Treatment of the upper cavity in a pebble-bed high-temperature gas-cooled reactor by diffusion theory

Journal Article · Tue Sep 01 00:00:00 EDT 1987 · Nucl. Sci. Eng.; (United States)

OSTI ID:5011607

Gerwin, H; Scherer, W

A simple method has been developed for treating large cylindrical empty and rodded void regions in high-temperature gas-cooled reactors with each existing diffusion code. The cavity is treated as a diffusion region with zero reaction cross sections. Only diffusion constants, found by an optimization process, are used. Verification of this model is done by comparing results with transport solutions for identical problems. Very good agreement is attained when anisotropic diffusion is foreseen in the diffusion code. Even with isotropic diffusion, however, eigenvalues and rod reactivities proved to be acceptable. This treatment yields usual diffusion running times and allows three-dimensional calculations.

• Research Organization: Institut fur Reaktorentwicklung, Kernforschungsanlage Julich GmbH, Postfach 1913, D-5170 Julich (DE)
• OSTI ID: 5011607
• Journal Information: Nucl. Sci. Eng.; (United States), Vol. 97:1
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
HTGR TYPE REACTORS
COMPUTER CODES
PERFORMANCE TESTING
REACTOR CORES
DIFFUSION
CALCULATION METHODS
CROSS SECTIONS
EIGENVALUES
MATHEMATICAL MODELS
OPTIMIZATION
THREE-DIMENSIONAL CALCULATIONS
GAS COOLED REACTORS
GRAPHITE MODERATED REACTORS
REACTOR COMPONENTS
REACTORS
TESTING
220400* - Nuclear Reactor Technology- Control Systems
210400 - Power Reactors
Nonbreeding
Otherwise Moderated or Unmoderated
220100 - Nuclear Reactor Technology- Theory & Calculation