constraint_eqn_052 Subroutine

   subroutine constraint_eqn_052(tmp_cc, tmp_con, tmp_err, tmp_symbol, tmp_units)
      !! Equation for tritium breeding ratio lower limit
      !! author: P B Lloyd, CCFE, Culham Science Centre
      !! args : output structure : residual error; constraint value;
      !! residual error in physical units; output string; units string
      !! Equation for tritium breeding ratio lower limit
      !! #=# fwbs
      !! #=#=# ftbr, tbrmin
      !! ? TODO should this only be for certain blanket models ?
      !! and hence also optional here.
      !! Logic change during pre-factoring: err, symbol, units will be assigned only if present.
      !! ftbr : input real : f-value for minimum tritium breeding ratio
      !! tbr : input real :  tritium breeding ratio (iblanket=2,3 (KIT HCPB/HCLL))
      !! tbrmin : input real :  minimum tritium breeding ratio (If iblanket=1, tbrmin=minimum 5-year time-averaged tritium breeding ratio)
      use constraint_variables, only: ftbr, tbrmin
      use fwbs_variables, only: tbr
      implicit none
            real(dp), intent(out) :: tmp_cc
      real(dp), intent(out) :: tmp_con
      real(dp), intent(out) :: tmp_err
      character(len=1), intent(out) :: tmp_symbol
      character(len=10), intent(out) :: tmp_units

      tmp_cc =  1.0D0 - ftbr * tbr/tbrmin
      tmp_con = tbrmin * (1.0D0 - tmp_cc)
      tmp_err = tbrmin * tmp_cc
      tmp_symbol = '>'
      tmp_units = ''

   end subroutine constraint_eqn_052