NEA-0549 STAGT,STIG,STIGMA

1. NAME OR DESIGNATION OF PROGRAM:  STAGT,STIG,STIGMA,STABA.

3. NATURE OF PHYSICAL PROBLEM SOLVED

Stress analysis of graphite structures for the DRAGON high temperature reactor is performed by this family of computer codes. Two-dimensional plane strain irradiation dose dependent core problems have been solved.

4. METHOD OF SOLUTION

STAGT, which is the oldest in this series of programmes, can handle multiply connected regions but is confined to plane strain in x-y geometry. Variations in temperature loading during irradiation is accounted for (Wigner strain component.) STIG, is a version of STAGT where an anisotropic elasticity matrix has been introduced to handle transversely isotropic materials. An addi- tional feature of 'STIG' is the introduction of a boundary restraint condition of practical importance to prismatic gas cooled reactor core construction. This is defined as rotational plane strain in which free distortion of the prism arising from overall gradient of  temperature and/or fast neutron damage flux coincident with any single direction may be assumed to occur if variation of thermal expansion coefficient with irradiation is included. 'STIGMA' is intended for evaluation of stress and displacement in composite axi-symmetrical bodies subject to variable loadings in the axial and radial directions. The code has been prepared to take account of transverse isotropy in material characteristics for up to four separate bonded interface zones within a single composite material problem. Although specifically designed for the analysis of graphite structural components in the fast neutron irradiation environment of a reactor core, it is equally applicable to initial state design of  prestressed concrete pressure vessels and other problems involving rotational symmetry. 'STABA'-stress,temperature and bowing analysis. The aim of this quasi 3-D computer code is to apply the principle of rotational plane strain over the full length of a prismatic core component, taking into account spatial variations in fast neutron and thermal flux throughout a period of irradiation, to obtain the stress and bowing effects. A 2-D thermal evaluation option has been  included to save the time and work involved in the transfer of nodal point temperatures from other sources.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Depending on the computer, currently 800 nodes are foreseen.

6. TYPICAL RUNNING TIME:  Entirely dependent on problem size.

7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM

8. RELATED AND AUXILIARY PROGRAMS:  These four programmes are related but separate.

- B.E. Pitchford:
'STABA - Stress, Temperature and Bowing Analysis. A Code for Prismatic Graphite
Core Components of High Temperature Reactors', DPTN/782 (March 1976)
- A.N. Kinread:
'STAGT - A Two Material Version of the STAG Code Embodying Wigner Improvements'
Dragon Project Report 892 (August 1974)
- A.M. Kinkead:
'STIG - Stress in Transversely Isotropic Graphite. Two-Dimensional Two-Material
Code Embodying Rotational Plane Strain as An Option', D.P. Report 894 (August
1975)
- A.N. Kinkead: Addendum 1 to D.P. Report 894 (July 1975)

11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS

STABA has been tested at the NEA Databank on:
- COMPUTER : IBM Thinkpad T61p; Apple iMac i7 2800MHz
- OPERATING SYSTEM : MS Windows XP Professional; Ubuntu Linux 9.1 Kernel 2.6; Mac OS X 10.6.3
- COMPILER : GNU Fortran 4.5 (Windows); GNU Fortran 4.4.1 (Linux); GNU Fortran 4.3 (Mac OSX)

STAGT was compiled at the NEA Databank on:
- COMPUTER : IBM Thinkpad T61p Apple iMac i7 2800MHz
- OPERATING SYSTEM : MS Windows XP Professional; Ubuntu Linux 9.1 Kernel 2.6; Mac OS X 10.6.3
- COMPILER : GNU Fortran 4.5 (Windows); GNU Fortran 4.4.1 (Linux); GNU Fortran 4.3 (Mac OSX)

13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  Linux, Windows, Mac OSX

15. NAME AND ESTABLISHMENT OF AUTHOR

        A.N. Kinkead
        Dragon Project
        A.E.E., Winfrith, Dorchester, U.K.

makefile         Linux/Unix makefile
staba.f          Fortran source
staba.inp        Sample problem input
staba.nea.out    NEA sample output
NEA_549_2.pdf    Package documentation

makefile         Linux/Unix makefile
stagt.f          Fortran source
NEA_549_3.pdf    Package documentation
DPR0892.pdf      Second version of the report
P25-34EUI.pdf    An excerpt from a third version of the report
P35-42EUI.pdf    An excerpt from a third version of the report
P43-48EUI.pdf    An excerpt from a third version of the report

File name	File description	Records
NEA0549_04.001	STEGT2 SOURCE - F4 EBCDIC	1020
NEA0549_04.002	STEGT2 SAMPLE PROBLEM INPUT	348
NEA0549_04.003	STEGT2 SAMPLE PROBLEM OUTPUT	13236
NEA0549_04.004	JOB CONTROL AND INFORMATION	16

File name	File description	Records
NEA0549_05.001	STIG SOURCE - F4 EBCDIC	1614
NEA0549_05.002	STIG SAMPLE PROBLEM INPUT	486
NEA0549_05.003	STIG SAMPLE PROBLEM OUTPUT	4383
NEA0549_05.004	STIG JOB CONTROL AND INFORMATION	13
NEA0549_05.005	STIG SAMPLE PROBLEM PUNCHED CARD OUTPUT	324