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Latest News
NRC updating GEIS rule for new nuclear technology
The Nuclear Regulatory Agency is issuing a proposed generic environmental impact statement (GEIS) for use in reviewing applications for new nuclear reactors.
In an April 17 memo, NRC secretary Carrie Safford wrote that the commission approved NRC staff’s recommendation to publish in the Federal Register a proposed rule amending 10 CFR Part 51, “Environmental Protection Regulations for Domestic Licensing and Related Regulatory Functions.”
J. Kißlinger, T. Andreeva
Fusion Science and Technology | Volume 50 | Number 3 | October 2006 | Pages 382-386
Technical Paper | Stellarators | doi.org/10.13182/FST06-A1259
Articles are hosted by Taylor and Francis Online.
The superconducting magnet system of Wendelstein 7-X (W7-X) consists of five identical field periods (modules). Magnetic field errors arise if the modules are not exactly identical. Even small deviations in the coil shapes of the same type or misalignments of coils or modules break the periodicity of the system and cause error field components.Simulation of the magnetic field perturbations that are expected has been done by the analysis of existing winding packages and statistical extrapolations of inaccuracies expected during assembly steps. A numerical experiment has shown that assembly errors should contribute significantly more than manufacturing errors of individual coils.Compensation of the magnetic field perturbation can be done with the help of the coil adjustment during the assembly or by the individual adjustment of all five modules. Further compensation of field errors is possible with additional coils. The existing control coils in W7-X can be used for error field compensation; however, their efficacy is limited. Therefore, solutions employing normal-conducting trim coils outside the cryostat vessel are also considered here.