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*DECK LIBWRE
      SUBROUTINE LIBWRE(NTYP,IPRINT,ITLIB ,NGROUP,NL,IGRF,IGRL,NGR,
     >                  SCAT,SIGS,TOTAL,XSNG,SIGF,XSFI,XNU,DELTA,
     >                  DIL,DLJ,XSOUT,XSCOR,DSIGPL)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Resonance integral temperature and dilution interpolation.
*
*Copyright:
* Copyright (C) 1997 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
*Author(s): 
* G. Marleau
*
*Parameters: input
* NTYP    types of self shielding rates:
*         = 1 only absorption;
*         = 2 absorption+fission;
*         = 3 absorption+fission+scattering.
* IPRINT  print flag.
* ITLIB   types of library:
*         = 1 WIMS-AECL;
*         = 2 WIMS-D4.
* NGROUP  number of groups.
* NL      number of Legendre scattering order.
* IGRF    first resonance group to treat.
* IGRL    last resonance group to treat.
* NGR     number of resonance groups.
* SCAT    complete scattering matrix
*         SCAT(JG,IG) is from IG to JG.          
* SIGS    total scattering out of group.
* TOTAL   total XS.
* XSNG    (n,g) XS.
* SIGF    nu*fission XS.
* XSFI    fission XS
* XNU     1/nu
* DELTA   lethargy.
* DIL     standard dilution.
* DLJ     Livolant-Jeanpierre dilution.
* XSOUT   resonnances integrals.
* XSCOR   total correction.
* DSIGPL  potential XS times G-C parameters.
*
*-----------------------------------------------------------------------
*
      IMPLICIT NONE
      INTEGER     IOUT
      CHARACTER   NAMSBR*6
      PARAMETER  (IOUT=6,NAMSBR='LIBWRE')
*----
* INTEFACE VRAIABLES
*----
      INTEGER    NTYP,IPRINT,ITLIB,NGROUP,NL,IGRF,IGRL,NGR
      REAL       SCAT(NGROUP,NGROUP,NL),SIGS(NGROUP,NL),TOTAL(NGROUP),
     1           XSNG(NGROUP),SIGF(NGROUP),XSFI(NGROUP),
     2           XNU(NGROUP),DELTA(NGROUP),DIL(NGROUP),
     3           DLJ(NGROUP),XSOUT(NGROUP,7),XSCOR(4),DSIGPL(NGR)
*----
* LOCAL VARIABLES
*----
      INTEGER          IGRR,JG,IG1,IG2,IL
      REAL             XSF,DDIL,DDLJ
      DOUBLE PRECISION XNUMER,XDENOM
*
*-----
*
      IF(ABS(IPRINT) .GE. 100) THEN
        WRITE(IOUT,6000) NAMSBR 
      ENDIF
      DO 100 IGRR=IGRF,IGRL
        DDLJ=DLJ(IGRR)
        DDIL=DIL(IGRR)
        IF(ABS(IPRINT) .GE. 1000) THEN
          WRITE(IOUT,*) 'Potential XS*GC parameter ',DSIGPL(IGRR-IGRF+1)
        ENDIF
        IF(NTYP.EQ.3.AND.XSCOR(3).GT.0.0) THEN
*----
*  COMPUTE FLUX
*  SCATTERING IS SELF-SHIELDED
*----
          IF(IGRR .EQ. IGRF) THEN
            IF(ABS(IPRINT) .GE. 100) THEN
              WRITE(IOUT,6020)  
            ENDIF
          ENDIF
          IF(ITLIB.EQ.1) THEN
            XNUMER=DBLE(DDLJ-XSOUT(IGRR,1))
            DO 110 JG=1,IGRR-1
              XNUMER=XNUMER+DBLE(
     >        XSOUT(JG,4)*DELTA(JG)*SCAT(IGRR,JG,1)/DELTA(IGRR))
 110        CONTINUE
            XDENOM=DBLE(DDLJ+SIGS(IGRR,1)-SCAT(IGRR,IGRR,1))
            XSOUT(IGRR,4)=REAL(XNUMER/XDENOM)
            XNUMER=DBLE(DDIL-XSOUT(IGRR,1))
            DO 115 JG=1,IGRR-1
             XNUMER=XNUMER+DBLE(
     >        XSOUT(JG,5)*DELTA(JG)*SCAT(IGRR,JG,1)/DELTA(IGRR))
