Impact of 33% break initiated at t=57.6min. Average riser ∆T saw a 7.4 • C rise . . . 191 Impact of 33% break initiated at t=57.6min. Average riser heat flux saw a -9.33%
The Natural convection Shutdown heat removal Test Facility (NSTF) at Argonne National Laboratory (Argonne) was built to study the performance of passive safety systems for advanced nuclear reactors. It is a large-scale thermal hydraulics test facility designed to carry out highly instrumented experiments to validate the performance of Reactor Cavity Cooling System (RCCS) concepts for reactor decay heat removal that rely on natural convection cooling with either air-or water-based systems. With the successful conclusion of the airbased testing program in FY16, the transition to a water-based RCCS concept is underway. The overall assembly of the water-based NSTF will reflect a ½ axial scale and 12.5° sector slice of the primary design features of a full scale AREVA concept.This report documents the FY17 progress and achievements made in the computational analyses of the water-based NSTF. Both system-level and high fidelity Computational Fluid Dynamics (CFD) analyses were performed to gain a complete understanding of the complex flow and heat transfer phenomena in natural convection systems. The progress on the waterbased NSTF design, instrumentation, and test planning are summarized in a companion report (ANL-ART-98).The primary objective of the NSTF analyses is to assess the limitations in typical approaches for modeling this type of natural circulation RCCS concepts, and validate the analysis methods and computer codes which may be used in licensing. Additionally, the NSTF analyses aid in the RCCS design optimization, and supporting experiment activities, i.e. helping assure that the experimental procedures, setup, and measurements follow best practices and produce high quality, traceable data.
The recurrence rate and residual rate were 4.16% and 0%, respectively. All ears were dry within 8-10 weeks. Aural discharge was detected in two cases and controlled with antibiotic ear drops without complications. The dry ear rate was 95.8%. The air-bone gap closure had a mean of 17.2 +/- 2 dB. No obvious complication occurred after operations.
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