Safety principles and I&C Design

Björn Wahlström*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

Design of nuclear power plants (NPP) relies on the application of many different safety principles. This applies also to the design of instrumentation and control (I&C) systems, which have the important task of ensuring that the NPP never enters unsafe states. In I&C design one may separate between two control tasks, 1) to maintain the NPP in a safe region and 2) if the NPP enters an unsafe region steer it back to a safe region. These two tasks set the ultimate goal of the I&C system, which in the design process are broken down into specific sub-goals of I&C subsystems. I&C design is typically advancing from overarching abstract considerations through sequences of elaborations into concrete design solutions. The design process is governed by several more or less explicitly formulated safety principles. Some of the safety principles are general and others are specific. Sometimes there is a need to decide on which safety principle should be seen as primary in comparison with other secondary principles. Safety principles are applied in selecting design strategies, which aim at making certain failure mechanisms impossible or unlikely. In the paper I am arguing that there is a benefit of making the safety principles used in I&C design as explicit as possible as a part of the requirements specifications.

Original languageEnglish
Title of host publication9th International Topical Meeting on Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies, NPIC and HMIT 2015
PublisherAMERICAN NUCLEAR SOCIETY
Pages1171-1180
Number of pages10
Volume2
ISBN (Electronic)9781510808096
Publication statusPublished - 2015
MoE publication typeA4 Article in a conference publication
EventInternational Topical Meeting on Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies - Charlotte, United States
Duration: 22 Feb 201526 Feb 2015
Conference number: 9

Conference

ConferenceInternational Topical Meeting on Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies
Abbreviated titleNPIC and HMIT
Country/TerritoryUnited States
CityCharlotte
Period22/02/201526/02/2015

Keywords

  • A systems approach
  • Design processes
  • Instrumentation and control
  • Nuclear safety

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