A proposal to conduct blowdown transients in the blowdown test facility using the fuel test assembly simulator in preparation for the BTF-105a test (experiment BTF-10030). PDF Download
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Author: L. W. Dickson
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Languages : en
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Author: L. W. Dickson
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Author: R. D. Macdonald
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Languages : en
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Author: C. E. Ferris
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Languages : en
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Author: L. W. Dickson
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Languages : en
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Author: L. W. Dickson
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Languages : en
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Author: E. P. Stock
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Languages : en
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The btf-105 experiment in the blowdown test facility is one of a series of experiments sponsored by the candu owners group (cog) to determine the release, transport and deposition of fission products from nuclear fuel under high-temperature transient conditions. the btf-105 experiment has been broken up into two tests: btf-105a and btf-105b. the btf-105a test is a precursor to the btf-105b test, which will generate fission product release data used to benchmark candu safety analysis codes. the btf-105a test will be used to assess instrumentation and procedures to be used during btf-105b, and to generate correlations between fuel sheath and fuel centreline temperatures. fission product release and transport data will also be obtained from low burnup fuel. the btf-105a test consists of a fuel stringer containing a single unirradiated instrumented zircaloy-clad uo2 fuel element. the assembly will be irradiated at a linear power of 50 kw/m for 10 days to establish an inventory of fission products in the fuel. following the soak irradiation, the stringer will be subjected to a coolant blowdown where the volume average temperature of the uo2 will rise to and be maintained at about 1600-1800 degrees c for about 10 minutes. the fuel element is predicted to fail during the ramp up to this temperature due to complete oxidation of the sheath. fission products released during the transient will be monitored by gamma spectrometers. following the test, the fuel stringer will be removed from the reactor and destructively examined in the crl hot cells. grab samples from inside the test section will also be removed and analyzed for fission products. this report presents an overall plan for the activities to be completed before, during and after the btf-105a blowdown test.
Author: D. D. Semeniuk
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Languages : en
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Author: R. J. Zanatta
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Languages : en
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Author: J. A. Walsworth
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Languages : en
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Author: D. B. Reeves
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Languages : en
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The system to extend the assessment of thermal fuel behaviour (seatfb) micro-computer based software has been proposed for use in monitoring the temperatures for the blowdown test facility (ntf) test program. this software uses a symmetry approach based on existing thermocouple readings to predict temperatures on the trefoil sheath surfaces at locations not instrumented, or for locations where thermocouples have failed during the transient. the prediction of these "virtual thermocouples" can be used to assess the fuel conditions during the tests and for post-test analysis. the methodology used in the seatfb code has been documented in references 1 and 2. in order to verify the seatfb methodology described in these references, a computer code was developed in the exp-fio-140 sup(3) experiment. exp-fio-140 was the first instrumented trefoil assembly to be subjected to a loop coolant depressurization (blowdown) transient and was the commissioning test for the new trefoil design to be used the btf. the tests were performed in the x-2 loop of the nrx reactor. the data collected in this experiment was input to a computer code using the seatfb methodology and comparisons were made between predicted virtual transient temperatures and measured thermocouple readings for test number 7 of the exp-fio-140 blowdown series 1. test number 7 was chosen since it gave the longest period of sustained fuel sheath dryout in the test series. this report documents this comparison and gives an analysis of the results. since the seatfb methodology is only applicable for thermocouples experiencing similar cooling conditions, test 7 was chosen for comparison with code predictions due to this longer period of sustained dryout. it is shown that under conditions of single-phase cooling, the seatfb approach gives a good comparison with recorded temperatures from the exp-fio-140 test number 7.
