Control Rod Calibration of Nigeria Research Reactor -1 (Nirr-1) Using Positive Period Method

Description

– Control Rod Calibration of Nigeria Research Reactor -1 (Nirr-1) Using Positive Period Method –

Download Control Rod Calibration of Nigeria Research Reactor -1 (Nirr-1) Using Positive Period Method. Physics students who are writing their projects can get this material to aid their research work.

Abstract

Calibration of control rod has become an essential tool for measuring the reactivity changes in a reactor.

The Positive Period Method of control rod calibration was shown to be a relatively independent, more accurate and well suited to the core configuration and control rod mechanism of low power reactors.

The Nigeria Research Reactor-1 (NIRR-1) is a low power Miniature Neutron Source Reactor (MNSR).

In this work, NIRR-1 control rod was calibrated from 107mm to 177mm withdrawal length at a low flux of 5 x 10⁹ ncm²s^-1.

This flux and length was chosen to contain effects on reactivity due to temperature variation. Doubling times measurements were carried out in conjunction with the “Inhour” data to obtain reactor periods and their corresponding reactivities.

Introduction

The central characteristics of a nuclear reactor are its controllable, self-sustaining fission chain reaction which releases useful neutrons and energy (CNSC, 2003).

This controllability was shown to be greatly achieved via control rod motion and as such the knowledge of a reactor‟s response to specific control rod motions is essential for the safety, efficiency, operation and durability of a nuclear research reactor (Souza and Mesquita, 2010).

Research reactors are nuclear reactors that are majorly neutron source.Also called non-power reactors, the major contrasts between them and power reactors are that power reactors are utilized for electricity production,

heat generation, or maritime propulsion while the neutrons produced by a research reactor are used for several purpose which include scattering, non-destructive testing, analysis and testing of materials, production of radioisotopes, research and public outreach and education.

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