A steam or gas pressurizer effect on the system pressure characteristics for an integral pressurized water reactor. (May 2018)

• Record Type: Journal Article
• Authors: Chung, Young-Jong; Yang, Soo-Hyong; Bae, Kyoo-Hwan
• Is Part Of: Annals of nuclear energy. Volume 115(2018)
• Page Start: 249
• Page End: 255
• Publication Date: 2018-05
• Subjects: Gas pressurizer -- Steam pressurizer -- Integral type pressurized water reactor -- SMART -- VISTA-ITL facility; Nuclear energy -- Periodicals; Nuclear engineering -- Periodicals; 621.4805
• DOI: 10.1016/j.anucene.2018.01.036
• Languages: English
• ISSNs: 0306-4549

Abstract

Highlights: Pressurizer is a major component to control a system pressure of the PWR. System pressure characteristics on nitrogen gas-water and steam-water pressurizers. Pressurization at the steam pressurizer is lower than that of the gas pressurizer. Depressurization for the long-term cooling depends on a decay heat level. Abstract: A pressurizer is a major component used to control a system pressure in a primary coolant system of a pressurized water reactor. To identify the system pressure characteristics on nitrogen gas-water and steam-water pressurizers for an integral pressurizer water reactor, an experimental study is carried out on the integral test facility, VISTA-ITL, which is a scaled down facility of the SMART plant. According to the experimental results, the pressurization rate and peak pressure are affected by the pressurizer type. The pressurization and depressurization rate with the steam pressurizer is smaller than the gas pressurizer since water has its inherent characteristic having latent heat while a nitrogen has ideal gas properties. The safety valve in both the gas and steam pressurizers is not opened during the transient. It is one of the characteristics of the integral reactor SMART design with a large pressurizer volume. The cooldown rate of the primary coolant system during the later part transient depends on the decay heat level regardless of the pressurizer type.