The MICE Hydrogen System Summary

Tom Bradshaw, Yury Ivanyushenkov, Elwyn Baynham, Tony Jones, Mike Courthold and Matthew Hills

Rutherford Appleton Laboratory

There are two phases to the implementation of the hydrogen delivery system:

•R&D Phase where a single system is developed and tested on a test cryostat which represents an absorber.

•Implementation phase where the delivery system is matched to a real MICE absorber

The objective of the R&D phase is to demonstrate a safe hydrogen delivery system for the absorber.

This will consist of a first model MICE hydrogen delivery system together with a test cryostat that does not have thin windows but does contain the same instrumentation.

Objectives of R&D

System Overview

•Gas Delivery System

•Hydride bed for gas storage

•Control Valves, pumps, alarms and indicators

•Buffer volume

•Control System

•Controllers

•Interface to the rest of MICE

•Test Cryostat

•Cryocooler

•Instrumentation

•Hydrogen volume

Test Cryostat

Gas Panel

Vacuum System

Exhaust

Heater Chiller

Hydride Bed

Storage

Buffer Volume

Hydrogen Delivery Control System

MICE Control System

Extraction Hood

Safety Relief

Safety Review Process

We are here

Safety Review Contents

1. MICE Overview (Mike Zisman)

2. Introduction (Tom Bradshaw)

3. Process and Instrumentation Diagrams (Matthew Hills)

4. Control System (Mike Courthold)

5. Hall Infrastructure and R&D Cryostat (Tony Jones)

6. HAZOP and failure analysis (Yury Ivanyushenkov)

7. Summary (Tom Bradshaw)

First walk through was held on the 21st October – review items were collected and will be dealt with

Need to produce the terms of reference for the review

Need to produce a test plan

Current Activities

Main activities are:

•The safety review

•R&D system is being detailed

•Process and instrumentation diagram has been revised

•Control system algorithms being developed

Cryostat

HeliumStore

Gas Panel

Venting

Vac. Pumps

Heater/ChillerUnit

HydrogenBottle

H

H H

H

H

System P&ID Pipework Identification

Process and instrumentation

Identified supplierd for most of the components for the system e.g. relief valves, level indicators etc…

• Tyco (AG Series 90) Relief Valves– Pilot valves – quick acting– 3% tolerance on set

pressure– Closes at 95% of set

pressure– Response time is <0.5s

• BS&B Low Pressure Reverse Buckling Disc– ±5% tolerance on burst

pressure– Vacuum/back pressure

resistant• Hand Valves can be locked off

as necessary

Also specified temperature sensors, pumps, pressure and vacuum gauges

Hydride Bed

Original supplier is unable to provide anything We have found an alternative supplier in Austria – good specification and cheaper

• Supplier: TREIBACHER INDUSTRIE AG

– The nominal figures for the absorption temperature is -10°C and +20°C for the evolution temperature.

• Heat Transfer Medium - Water / glycolMH

• Weight: 120 kg

• Tank Structure A hull with 7 inter-connected stainless-steel storage cylinders , each with internal coil for cooling/heating .

• Dimensions Ø370 mm × L1500 mm (not including attachments), horizontal position

• Tank Total Weight 260-280 kg

• Operating Conditions:

– Charging Gas Component Hydrogen of 99.99% purity

– Charging Gas Pressure 1.2-1.7 bar abs

– Hydrogen Charging Rate Max 70 NL/min

– Discharging Gas Pressure 1.0-7.0 bar abs

Control System

• The control system will be implemented in Labview for the R&D tests.

• Once the algorithms have been developed they will be incorporated into EPICS (Experimental Physics and Industrial Control System), which is the control system that has been chosen for the MICE experiment.

Fortunately Labview possesses “Channel Access” capability, used by all EPICS clients, which will ease the subsequent transition to EPICS.

EPICS can be installed under a wide range of operating systems on a wide range of hardware platforms (eg Unix, Linux, Windows, vxWorks). The IOCs (Input Output Controllers), are traditionally built from VME cards and the 68xxx microprocessor family, running vxWorks, but other hardware platforms and operating systems are now supported. No decision has yet been taken on the hardware platforms and operating systems to be employed by MICE for EPICS.

• The control system naturally has two interfaces:– Hydrogen Absorber Cryostat system– Hydrogen Delivery system

Control System

• Hydrogen Delivery system– Normal control of the Hydrogen Delivery system can be sub-

divided as follows:• Purging the delivery system with Helium;• Filling the Hydrogen Absorber with liquid Hydrogen from the

Hydride Bed;• Maintaining the Hydrogen System in its normal running state;• Emptying the Hydrogen Absorber and returning the

Hydrogen back to the Hydride Bed.– Additionally it will be necessary to charge the Hydride Bed with

Hydrogen at the outset, and following any maintenance on the Hydride Bed.

– We are also developing the system to work with Helium

Control System – fill sequence

Chiller onSet TS1_sp = TS1_initial

PV2,3,5,7,14,17,18,19 closedCV4 closedPV1 open

VP2 on, PV20 open

Cooling System onSet TS2_sp = 15K

Start Pressure Control LoopStart Vac Monitor

Open PV2,3Open CV4

TS1<TS1_spAnd

VG3<1mbar

PG1PG1_sp

Close PV2&3 and CV4Stop Pressure Control Loop

Set TS1_sp = TS1_lowOpen PV5

LS1 > LS1_sp

H2 System Ready

Increment/DecrementTS1

EmptySequence

VG3<1mbar

Vac monitor

Pressure Control

Yes

No

Yes

No Yes

No

FillSequence

No

Yes

Other algorithms have been developed

Implementation in the Hall

Hope to have mezzanine in place for R&D tests

Implementation in the Hall R&D

R&D Test Cryostat

LIQUID LEVEL SENSOR 3

LIQUID LEVEL SENSOR 2

LIQUID LEVEL SENSOR 1

PRESSURE SENSOR CAPILLARY TUBE

COOLING COILTRANSFER LINE

ASECTION ON BB

A

BSECTION ON AA

B

3 CARTRIDGE HEATERS

3 CARTRIDGE HEATERS

2 LITRECAPACITY

22 LITRECAPACITY

MICE - HYDROGEN ABSORBER TEST CRYOSTAT

OHFC COPPERTUBES

1155 mm

580 mmDIAMETER

SUMITOMO SRDK-415DCOLD HEAD UNIT

PURGE GASINLETS

SHIELDEDHYDROGEN GASLINES

TOP FLANGE

Test cryostat will be sized to accommodate final absorbers.

HAZOP and FMECA

•HAZOP – HAZard and Operability assessmentThis is a formalised safety assessment that is based on nodes in the Process and Instrumentation Diagram

•FMECA – Failure Modes Effect and Criticality Analysis

This does what it says•Need to develop operational safety system

•Yury continues to develop these

Schedule

•Hydrogen delivery system review will take place 21st 22nd November•Hydride bed will be ordered soon•Cryostat – final details will be sorted out and will be ordered in the next month or so•Aim is to test mid 2006

Summary

The hydrogen system is being developed through an R&D process – the end result will be the first MICE hydrogen delivery system

Many aspects of the safety have been considered through calculation, design and review

We have a well defined safety review process

Making progress on the control, gas handling and test cryostat

Start tests mid-2006

MICE Hydrogen System

END