US 12,405,208 B2
Method for screening the optimal zinc ion concentration of a primary loop during a thermal state function test of a nuclear power plant
Tao Hou, Taizhou (CN); Xuechao Nie, Taizhou (CN); Shunlong Yang, Taizhou (CN); Lei Jiang, Taizhou (CN); Xianbo Meng, Taizhou (CN); Xudong Wu, Taizhou (CN); Jianhua Cheng, Taizhou (CN); and Yinqiang Chen, Taizhou (CN)
Assigned to SANMEN NUCLEAR POWER CO., LTD., Taizhou (CN)
Filed by Sanmen Nuclear Power Co., Ltd., Taizhou (CN)
Filed on Nov. 15, 2023, as Appl. No. 18/510,552.
Application 18/510,552 is a continuation of application No. PCT/CN2023/077865, filed on Feb. 23, 2023.
Claims priority of application No. 202211068570.5 (CN), filed on Sep. 2, 2022.
Prior Publication US 2024/0183774 A1, Jun. 6, 2024
Int. Cl. G01N 17/02 (2006.01); G01N 1/28 (2006.01); G01N 1/32 (2006.01); G01N 1/34 (2006.01); G01N 17/00 (2006.01); G01N 23/2251 (2018.01)
CPC G01N 17/02 (2013.01) [G01N 1/286 (2013.01); G01N 1/32 (2013.01); G01N 1/34 (2013.01); G01N 17/002 (2013.01); G01N 23/2251 (2013.01); G01N 2001/2866 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A screening method for an optimal zinc ion concentration in the primary loop during a hot functional test of a nuclear power plant, wherein the method includes the steps of:
maintaining an autoclave containing a test specimen in a hot functional test environment;
adding a zinc salt to the autoclave until the zinc ion concentration is in a range of 20 ppb to 250 ppb, and performing a film-forming test;
upon completion of the film-forming test, taking out the test specimen, performing an electrochemical impedance test on the test specimen, plotting an electrochemical impedance trend chart of the test specimen over different zinc ion concentrations based on the electrochemical impedance test results, and screening the zinc ion concentration range corresponding to impedance values less than 1.085*105 ohm based on the electrochemical impedance trend chart.