NESC0734 MARCH2.
MARCH, Containment Behaviour after LOCA, Blowdown, Meltdown, Metal H2O Reaction
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 |
|---|---|---|---|
| MARCH-2 | NESC0734/04 | Tested | 04-JUN-1985 |
| MARCH-2 | NESC0734/05 | Tested | 26-FEB-1993 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NESC0734/04 | CDC CYBER 180 | CDC CYBER 740 |
| NESC0734/05 | CDC CYBER 180 | DEC VAX 6000 |
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4. METHOD OF SOLUTION
Models are included to perform calculations from the start of an accident through the stages of blowdown, boiloff, core heat up, core meltdown, pressure vessel bottom head melting and failure, debris-water interaction in the reactor cavity, and the interaction of the molten debris with the concrete containment base pad. The mass and energy additions into the containment building during this accident scenario are continuously evaluated, and the pressure-temperature response of the containment is calculated either with or without the engineered safety features. The analysis accounts for metal-water reactions, combustion of hydrogen, and heat losses to structures in the containment.
Models are included to perform calculations from the start of an accident through the stages of blowdown, boiloff, core heat up, core meltdown, pressure vessel bottom head melting and failure, debris-water interaction in the reactor cavity, and the interaction of the molten debris with the concrete containment base pad. The mass and energy additions into the containment building during this accident scenario are continuously evaluated, and the pressure-temperature response of the containment is calculated either with or without the engineered safety features. The analysis accounts for metal-water reactions, combustion of hydrogen, and heat losses to structures in the containment.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
Application is limited to typical LWR systems. The containment can be divided into up to 8 interconnected compartment volumes. Engineered safety features which can be modeled include ECCS, containment sprays, containment building coolers, containment fans, PWR ice condensers, BWR pressure suppression pools, and ECC and containment spray recirculation heat exchangers. The reactor core can be modeled by up to 10 radial and up to 50 axial nodes. Containment structures can be modeled by up to 15 slabs consisting of up to 2 materials each.
Application is limited to typical LWR systems. The containment can be divided into up to 8 interconnected compartment volumes. Engineered safety features which can be modeled include ECCS, containment sprays, containment building coolers, containment fans, PWR ice condensers, BWR pressure suppression pools, and ECC and containment spray recirculation heat exchangers. The reactor core can be modeled by up to 10 radial and up to 50 axial nodes. Containment structures can be modeled by up to 15 slabs consisting of up to 2 materials each.
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6. TYPICAL RUNNING TIME
Computer running time is highly problem dependent. Representative problems may require on the order of 100 seconds of central processor time on the CYBER176; corresponding times on the CYBER180-855 and CYBER180-815 would be 200 and 2000 seconds, respectively. NESC executed the longest running sample problem in approximately 470 CP seconds on a CDC CYBER175.
Computer running time is highly problem dependent. Representative problems may require on the order of 100 seconds of central processor time on the CYBER176; corresponding times on the CYBER180-855 and CYBER180-815 would be 200 and 2000 seconds, respectively. NESC executed the longest running sample problem in approximately 470 CP seconds on a CDC CYBER175.
NESC0734/04
NEA-DB executed the PWR transient sample problem of the package on CDC CYBER 740 in 1156 seconds of CPU time.NESC0734/05
A typical run on a DEC VAX 6000-510 computer required 4 seconds of CPU time.[ top ]
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8. RELATED AND AUXILIARY PROGRAMS
MARCH2 is an improvement and replacement of the earlier MARCH1.1 code which incorporated modifications of the Battelle Columbus Laboratories BOIL1 program and INTER, originally written as a separate program at Sandia Laboratories, as modules for primary system response and debris- concrete interaction calculations, respectively. The MARCH provides the boundary conditions for the operation of CORRAL2 (NESC Abstract 745).
MARCH2 is an improvement and replacement of the earlier MARCH1.1 code which incorporated modifications of the Battelle Columbus Laboratories BOIL1 program and INTER, originally written as a separate program at Sandia Laboratories, as modules for primary system response and debris- concrete interaction calculations, respectively. The MARCH provides the boundary conditions for the operation of CORRAL2 (NESC Abstract 745).
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| Package ID | Status date | Status |
|---|---|---|
| NESC0734/04 | 04-JUN-1985 | Tested at NEADB |
| NESC0734/05 | 26-FEB-1993 | Tested at NEADB |
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NESC0734/04, included references:
- R.O. Wooton, P. Cybulskis and S.F. Quayle:MARCH-2 (Meltdown Accident Response Characteristics) Code
Description and User's Manual.
NUREG/CR-3988 BMI-2115 (September 1984)
NESC0734/05, included references:
- R.O. Wooton, P. Cybulskis and S.F. Quayle:MARCH-2 (Meltdown Accident Response Characteristics) Code
Description and User's Manual.
NUREG/CR-3988 BMI-2115 (September 1984)
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11. MACHINE REQUIREMENTS
MARCH2 requires approximately 272K (octal) words of memory for execution on a CDC CYBER175.
MARCH2 requires approximately 272K (octal) words of memory for execution on a CDC CYBER175.
NESC0734/04
344,700 (octal) words of CDC CYBER 740 main storage (CM).[ top ]
| Package ID | Computer language |
|---|---|
| NESC0734/04 | FORTRAN-77 |
| NESC0734/05 | FORTRAN-77 |
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED
NOS/BE 1.5-577 and NOS 2.2-605/587 (CYBER180) and NOS 2.2-596/587 (CDC CYBER175).