 115        CONTINUE
            XDENOM=DBLE(DDIL+SIGS(IGRR,1)-SCAT(IGRR,IGRR,1))
            XSOUT(IGRR,5)=REAL(XNUMER/XDENOM)
          ELSE
            XSOUT(IGRR,4)=(DDLJ-XSOUT(IGRR,1))/DDLJ
            XSOUT(IGRR,5)=(DDIL-XSOUT(IGRR,1))/DDIL
          ENDIF
          IF(ABS(IPRINT) .GE. 1000) THEN
            WRITE(IOUT,*) 'Flux 2 ',XSOUT(IGRR,4)
          ENDIF
          IF(XNU(IGRR).NE.0.0) THEN
             XSOUT(IGRR,6)=XSOUT(IGRR,2)/XNU(IGRR)
          ELSE
             XSOUT(IGRR,6)=0.0
          ENDIF
          XSOUT(IGRR,7)=XSOUT(IGRR,1)-XSOUT(IGRR,6)
          IF(ABS(IPRINT) .GE. 1000) THEN
            WRITE(IOUT,*) 'Total ',XSOUT(IGRR,1),XSOUT(IGRR,3),
     >                 XSOUT(IGRR,1)+XSOUT(IGRR,3)
          ENDIF
          XSOUT(IGRR,1)=XSOUT(IGRR,1)+XSOUT(IGRR,3)
        ELSE IF(XSCOR(1).GT.0.0) THEN
*----
*  COMPUTE FLUX AND DRAGLIB FLUX
*  SCATTERING IS NOT SELF-SHIELDED
*----
          IF(IGRR .EQ. IGRF) THEN
            IF(ABS(IPRINT) .GE. 100) THEN
              WRITE(IOUT,6021)  
            ENDIF
          ENDIF
          IF(ITLIB.EQ.1) THEN
            XNUMER=DBLE(DDLJ-XSOUT(IGRR,1))
            DO 120 JG=1,IGRR-1
              XNUMER=XNUMER+DBLE(
     >          XSOUT(JG,4)*DELTA(JG)*SCAT(IGRR,JG,1)/DELTA(IGRR))
 120        CONTINUE
            XDENOM=DBLE(DDLJ+SIGS(IGRR,1)-SCAT(IGRR,IGRR,1))
            XSOUT(IGRR,4)=REAL(XNUMER/XDENOM)
            IF(ABS(IPRINT) .GE. 1000) THEN
              WRITE(IOUT,*) 'Flux 1 ',XSOUT(IGRR,4),XNUMER,XDENOM
            ENDIF
            XNUMER=DBLE(DDIL-XSOUT(IGRR,1))
            DO 130 JG=1,IGRR-1
              XNUMER=XNUMER+DBLE(
     >          XSOUT(JG,5)*DELTA(JG)*SCAT(IGRR,JG,1)/DELTA(IGRR))
 130        CONTINUE
            XDENOM=DBLE(DDIL+SIGS(IGRR,1)-SCAT(IGRR,IGRR,1))
            XSOUT(IGRR,5)=REAL(XNUMER/XDENOM)
          ELSE
            XSOUT(IGRR,4)=(DDLJ-XSOUT(IGRR,1))/DDLJ
            XSOUT(IGRR,5)=(DDIL-XSOUT(IGRR,1))/DDIL
            IF(ABS(IPRINT) .GE. 1000) THEN
              WRITE(IOUT,*) 'Flux 2 ',XSOUT(IGRR,4)
            ENDIF
          ENDIF
          XSOUT(IGRR,3)=SIGS(IGRR,1)*XSOUT(IGRR,4)
          IF(NTYP.LT.2) THEN
            XSOUT(IGRR,2)=SIGF(IGRR)*XSOUT(IGRR,4)
          ENDIF
          IF(XNU(IGRR).NE.0.0) THEN
            XSOUT(IGRR,6)=XSOUT(IGRR,2)/XNU(IGRR)
          ELSE
            XSOUT(IGRR,6)=0.0
          ENDIF
          IF(ABS(IPRINT) .GE. 1000) THEN
            WRITE(IOUT,*) 'Total ',XSOUT(IGRR,1),
     >      SIGS(IGRR,1)*XSOUT(IGRR,5),
     >      XSOUT(IGRR,1)+SIGS(IGRR,1)*XSOUT(IGRR,5)
          ENDIF
          XSOUT(IGRR,1)=SIGS(IGRR,1)*XSOUT(IGRR,5)+XSOUT(IGRR,1)
          XSOUT(IGRR,7)=XSOUT(IGRR,1)-XSOUT(IGRR,3)-XSOUT(IGRR,6)
        ELSE IF(XSOUT(IGRR,4).NE.0.0) THEN
          IF(IGRR .EQ. IGRF) THEN
            IF(ABS(IPRINT) .GE. 100) THEN
              WRITE(IOUT,6022)  
            ENDIF
          ENDIF
          IF(XNU(IGRR).NE.0.0) THEN
            XSOUT(IGRR,6)=SIGF(IGRR)*XSOUT(IGRR,4)/XNU(IGRR)
          ELSE
            XSOUT(IGRR,6)=0.0
          ENDIF
