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Title: DRACS thermal performance evaluation for FHR

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Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Annals of Nuclear Energy (Oxford)
Additional Journal Information:
Journal Name: Annals of Nuclear Energy (Oxford); Journal Volume: 77; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-06-22 20:49:24; Journal ID: ISSN 0306-4549
Country of Publication:
United Kingdom

Citation Formats

Lv, Q., Lin, H. C., Kim, I. H., Sun, X., Christensen, R. N., Blue, T. E., Yoder, G. L., Wilson, D. F., and Sabharwall, P. DRACS thermal performance evaluation for FHR. United Kingdom: N. p., 2015. Web. doi:10.1016/j.anucene.2014.10.032.
Lv, Q., Lin, H. C., Kim, I. H., Sun, X., Christensen, R. N., Blue, T. E., Yoder, G. L., Wilson, D. F., & Sabharwall, P. DRACS thermal performance evaluation for FHR. United Kingdom. doi:10.1016/j.anucene.2014.10.032.
Lv, Q., Lin, H. C., Kim, I. H., Sun, X., Christensen, R. N., Blue, T. E., Yoder, G. L., Wilson, D. F., and Sabharwall, P. 2015. "DRACS thermal performance evaluation for FHR". United Kingdom. doi:10.1016/j.anucene.2014.10.032.
title = {DRACS thermal performance evaluation for FHR},
author = {Lv, Q. and Lin, H. C. and Kim, I. H. and Sun, X. and Christensen, R. N. and Blue, T. E. and Yoder, G. L. and Wilson, D. F. and Sabharwall, P.},
abstractNote = {},
doi = {10.1016/j.anucene.2014.10.032},
journal = {Annals of Nuclear Energy (Oxford)},
number = C,
volume = 77,
place = {United Kingdom},
year = 2015,
month = 3

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.anucene.2014.10.032

Citation Metrics:
Cited by: 5works
Citation information provided by
Web of Science

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  • Direct Reactor Auxiliary Cooling System (DRACS) is a passive decay heat removal system proposed for the Fluoride-salt-cooled High-temperature Reactor (FHR) that combines coated particle fuel and a graphite moderator with a liquid fluoride salt as the coolant. The DRACS features three coupled natural circulation/convection loops, relying completely on buoyancy as the driving force. These loops are coupled through two heat exchangers, namely, the DRACS Heat Exchanger and the Natural Draft Heat Exchanger. In addition, a fluidic diode is employed to minimize the parasitic flow into the DRACS primary loop and correspondingly the heat loss to the DRACS during normal operationmore » of the reactor, and to keep the DRACS ready for activation, if needed, during accidents. To help with the design and thermal performance evaluation of the DRACS, a computer code using MATLAB has been developed. This code is based on a one-dimensional formulation and its principle is to solve the energy balance and integral momentum equations. By discretizing the DRACS system in the axial direction, a bulk mean temperature is assumed for each mesh cell. The temperatures of all the cells, as well as the mass flow rates in the DRACS loops, are predicted by solving the governing equations that are obtained by integrating the energy conservation equation over each cell and integrating the momentum conservation equation over each of the DRACS loops. In addition, an intermediate heat transfer loop equipped with a pump has also been modeled in the code. This enables the study of flow reversal phenomenon in the DRACS primary loop, associated with the pump trip process. Experimental data from a High-Temperature DRACS Test Facility (HTDF) are not available yet to benchmark the code. A preliminary code validation is performed by using natural circulation experimental data available in the literature, which are as closely relevant as possible. The code is subsequently applied to the HTDF that is under construction at the Ohio State University.« less
  • This paper reports on two large-scale decay heat removal experiments analyzed to support the validation of the thermal-hydraulic code COMMIX and the design of advanced liquid metal reactors (ALMRs). The experiments were performed in the reactor vessel auxiliary cooling system (RVACS) test facility, which provides a scaled simulation of the passive decay heat removal paths of a pool ALMR with the core simulated by electrically heated rods. The first experiment simulates a transient where decay heat is removed by the direct reactor auxiliary cooling system (DRACS) only. In the second experiment, heat is removed by both the DRACS and RVACS.more » These experiments are characterized by (a) three-dimensional in-pool sodium flows of very low velocity, driven by sodium density differences, (b) a significant pool thermal stratification, and (c) a complex heat sink.« less
  • The concept of a forced stratified thermal energy storage tank which has multiple compartments divided by insulating and permeable horizontal plates is proposed for energy conservation. Performance of this tank is evaluated by a relatively simple evaluation method and compared with the ideal perfect stratified thermal energy storage tank and perfect mixed thermal energy storage tank. It is suggested that the performance of the forced stratified thermal energy storage tank is high and nearly comparable with the perfect stratified thermal energy storage tank.
  • Determination of thermal performance or efficiency of steam generators by traditional ASME procedures is a complex and difficult undertaking. When the fuel is municipal solid waste, additional variables are introduced to confound the procedures further. A new approach is proposed as a basis for discussion. The intent of the new approach is to reduce the time and effort required to achieve agreement that a municipal-solid-waste-fired steam generator has performed as specified and/or guaranteed. 5 references.