NEA-1485 PREP-45

1. NAME OR DESIGNATION OF PROGRAM:  PREP-45

3. DESCRIPTION OF PROGRAM OR FUNCTION

A Fortran program has been created, which saves much effort in preparing sections 004 (intervals in the coordinates) and 005 (zone numbers) of the input data file for the multigroup theory code CITATION (version CITATION-2, NESC0387/09), particularly when a thin complicated mesh  is used.

4. METHOD OF SOLUTION

A domain is defined for CITATION calculations through specifying its subdomains (e.g. graphite, lead, beryllium, water and fuel subdomains) in a compact and simple way. An independent and previous geometrical specification is made of the various types of elements which are envisaged to constitute the contents of the reactor core grid positions. Then the load table for the configuration is input and scanned throughout, thus enabling the geometric mesh description to be produced (section 004). Also the zone placement (section 005) is achieved by means of element description subroutines for the different types of element (which may require appropriate but simple changes in the actual cases).
The output of PREP45 is directly obtained in a format which is compatible with CITATION-2 input.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Only rectangular two-dimensional Cartesian coordinates are considered. A maximum of 12 subdomains in the x direction (18 in the y direction) and up to 8 distinct element types are considered in this version. Other limitations exist which can nevertheless be overcome with simple changes in the source program.

6. TYPICAL RUNNING TIME

Each sample case takes less than 10 CPU seconds, on the MICROVAX II.

7. UNUSUAL FEATURES OF THE PROGRAM

The present (unchanged) version of the program is applicable to swimming pool research reactors with fuel elements of the MTR type and using (possibly) certain types of  reflector blocks.

8. RELATED AND AUXILIARY PROGRAMS

The results of this program fit the format required for sections 004 and 005 of the input for CITATION-2 (NESC0387/09).

10. REFERENCES:

- C.A.Ramalho Carlos:
  Computer Prorgram "PREP45"
  ITN/DEEN-R-95/38 (January 1995)
- Letter from C.R. Carlos
  Ref. NEA : 95/L/0835 of 19 June, 1995

11. MACHINE REQUIREMENTS

Computer: MICROVAX II; Storage requirements: Less than 300,000 32-bit words of core memory. Most of the core storage requirement (~75%) arises from the integer array NZON used by DEFNZO (to store the zone numbers for section 005).

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  VMS V5.5-2; IBM-compatible PC running under LINUX.6.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Subprograms structure:
                       PREP-45
                          |
    -------------------------------------------
    |                                         |
SECT004                                    DEFNZO
    |                                         |
------      -----------------------------------------------
|    |      |       |       |     |    |    |    |    |   |
N ORDCRE  NORMAL CONTROE CONTROI BER BE40 BE4P BE4Q BE4R WATER

15. NAME AND ESTABLISHMENT OF AUTHORS

C.A. Ramalho Carlos
DEEN/ITN/MPAT - Estrada Nacional n: 10
2685 Sacavem PORTUGAL

File name	File description	Records
NEA1485_01.001	Information file	45
NEA1485_01.002	Report ITN/DEEN-R-95/38 (Word-6.0)	0
NEA1485_01.003	Author's comments (ASCII)	688
NEA1485_01.004	Author's hints for input prep.(ASCII)	189
NEA1485_01.005	PREP-45 source program (FORTRAN-77)	1311
NEA1485_01.006	Sample problem 1 input data	74
NEA1485_01.007	Sample problem 2 input data	74
NEA1485_01.008	Sample problem 3 input data	74
NEA1485_01.009	Sample problem 1 card-image output	186
NEA1485_01.010	Sample problem 2 card-image output	186
NEA1485_01.011	Sample problem 3 card-image output	179
NEA1485_01.012	Sample problem 1 control output	88
NEA1485_01.013	Sample problem 2 control output	88
NEA1485_01.014	Sample problem 3 control output	88
NEA1485_01.015	VMS command proc. for compile/link/go	6