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*DECK RESROD
SUBROUTINE RESROD(NB,NZ,ZZ,IND,ZLEVEL,ITOP,VB)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Move a control rod over a fuel channel.
*
*Copyright:
* Copyright (C) 2017 Ecole Polytechnique de Montreal.
*
*Author(s):
* A. Hebert
*
*Parameters: input
* NB number of fuel bundles per channel.
* NZ number of axial meshes.
* ZZ axial meshes.
* IND bundle index of each axial mesh.
* ZLEVEL insertion parameter of the control rod in the channel (set
* between 0.0 and 1.0).
* ITOP direction flag for the rod (=1: from top; =-1: from bottom).
*
*Parameters: output
* VB insertion parameter corresponding to each bundle.
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER NB,NZ,IND(NZ),ITOP
REAL ZZ(NZ+1),ZLEVEL,VB(NB)
*
ZMIN=ZZ(NZ+1)
ZMAX=ZZ(1)
DO IZ=1,NZ
IF(IND(IZ).EQ.0) CYCLE
ZMIN=MIN(ZZ(IZ),ZMIN)
ZMAX=MAX(ZZ(IZ+1),ZMAX)
ENDDO
IF(ITOP.EQ.1) THEN
VB(:NB)=0.0
ZPOS=ZMAX-ZLEVEL*(ZMAX-ZMIN)
DO IB=1,NB
ZBMIN=ZZ(NZ+1)
ZBMAX=ZZ(1)
DO IZ=1,NZ
IF(IND(IZ).EQ.IB) THEN
ZBMIN=MIN(ZZ(IZ),ZBMIN)
ZBMAX=MAX(ZZ(IZ+1),ZBMAX)
ENDIF
ENDDO
IF((ZPOS.GE.ZBMIN).AND.(ZPOS.LE.ZBMAX)) THEN
VB(IB)=1.0-(ZPOS-ZBMIN)/(ZBMAX-ZBMIN)
VB(IB+1:NB)=1.0
EXIT
ENDIF
ENDDO
ELSEIF(ITOP.EQ.-1) THEN
VB(:NB)=1.0
ZPOS=ZMIN+ZLEVEL*(ZMAX-ZMIN)
DO IB=1,NB
ZBMIN=ZZ(NZ+1)
ZBMAX=ZZ(1)
DO IZ=1,NZ
IF(IND(IZ).EQ.IB) THEN
ZBMIN=MIN(ZZ(IZ),ZBMIN)
ZBMAX=MAX(ZZ(IZ+1),ZBMAX)
ENDIF
ENDDO
IF((ZPOS.GE.ZBMIN).AND.(ZPOS.LE.ZBMAX)) THEN
VB(IB)=(ZPOS-ZBMIN)/(ZBMAX-ZBMIN)
VB(IB+1:NB)=0.0
EXIT
ENDIF
ENDDO
ENDIF
RETURN
END
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