Computer Programs

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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Program name | Package id | Status | Status date |
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SYNTH-C | NEA-0594/01 | Tested | 01-APR-1980 |

Machines used:

Package ID | Orig. computer | Test computer |
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NEA-0594/01 | IBM 3033 | IBM 3033 |

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3. DESCRIPTION OF PROBLEM OR FUNCTION

SYNTH-C-STEADY and SYNTH-C- TRANS solve respectively the steady-state and time-dependent few- group neutron diffusion equations in three dimensions x,y,z in the presence of fuel temperature and thermal-hydraulic feedback. The neutron diffusion and delayed precursor equations are approximated by a space-time (z,t) synthesis method with axially discontinuous trial functions. Three thermal-hydraulic and fuel heat transfer models are available viz. COBRA-3C/MIT model, lumped parameter (WIGL) model and adiabatic fuel heat-up model.

SYNTH-C-STEADY and SYNTH-C- TRANS solve respectively the steady-state and time-dependent few- group neutron diffusion equations in three dimensions x,y,z in the presence of fuel temperature and thermal-hydraulic feedback. The neutron diffusion and delayed precursor equations are approximated by a space-time (z,t) synthesis method with axially discontinuous trial functions. Three thermal-hydraulic and fuel heat transfer models are available viz. COBRA-3C/MIT model, lumped parameter (WIGL) model and adiabatic fuel heat-up model.

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4. METHOD OF SOLUTION

The steady-state and time-dependent synthesis equations are solved respectively by the Wielandt's power method and by the theta-difference method (in time), both coupled with a block factorization technique and double precision arithmetic. The thermal-hydraulic model equations are solved by fully implicit fin- ite differences (WIGL) or explicit-implicit difference techniques with iterations (COBRA-EC/MIT).

The steady-state and time-dependent synthesis equations are solved respectively by the Wielandt's power method and by the theta-difference method (in time), both coupled with a block factorization technique and double precision arithmetic. The thermal-hydraulic model equations are solved by fully implicit fin- ite differences (WIGL) or explicit-implicit difference techniques with iterations (COBRA-EC/MIT).

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7. UNUSUAL FEATURES OF THE PROGRAM

The complexity of the problem that can be dealt with. For example BWR problems with 2 neutron groups, 1 precursor group, 200 planar regions or channels, 10 axial regions, 4 trial functions and up to 100 x 100 x 100 mesh points could be run with a storage requirement of about 1000 K bytes and a still reasonable running time.

The complexity of the problem that can be dealt with. For example BWR problems with 2 neutron groups, 1 precursor group, 200 planar regions or channels, 10 axial regions, 4 trial functions and up to 100 x 100 x 100 mesh points could be run with a storage requirement of about 1000 K bytes and a still reasonable running time.

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8. RELATED AND AUXILIARY PROGRAMS

The SQUID-SYN program, which solves the multigroup neutron diffusion equations in two-dimensions (rec- tangular or cylindrical geometry), can be used to generate trial and weight functions that can be tested for linear independence by the GRAMMA program. The LIBGEN program can be used for further pro- cessing of the library files (collections of trial and weight func- tions) that are to be fed into the SYNTH programs. All of these programs are described in the reference report quoted in item 10.

The SQUID-SYN program, which solves the multigroup neutron diffusion equations in two-dimensions (rec- tangular or cylindrical geometry), can be used to generate trial and weight functions that can be tested for linear independence by the GRAMMA program. The LIBGEN program can be used for further pro- cessing of the library files (collections of trial and weight func- tions) that are to be fed into the SYNTH programs. All of these programs are described in the reference report quoted in item 10.

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NEA-0594/01, included references:

- E. Brega, F. Di Pasquantonio and E. Salina:Three-Dimensional Transient Analysis in Thermal Power Reactors: An

Extensive Comparison Between Finite Difference and Space-Time

Synthesis Methods

Reprint Annals of Nuclear Energy, Vol. 5 pp. 117-132

(Recieved 7 October 1977)

- E. Brega and E. Salina:

SYNTH-C - A Program for the Neutron and Thermal-Hydraulic Dynamic

Analysis of Large Power Reactors in Three Space Dimensions

ENEL-DSR-CRTN N5-19 (December 1979)

- F. Di Pasquantonio, E. Brega and E. Salina:

The SYNTH Code for Three-Dimensional Static and Transient Analysis

of LWR Cores

ENEL-DSR-CRTN N5-22 (April 1980)

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11. MACHINE REQUIREMENTS

About 300,000 bytes are required to store the load module of either SYNTH program. This figure can be con- siderably reduced by a suitable overlay organisation, also indicated in the reference report.

Moreover, a labeled COMMON that can be easily modified to fit the remaining part of the available core storage, contains all of the variables with data-dependent dimensions. Five peripheral storage devices (discs or tapes) are needed, of which one is a library of trial functions and another is for input/output of restart data.

About 300,000 bytes are required to store the load module of either SYNTH program. This figure can be con- siderably reduced by a suitable overlay organisation, also indicated in the reference report.

Moreover, a labeled COMMON that can be easily modified to fit the remaining part of the available core storage, contains all of the variables with data-dependent dimensions. Five peripheral storage devices (discs or tapes) are needed, of which one is a library of trial functions and another is for input/output of restart data.

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NEA-0594/01

File name | File description | Records |
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NEA0594_01.001 | INFORMATION | 17 |

NEA0594_01.002 | SQUID SOURCE | 5151 |

NEA0594_01.003 | SQUID INPUT | 228 |

NEA0594_01.004 | SQUID OUTPUT | 4858 |

NEA0594_01.005 | GRAMMA SOURCE | 952 |

NEA0594_01.006 | GRAMMA INPUT | 6 |

NEA0594_01.007 | GRAMMA OUTPUT | 269 |

NEA0594_01.008 | LIBGEN SOURCE | 726 |

NEA0594_01.009 | LIBGEN INPUT | 10 |

NEA0594_01.010 | LIBGEN OUTPUT | 719 |

NEA0594_01.011 | STEADY SOURCE | 5198 |

NEA0594_01.012 | STEADY INPUT | 177 |

NEA0594_01.013 | STEADY OUTPUT | 1885 |

NEA0594_01.014 | TRANS SOURCE | 6136 |

NEA0594_01.015 | TRANS INPUT | 32 |

NEA0594_01.016 | TRANS OUTPUT | 7999 |

NEA0594_01.017 | ORIGINAL JCL | 148 |

NEA0594_01.018 | NEA JCL | 119 |

NEA0594_01.019 | TITIME SOURCE | 11 |

Keywords: feedback, few-group, heat transfer, hydraulics, neutron diffusion equation, power reactors, space-time, steady-state conditions, synthesis, thermodynamics, three-dimensional, time dependence, x-y-z.