NEA-0001 AIREK-MOD.

AIREK-MOD, Time Dependent Reactor Kinetics with Feedback Differential Equation

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, FEATURES, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: AIREK-MOD.

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2. COMPUTERS

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Program name	Package id	Status	Status date
AIREK-MOD	NEA-0001/01	Tested	01-NOV-1967

Machines used:

Package ID	Orig. computer	Test computer
NEA-0001/01	IBM 360 series	IBM 360 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

Solves the reactor kinetic equations with respect to time. A standard form for the reactivity behaviour has been introduced in which the reactivity is given by the sum of a polynomial, sine, cosine and exponential expansion.
Tabular form is also included.
The presence of feedback differential equations in which the dependence on variables different from the considered one is considered enables many heat-exchange problems to be dealt with.

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4. METHOD OF SOLUTION

The method employed for the solution of the differential equations is the one developed by E.R. Cohen (Geneva Conference, 1958).

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The maximum number of differential equations that can be solved simultaneously is 50.
Within this limitation there may be n delayed neutron groups (n less than or equal to 25), on m other linear feedback equations (n+m less than or equal to 49).

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6. TYPICAL RUNNING TIME: 1-5 min. depending on the case.

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7. UNUSUAL FEATURES

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8. RELATED AND AUXILIARY PROGRAMS

AIREK-MOD is a program derived from AIREK-2. New features are the standard form for the reactivity, the presence in a number of differential equations of feedback variables different from the considered one and the production of a point-plot for the neutronic power.
AIREK-CDC is the CDC 1604A version of AIREK-MOD. It includes a modification to allow the output to be obtained after a sequence of n time steps, (data(499)=1-n). For data (499) greater than zero, the job will be stopped.

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9. STATUS

Package ID	Status date	Status
NEA-0001/01	01-NOV-1967	Tested at NEADB

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10. REFERENCES

- A. Schwartz:
Generalised Reactor Kinetics Code AIREK-II
NAA-SR-MEMO 4980 (1959)

NEA-0001/01, included references:

- C. Mongini-Tamagnini:
  AIREK-MOD: A Modified Version of the Kinetic Code AIREK II,
  EUR 1914.e (August 1964)
- C.E.T.I.S.:
  AIREK-MOD (How to use the code)

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11. MACHINE REQUIREMENTS: About 3k (+ library routines) core storage.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0001/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED

FORTRAN II under IBSYS, or FORTRAN II monitor. (IBM 7090).
IBM 360 Operating System.
CO-OP Monitor System (CDC1604).

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHOR

           C. Tamagnini
           CETIS
           EURATOM - C.C.R.
           Ispra (Varese), Italy

CDC 1604 version was offered by EIR (Institut Federal de Recherches en matiere de reacteurs, Switzerland).

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16. MATERIAL AVAILABLE

NEA-0001/01