The financial support by National Natural Science Foundation of China (71371070, 71071051, 71301069, 51674145, 71501068) and Scientific Research Program supported by Lingdong Nuclear Power Plant (KR70543), China, the construct program of the key discipline in Hunan province and Innovation Ability Construction Projects based on the new Industry-Academy-Research Cooperation of Hunan Province (2012GK4101), China, the Construct Program of the Key Discipline in Hunan Province (USC2016), China, the Postdoctoral Science Foundation of China (2016M600633), the Humanities and Social Science Foundation of Ministry of Education (11YJC630207), China, and the Social Science Foundation of Hunan Province (2016G025), China, are gratefully acknowledged. We would like to express gratitude to the staff in two Chinese nuclear power plants (Qinshan Phase 3 and Lingdong) for the interviews and investigations which facilitate the research included in this paper. The anonymous reviewers and the editor of this paper are also gratefully acknowledged for their constructive comments and suggestions.