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An introduction to DIAMOND Personnel Safety System

An introduction to DIAMOND Personnel Safety System. By Martin Wilson Principle Personnel Safety Engineer. Contents. The Requirements Hazard Management Access Zones Personnel Safety Hardware Test strategy EPICS. The Requirements. Why do we need PSS?

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An introduction to DIAMOND Personnel Safety System

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  1. An introduction to DIAMOND Personnel Safety System By Martin Wilson Principle Personnel Safety Engineer

  2. Contents • The Requirements • Hazard Management • Access Zones • Personnel Safety Hardware • Test strategy • EPICS

  3. The Requirements Why do we need PSS? 1. We can’t separate the hazard from the product 2. Required by LAW Legal Requirement under Health and Safety at Work act 1974 / IRR99 • Senior management are liable to prosecution and punishment • Persons ignoring or interfering with processes or equipment may also be liable to prosecution

  4. The Requirements Personnel Safety, the Legal and Site Requirements • Designation of controlled and supervised areas • Prior examination of plans • Risk assessments and hazard management • Conduct of investigations • Regular calibration of equipment • Periodic examination and testing

  5. Hazard Management • Identify and Log Hazards • Assess and control Risk • Operate • Monitor and Log events • Review • Decommission

  6. Hazard Management • Risk Matrix • Reduce severity • Reduce likelihood

  7. Hazard Management Mitigation for a Radiation Hazard • Shielded enclosure with access via locked labyrinths 2.   Captive Permit key allowing access or beam operation 3.   A personnel safety system with the following features : • Micro-switches on doors as interlocks • Search required prior to operation • Audible Warnings • Annunciator indicating vault status • Blue lights in vault when access is not allowed • Signs in vault indicating danger

  8. Access Zones

  9. Daresbury Hardware ESRF DIAMOND

  10. Hardware PLC verses Hardware • Simple failure modes • Established system based on DL SRS system • User confidence in system • Easier to maintain over a 30 year life • Many of the advantages of a PLC are not requirements of high integrity system • Configurability • Upgradeability • Ease of change

  11. Hardware • Dual guard rail interlock system • Based on Relays • Redundant • Diverse • Interfaced to VME/EPICS via a G64 adaptor • PPC VME processor to readout module status

  12. Hardware : Dual Guard Rail System

  13. Hardware : SRS Safety Module

  14. Hardware : SRS Backplane

  15. Hardware : VME to G64 adaptor (prototype)

  16. Test strategy Markov model of dual guard rail System

  17. Test Strategy • Modules Test • Crate test • System test • On line test

  18. EPICS 1. Each PSS rack is an IOC 2. Develop device driver for VME/G64 and PSS modules – This gives access to the PSS status and allows the modules to be RESET

  19. EPICS 3. VxWorks applications to check guard line operations and test routines - detect faults as they develop and help to prevent double faults 4. Scripts to sequence resets as part of the search 5. EDM extension to show logic process graphically and to allow resets

  20. EPICS : Typical Reset Window

  21. Additional safety measures • Local Rules • Formal Analysis (Fault Tree analysis) • Change control • Safety committee

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