%THER Card

This card is used to set the T-H parameters. It also activates T-H feedback. When %THER card present, either conditions must be satisfied

  1. %FTEM and one or more of these cards shall also present: %MTEM and %CDEN
  2. %XTAB shall be present
%THER Variable Description Remarks
LINE 1 PPOW Percent reactor power 0.0 < PPOW <= 100.0
LINE 2 POW Reactor thermal power for given geometry in %GEOM card in Watt  
LINE 3 TIN Coolant inlet temperature in Kelvin  
  CMFLOW Coolant mass flow rate in kg/s  
LINE 4 RF Fuel meat (UO2) radius in meter  
  TG Gap thickness in meter  
  TC Cladding thickness in meter  
  PPITCH Fuel pin pitch in meter  
LINE 5 NFPIN Number of fuel pin for each assembly  
  NGT Number of guide tubes  
LINE 6 CF Fraction of heat directly deposited in the coolant via radiative heat transfer  
    Typical value for PWR is around 0.019  
LINE 7 POPT Print option if users want to print this card Optional

Example:

! THERMAL-HYDRAULIC CARD
%THER
100.                                ! Percent power in %
891.25e6                            ! Reactor thermal power for quarter geometry in Watt
560.  82.121243523                  ! Inlet coolant temp. (Kelvin) and Fuel Assembly Mass flow rate (kg/s)
3.951E-03  5.9E-05  5.73E-04  1.26E-2 ! Fuel meat rad., gap thinkness, cladding thinkness and pin picth (m)
264  25                               ! Number of fuel pin and guide tubes
0.0                                   ! FRACTION OF HEAT DEPOSITED IN COOLANT
1