Reevaluation of spatial weighting factors for ex-core neutron detectors

Journal Article · Sun Aug 01 00:00:00 EDT 1982 · Nucl. Technol.; (United States)

OSTI ID:5934379

Hiroshi, T; Eiji, O; Tadashi, H

The ex-core detector response of the PWR core is calculated using the two-dimensional transport code. The following conclusions are obtained: The neutron scattering effect outside of the reactor vessel is rather big in the detector response calculation. When the authors calculate the assembly-wise weighting factors for the detector response using the two-dimensional transport code, the weighting factors of the peripheral assemblies not close to the detector but close to the reactor vessel become big. When the authors calculate the detector response during the one rod insertion test of the typical three-loop PWR core using the above weighting factors, the agreement between calculation and measurement is very good. In the case of the simple point kernel calculational method widely used instead of the two-dimensional transport method, the authors obtain nearly the same result by correcting the method with the fractional angle seeing the detector from the reactor vessel outside surface.

• Research Organization: Mitsubishi Atomic Power Industries, Inc., Nihonjishodaini Building, 1-2-1, Taito, Taito-ku, Tokyo
• OSTI ID: 5934379
• Journal Information: Nucl. Technol.; (United States), Vol. 58:2
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
NEUTRON DETECTORS
TWO-DIMENSIONAL CALCULATIONS
PWR TYPE REACTORS
REACTOR CORES
REACTOR VESSELS
SCATTERING
TRANSPORT THEORY
WEIGHT INDICATORS
CONTAINERS
MEASURING INSTRUMENTS
RADIATION DETECTORS
REACTOR COMPONENTS
REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210200* - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled