Calculation of the reactivity feedback due to core assembly bowing in LMFBRs
A computational model to calculate the reactivity feedback due to material displacements induced by assembly bowing effects has been developed and embodied in a new code called BOWPERT. While previous bowing feedback models were based on an R-Z representation of the core with user defined worth tables, the BOWPERT model is Hex-Z and requires only unambiguously defined quantities such as cross sections and fluxes. The nonuniformity of the temperature distribution in an LMFBR leads to differential thermal expansion of the walls of the assembly hexcans. These thermal expansion differentials cause the hexcan to distort or bow. Consequentially, the assembly experiences a spatial displacement, thereby resulting in a change in reactivity for the core. Although bowing effects are not expected to be sizable in large heterogeneous LMFBRs, it is important to quantify these effects.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6687939
- Report Number(s):
- CONF-840901-8; ON: DE84011704
- Country of Publication:
- United States
- Language:
- English
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A technique for computing bowing reactivity feedback in LMFBR's
Technique for computing bowing reactivity feedback in LMFBRs
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