          XSOUT(IGRR,1)=TOTAL(IGRR)*XSOUT(IGRR,4)
          XSOUT(IGRR,2)=SIGF(IGRR)*XSOUT(IGRR,4)
          XSOUT(IGRR,3)=SIGS(IGRR,1)*XSOUT(IGRR,4)
          XSOUT(IGRR,7)=XSOUT(IGRR,1)-XSOUT(IGRR,3)-XSOUT(IGRR,6)
          IF(ABS(IPRINT) .GE. 1000) THEN
            WRITE(IOUT,*) 'Total ',TOTAL(IGRR)*XSOUT(IGRR,4)
          ENDIF
        ELSE
          IF(IGRR .EQ. IGRF) THEN
            IF(ABS(IPRINT) .GE. 100) THEN
              WRITE(IOUT,6023)  
            ENDIF
          ENDIF
          XSOUT(IGRR,4)=1.0
          IF(XNU(IGRR).NE.0.0) THEN
            XSOUT(IGRR,6)=SIGF(IGRR)/XNU(IGRR)
          ELSE
            XSOUT(IGRR,6)=0.0
          ENDIF
          XSOUT(IGRR,1)=TOTAL(IGRR)
          XSOUT(IGRR,2)=SIGF(IGRR)
          XSOUT(IGRR,3)=SIGS(IGRR,1)
          XSOUT(IGRR,7)=XSOUT(IGRR,1)-XSOUT(IGRR,3)-XSOUT(IGRR,6)
          IF(ABS(IPRINT) .GE. 1000) THEN
            WRITE(IOUT,*) 'Total ',TOTAL(IGRR)
          ENDIF
        ENDIF
 100  CONTINUE
      DO 142 IG2=IGRF,IGRL
        XSF=XSOUT(IG2,3)/(XSOUT(IG2,4)*SIGS(IG2,1))
        DO 141 IL=1,NL
          DO 140 IG1=1,NGROUP
            SCAT(IG1,IG2,IL)=XSF*SCAT(IG1,IG2,IL)
 140      CONTINUE
 141    CONTINUE
 142  CONTINUE
      IF(ABS(IPRINT) .GE. 100) THEN
        WRITE(IOUT,6010) 'FLUX            '
        WRITE(IOUT,6011) (XSOUT(IG1,4),IG1=IGRF,IGRL)
        WRITE(IOUT,6010) 'TOTAL RATE      '
        WRITE(IOUT,6011) (XSOUT(IG1,1),IG1=IGRF,IGRL)
        WRITE(IOUT,6010) 'TOTAL XS        '
        WRITE(IOUT,6011) (XSOUT(IG1,1)/XSOUT(IG1,4),IG1=IGRF,IGRL)
        WRITE(IOUT,6010) 'FISSION RATE    '
        WRITE(IOUT,6011) (XSOUT(IG1,2),IG1=IGRF,IGRL)
        WRITE(IOUT,6010) 'FISSION XS      '
        WRITE(IOUT,6011) (XSOUT(IG1,2)/XSOUT(IG1,4),IG1=IGRF,IGRL)
        WRITE(IOUT,6010) 'SCATTERING RATE '
        WRITE(IOUT,6011) (XSOUT(IG1,3),IG1=IGRF,IGRL)
        WRITE(IOUT,6010) 'SCATTERING XS   '
        WRITE(IOUT,6011) (XSOUT(IG1,3)/XSOUT(IG1,4),IG1=IGRF,IGRL)
        WRITE(IOUT,6010) 'NG RATE         '
        WRITE(IOUT,6011) (XSOUT(IG1,7),IG1=IGRF,IGRL)
        WRITE(IOUT,6010) 'NG XS           '
        WRITE(IOUT,6011) (XSOUT(IG1,7)/XSOUT(IG1,4),IG1=IGRF,IGRL)
        WRITE(IOUT,6001) NAMSBR 
      ENDIF
      DO 150 IG1=IGRF,IGRL
        TOTAL(IG1)=XSOUT(IG1,1)/XSOUT(IG1,4)
        SIGF(IG1)=XSOUT(IG1,2)/XSOUT(IG1,4)
        XSF=XSOUT(IG1,3)/(XSOUT(IG1,4)*SIGS(IG1,1))
        SIGS(IG1,1)=XSOUT(IG1,3)/XSOUT(IG1,4)
        DO IL=2,NL
          SIGS(IG1,IL)=XSF*SIGS(IG1,IL)
        ENDDO
        XSFI(IG1)=XSOUT(IG1,6)/XSOUT(IG1,4)
        XSNG(IG1)=XSOUT(IG1,7)/XSOUT(IG1,4)
 150  CONTINUE
*----
*  RETURN LIBWRE
*----
      RETURN
*----
*  FORMAT
*----
 6000 FORMAT('(* Output from --',A6,'-- follows ')
 6001 FORMAT('   Output from --',A6,'-- completed *)')
 6010 FORMAT('   Record  = ',A16)
 6011 FORMAT(1P,5E15.7)
 6020 FORMAT(' Flux computed with self shielded scattering XS.')
 6021 FORMAT(' Flux computed without self shielded scattering XS.')
 6022 FORMAT(' Flux tabulated.')
 6023 FORMAT(' Flux initialized to unity.')
      END