SAFETY ANALYSIS OF NUCLEAR SYSTEM

Safety Analysis of the Proposed Nuclear System in Nigeria

Abstract

This dissertation is to study the Safety implication of the Proposed Nuclear System in Nigeria, the likelihood of fatality and its consequences should there be nuclear incident in Nigeria and then recommend an appropriate type of Nuclear energy system for the nation Nigeria based on her peculiar circumstances. The research work is intended to look at Nigerian as a nation in the introductory part and discuss its historical background, her position economically, within African continent and the world at large. The second chapter will study the present energy sources in Nigeria and how these have affected the nation economy and socio-political stability of the nation (consequently the need for an enhance power supply).

This work developed an integrated methodology to evaluate nuclear power plant safety effect by interactions between operator and digital I&C system, and then propose improvement recommendations. This integrated methodology includes component-level software fault tree, system-level sequence-tree method and nuclear power plant computer simulation analysis. Software fault tree can clarify the software failure structure in digital I&C systems. Sequence-tree method can identify the interaction process and relationship among operator and I&C systems in each D3 echelon in a design basis event. Nuclear power plant computer simulation analysis method can further analyze the available backup facilities and allowable manual action duration for the operator when the digital I&C fail to function. Applying this methodology to evaluate the performance of digital nuclear power plant D3 design, could promote the nuclear power plant operation safety. The operator can then trust the nuclear power plant than before, when operating the highly automatic digital I&C facilities.

Acronyms

Nuclear safety software development environment,

Software Configuration Management Security requirement,

Probabilistic safety assessment,

Very high temperature reactor,

Passive system,

Anticipated transient without scram,

Sensitivity analysis,

Containment spray injection system,

Nuclear safety system,

Nuclear power plant,

Probabilistic safety assessment,

Human reliability analysis; I&C system

Bayesian network,

Information theory,

Nuclear power plant operation.

Table of Contents

Abstractii

Chapter 1: Introduction1

General Features of Energy Economy in Nigeria2

Energy Crises In Nigeria3

Chapter 2: Literature Review6

Availability of Fuels and Construction Materials8

Manp Ower Development9

Proposed Safety Analysis14

Chapter 1: Introduction

In the nuclear field one of the principal activities for applications of risk-informed regulatory processes is the ranking of structures, systems and components with respect to their safety-significance. With reference to safety systems in particular, this requires an analysis of how the safety performance is affected by the stochastic behavior of the components constituting the system: importance measures and sensitivity indexes are often used for this scope. When realistic issues of system operation are included, such as components' ageing and maintenance, load-sharing, etc. and when uncertainty in the components parameters' values exist, the computation of these measures and indexes is not straightforward.

Sustainability is a critically important goal for human activity and development. Sustainability in the area of energy is of great important to any plans for overall sustainability given (i) the pervasiveness of energy use, (ii) its importance in economic development and living standards, and (iii) the significant impacts that energy processes and systems have had, and continue ...