Analysis of Density Wave Oscillations in Helically Coiled Tube Once-Through Steam Generator. (15th December 2016)

• Record Type: Journal Article
• Authors: Hao, Junwei; Zhang, Yaoli; Zheng, Jianxiang; Zhou, Zhiwei; Sheng, Xuanyu; Hong, Gang; Ye, Kai; Li, Ning
• Other Names: Clausse Alejandro Academic Editor.
• Is Part Of: Science and technology of nuclear installations. Volume 2016(2016)
• Publication Date: 2016-12-15
• Subjects: Nuclear engineering -- Periodicals; Nuclear facilities -- Periodicals; Nuclear engineering; Nuclear facilities; Electronic journals; Periodicals; 621.48
• DOI: 10.1155/2016/3071686
• Languages: English
• ISSNs: 1687-6075

Abstract

Abstract : Helically coiled tube Once-Through Steam Generator (H-OTSG) is one of the key equipment types for small modular reactors. The flow instability of the secondary side of the H-OTSG is particularly serious, because the working condition is in the range of low and medium pressure. This paper presents research on density wave oscillations (DWO) in a typical countercurrent H-OTSG. Based on the steady-state calculation, the mathematical model of single-channel system was established, and the transfer function was derived. Using Nyquist stability criterion of the single variable, the stability cases were studied with an in-house computer program. According to the analyses, the impact law of the geometrical parameters to the system stability was obtained. RELAP5/MOD3.2 code was also used to simulate DWO in H-OTSG. The theoretical analyses of the in-house program were compared to the simulation results of RELAP5. A correction factor was introduced to reduce the error of RELAP5 when modeling helical geometry. The comparison results agreed well which showed that the correction is effective.