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Innovative Energy Planning and Nuclear Option Using CANDLE Reactors

Abstract

A new reactor burn-up strategy CANDLE (Constant Axial shape of Neutron flux, nuclide densities and power shape During Life of Energy producing reactor) was proposed, where shapes of neutron flux, nuclide densities and power density distributions remain constant but move upward (or downward) along its core axis. This burn-up strategy can derive many merits. The change of excess reactivity along burn-up is theoretically zero for ideal equilibrium condition, and shim rods will not be required for this reactor. The reactor becomes free from accidents induced by unexpected control rods withdrawal. The core characteristics, such as power feedback coefficients and power peaking factor, are not changed during life of operation. Therefore, the operation of the reactor becomes much easier than the conventional reactors. The infinite-medium neutron multiplication factor of replacing fuel is less than unity. Therefore, the transportation and storage of replacing fuels becomes easy and safe, since they are free from criticality accidents. Small long life fast reactor with CANDLE burn-up concept has investigated with depleted uranium as a replacing fuel. Both core diameter and height are chosen to be 2.0 m, and the thermal power is 200 MW. Lead-bismuth is used as a coolant, and nitride (enriched N-15) fuel  More>>
Authors:
Sekimoto, H; Nagata, A; Mingyu, Y [1] 
  1. Tokyo Institute of Technology, Tokyo (Japan)
Publication Date:
Jul 01, 2008
Product Type:
Conference
Report Number:
INIS-HR-08002
Resource Relation:
Conference: 7. International conference on Nuclear Option in Countries with Small and Medium Electricity Grids, Dubrovnik (Croatia), 25-29 May 2008; Related Information: In: Book of Abstracts of 7th International Conference on Nuclear Option in Countries with Small and Medium Electricity Grids, by Cavlina, N.; Pevec, D.; Bajs, T, 132 pages.
Subject:
29 ENERGY PLANNING, POLICY AND ECONOMY; BURNUP; ENERGY POLICY; FUEL MANAGEMENT; NUCLEAR POWER PLANTS; SPENT FUELS
OSTI ID:
21115257
Research Organizations:
Croatian Nuclear Society (Croatia)
Country of Origin:
Croatia
Language:
English
Other Identifying Numbers:
Other: ISBN 978-953-55224-0-9; TRN: HR0800103123019
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
page(s) 15
Announcement Date:
Dec 19, 2008

Citation Formats

Sekimoto, H, Nagata, A, and Mingyu, Y. Innovative Energy Planning and Nuclear Option Using CANDLE Reactors. Croatia: N. p., 2008. Web.
Sekimoto, H, Nagata, A, & Mingyu, Y. Innovative Energy Planning and Nuclear Option Using CANDLE Reactors. Croatia.
Sekimoto, H, Nagata, A, and Mingyu, Y. 2008. "Innovative Energy Planning and Nuclear Option Using CANDLE Reactors." Croatia.
@misc{etde_21115257,
title = {Innovative Energy Planning and Nuclear Option Using CANDLE Reactors}
author = {Sekimoto, H, Nagata, A, and Mingyu, Y}
abstractNote = {A new reactor burn-up strategy CANDLE (Constant Axial shape of Neutron flux, nuclide densities and power shape During Life of Energy producing reactor) was proposed, where shapes of neutron flux, nuclide densities and power density distributions remain constant but move upward (or downward) along its core axis. This burn-up strategy can derive many merits. The change of excess reactivity along burn-up is theoretically zero for ideal equilibrium condition, and shim rods will not be required for this reactor. The reactor becomes free from accidents induced by unexpected control rods withdrawal. The core characteristics, such as power feedback coefficients and power peaking factor, are not changed during life of operation. Therefore, the operation of the reactor becomes much easier than the conventional reactors. The infinite-medium neutron multiplication factor of replacing fuel is less than unity. Therefore, the transportation and storage of replacing fuels becomes easy and safe, since they are free from criticality accidents. Small long life fast reactor with CANDLE burn-up concept has investigated with depleted uranium as a replacing fuel. Both core diameter and height are chosen to be 2.0 m, and the thermal power is 200 MW. Lead-bismuth is used as a coolant, and nitride (enriched N-15) fuel are employed. The velocity of burning region along burn-up is less than 1.0 cm/year that enables a long life design easily. The core averaged discharged fuel burn-up is about 40 percent. It is about ten times of light water reactor burn-up. The spent fuel volume becomes one-tenth of light water reactor spent fuel. If a light water reactor with a certain power output has been operated for 40 years, the CANDLE reactor can be operated for 2000 years with the same power output and with only depleted uranium left after fuel production for the light water reactor. The system does not need any reprocessing or enrichment. Therefore, the reactor operation becomes very safe, the waste fuel management becomes much easier, and the total system becomes free from nuclear proliferation.(author)}
place = {Croatia}
year = {2008}
month = {Jul}
}