C TSTD3D    SOURCE    FD218221  24/02/07    21:15:29     11834          
      subroutine TSTD3D(fcr,eplr3,deplr3,actif,ncr,
     # precision3d,log_reduc,reduc)
      
c     test refermeture excessive lors de l coulement et calcul du coeff
c     de reduction de retour radial
      
      implicit real*8 (a-h,o-z)
      implicit integer (i-n)
      
      integer ncr
      logical actif(ncr),actif_prec(ncr)
      real*8 fcr(ncr),eplr3(3),deplr3(3),precision3d
      logical log_reduc
      real*8 reduc,aux

      log_reduc=.false.
      reduc=1.d0
      do i=1,3
        if(actif(i)) then   
            if((eplr3(i)+deplr3(i)).lt.0.d0) then
                log_reduc=.true.
                aux=-eplr3(i)/deplr3(i)
                if(aux.ne.aux)then
                  print*,'Pb dans testref3d, reduc = NaN, mis a zero'
                  print*,i,eplr3(i),deplr3(i)
                  aux=0.d0
                end if  
c                print*,'tstd3d reduc(',i,')=',aux
                if(aux.le.precision3d) then
C                  print*,'pb dans tstd3d'
C                  print*,'reduc',reduc
                   reduc=0.d0
c                  on desactive le critere pour la prochaine iteration
                   actif(i)=.false.
                   fcr(i)=0.d0                   
C                  print*,'direction',i
C                  print*,'eplr3(i)',eplr3(i)
C                  print*,'deplr3(i)',deplr3(i)
C                  read*
                else
                   reduc=min(reduc,aux)
                end if
            end if
        end if
      end do
c      if(log_reduc)then
c          print*,'testref3d reduc',reduc
c      end if
        
      return
      end