A nodal expansion method with spatially coupled effects incorporated into the transverse leakage approximation
- Korea Advanced Energy Research Inst., Daeduk (Republic of Korea)
The behavior of neutron leakages between nodes is in general spatially coupled and environment dependent. To investigate this phenomenon, a new transverse leakage model characterized by the space-dependent neutron flux expanded into spatially nonseparable polynomials has been developed. The new transverse leakage model incorporated into the nodal expansion method was tested for its accuracy and applicability by performing benchmark problems and applied to a realistic pressurized water reactor core, beginning of cycle 1 of Korea Nuclear Unit 1. The results obtained for homogeneous nodal problems with the explicit representation of the baffle and water reflector show that the new method improves the reactor core physics parameters, and that it improves the nodal power distribution of the conventional models more than a factor of 2, especially in the fuel regions next to the core baffle where the material discontinuity is predominant due to the significant difference in the neutron spectrum.
- OSTI ID:
- 6923717
- Journal Information:
- Nuclear Science and Engineering; (USA), Journal Name: Nuclear Science and Engineering; (USA) Vol. 103:4; ISSN 0029-5639; ISSN NSENA
- Country of Publication:
- United States
- Language:
- English
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210200* -- Power Reactors
Nonbreeding
Light-Water Moderated
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BENCHMARKS
FUEL ASSEMBLIES
FUNCTIONS
KINETICS
NEUTRON LEAKAGE
NEUTRON REFLECTORS
POLYNOMIALS
PWR TYPE REACTORS
REACTOR COMPONENTS
REACTOR CORES
REACTOR KINETICS
REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS