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Re-evaluation of level 2 PSA results of a VVER-1000 NPP with consideration of innovative severe accident management strategies
, Article Annals of Nuclear Energy ; Volume 151 , 2021 ; 03064549 (ISSN) ; Jamshidi, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
The ultimate purpose of the nuclear power plant safety is to protect the public and the environment from unacceptable radiation exposure in all operational states. This paper presents a novel severe accident management framework to cope with the risk of radioactive material release to the environment. The objective is to reduce the contribution of severe accidents to the large and early release frequencies of radioactive materials for a VVER-1000 nuclear reactor. The proposed approach includes the emergency actions of NPP personnel aiming to recover the lost alternating power and restore the core cooling process by all means available at the site. In addition, mobile equipment including a...
Assessment of Spray System Capability to Reduce Containment Pressure and Deposit Fission Product during Large Break Loss of Coolant Accident (Lb-Loca) without Access to Active Part of Eccs System in Bushehr Nuclear Power Plant
, M.Sc. Thesis Sharif University of Technology ; Ghofrani, Mohammad Bagher (Supervisor) ; Saghafi, Mehdi (Co-Supervisor)
Abstract
The capability of Bushehr nuclear power plant spray system to reduce fission product and control a specified severe accident has been investigated in this study. In order to evaluate spray system in one of the worst cases for containment, we have chosen Large Break Loss of Coolant Accident (LB-LOCA) without access to active part of ECCS system. We have only simulated containment, so the leakage of various materials from core and primary circuit of nuclear power plant are considered as the boundary conditions for simulation. Following the Fukushima accident in 2011, many nuclear safety legislative groups concentrated on using mobile equipment which is essential for nuclear power plants these...