NEA-0598 RSYST.

1. NAME OR DESIGNATION OF PROGRAM:  RSYST.

3. DESCRIPTION OF PROBLEM OR FUNCTION

RSYST is a modular system for reactor and shielding calculations. It consists of a system nucleus, utility modules, general data manipulation modules, reactor statics, burnup and shielding calculation modules, a data base and fast and thermal cross section libraries based on ENDF/B-IV. The computational path is defined in the card input using user control commands. User commands feature logical branches which permit the construction of loops in the module execution. Standard computational paths can be stored away in the data base and can later be activated by standard commands. RSYST stores all information in so-called data blocks of the data base. Each block in addition to the actual data contains data structure information. The system is integrated and data can be transferred between computational modules without need for rearrangement or transformation. The system nucleus takes care of the transfer of data between the data base and the modules, the utility modules can  be used to prepare data for use by subsequent modules (normalizations, interpolations, comparison of data, transformations through general mathematical functions), for editing and plotting data sheets.

4. METHOD OF SOLUTION

The computational modules are able to solve several reactor physics problems by the following methods:

- Zero-dimensional spectrum calculations in the fast energy range    by the Bn and/or Pl method.
- Zero-dimensional spectrum calculations in the thermal energy    range by the Bn method.
- Calculation of fluxes in the resonance domain by the Nordheim or    NR approximation.
-  Calculation of group constants by the gas model.
-  Homogenization and collapsing of group constants.
-  One-dimensional and two-dimensional neutron diffusion.
-  One-dimensional transport problems by the Sn method.
-  One-dimensional transport by the collision probability method.
-  Burnup equations with given flux conditions.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

No dynamic storage allocation is used. Some modules have fixed dimensions, some a unique data array, whose length is defined at compilation time and depends on the available storage in the computer used.

6. TYPICAL RUNNING TIME

The 36 sample problems, demonstrating the use of almost all modules take about 400 seconds CPU time on the IBM 360/91.

7. UNUSUAL FEATURES OF THE PROGRAM

Modular construction, automatic data management, simple to use.

8. RELATED AND AUXILIARY PROGRAMS

- A GGC-4 library based on ENDF/B-IV, 99 energy groups with 100    nuclides.
- A 126 energy group thermal library for graphite, water, at    different temperatures and other 53 nuclides.

- I.A. Bestrich, W.Golden, K.Kubler and R.Ruhle;
"Implementation of the Program System RSYST on the IBM 370/168
of the GFK at Karlsruhe"
ORNL-tr-2970 (IKE R No 4-35) December 1974.
- R.Ruhle;
"RSYST, an Integrated Modular System for Reactor and Shielding
Calculations"
- R.Ruhle;
"RSYST, an Integrated Modular System with Data Basis
for Automated Calculation of Nuclear Reactors"
ORNL-tr-2796 (IKE-BNR-4-12) January 1973
- RSYST Vol.2
"Module Description and Input Parameter Specification"
-Ernest G. Silver;
"RSYST - Short Description of the Modules"
ORNL-tr-4193
- R.Ruhle;
"RSYST-1-11 - Experience and Further Development"
ATKE Bd.26 (1975) Lfg.3
- R.Ruhle;
"Data Structure and Control of the Reactor Program System RSYST
1971 Reactor Conference of the German Atomic Forum/KTG in Bonn.
- R.Ruhle;
"RSYST, an Integrated Modular System for Reactor and Shielding
Calculations"
ANS Meeting, Ann Arbor, April 9-10 (1973)
- Enrico Sartori, NEA DB;
"Note to all RSYST Users"
NDB/3011/smg (29,Aug.1985)

11. MACHINE REQUIREMENTS

800 K bytes of fast core is the size necessary if the single modules are run without overlay. For small applications this size can be reduced considerably. Disc drives are  necessary for random access files.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

IBM 360 OS MVT.
Should run without difficulties also on IBM 370 MVS/SE.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Every module is an overlay segment. A unique load module is used for the whole system.

15. NAME AND ESTABLISHMENT OF AUTHOR

          Roland Ruehle
          Institut fuer Kernenergetik der Universitaet Stuttgart
          7000 Stuttgard-Vaihingen
          Pfaffenwaldring 31, Germany.

