[1] Shangguan Zhihong, Huang Yanjun, Tao Yunliang, . Radiological environmental impact assessment for tritium discharged from inland NPPs[J]. Radiation Protection, 32, 65-71(2012).

[2] Peterson H T, Baker D A. Tritium production, releases and population doses at nuclear power reactors[J]. Fusion Technology, 8, 2544-2550(1985).

[3] Su Genghua, Bao Pengfei, Han Song. Calculation and verification of secondary neutron source intensity of nuclear reactor[J]. High Power Laser and Particle Beams, 29, 036023(2017).

[4] Andrieu C, Ravel S, Ducros G, et al. Release of fission tritium through Zircaloy-4 fuel cladding tubes[J]. Journal of Nuclear Materials, 347, 12-19(2005).

[5] Fu Pengtao, Dai Mingliang, Zhu Zhaowen, . Study of annual tritium discharge in pressurized water reactor based on historical data[J]. High Power Laser and Particle Beams, 34, 026009(2022).

[6] Yang Zhaolin, Wang Liang, Zhou Yonghai, . Calculation and verification of tritium release for PWR nuclear power plants[J]. Nuclear Science and Engineering, 40, 359-366(2020).

[7] [7] Kong Liang. Study on cancelling secondary source assemblies during refuling cycles[D]. Shanghai: Shanghai Jiao Tong University, 2018: 2029

[8] [8] lier A, Gubel P, Venberg C, et al. Experimental study of the tritium inventy in the BR3 extrapolation to a P.W.R. of 900 MWe[R]. Luxembourg: Commission of the European Communities, 1982.

[9] Burns K, Love E, Elmore M. Tritium production in secondary neutron sources in pressurized water reactors[J]. Fusion Science and Technology, 71, 544-548(2017).

[10] [10] Shaver M W, Lanning D D. Secondary startup neutron sources as a source of tritium in a pressurized water react (PWR) react coolant system[R]. Richl: Pacific Nthwest National Lab. , 2010.

[11] [11] IAEA. Power react infmation system (PRIS)[EBOL]. 2022 [20231019]. https:www.iaea.gresourcesdatabasespowerreactinfmationsystempris.

[12] [12] U. S. NRC. Radioactive effluent environmental repts[EBOL]. 2022 [20231019]. https:iseapps.au.govEffluentReptsCommonYearSiteRepts.

[13] Austin J H, Elleman T S, Verghese K. Surface effects on the diffusion of tritium in 304-stainless steel and zircaloy-2[J]. Journal of Nuclear Materials, 48, 307-316(1973).

[14] Kearns J J. Terminal solubility and partitioning of hydrogen in the alpha phase of zirconium, Zircaloy-2 and Zircaloy-4[J]. Journal of Nuclear Materials, 22, 292-303(1967).

[15] [15] rieu C. Étude de la perméation du tritium à travers les gaines de crayons combustibles type R. E. P[D]. Grenoble: Grenoble INPG, 1998.

[16] [16] GB 62492011, Regulations f environmental radiation protection of nuclear power plant[S