Injection to Steam Generator Strategy Analysis to Station Black Out Severe Accident Management and Prevention of a Steam Generator U-Tubes Creep Rupture Accident

Zarnousheh Farahani, Arefoddin; Nematollahi, Mohammadreza; Pirouzmand, Ahmad; Rabiee, Ataollah; Faghihi, Farshad

doi:10.24200/nst.2025.1773.2092

Injection to Steam Generator Strategy Analysis to Station Black Out Severe Accident Management and Prevention of a Steam Generator U-Tubes Creep Rupture Accident

Articles in Press

Document Type : Research Paper

Authors

Arefoddin Zarnousheh Farahani

mohammadreza Nematollahi

Ahmad Pirouzmand

ataollah rabiee

Farshad Faghihi

Shiraz University

10.24200/nst.2025.1773.2092

Abstract

one of the proposed measures in managing severe accidents, including SBO, to prevent the occurrence of SGTR is to install additional access routes for injection and flow on the secondary side of the steam generator. In other words, providing emergency cooling water using portable external cooling water sources, such as fire engines or mobile tanks, can effectively reduce the consequences of severe accidents and manage them. In this study, after fully modeling the primary, and secondary loops and the reactor containment using the MELCOR severe accident analysis code, the effectiveness of the cooling water injection strategy from a mobile external source during a SBO severe accident in a western-type Two-Loops PWR power plant has been investigated. Comparison of modeling results of applying the strategy of external cooling water injection in the secondary loop area of the steam generator using fire engines on the progression of a severe accident with the modeling results of a severe accident of SBO without any intervention or management action shows that, if sufficient fluid is injected with a proportional mass flow rate, it can effectively remove heat from the primary loop and residual core heat and prevent temperature increase and increase in the Larson Miller damage function in the steam generator pipes. As a result, this strategy controls the consequences of a severe accident by preventing the occurrence of a steam generator tube rupture after a SBO accident and prevents the release of radioactive materials outside the reactor containment building and spreading into the environment.

Keywords

Severe Accident Management

MELCOR code

Steam Generator Tubes Rupture (SGTR)

Radioactive Material Release

Station Black-Out (SBO) Accident

Main Subjects