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1 CM24 – 2 nd June 2009 LH2 Infrastructure M Hills M Courthold T Bradshaw I Mullacrane P Warburton
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CM24 – 2nd June 2009
LH2 Infrastructure
M HillsM CourtholdT BradshawI MullacraneP Warburton
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CM24 – 2nd June 2009
Outline
1. R&D System Manufacturea) Cryostat b) Instrumentation selection
2. Ventilation System3. Safety 4. Next Steps5. Controls (PW)
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CM24 – 2nd June 2009
Cryostat modifications (1)
Increased heat exchange with 1st stage of cryocooler to utilise the cooling power available at ~50K
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CM24 – 2nd June 2009
Cryostat modifications (2)
Condensing pot
Dummy absorber pot
Radiation shield
Upper radiation shield/1st stage heat exchange
Pre-cooling loops
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CM24 – 2nd June 2009
Cryostat Instrumentation
o Level sensorso ATEX approved gauges either not available commercially or
prohibitively expensiveo Therefore chosen to use a chain of resistors
o Heaterso Cartridge heaters on condensing pot (50W + 20W)o Absorber pot – 3 x cartridge heaters to boil off liquid
o Thermometryo PRTs on condensing pot and absorbero Cernox on cryocooler 2nd stage
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CM24 – 2nd June 2009
Gas Panel Instrumentation
o All valves identifiedo Suppliers identified for
instrumentation and discussions on exact specification underway
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CM24 – 2nd June 2009
Ventilation System
H2 vented during operation of relief valves is separate form ventilation system
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CM24 – 2nd June 2009
Ventilation System (2)
Ducts routed to avoid drain
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CM24 – 2nd June 2009
Ventilation System (3)
o Case for standard ducting has been made to ISIS safety representatives and accepted
o Initial quotation received for ductwork and negotiations ongoing with contractor.
o Decision still to be made on fanso DSEAR complianceo What is a safe ‘time of persistence’ for an explosive
mixture?
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CM24 – 2nd June 2009
Safety Issues
o Specification of ventilation system fanso Approval of ventilation system design against DSEAR
requirementso Design of safety functions in control systemo Production of documentation to demonstrate compliance with
both DSEAR and IEC61508 – this is not insignificant.o Timing and scope of safety reviews
o Internal MICE project reviewo External review before full operation
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CM24 – 2nd June 2009
Next Steps/Priorities
1. Complete manufacture of the components of the R&D system that are being produced at AS Scientific.
2. Produce a prototype control system that, as a minimum, will allow the cryostat and gas panel to be tested.
3. Test system with Helium.
4. Produce the documentation required for a full safety case (including the controls).
5. Complete preparation of Hydrogen Control Room
6. Place contract and install the ventilation system in the hall.
7. Install bottle store along with N2 and He supply infrastructure
8. Integrate the hydride bed with the system and test with H2.
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CM24 – 2nd June 2009
MICE Hydrogen Control System
MICE Collaboration Meeting 24June 2, 2009PJ Warburton - Daresbury Lab
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CM24 – 2nd June 2009
Control System TasksSafety Functions - HardwiredValve Control - PLCH2 Control Room LayoutSIL Rating (BS EN 61508)
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CM24 – 2nd June 2009
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
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CM24 – 2nd June 2009
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
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CM24 – 2nd June 2009
Control PLCOmron CJ1M Modular PLC with EthernetExisting Software for Link to EPICSNS8 Programmable Terminal (HMI),
8.4 inch Touch Screen with EthernetFeedback From Devices in Hazardous
Areas Using Intrinsic Safety (Ex i) Key Switches on Selected Functions
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CM24 – 2nd June 2009
Control SequencesHelium PurgeCryostat EvacuationHelium FillHelium EmptyHydrogen FillHydrogen EmptyDiagnostic
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CM24 – 2nd June 2009
Hydrogen Control Room Layout
•Room Cleaned Out
•New Door
•Pipe Work to be Removed
•Cabinet Support Frames
•Cable Routes Established
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CM24 – 2nd June 2009
SIL Rating
Tolerable Risk 10-5 Fatalities per Year From RAL Safety
How Safe is H2 System
Work In Progress
10-4 10-3 10-2
SIL 1 SIL 2 SIL 3
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CM24 – 2nd June 2009
Questions
