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*DECK AFMXNC
SUBROUTINE AFMXNC (NGRP,SIGX,SIGF,FLUX,XXE,XNP,FLUR)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Computation of Xenon and Neptunium concentrations.
*
*Copyright:
* Copyright (C) 1996 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):
* M.T. Sissaoui
*
*Parameters: input
* NGRP
* SIGX Xenon absorption micro-x-section dimension (ngrp).
* SIGF fission macro-x-section dimension (ngrp).
* FLUX flux dimension (ngrp)
*
*Parameters: output
* XXE Xenon concentration
* XNP Neptunium concentration
* FLUR
*
*-----------------------------------------------------------------------
*
DIMENSION FLUX(NGRP),SIGF(NGRP),SIGX(NGRP),FLUR(NGRP)
REAL CF
* SET THE YIELD AND THE DECAY CONSTANTE FOR XENON AND NEPTUNIUM
XLAMBDAX = 2.09E-5
XLAMBDAI = 2.85E-5
GAMMAI = 0.0631
GAMMAX = 0.0045
* CF=1.E-24(barn)
CF=1.0E-24
CINTG=1.0E+13
* CALCUL DES TAUX DE FISSION
TAUF=0.0
TAUAX=0.0
FLR=0.0
FLX=0.0
DO 10 IGR = 1,NGRP
TAUF = TAUF+FLUX(IGR)*SIGF(IGR)
TAUAX = TAUAX+FLUX(IGR)*SIGX(IGR)
FLR=FLR+FLUR(IGR)*CINTG
FLX=FLX+FLUX(IGR)
10 CONTINUE
* COMPUTE THE XENON CONCENTRATION
XXE=CF*(GAMMAX+GAMMAI)*TAUF/(XLAMBDAX+TAUAX*CF)
* COMPUTE THE NEPTUNIUM CONCENTRATION
XNP=XNP*FLX/FLR
*
RETURN
END
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