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Nuclear new build procurement considerations
It may seem counterintuitive, but the best time to enhance the ability to support operations and maintenance for a new plant is before construction starts. This is one of many lessons learned by the currently operating nuclear fleet. As construction and startup of many nuclear facilities was completed, it quickly became evident that the ability to efficiently support operations and maintenance was limited. Most of the information necessary to establish and manage procurement of spare and replacement items, maintenance, and configuration of the facilities was unavailable and had to be gathered on a case-by-case, “on-demand” basis. Absence of necessary information and the associated challenges resulted in the need for staff augmentation and multiyear-long projects to develop equipment bills of material and maintenance programs and to perform technical evaluations for the huge quantities of spare and replacement items being requested.
Li-Xian Fang, Dong-Shan Zhao, Tian-Tian Ji, Fu Zeng, Wei Zhang
Nuclear Technology | Volume 193 | Number 2 | February 2016 | Pages 276-286
Technical Paper | doi.org/10.13182/NT15-12
Articles are hosted by Taylor and Francis Online.
Localization of loose parts is a crucial technique of a loose parts monitoring system for nuclear power plants. Accurate localization is beneficial for fault diagnosis and the continuous tracking of loose parts. Combined with time-frequency signal-processing methods, this paper presents a loose parts localization delay calculation method based on the continuous wavelet transform (CWT) and Hilbert envelope. First, it is identified that the signal is processed by CWT; second, the arrival time of the signal is determined by the Hilbert envelope method; and third, the grid localization method is applied to realize localization. This method, which uses the main frequency band of the impact signal as the Hilbert envelope localization signal, can minimize the effect of changes in the group velocity on time delay, and the Hilbert transform can obtain more accurate time delays. The experimental results show that this loose parts localization delay calculation based on the CWT and Hilbert envelope method has strong anti-interference capacity and high locating precision.