladding deformation in LOCA simulation tests. [PWR; BWR] Page: 2 of 24
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EFFECT OF BUNDLE SIZE ON CLADDING DEFORMATION
IN LOCA SIMULATION TESTS
R. II. Chapman J. L. Crowley
A. W. Longest
ABSTRACT
Two LOCA simulation tests were conducted to investigate
the effects of temperature uniformity and radial restraint
boundary conditions on Zircaloy cladding deformation. In one
of the tests (B-5), boundary conditions typical of a large
array were imposed on an inner 4x4 square array by two con-
centric rings of interacting guard fuel pin simulators. In
the other test (B-3), the boundary conditions were imposed on
a 4 x 4 square array by a non-interacting heated shroud. Test
parameters conducive to large deformation were selected in
ordor to favor rod-to-rod interactions.
The tests showed that rod-to-rod interactions play an
important role in the deformation process. While burst tem-
peratures and burst strains were not affected appreciably, the
interactions in the large array significantly influenced the
deformation patterns and caused greater volumetric expansion
of the interior simulators* Volumetric expansion of tho simu-
lators in the small array was significantly less than that for
the central array of the large test; burst strains were ap-
proximately the same. Burst temperature-pressure data for the
small array and for the outer ring of simulators in the large
array agreed with predictions based on single rod, heated
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Chapman, R.H.; Crowley, J.L. & Longest, A.W. Effect of bundle size on cladding deformation in LOCA simulation tests. [PWR; BWR], article, January 1, 1982; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1063572/m1/2/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.