Qualification of RELAP5-3D code condensation model against full-scale PERSEO Test 9

被引：1
|
作者：
Bersano, A. [1 ]
Falcone, N. [1 ]
Bertani, C. [1 ]
De Salve, M. [1 ]
Meloni, P. [2 ]
Mascari, F. [2 ]
机构：
[1] Politecn Torino, Energy Dept, Corso Duca Abruzzi 24, I-10129 Turin, Italy
[2] ENEA FSN SICNUC SIN, Via Martiri Monte Sole 4, I-40129 Bologna, Italy
来源：
PROGRESS IN NUCLEAR ENERGY | 2021年 / 139卷
关键词：
Passive systems; RELAP5-3D; Condensation heat transfer coefficient; PERSEO; Accuracy evaluation; FFTBM; TRANSFORM BASED METHOD; FILM CONDENSATION; VALIDATION; DESIGN;
D O I：
10.1016/j.pnucene.2021.103891
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
Passive systems are being implemented in several nuclear plants already constructed, under construction or under design. The purpose of these systems is to increase the inherent safety of the plant in any transient condition, so they can provide a higher safety level in case of an accident. Best estimate thermal-hydraulic system codes, widely adopted in the nuclear field to perform deterministic safety analyses, need to be validated against the phenomena typical of passive systems (e.g. natural circulation, thermal-hydraulic behavior of large pools, low pressure phenomena, etc.). An experimental test facility called PERSEO (in-Pool Energy Removal System for Emergency Operation) was built at SIET laboratory in Piacenza (Italy) modifying the existing PANTHERS IC-PCC facility. It is a full-scale test facility aimed at studying a new passive heat removal system and it can be used to analyze the capability of system codes to simulate the related phenomena. In the present analysis, Test 9, which was performed in the PERSEO facility at around 4.1 MPa to study the activation and the heat removal capability of the proposed system, has been simulated with the RELAP5-3D code to assess its capability to predict the dominant phenomena of the transient. Particular attention has been dedicated to the analysis of condensation heat transfer coefficient computed by the code, since in previous analyses it has been found an evident underestimation of the power exchanged by the passive system. Alternative correlations for the condensation heat transfer coefficient have been identified and a correction factor for the heat transfer coefficient calculated by RELAP5-3D has been computed. After the application of the correction factor, the set composed by NusseltKutateladze-Chen correlations provided the better agreement with the experimental data. Finally, the accuracy of the code calculation has been evaluated qualitatively and quantitatively by adopting the Fast Fourier Transform Based Method.
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页数：14
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