Preliminary Control Rod Life Time Considerations for the Versatile Test Reactor
- Argonne National Lab., Idaho Falls, ID (United States)
The Versatile Test Reactor (VTR) is a fast spectrum test reactor currently being developed under the direction of the US Department of Energy, Office of Nuclear Energy. VTR will use two independent reactivity control systems: a primary and a secondary reactivity control system. Boron carbide (B4C) is the favored absorber material due to the extensive domestic and international experience. The life limit of control rod is analyzed in this report, based on the depletion of B-10, diametral swelling of B4C pellet and pressure buildup in the gas plenum. Depletion analysis of the absorber material was performed using MCNP6. It is was shown that both the concentration of B-10 and the CR reactivity worth are about linear with the irradiation time. In the preliminary VTR design, natural boron is considered as absorber material and was determined to provide just enough reactivity worth. Several alternate design options were also analyzed to improve the control rods worth (i.e. increase the shutdown reactivity margin). Using enriched boron as absorber material could increase the control rods worth, while having several drawbacks, such as reduced core excess reactivity, shorter lifetime, and larger peak centerline temperatures. A mitigation strategy to using enriched boron is to use both natural and enriched boron in the control rod, with the natural boron in the lower region of the pins and the enriched boron in the upper region. This design option still allows increasing the CR reactivity worth significantly, while maintaining all the advantages of natural boron.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1899893
- Report Number(s):
- ANL-VTR-11; 150841
- Country of Publication:
- United States
- Language:
- English
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