constraint_eqn_009 Subroutine

   subroutine constraint_eqn_009(tmp_cc, tmp_con, tmp_err, tmp_symbol, tmp_units)
      !! Equation for fusion power upper 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 fusion power upper limit
      !! #=# physics
      !! #=#=# ffuspow, powfmax
      !! and hence also optional here.
      !! Logic change during pre-factoring: err, symbol, units will be assigned only if present.
      !! ffuspow : input real : f-value for maximum fusion power
      !! powfmax : input real : maximum fusion power (MW)
      !! fusion_power : input real : fusion power (MW)
      use constraint_variables, only: ffuspow, powfmax
      use physics_variables, only: fusion_power
      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 - ffuspow * powfmax/fusion_power
      tmp_con = powfmax * (1.0D0 - tmp_cc)
      tmp_err = fusion_power * tmp_cc
      tmp_symbol = '<'
      tmp_units = 'MW'

   end subroutine constraint_eqn_009