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ESTS0063 FAMREC.

FAMREC, PWR Lateral Mechanical Fuel Rod Assembly Response

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1. NAME OR DESIGNATION OF PROGRAM:  FAMREC.
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2. COMPUTERS
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Program name Package id Status Status date
FAMREC ESTS0063/01 Tested 27-DEC-1995

Machines used:

Package ID Orig. computer Test computer
ESTS0063/01 CDC 7600 DEC VAX 6000
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3. DESCRIPTION OF PROGRAM OR FUNCTION

The Fuel Assembly Mechanical REsponse Code (FAMREC) calculates the lateral mechanical response of a row of fuel assemblies while allowing for two types of nonlinearities. The first type is a geometric nonlinearity in the form of gaps between individual assemblies and between peripheral assemblies and a boundary wall. Impacting is monitored across the gaps. The second nonlinearity is the permanent deformation of the fuel assembly spacer grid to compressive loading.
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4. METHOD OF SOLUTION

The response is calculated in the modal plane.  The coupled differential equations are solved in closed form using Laplace transformations. The discrete displacements and velocities are then calculated and the gaps in the system monitored at each axial elevation for impacting. These impact forces are then applied  statistically at a given time-step, and equilibrium is found using a Gaussian elimination technique.
Three impact force calculation methods are available: 1- a linear impact force and crushing load audit calculation, 2- a more detailed linear impact force and crushing load calculation, and 3- a
non-linear grid calculation which allows for plastic deformation of  the fuel assembly spacer grids.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
  3601 time-steps and forces
    80 modes
    30 applied forces
    15 fuel assemblies and
     5 impact grids per assembly
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6. TYPICAL RUNNING TIME

Running time is not only problem dependent, but also dependent on which of the three available impact calculation procedures is selected. NESC executed the sample problem in 54 CP seconds on a CDC7600.
ESTS0063/01
NEA-DB ran the test cases included in this package on a DEC VAX 6000-510 computer. Elapsed times for the six cases varied between 53 sec (case 1) and 270 sec (case 6).
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7. UNUSUAL FEATURES OF THE PROGRAM

FAMREC was generated as an audit tool including three different methods for calculating impact forces to allow three levels of estimation.
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8. RELATED AND AUXILIARY PROGRAMS

Several of the subroutines in FAMREC are taken from the FORTRAN Matrix Analysis library (FORMA) developed at the Martin Marietta Corporation, Denver Division. The program uses the INEL-IGS graphics software for film-recorder plotting; the INEL-IGS routines are not part of this package.
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9. STATUS
Package ID Status date Status
ESTS0063/01 27-DEC-1995 Tested at NEADB
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10. REFERENCES

- INEL-IGS:
  Idaho National Engineering Laboratory, Integrated Graphics System
  Programming Guide
  Aerojet Nuclear Company Computer Science Center (March 1976).
- R.L. Wohlen:
  Synthesis of Dynamic Systems Using FORMA-FORTRAN Matrix Analysis
  Martin Marietta Corporation report MCR-71-75 (May 1971).
ESTS0063/01, included references:
- R.L. Grubb:
  Pressurized Water Reactor Lateral Core Response Routine, FAMREC
  (Fuel Assembly Mechanical Response Code)
  NUREG/CR-1019 R3 (September 1979).
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11. MACHINE REQUIREMENTS

134,000 (octal) words of small core memory (SCM) and 166,000 (octal) words of large core memory (LCM) are required to execute the program.
ESTS0063/01
The package was tested by NEA-DB on a DEC VAX 6000-510  computer.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
ESTS0063/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
ESTS0063/01
The program was tested under VAX/VMS 6.1. The source code was compiled with the DEC FORTRAN compiler version 6.2.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

NESC
supplied dummy routines for the missing INEL-IGS routines: EXITG, GRIDG, LABELG, LEGNDG, MODESG, MLTPLG, NUMBRG, OBJCTG, PAGEG, SEGMTG, SETSMG, SUBJEG, and TITLEG. Suitable alternative routines should be supplied for the computing environment in which the program is to be implementated to obtain graphical output.
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15. NAME AND ESTABLISHMENT OF AUTHORS

           R.C. Guenzler
       EG and G Idaho INC.
       Idaho Falls, ID (United States)
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16. MATERIAL AVAILABLE
ESTS0063/01
File name File description Records
ESTS0063_01.001 information file 463
ESTS0063_01.002 FAMREC FORTRAN source file 3215
ESTS0063_01.003 command file to compile and link FAMREC 10
ESTS0063_01.004 command file to run FAMREC 23
ESTS0063_01.005 input file - case #1 2790
ESTS0063_01.006 input file - case #2 2790
ESTS0063_01.007 input file - case #3 2790
ESTS0063_01.008 input file - case #4 2790
ESTS0063_01.009 input file - case #5 2825
ESTS0063_01.010 input file - case #6 2790
ESTS0063_01.011 output file - case #1 9579
ESTS0063_01.012 output file - case #2 9585
ESTS0063_01.013 output file - case #3 10023
ESTS0063_01.014 output file - case #4 9885
ESTS0063_01.015 output file - case #5 10220
ESTS0063_01.016 output file - case #6 10185
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17. CATEGORIES
  • I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: deformation, fuel assemblies, loss-of-coolant accident, pwr reactors, response functions.