Actions for Performance testing of single electrically heated fuel pin simulators for PWR LOCA experiments [electronic resource].

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Performance testing of single electrically heated fuel pin simulators for PWR LOCA experiments [electronic resource].

Published
Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1978.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 63 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The Blowdown Heat Transfer Program (PWR-BDHT) uses electrically heated fuel pin simulators in 49-rod bundles in steady-state and transient heat transfer experiments. Prototypical fuel pin simulators representative of the first two bundles have been tested singly for thermal, mechanical, and electrical performance in blowdown experiments in a single-rod loop. Preliminary nondestructive tests were performed on all simulators prior to testing. As a result of the testing program, simulators for two 49-rod bundles were bought. Representative samples of these two groups were tested in the same fashion as were the prototypes. The electrical performance of each tested simulator was excellent. Measured parameters were resistance of the internal heater element and resistance of the BN and MgO insulating materials. The mechanical performances of the simulators were very good with respect to operability and survivability. A disappointing result, however, was that gaps appeared between the inner and outer parts of the dual-walled steel sheaths of bundle 1 prototypes and production heaters; gaps also appeared in bundle 2 heaters, but the magnitudes seemed much smaller. The thermal performances of the simulators were good with the exception of one aspect--repeatability of thermocouple output from one experiment to the next. The gaps in heater sheaths grew as a function of temperatures cycling with resultant increases in thermal resistances across the gaps. This effect diminished with the number of cycles. Other aspects of thermal performance were completely satisfactory: (1) reproducibility of time and location to transient CHF, (2) thermal time constants of thermocouples, (3) proper power profile, and (4) repeatability of heat flux profile.
Report Numbers
E 1.99:ornl/nureg-35
ornl/nureg-35
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Other Subject(s)
Note
Published through SciTech Connect.
05/01/1978.
"ornl/nureg-35"
White, J.D.
Funding Information
W-7405-ENG-26
View MARC record | catkey: 14370013