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Personnel Protection System (PPS) – Definition

Personnel Protection System (PPS) – Definition. Interlock system, to protect personnel from Ionising Radiation (and other hazards) (Note: does not include equipment protection) Intended to satisfy the requirements of – [UK] Ionising Radiation Regulations 1999 (IRR99)

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Personnel Protection System (PPS) – Definition

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  1. Personnel Protection System (PPS) – Definition • Interlock system, to protect personnel from Ionising Radiation(and other hazards) • (Note: does not include equipment protection) • Intended to satisfy the requirements of – • [UK] Ionising Radiation Regulations 1999 (IRR99) • IEC 61508 (?)“Functional Safety of Electrical / Electronic / Programmable-Electronic Safety-Related Systems” –>

  2. PPS – What it does • Assisted search system, to clear personnel from (shielded) areas • Door locks, to keep area clear of personnel • Door switches, to make area safe on entry • Warnings – audible and visual (– People!) (– People!) • Permit / Prevent operation of equipment, to control the hazard(s) • via “Permits to Operate” (PPS outputs) –>

  3. PPS Design Criteria (for Accelerators) • Very low probability of ‘fail to danger’ • Use ‘failsafe’ techniques– implies safety is achieved by switching things off –>

  4. The Daresbury Laboratory Personnel Safety (PS) System (1 of 2) • Used on: SRS, ESRF, Diamond, ERLP, ISIS (from 2007) • Relay-based, modular, logic system • ‘Dual Guardline’ System • duplicated inputs, logic, & outputs • both circuits must agree it’s safe to operate ( 2oo2 system) • ‘Failsafe’ techniques • Current flow = safe • Relay logic (relays mostly fail open circuit) • Inputs from ‘Positive break’ safety switches –>

  5. The Daresbury Laboratory Personnel Safety (PS) System (2 of 2) • Provides audible and visible warnings (IRR99: ‘failsafe’?) • Search tone • Internal illuminating ‘Danger’ signs • Internal blue lighting • External illuminating signs • Annual check to ensure that both guardlines are fully functional • PS ‘Permits’ – principles for controlling equipment: • Disable equipment by two independent means • Disable equipment in a failsafe manner • Disable via hardware, not software (but safety-PLC ok?) –>

  6. MICE PPS • Search Areas • MICE Decay Solenoid Area • MICE Hall

  7. Decay Solenoid Area 4 3 1 MICE Hall 2 (shielding: schematical representation only)

  8. MICE PPS – Controlled equipment • ISIS Synchrotron Beam (to enable: Decay Solenoid Area vacated) • via ISIS PPS (hooks already included) • MICE RF System (to enable: MICE Hall vacated) • switch off RF drive to IOTs • switch off HT to IOTs

  9. MICE PPS – Controlled equipment, contd. • Superconducting Magnets – sequence to enable 1) MICE Hall searched (but ‘Limited Access’ permitted) 2) Hall inspection for loose magnetic material – not PS function 3) Insert and turn ‘Magnet Enable’ keyDropping search does not disable magnet PSU, – turn off key does • Interface to magnet PSU t.b.d. • Other systems … ? (over to you)

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