NEA-0623 LOCA-MARK-2.
LOCA-MARK-2, Fuel Temperature and Clad Temperature in HWR Steam Generator LOCA
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
[ top ]
[ top ]
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 |
|---|---|---|---|
| LOCA-MARK-2 | NEA-0623/01 | Tested | 01-MAY-1980 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NEA-0623/01 | IBM 3033 | IBM 3033 |
[ top ]
3. DESCRIPTION OF PROBLEM OR FUNCTION
A feature of the Steam Generating Heavy Water Moderated Reactor is the provision of a spray cooling system on which major reliance is placed to limit fuel cladding temperatures during a loss-of-coolant accident.
LOCA-MK-2, which has been written to compute SGHWR fuel temperatures in a loss-of-coolant accident, therefore models conditions in which blowdown cooling is only of marginal interest and where the major sources of heat removal are spray mechanisms and radiation. LOCA-MK-2 models the fine details of the fuel cluster, and zircaloy oxidation and radiation.
A feature of the Steam Generating Heavy Water Moderated Reactor is the provision of a spray cooling system on which major reliance is placed to limit fuel cladding temperatures during a loss-of-coolant accident.
LOCA-MK-2, which has been written to compute SGHWR fuel temperatures in a loss-of-coolant accident, therefore models conditions in which blowdown cooling is only of marginal interest and where the major sources of heat removal are spray mechanisms and radiation. LOCA-MK-2 models the fine details of the fuel cluster, and zircaloy oxidation and radiation.
[ top ]
4. METHOD OF SOLUTION
The code assumes that heat transfer depends entirely on spray mechanisms and radiation. The heat transfer history of an accident is divided into three parts:
- Convective heat transfer, terminated by dryout.
- Low radiative heat transfer.
- Spray cooling of the cluster.
LOCA-MK-2 performs a 1-D transient conduction calculation for a typical pin of each ring; temperature is found as a function of radius from the centre of the fuel.
The solution of the conduction equation is by an implicit method and is therefore stable for all sizes of time steps.
The variation of neutron flux after the accident is determined from the conventional six precursor group single point kinetics equations.
The code assumes that heat transfer depends entirely on spray mechanisms and radiation. The heat transfer history of an accident is divided into three parts:
- Convective heat transfer, terminated by dryout.
- Low radiative heat transfer.
- Spray cooling of the cluster.
LOCA-MK-2 performs a 1-D transient conduction calculation for a typical pin of each ring; temperature is found as a function of radius from the centre of the fuel.
The solution of the conduction equation is by an implicit method and is therefore stable for all sizes of time steps.
The variation of neutron flux after the accident is determined from the conventional six precursor group single point kinetics equations.
[ top ]
[ top ]
[ top ]
[ top ]
[ top ]
[ top ]
[ top ]
[ top ]
[ top ]
[ top ]
NEA-0623/01
| File name | File description | Records |
|---|---|---|
| NEA0623_01.001 | INFORMATION FILE | 12 |
| NEA0623_01.002 | SOURCE | 782 |
| NEA0623_01.003 | INPUT DATA AND JCL | 13 |
| NEA0623_01.004 | S.P.OUTPUT | 947 |
[ top ]
- G. Radiological Safety, Hazard and Accident Analysis
- H. Heat Transfer and Fluid Flow
Keywords: cladding, fuel element clusters, fuels, heat transfer, heavy water moderated reactors, loss-of-coolant accident, reactor safety, sprays, temperature, zircaloy.