**1. NAME AND TITLE**

TP1: A Computer Code System for the Calculation of Reactivity and Kinetic Parameters by
One-Dimensional Neutron Transport Perturbation Theory.

**2. CONTRIBUTOR**

Kernforschungszentrum Karlsruhe, West Germany.

**3. CODING LANGUAGE AND COMPUTER**

Fortran IV; IBM 3033.

**4. NATURE OF PROBLEM SOLVED**

TP1 is a transport theory code, developed to determine reactivity effects and kinetic parameters
such as effective delayed neutron fractions and mean generation time by applying the usual perturbation
formalism for one-dimensional geometry.

**5. METHOD OF SOLUTION**

Direct and adjoint angular dependent neutron fluxes are read from an interface file (INTFAC).
Multigroup cross sections are supplied in the SIGMN-block. Two perturbation options are included
in TP1: (a) the usual first order perturbation theory to determine the probe reactivities, and
(b) assuming there are available direct fluxes for the unperturbed reactor system and adjoint fluxes for
the perturbed system, the exact reactivity effect induced by the perturbation can be determined by an
exact perturbation calculation.

**6. RESTRICTIONS OR LIMITATIONS**

The IBM VS Fortran compiler is used, with LANGLVL(66). The interface file INTFAC and the
SIGMN file have to be copied by means of the IBM utility IEHMOVE to avoid loss of data.

**7. TYPICAL RUNNING TIME**

Execution of the program with the sample input takes about 11 seconds of CPU time on the IBM
3033.

**8. COMPUTER HARDWARE REQUIREMENTS**

TP1 is operable on the IBM 3033 computers.

**9. COMPUTER SOFTWARE REQUIREMENTS**

A Fortran 77 compiler is suggested.

**10. REFERENCE**

K. Kobayashi, "TP1: A Computer Program for the Calculation of Reactivity and Kinetic
Parameters by One-Dimensional Neutron Transport Perturbation Theory" (March 1979).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and one (1.2MB) DOS diskette which contains the source
code and sample problem input.

**12. DATE OF ABSTRACT**

February 1985.

**KEYWORDS: ** KINETICS; NEUTRON; PERTURBATION THEORY