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LH2 Infrastructure

LH2 Infrastructure. M Hills M Courthold T Bradshaw I Mullacrane P Warburton. Outline. R&D System Manufacture Cryostat Instrumentation selection Ventilation System Safety Next Steps Controls (PW). Cryostat modifications (1).

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LH2 Infrastructure

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  1. LH2 Infrastructure M Hills M Courthold T Bradshaw I Mullacrane P Warburton

  2. Outline • R&D System Manufacture • Cryostat • Instrumentation selection • Ventilation System • Safety • Next Steps • Controls (PW)

  3. Cryostat modifications (1) Increased heat exchange with 1st stage of cryocooler to utilise the cooling power available at ~50K

  4. Cryostat modifications (2) Condensing pot Upper radiation shield/1st stage heat exchange Dummy absorber pot Radiation shield Pre-cooling loops

  5. Cryostat Instrumentation • Level sensors • ATEX approved gauges either not available commercially or prohibitively expensive • Therefore chosen to use a chain of resistors • Heaters • Cartridge heaters on condensing pot (50W + 20W) • Absorber pot – 3 x cartridge heaters to boil off liquid • Thermometry • PRTs on condensing pot and absorber • Cernox on cryocooler 2nd stage

  6. Gas Panel Instrumentation • All valves identified • Suppliersidentified for instrumentation and discussions on exact specification underway

  7. Ventilation System H2 vented during operation of relief valves is separate form ventilation system

  8. Ventilation System (2) Ducts routed to avoid drain

  9. Ventilation System (3) • Case for standard ducting has been made to ISIS safety representatives and accepted • Initial quotation received for ductwork and negotiations ongoing with contractor. • Decision still to be made on fans • DSEAR compliance • What is a safe ‘time of persistence’ for an explosive mixture?

  10. Safety Issues • Specification of ventilation system fans • Approval of ventilation system design against DSEAR requirements • Design of safety functions in control system • Production of documentation to demonstrate compliance with both DSEAR and IEC61508 – this is not insignificant. • Timing and scope of safety reviews • Internal MICE project review • External review before full operation

  11. Next Steps/Priorities

  12. MICE Hydrogen Control System MICE Collaboration Meeting 24 June 2, 2009 PJ Warburton - Daresbury Lab

  13. Control System Tasks • Safety Functions - Hardwired • Valve Control - PLC • H2 Control Room Layout • SIL Rating (BS EN 61508)

  14. Safety Functions • Operation Of The Ventilation System On Detection Of A Hydrogen Leak • Shut PV20 If There Is Pressure Rise In The Cryostat During Operation • Gas Panel Enclosure Interlocked to Prevent Access When Hydrogen Present

  15. Other Interlocks • A Shut-off Facility For The Hydride Bed Heater/Chiller On Detection Of Bed Overpressure • Cryocooler Shut-off If Temperature Drops Below Hydrogen Freezing Point (14k) or Heaters Faulty

  16. Control PLC • Omron CJ1M Modular PLC with Ethernet • Existing Software for Link to EPICS • NS8 Programmable Terminal (HMI), 8.4 inch Touch Screen with Ethernet • Feedback From Devices in Hazardous Areas Using Intrinsic Safety (Ex i) • Key Switches on Selected Functions

  17. Control Sequences • Helium Purge • Cryostat Evacuation • Helium Fill • Helium Empty • Hydrogen Fill • Hydrogen Empty • Diagnostic

  18. Hydrogen Control Room Layout • Room Cleaned Out • New Door • Pipe Work to be Removed • Cabinet Support Frames • Cable Routes Established

  19. SIL Rating • Tolerable Risk 10-5 Fatalities per Year From RAL Safety • How Safe is H2 System • Work In Progress

  20. Questions

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