Arguments for tightness testing of nuclear system pipeline parts, attached to pressureless tanks

¹ Peter the Great St.Petersburg Polytechnic University, Polytechnicheskaya 29, St. Petersburg, 195251, Russian Federation
² Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, Moscow, 117198, Russian Federation
³ Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi pr. VO 31, St. Petersburg, 199004, Russian Federation
⁴ Saint-Petersburg National Research University of Information Technologies, Mechanics, and Optics, Kronverkskii pr. 49, 197101 St. Petersburg, Russian Federation

^* Corresponding author: mikhail.yu.egorov@gmail.com

Abstract

Actual standard, namely Rules for design and safe operation of equipment and pipelines of nuclear power installations (2015) does not regulate strength and tightness testing of pipeline parts, located between valves and pressureless tanks of nuclear systems at nuclear power plants. This paper introduces arguments for strength and tightness test conduction of such areas of nuclear power plant pipelines, designed in accordance with Russian standards. It was also proposed some amendments for the norm aimed to improve safety and reliability of nuclear power plant systems with radioactive contamination. It was suggested to apply the result of current study to Leningradskaya-2 in order to improve safety and decrease the number of failures of the liquid radioactive waste storage system.