EXPERT GROUP ON REACTOR PHYSICS AND ADVANCED benchmark... · Nuclear Energy Division EGPRANS Meeting,…

  • Published on
    02-Sep-2018

  • View
    212

  • Download
    0

Embed Size (px)

Transcript

  • 1Nuclear Energy Division EGPRANS Meeting, Nice, May 2 2011

    EXPERT GROUP ON REACTOR PHYSICS AND

    ADVANCED NUCLEAR SYSTEMS

    "Sodium Fast Reactor core Feed-back and Transient

    response (SFR-FT) Task Force

    Review of Mandate and Planning of SFR Benchmark

    F Varaine (CEA, France)

  • 2Nuclear Energy Division EGPRANS Meeting, Nice, May 2 2011

    Introduction

    This SFR benchmark was a jointly CEA and ANL proposal

    It was proposed at the beginning of 2010 in the WPRS framework

    WPRS

    Expert Group on Reactor Physics and Advanced

    Nuclear Systems

    Expert Group on Reactor Fuel Performance

    Expert Group on Radiation

    Transport and Shielding

    Expert Group on Uncertainty Analysis in Modelling

  • 3Nuclear Energy Division EGPRANS Meeting, Nice, May 2 2011

    WPRS Mandate : reminder

    Main objective : the proposed SFR-FT Expert Group would work towards a shared analysis of the feedback and transient behaviour of next generation SFR concepts.

    Under the proposed mandate, this new WPRS expert group will perform a comparative analysis of the safety characteristics of different fuels types as metal, oxide, nitride and carbide cores.

    To achieve these goals, two complementary items are proposed : State of Art :

    review on core behaviour as function of fuel type and thermal power level

    Dedicated benchmarks in order to : share the analysis, agree on methodology give possible recommandations to improve safety design

    Scope of studies to be performed : rules of the game Sodium Fast Reactor U/Pu fuel cycle Thermal power : medium and large core size No moderator material, no heterogeneous core.

  • 4Nuclear Energy Division EGPRANS Meeting, Nice, May 2 2011

    WPRS Mandate : task description

    Proposed milestones : a step by step study

    Compile a state of the art report: review past and recent studies performed in the framework of sodium fast reactor and build a bibliographic repository which would stress core transient behaviours as a function of fuel characteristics (oxide, carbide, nitride and metal).

    Perform a parametric study based on two different core sizes: large size core (3600 MW thermal) and medium size core (1000-1500 MW thermal). For both cores sizes three types of fuel are proposed: oxide, carbide and metal. This comparative study is aiming at indentifying the advantages and drawbacks for each concept based on nominal performances and global safety parameters:

    Taking account of the results obtained in the previous step, transient calculations will be carried out on a few selected cases for the principal unprotected transients (UTOP, ULOF, ULOHS) and the core behaviours characterised using a matrix classification.

    Synthesis of the whole work into a final report including recommendations to improve safety and future work toward severe accidents and minor actinides management.

  • 5Nuclear Energy Division EGPRANS Meeting, Nice, May 2 2011

    Large core image : oxide and carbide fueled cores

    3 600 MWThSelf-breeder cores

  • 6Nuclear Energy Division EGPRANS Meeting, Nice, May 2 2011

    Medium core image : oxide and metal fueled cores

    1 000 MWThBurner cores

  • 7Nuclear Energy Division EGPRANS Meeting, Nice, May 2 2011

    Cores description

    For all cores, the benchmark document provide concentration description corresponding to equilibrium beginning of cycle configuration :

    Each initial Pu content is described by an averaged representative sub-assembly with 5 axial concentrations sets corresponding to local depleted zones

    Fission products isotopes are replaced by a representative lumped isotope (according to relevant absorption level) in order to have a generic description in terms of calculation tools.

    Geometric and medium descriptions enable both homogeneous and heterogeneous sub-assembly modelling suitable for deterministic or Monte-Carlo codes.

  • 8Nuclear Energy Division EGPRANS Meeting, Nice, May 2 2011

    Work to be performed

    Characterization of end of cycle state : core depletion

    K effective

    Sodium void effect

    Doppler constant

    Effective delayed neutron fraction

    Masse balance for Heavy Nuclei

  • 9Nuclear Energy Division EGPRANS Meeting, Nice, May 2 2011

    SFR Benchmark schedule

    T0 : may 2011

    Initiate expert group activities

    Provide core data for neutronic calculation

    T0+ 6 months ; december 2011

    Presentation of neutronic evaluations

    Discussion and agreement on feedback coefficient to be calculated and associated methods, definition on corresponding evaluation grid

    T0+ 12 months : June 2012

    Presentation of Feedback Coefficient results

    Discussion and agreement on transients to be calculated and definition on corresponding evaluation grid

    T0+ 18 months : December 2012

    Presentation and discussion of transient results

    Discussion on final report

    T0+ 24 months : June 2013

    Final report and recommendation for further activities

  • 10Nuclear Energy Division EGPRANS Meeting, Nice, May 2 2011

    SFR Benchmark : who does what ?

    T0 : may 2011 (done) Initiate expert group activities : OECD + SFR Benchmark participants Provide core data for neutronic calculation : OECD (provided by CEA and ANL) the official list of participants must be built by OECD (done ?)

    T0+ 6 months ; december 2011 Presentation of neutronic evaluations : SFR Benchmark participants / who

    compiles data and performs comparisons ? Discussion and agreement on feedback coefficient to be calculated and associated

    methods, definition on corresponding evaluation grid SFR Benchmark participants

    T0+ 12 months : June 2012 Presentation of Feedback Coefficient results : SFR Benchmark participants /

    who compiles data and performs comparisons ? Discussion and agreement on transients to be calculated and definition on

    corresponding evaluation grid

    T0+ 18 months : December 2012 Presentation and discussion of transient results SFR Benchmark participants Discussion on final report SFR Benchmark participants

    T0+ 24 months : June 2013

    Final report and recommendation for further activities SFR Benchmark participants

Recommended

View more >