1. 1 CM24 – 2 nd June 2009 LH2 Infrastructure M Hills M Courthold T Bradshaw I Mullacrane P Warburton

2. 2 CM24 – 2 nd June 2009 Outline 1.R&D System Manufacture a)Cryostat b)Instrumentation selection 2.Ventilation System 3.Safety 4.Next Steps 5.Controls (PW)

3. 3 CM24 – 2 nd June 2009 Cryostat modifications (1) Increased heat exchange with 1 st stage of cryocooler to utilise the cooling power available at ~50K

4. 4 CM24 – 2 nd June 2009 Cryostat modifications (2) Condensing pot Dummy absorber pot Radiation shield Upper radiation shield/1 st stage heat exchange Pre- cooling loops

5. 5 CM24 – 2 nd June 2009 Cryostat Instrumentation o Level sensors o ATEX approved gauges either not available commercially or prohibitively expensive o Therefore chosen to use a chain of resistors o Heaters o Cartridge heaters on condensing pot (50W + 20W) o Absorber pot – 3 x cartridge heaters to boil off liquid o Thermometry o PRTs on condensing pot and absorber o Cernox on cryocooler 2 nd stage

6. 6 CM24 – 2 nd June 2009 Gas Panel Instrumentation o All valves identified o Suppliers identified for instrumentation and discussions on exact specification underway

7. 7 CM24 – 2 nd June 2009 Ventilation System H2 vented during operation of relief valves is separate form ventilation system

8. 8 CM24 – 2 nd June 2009 Ventilation System (2) Ducts routed to avoid drain

9. 9 CM24 – 2 nd June 2009 Ventilation System (3) oCase for standard ducting has been made to ISIS safety representatives and accepted oInitial quotation received for ductwork and negotiations ongoing with contractor. oDecision still to be made on fans oDSEAR compliance oWhat is a safe time of persistence for an explosive mixture?

10. 10 CM24 – 2 nd June 2009 Safety Issues oSpecification of ventilation system fans oApproval of ventilation system design against DSEAR requirements oDesign of safety functions in control system oProduction of documentation to demonstrate compliance with both DSEAR and IEC61508 – this is not insignificant. oTiming and scope of safety reviews oInternal MICE project review oExternal review before full operation

11. 11 CM24 – 2 nd 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.

12. 12 CM24 – 2 nd June 2009 MICE Hydrogen Control System MICE Collaboration Meeting 24 June 2, 2009 PJ Warburton - Daresbury Lab

13. 13 CM24 – 2 nd June 2009 Control System Tasks Safety Functions - Hardwired Valve Control - PLC H2 Control Room Layout SIL Rating (BS EN 61508)

14. 14 CM24 – 2 nd 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

15. 15 CM24 – 2 nd 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

16. 16 CM24 – 2 nd June 2009 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. 17 CM24 – 2 nd June 2009 Control Sequences Helium Purge Cryostat Evacuation Helium Fill Helium Empty Hydrogen Fill Hydrogen Empty Diagnostic

18. 18 CM24 – 2 nd June 2009 Hydrogen Control Room Layout Room Cleaned Out New Door Pipe Work to be Removed Cabinet Support Frames Cable Routes Established

19. 19 CM24 – 2 nd 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 1SIL 2SIL 3

20. 20 CM24 – 2 nd June 2009 Questions