NOS/BE 1.5-577 and NOS 2.2-605/587 (CYBER180) and NOS 2.2-596/587 (CDC CYBER175).
NESC0734/04
NOS 1.4-531 (CDC CYBER 740).NESC0734/05
VMS V5.4-2 (VAX 6000).[ top ]
14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
All
input data are provided using NAMELIST.
In addition to printed output, MARCH2 produces plot files for graphic programs and data files for input to CORRAL and other fission product transport codes.
The extensions to ANSI FORTRAN 77 are located in the input routine INP and system environment routines CPUSEC, PERROR, and STEPS.
All
input data are provided using NAMELIST.
In addition to printed output, MARCH2 produces plot files for graphic programs and data files for input to CORRAL and other fission product transport codes.
The extensions to ANSI FORTRAN 77 are located in the input routine INP and system environment routines CPUSEC, PERROR, and STEPS.
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NESC0734/04
| File name | File description | Records |
|---|---|---|
| NESC0734_04.003 | INFORMATION FILE | 60 |
| NESC0734_04.004 | MARCH-2 SOURCE PROGRAM (CARD IMAGES) | 23877 |
| NESC0734_04.005 | MARCH-2 SOURCE PROGRAM (IEBUPDTE FORMAT) | 19855 |
| NESC0734_04.006 | MARCH-2 ERROR MESSAGE TEXTS | 85 |
| NESC0734_04.007 | MARCH-2 SAMPLE DEFAULT DATA VALUES | 24 |
| NESC0734_04.008 | MARCH-2 TEST CASE EXEC CONTROL STMTS | 20 |
| NESC0734_04.009 | MARCH-2 PWR TRANSIENT TEST CASE INPUT DATA | 541 |
| NESC0734_04.010 | MARCH-2 ICE CONDENSER TEST CASE INPUT DATA | 537 |
| NESC0734_04.011 | MARCH-2 BWR MARKIII TRANSIENT INPUT DATA | 549 |
| NESC0734_04.012 | MARCH-2 BWR MARII LARGE BREAK LOCA DATA | 211 |
| NESC0734_04.013 | MARCH-2 PWR TRANSIENT TEST CASE OUTPUT | 6068 |
| NESC0734_04.014 | MARCH-2 ICE CONDENSER TEST CASE OUTPUT | 11113 |
| NESC0734_04.015 | MARCH-2 BWR MARKIII TRANSIENT OUTPUT | 14827 |
| NESC0734_04.016 | MARCH-2 BWR MARKII LARGE BREAK LOCA OUTPUT | 9478 |
NESC0734/05
| File name | File description | Records |
|---|---|---|
| NESC0734_05.001 | Information file | 71 |
| NESC0734_05.002 | JCL | 6 |
| NESC0734_05.003 | MARCH2 Version 152 FORTRAN source | 23903 |
| NESC0734_05.004 | Dummy subroutines (VAX version) | 10 |
| NESC0734_05.005 | MARCH2 Version 151 source in CDC UPDATE for. | 19855 |
| NESC0734_05.006 | MARCH2 Vers. 151 to Vers. 152 corr. source | 297 |
| NESC0734_05.007 | MARCH2 error message texts | 85 |
| NESC0734_05.008 | Sample exec. control statements (for CDC ) | 15 |
| NESC0734_05.009 | PWR TRANSIENT S.P.I. 1 (INP.DAT) | 541 |
| NESC0734_05.010 | PWR TRANSIENT S.P.I. 1 (FOR002.DAT) | 540 |
| NESC0734_05.011 | PWR ICE CONDENSER S.P.I. 2 (INP.DAT) | 537 |
| NESC0734_05.012 | PWR ICE CONDENSER S.P.I. 2 (FOR002.DAT) | 536 |
| NESC0734_05.013 | BWR MARKIII TRANSIENT S.P.I. 3 (INP.DAT) | 549 |
| NESC0734_05.014 | BWR MARKIII TRANSIENT S.P.I. 3 (FOR002.DAT) | 548 |
| NESC0734_05.015 | BWR MARKII LARGE etc. S.P.I. 4 (INP.DAT.) | 211 |
| NESC0734_05.016 | BWR MARKII LARGE etc. S.P.I. 4 (FOR002.DAT) | 210 |
| NESC0734_05.017 | PWR TRANSIENT output 1 (FOR012.DAT) | 40 |
| NESC0734_05.018 | PWR TRANSIENT output 1 (OUT.DAT) | 6053 |
| NESC0734_05.019 | PWR ICE CONDENSOR output 2 (FOR012.DAT) | 32 |
| NESC0734_05.020 | PWR ICE CONDENSOR output 2 (OUT.DAT) | 11377 |
| NESC0734_05.021 | BWR MARKIII TRANSIENT output 3 (FOR012.DAT) | 37 |
| NESC0734_05.022 | BWR MARKIII TRANSIENT output 3 (OUT.DAT) | 14352 |
| NESC0734_05.023 | BWR MARKII LARGE etc. output 4 (FOR012.DAT) | 31 |
| NESC0734_05.024 | BWR MARKII LARGE etc. output 4 (OUT.DAT) | 9349 |
Keywords: LWR reactors, accidents, blowdown, containment systems, meltdown, reactor cores, reactor safety.