**1. NAME AND TITLE**

CONDOR-3**: **Two-Dimensional Reactor Program with
Local and Spectrum Dependent Burnup.

**2. CONTRIBUTOR**

ARS,
Applicazioni Ricerche Scientifiche, Milano, Italy through the OECD Nuclear
Energy Agency Data Bank, Issy-les-Moulineaux, France.

**3. CODING LANGUAGE
AND COMPUTER**

Fortran IV; IBM 370 Series (C00811I037000).

**4. NATURE OF
PROBLEM SOLVED**

CONDOR-3 is a few group bi-dimensional, lifetime program. The types of reactor regions that can be considered are normal diffusion regions, non-diffusion or logarithmic regions in which a logarithmic derivative condition is given on the boundary and rodded regions which simulate the control rod poison properly smeared. The types of considered poisons are burnable poisons, poison diluted over the whole reactor according to the dilution factor theta and poison in the rodded regions. The types of diffusion calculations are straight Keff, dilution factor theta, poison in rodded region, and boundary of a rodded region.

The main differences of CONDOR-3 with respect to CONDOR-2 concern the following points: the depletion equations are solved mesh-wise instead of region-wise. The library of basic cross sections is still a microscopic library or a macroscopic library (to be used for non-lifetime calculations). However, one can use different basic microscopic libraries for different regions. Moreover, the basic microscopic library (or libraries) can be modified at each time step by the program itself by computational procedures that depend on the reactor type. The chains of burnable isotopes can be defined by the user without unjustified restrictions. However, a standard set of isotopic chains is built into the code. The isotopes can be assigned either constant self-shielding factors or concentration dependent self-shielding factors.

**5. METHOD OF
SOLUTION**

The method of spatial nodal expansion and the five points finite difference method are coupled. By means of the spatial nodal expansion the program determines the eigenvalue of the reactor (Keff, theta, poison or boundary of a rodded region). By means of the finite difference method, the program improves the above calculation and the group flux spatial distribution.

**6. RESTRICTIONS OR
LIMITATIONS**

Maximum number of - harmonics - 100, if number of groups = 1 or 2

85, if number of groups = 3

72, if number of groups = 4

nodes along x – 100

isotopes – 50

burnable isotopes – 40

mesh points – 12000

polynomial coefficients - 2000

**7. TYPICAL RUNNING
TIME**

More than 30 minutes.

**8. COMPUTER
HARDWARE REQUIREMENTS**

IBM 360 or IBM 370 mainframe.

**9. COMPUTER
SOFTWARE REQUIREMENTS**

IBM 360/OS.

**10. REFERENCES**

**a) Included Documentation**

E. Salina: “CONDOR-3, A Two-Dimensional Reactor Lifetime Program with Local and Spectrum Dependent Depletion,” RT 69/28 (November 1969).

**11. CONTENTS OF CODE
PACKAGE**

The package is distributed on a CD with a compressed zip file including source files, JCL, documentation and sample data and output.

**12. DATE OF ABSTRACT**

November 2013.

**KEYWORDS:** BURNUP, CONTROL ELEMENTS, DEPLETION,
LIFETIME, POISONING, TWO-DIMENSIONAL