File name	File description	Records
NEA0598_01.002	JCL AND SYSTEM IMPLEMENTATION INSTRUCTIONS	572
NEA0598_01.003	SYSTEM SOURCE FOR IEBUPDTE	13532
NEA0598_01.004	PHYSICS SOURCE FOR IEBUPDTE	30331
NEA0598_01.005	INPUT FOR TEST CASE IN IEBUPDTE FORM	8668
NEA0598_01.006	OVERLAY CONTROL CARDS	114
NEA0598_01.007	ABBRAND TEST CASE PRINTED OUTPUT	913
NEA0598_01.008	ABRBIB TEST CASE PRINTED OUTPUT	295
NEA0598_01.009	AKTIV TEST CASE PRINTED OUTPUT	143
NEA0598_01.010	DIFF1D TEST CASE PRINTED OUTPUT	895
NEA0598_01.011	DIFF2D TEST CASE PRINTED OUTPUT	472
NEA0598_01.012	DOQ TEST CASE PRINTED OUTPUT	221
NEA0598_01.013	GAMTHERM TEST CASE PRINTED OUTPUT	156
NEA0598_01.014	GGCMISCH TEST CASE PRINTED OUTPUT	128
NEA0598_01.015	GGCMISC1 TEST CASE PRINTED OUTPUT	322
NEA0598_01.016	GGCMISC2 TEST CASE PRINTED OUTPUT	114
NEA0598_01.017	GRKBAND TEST CASE PRINTED OUTPUT	3421
NEA0598_01.018	GRUGRENZ TEST CASE PRINTED OUTPUT	113
NEA0598_01.019	INTERPOL TEST CASE PRINTED OUTPUT	1182
NEA0598_01.020	ISOSTO TEST CASE PRINTED OUTPUT	810
NEA0598_01.021	KOMBL TEST CASE PRINTED OUTPUT	892
NEA0598_01.022	MATMAN TEST CASE PRINTED OUTPUT	1867
NEA0598_01.023	MITHOM TEST CASE PRINTED OUTPUT	1190
NEA0598_01.024	MITTEL TEST CASE PRINTED OUTPUT	1423
NEA0598_01.025	MIX TEST CASE PRINTED OUTPUT	336
NEA0598_01.026	MIXBI TEST CASE PRINTED OUTPUT	537
NEA0598_01.027	MIXTAB TEST CASE PRINTED OUTPUT	144
NEA0598_01.028	MST TEST CASE PRINTED OUTPUT	159
NEA0598_01.029	NGAMMA TEST CASE PRINTED OUTPUT	760
NEA0598_01.030	NRAPPROX TEST CASE PRINTED OUTPUT	157
NEA0598_01.031	PLOTH TEST CASE PRINTED OUTPUT	1182
NEA0598_01.032	PRINT TEST CASE PRINTED OUTPUT	692
NEA0598_01.033	RESPU TEST CASE PRINTED OUTPUT	748
NEA0598_01.034	RSYBLOC TEST CASE PRINTED OUTPUT	636
NEA0598_01.035	RSYCAL TEST CASE PRINTED OUTPUT	154
NEA0598_01.036	SN1D TEST CASE PRINTED OUTPUT	4244
NEA0598_01.037	SPEKTRM1 TEST CASE PRINTED OUTPUT	380
NEA0598_01.038	SPEKTRUM TEST CASE PRINTED OUTPUT	380
NEA0598_01.039	SPEKTRUS TEST CASE PRINTED OUTPUT	1558
NEA0598_01.040	WQGAS TEST CASE PRINTED OUTPUT	282
NEA0598_01.041	WQGAS1 TEST CASE PRINTED OUTPUT	464
NEA0598_01.042	WQPACK TEST CASE PRINTED OUTPUT	163
NEA0598_01.043	WQS TEST CASE PRINTED OUTPUT	3334
NEA0598_01.044	THERM. LIB 1 DCB=(RECFM=V,BLKSIZE=19068)	43
NEA0598_01.045	THERM. LIB 2 DCB=(RECFM=V,BLKSIZE=19068)	47
NEA0598_01.046	THERM. LIB 3 DCB=(RECFM=V,BLKSIZE=19068)	43
NEA0598_01.047	GGC LIB DCB=(RECFM=V,BLKSIZE=3520)	1185