last modified: 26-FEB-1993 | catalog | categories | new | search |

NESC0734 MARCH2.

MARCH, Containment Behaviour after LOCA, Blowdown, Meltdown, Metal H2O Reaction

top ]
1. NAME OR DESIGNATION OF PROGRAM:  MARCH2.
top ]
2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
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
top ]
3. DESCRIPTION OF PROBLEM OR FUNCTION

MARCH2 describes the response of water cooled reactors to severe accidents, including consideration of the primary coolant system as well as the containment.
top ]
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.
top ]
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.
top ]
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.
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 ]
7. UNUSUAL FEATURES OF THE PROGRAM

MARCH2 analyzes severe accident phenomena from initiation through various stages of accident progression.
top ]
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).
top ]
9. STATUS
Package ID Status date Status
NESC0734/04 04-JUN-1985 Tested at NEADB
NESC0734/05 26-FEB-1993 Tested at NEADB
top ]
10. REFERENCES:
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)
top ]
11. MACHINE REQUIREMENTS

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 ]
12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0734/04 FORTRAN-77
NESC0734/05 FORTRAN-77
top ]
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).
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.
top ]
15. NAME AND ESTABLISHMENT OF AUTHOR

Contributed by:
R.O. Wooton
Columbus Laboratories
Battelle
505 King Avenue
Columbus, Ohio 43201
top ]
16. MATERIAL AVAILABLE
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
top ]
17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: LWR reactors, accidents, blowdown, containment systems, meltdown, reactor cores, reactor safety.