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Home / SNAP / Plug-ins / PARCS Plug-in /

PARCS Plug-in

Purdue Advanced Reactor Core Simulator for reactor kinetics simulation.   The Purdue Advanced Reactor Core Simulator (PARCS) is a computer code that solves the time-dependent two-group neutron diffusion equation in three-dimensional Cartesian geometry using nodal methods to obtain the transient neutron flux distribution. The code may be used in the analysis of reactivity-initiated accidents in light water reactors where spatial effects may be important. It may be run in the stand-alone mode or coupled to other NRC thermal-hydraulic codes such as RELAP5 and TRACE.  Through coupling with TRACE, the capabilities for RAMONA, NRC's legacy kinetics code are recovered.

Change Log

Version 2.9.0 - Released 4/29/2022:

  • The PARCS plug-in was updated to support version 3.4.0 of the PARCS input specification. The import dialog version selector now includes Version 3.4. The PARCS batch ASCII import command now allows version tag "V34".
  • An update was made to support the new HYBRID_DEPL CNTL block record.
  • The display name and help text for the Boron Initial Coolant Concentration property was updated to match the description for the user_pc word on the CNTL_PPM record.
  • Added a model warning indicating that the Control Rod Bank Positions (BANK_POS - cbpos) will be ignored when the Depletion Component's Rod Position flag (INP_OPT - lcrp) is set to True.
  • The following new records were added:
    • Perturb. control rod absorption (PERT_CROD).
    • Transient record Auto Timestep Sizing (DELT).
    • Linear Combination Mode for the EFF_DOPLT.
  • An update was added to support the cylindrical geometry mesh and neutronics mesh dimensioning cards GRID_R/T, and NEUTMESH R/T.
  • An update was made to support the FDBK block's BYPASS_TH record.
  • The following updates were made to the TRAN Block
    • An update was made to enable the Impose Reactivity (IMPOSE_RHO record) properties under more circumstances.
    • An update was made to support the import of the CNV_TH_TR and NODAL_TR cards.
  • The TH Block was updated to include support for the TRAN_TIN and TRAN_MFLOW records.
  • The following updates were made to the DEPL component
    • An update was made to support the new Read Samarium Data flag (LSAM) for the INP_OPT record.
    • The help text and name of the PXSS property (OUT_OPT Record) was updated to use the name and description of the PKXS Property in the PARCS 3.4.0 User Manual.
    • The help text of the Core Heavy Metal Mass property (CORE_MASS Record) was updated to match the description in the PARCS 3.4.0 User Manual.
    • Support was added for the following DEPL records ISO_SOLV, ISO_SKIP, and ISO_CLIP.
  • An issue was resolved where the INT_TH record was written as enabled even when the enabling value was set to False.
  • The IO logic was updated to support word 19 LEDD on the TREE_XS record.
  • The GAMMA_FRAC card is now always included when the model version is 3.4.0 and the CDC_DED card is written. This resolves an issue where PARCS 3.4.0 will generate an error if the GAMMA_FRAC card is not included and the CDC_DED card is.
  • The GROUP_SPEC card is now always included when the model version is 3.4.0 and a Hex geometry is used, or when the model version is 3.4.0 and the FMFD component is enabled.
  • The Initial Core Power (CORE_POW record plevel word) is now optional in depletion cases and defaults to 100.0. When the value is inactive, no CORE_POW property will be exported.
  • An update was made to support the PINCAL_LOC, DET_XY_LOC, DET_Z_LOC, DET_Z_WEI, and DET_NAME cards when using a HEXGEOM geometry type.
  • An issue has been resolved that caused the Depletion Case BANK_POS record to export with an incorrect multi-line format.
  • The '# Rodded Xsec Sets' (NCMPR), '# Fuel Temp Points' (NFUELXSEC), '#Coolant Temp. Points' (NRHOXSEC), '# Coolant Density Points', '# Boron Concentration Points' (NBORONXSEC), and 'Logical Control Option' (lOpt)  properties of the FUNC_TYPE record in the XSEC Block will now be active after import.
  • The 'NEM' kernel type is now included in the Param component's Nodal Kernel drop-down list.
  • The Thermal-hydraulic component's Fluid Temperature terms are now optional. Terms will only be exported when active.
  • The PARCS job step has been updated to support the PARCS stats file, which has been re-named from parcs.pst to parcs.parcs_xml.
  • An issue was resolved where the CORE_TYPE record would export all Core Types other than PWR or BWR as 'CANDU'. This issue prevented models with Core Types such as PBR (Pebble Bed Reactor) from exporting correctly.
  • An issue was resolved where the Lattice Pin Rows and Lattice Pin Columns properties were not set on import.
  • An update was made to support the 'Perturbed Reactivity' data in the IMPOSE_RHO card of the TRAN block.
  • PARAM block record NODAL_KERN will now use values 1 (ANM) and 2(NEM) for the FMFD word opt2d1d (Flag for selecting separated nonlinear nodal solver for the FMFD kernel).
  • The CRB_BPRA array in the core component is only written out if the depletion hcr_bpra property is active and set to TRUE.
  • The control rod group search sample was updated to work with version 3.4.0 of the PARCS analysis code.
  • The NEACRP sample included with the PARCS plug-in has been updated to work with PARCS V 3.4.

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