A gas‐cooled reactor may be coupled directly to turbomachinery to form a closed‐Brayton‐cycle (CBC) system in which the CBC working fluid serves as the reactor coolant. Such a system has the potential to be a very simple and robust space‐reactor power system. Gas‐cooled reactors have been built and operated in the past, but very few have been coupled directly to the turbomachinery in this fashion. In this paper we describe the option for testing such a system with a small reactor and turbomachinery at Sandia National Laboratories. Sandia currently operates the Annular Core Research Reactor (ACRR) at steady‐state powers up to 4 MW and has an adjacent facility with heavy shielding in which another reactor recently operated. Sandia also has a closed‐Brayton‐Cycle test bed with a converted commercial turbomachinery unit that is rated for up to 30 kWe of power. It is proposed to construct a small experimental gas‐cooled reactor core and attach this via ducting to the CBC turbomachinery for cooling and electricity production. Calculations suggest that such a unit could produce about 20 kWe, which would be a good power level for initial surface power units on the Moon or Mars. The intent of this experiment is to demonstrate the stable start‐up and operation of such a system. Of particular interest is the effect of a negative temperature power coefficient as the initially cold Brayton gas passes through the core during startup or power changes. Sandia’s dynamic model for such a system would be compared with the performance data. This paper describes the neutronics, heat transfer, and cycle dynamics of this proposed system. Safety and radiation issues are presented. The views expressed in this document are those of the author and do not necessarily reflect agreement by the government.


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    Titel :

    A Gas‐Cooled‐Reactor Closed‐Brayton‐Cycle Demonstration with Nuclear Heating


    Beteiligte:
    Lipinski, Ronald J. (Autor:in) / Wright, Steven A. (Autor:in) / Dorsey, Daniel J. (Autor:in) / Peters, Curtis D. (Autor:in) / Brown, Nicholas (Autor:in) / Williamson, Joshua (Autor:in) / Jablonski, Jennifer (Autor:in) / El-Genk, Mohamed S. (Herausgeber:in) / Bragg, Mary J. (Herausgeber:in)

    Kongress:

    SPACE TECHNOLOGY AND APPLICATIONS INT.FORUM-STAIF 2005: Conf.Thermophys in Micrograv;Conf Comm/Civil Next Gen.Space Transp; 22nd Symp Space Nucl.Powr Propuls.;Conf.Human/Robotic Techn.Nat'l Vision Space Expl.; 3rd Symp Space Colon.; 2nd Symp.New Frontiers ; 2005 ; Albuquerque, New Mexico (USA)


    Erschienen in:

    AIP Conference Proceedings ; 746 , 1 ; 437-448


    Erscheinungsdatum :

    06.02.2005


    Format / Umfang :

    12 pages





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    A Gas-Cooled Reactor Closed-Brayton-Cycle Demonstration with Nuclear Heating

    Lipinski, R. J. / Wright, S. A. / Dorsey, D. J. et al. | British Library Conference Proceedings | 2005





    Dynamic Simulation of a Space Reactor System with Closed Brayton Cycle Loops

    El-Genk, Mohamed S. / Tournier, Jean-Michael P. / Gallo, Bruno M. | AIAA | 2010