constraint_eqn_090 Subroutine

   subroutine constraint_eqn_090(tmp_cc, tmp_con, tmp_err, tmp_symbol, tmp_units)
      !! author: A. Pearce, G Turkington CCFE, Culham Science Centre
      !! args : output structure : residual error; constraint value;
      !! residual error in physical units; output string; units string
      !! Equation for minimum CS coil stress load cycles
      !! fncycle : input real : f-value for constraint n_cycle > n_cycle_min
      !! n_cycle : input real : Allowable number of cycles for CS
      !! n_cycle_min : input real :  Minimum required cycles for CS
      use CS_fatigue_variables, only: n_cycle, n_cycle_min, bkt_life_csf
      use constraint_variables, only: fncycle
      use cost_variables, only: ibkt_life, bktcycles
      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
      !! Switch to relay the calculated fw/blanket lifetime cycles as the minimum required CS stress cycles.
      !! bkt_life_cycle = 1 turns on the relay. Otherwise the models run independently.
      if (ibkt_life == 1 .and. bkt_life_csf == 1 ) then
         n_cycle_min = bktcycles
      end if

      tmp_cc =  1.0D0 - fncycle * n_cycle / n_cycle_min
      tmp_con = n_cycle_min * (1.0D0 - tmp_cc)
      tmp_err = n_cycle * tmp_cc
      tmp_symbol = '>'
      tmp_units = ''

   end subroutine constraint_eqn_090