Simulation and control of a passively cooled small modular reactor

Samet E. Arda, Keith Holbert

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This work regulates a small modular reactor (SMR) with traditional control methodologies and analyzes its response to typical disturbances. An analytical model for the passively cooled NuScale SMR is developed to represent the essential dynamics. The MATLAB/Simulink based model consists of reactor core, steam generator, pressurizer, hot leg riser and downcomer, and turbine representations. The point kinetics equations with a single combined neutron precursor group and the lumped parameter representations with single-phase natural circulation account for the neutronics and thermohydraulics in the reactor core. A lumped parameter, moving-boundary approach forms the basis of the nonlinear model adopted for the once-through helical-coil heat exchangers in which boundaries between regions of different fluid states (i.e., subcooled, boiling, and superheated) vary over time. A proportional-integral-derivative controller employing a sliding-average temperature strategy commonly used for pressurized water reactors is implemented. The responses of the SMR to two different disturbances are analyzed and discussed in detail. For the first scenario, a 5% step increase in the load is applied to the system, which results in a change in the steam valve opening. For comparison, two different simulations under this same disturbance are run: one including and one excluding the control systems. The second scenario tests the effectiveness of the control system to increase (or decrease) the reactor thermal power to a certain level within a desired time period. The simulation results show that important system variables are kept at the desired values by the proposed control strategy.

Original languageEnglish (US)
Title of host publication10th International Topical Meeting on Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies, NPIC and HMIT 2017
PublisherAmerican Nuclear Society
Pages312-321
Number of pages10
Volume1
ISBN (Electronic)9781510851160
StatePublished - Jan 1 2017
Event10th International Topical Meeting on Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies, NPIC and HMIT 2017 - San Francisco, United States
Duration: Jun 11 2017Jun 15 2017

Other

Other10th International Topical Meeting on Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies, NPIC and HMIT 2017
CountryUnited States
CitySan Francisco
Period6/11/176/15/17

Keywords

  • Dynamic modeling
  • Natural circulation
  • Reactor control
  • Small modular reactor

ASJC Scopus subject areas

  • Human-Computer Interaction
  • Nuclear Energy and Engineering
  • Energy Engineering and Power Technology

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  • Cite this

    Arda, S. E., & Holbert, K. (2017). Simulation and control of a passively cooled small modular reactor. In 10th International Topical Meeting on Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies, NPIC and HMIT 2017 (Vol. 1, pp. 312-321). American Nuclear Society.