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Title: Impact of Active Control on Passive Safety Response Characteristics of Sodium-Cooled Fast Reactors: II-Model Implementation and Simulations

Abstract

Advanced reactors are often claimed to be passively safe against unprotected upset events. In common practice, these events are not considered in the context of the plant control system, i.e., the reactor is subjected to classes of unprotected upset events while the normally programmed response of the control system is assumed not to be present. However, this approach constitutes an oversimplification since, depending on the upset involving the control system, an actuator does not necessarily go in the same direction as needed for safety. In this work, dynamic simulations are performed to assess the degree to which the inherent self-regulating plant response is safe from active control system override. The simulations are meant to characterize the resilience of the plant to unprotected initiators. The initiators were represented and modeled as an actuator going to a hard limit. Consideration of failure is further limited to individual controllers as there is no cross-connect of signals between these controllers. The potential for passive safety override by the control system is then relegated to the single-input single-output controllers. Here, the results show that when the plant control system is designed by taking into account and quantifying the impact of the plant control system onmore » accidental scenarios there is very limited opportunity for the preprogrammed response of the control system to override passive safety protection in the event of an unprotected initiator.« less

Authors:
 [1];  [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1389634
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Technology
Additional Journal Information:
Journal Volume: 199; Journal Issue: 1; Journal ID: ISSN 0029-5450
Publisher:
American Nuclear Society (ANS)
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; Active controllers; Dymola; Passive Safety; Sodium-cooled Fast Reactors

Citation Formats

Ponciroli, Roberto, Passerini, Stefano, and Vilim, Richard B. Impact of Active Control on Passive Safety Response Characteristics of Sodium-Cooled Fast Reactors: II-Model Implementation and Simulations. United States: N. p., 2017. Web. doi:10.1080/00295450.2017.1326783.
Ponciroli, Roberto, Passerini, Stefano, & Vilim, Richard B. Impact of Active Control on Passive Safety Response Characteristics of Sodium-Cooled Fast Reactors: II-Model Implementation and Simulations. United States. doi:10.1080/00295450.2017.1326783.
Ponciroli, Roberto, Passerini, Stefano, and Vilim, Richard B. Wed . "Impact of Active Control on Passive Safety Response Characteristics of Sodium-Cooled Fast Reactors: II-Model Implementation and Simulations". United States. doi:10.1080/00295450.2017.1326783. https://www.osti.gov/servlets/purl/1389634.
@article{osti_1389634,
title = {Impact of Active Control on Passive Safety Response Characteristics of Sodium-Cooled Fast Reactors: II-Model Implementation and Simulations},
author = {Ponciroli, Roberto and Passerini, Stefano and Vilim, Richard B.},
abstractNote = {Advanced reactors are often claimed to be passively safe against unprotected upset events. In common practice, these events are not considered in the context of the plant control system, i.e., the reactor is subjected to classes of unprotected upset events while the normally programmed response of the control system is assumed not to be present. However, this approach constitutes an oversimplification since, depending on the upset involving the control system, an actuator does not necessarily go in the same direction as needed for safety. In this work, dynamic simulations are performed to assess the degree to which the inherent self-regulating plant response is safe from active control system override. The simulations are meant to characterize the resilience of the plant to unprotected initiators. The initiators were represented and modeled as an actuator going to a hard limit. Consideration of failure is further limited to individual controllers as there is no cross-connect of signals between these controllers. The potential for passive safety override by the control system is then relegated to the single-input single-output controllers. Here, the results show that when the plant control system is designed by taking into account and quantifying the impact of the plant control system on accidental scenarios there is very limited opportunity for the preprogrammed response of the control system to override passive safety protection in the event of an unprotected initiator.},
doi = {10.1080/00295450.2017.1326783},
journal = {Nuclear Technology},
number = 1,
volume = 199,
place = {United States},
year = {2017},
month = {6}
}

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Works referenced in this record:

Development of the ALFRED reactor full power mode control system
journal, November 2015


Modelling of thermo-hydraulic power generation processes using Modelica
journal, February 2006

  • Casella, Francesco; Leva, Alberto
  • Mathematical and Computer Modelling of Dynamical Systems, Vol. 12, Issue 1
  • DOI: 10.1080/13873950500071082

Designing for Inherent Control in Liquid-Metal Advanced Small Modular Reactors
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Trends Versus Reactor Size of Passive Reactivity Shutdown and Control Performance
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  • Wade, David C.; Fujita, Edward K.
  • Nuclear Science and Engineering, Vol. 103, Issue 2
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Innovative Control Strategy for Fast Runback Operational Transient Applied to SMRs
journal, August 2015

  • Ponciroli, Roberto; Passerini, Stefano; Vilim, Richard B.
  • Nuclear Technology, Vol. 191, Issue 2
  • DOI: 10.13182/NT14-68

Impact of Active Control on Passive Safety Response Characteristics of Sodium-Cooled Fast Reactors: I—Theoretical Background
journal, June 2017


    Works referencing / citing this record:

    Modelling of thermo-hydraulic power generation processes using Modelica
    journal, February 2006

    • Casella, Francesco; Leva, Alberto
    • Mathematical and Computer Modelling of Dynamical Systems, Vol. 12, Issue 1
    • DOI: 10.1080/13873950500071082

    Impact of Active Control on Passive Safety Response Characteristics of Sodium-Cooled Fast Reactors: I—Theoretical Background
    journal, June 2017


    Development of the ALFRED reactor full power mode control system
    journal, November 2015