The ANENT Webinar Series 2023 No. 1 entitled "Computer Security of Nuclear Power Plants" was conducted last May 30, 2023, through MS Teams. The resource speaker is Dr. Jianghai LI. He discussed the following topics including (1) Computer Security Risks in Nuclear Power Plants; (2) Special aspects of computer security issues; and (3) Tsinghua/INET's work on the issue.