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LH2 Safety Issues for MICE

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burst test. Liquid nitrogen test burst test per UG-101 of the ASME code ... Burst test 5 vacuum windows at room temp. to demonstrate a burst pressure of at ... – PowerPoint PPT presentation

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Title: LH2 Safety Issues for MICE


1
LH2 Safety Issues for MICE
  • O2/LH2 separation
  • No Ignition sources near LH2
  • Adequate ventilation
  • Affects
  • Windows absorbers and vacuum
  • Primary and secondary vacuum volumes
  • Support structure absorber/focussing coil
  • Instrumentation (experiment and monitors)
  • Cryogenic operation
  • Laboratory area
  • Cooling concerns
  • Minimizing window thickness/no. of windows
  • Uniform heat maintainance of LH2

2
Catagories for FNAL LH2 Mucool Safety Review
  1. Civil construction
  2. Absorber windows
  3. Vacuum vessel windows
  4. Safety controls systems
  5. Electrical safety of hydrogen areas

3
Safety Codes and Standards for FNAL Mucool LH2
System
  • FERMILAB STANDARDS (FESHM)
  • Guidelines for the Design, Review and Approval
    of Liquid Cryogenic Targets
  • Liquid Hydrogen System Guidelines
  • Storage and Use of Flammable Gases
  • Cryogenic System Review
  • Oxygen Deficiency Hazards
  • OtherPressure Vessels, Dewars, Electrical, etc.
  • NATIONAL CODES
  • ASME Code
  • National Electric Code
  • National Fire Protection Association Code
  • Compressed Gas of America Standard
  • ISA Application of Safety Instrumented Systems

4
FNAL Safety Requirements for Windows
  • Absorber Windows
  • Design
  • Internal WAMP 25 psid
  • FEA showing max. allowable stress lt 0.25 UTS
    (this is waived by meeting the performance tests
    below)
  • Material certification
  • Window engineering/design drawing
  • Tests
  • Room temperature tests per UG-100 of the ASME
    code and room temp. burst test.
  • Liquid nitrogen test burst test per UG-101 of
    the ASME code
  • Note The LH2 circuit safety relief system
    includes 2 valves with a 10psid set point. In
    addition, a PLC-controlled vent valve will be
    installed

5
FNAL Safety Requirements for Windows (2)
  • Vacuum Windows
  • Assumption Design assumes that the beampipe
    attaches to absorber vacuum windows, therefore
    vacuum exists on both sides of the windows
  • Design
  • Internal WAMP 25 psid
  • External MAWP 15 psid
  • FEA showing maximum allowable stress is lt2/3 Sy
    or lt 0.4 Su
  • Material certification
  • Window drawing
  • Tests
  • Burst test 5 vacuum windows at room temp. to
    demonstrate a burst pressure of at least 75 psid
    for all samples. (pressure exerted on interior
    side of vacuum volume).
  • Non-destructive tests at room temperature
  • External pressure to 25 psid to demonstrate no
    failures no creeping, yielding, elastic
    collapse/buckling or rupture
  • Other absorber vacuum jacket testing to ensure
    its integrity

6
FNAL Safety Requirements for Controls
  • Safety Interlocks (Quadlog PLC) and Controls
    (Apacs)
  • Functions
  • Control operations of the LH2 system
  • Safety interlocks for the LH2 system
  • Safety actions in the case where flammable gas or
    ODH conditions are detected
  • System design
  • Design requires knowledge of equipment value in
    the experimental hall
  • An estimate of failuer severity and frequency
    will be made as well as the consequences to
    personnel and equipment
  • The overall risk will be evaluated to determine a
    Safety Integrity Level (SIL).
  • The SIL will determine the safety controls
    architecture (level of redundancy required) per
    ANSI/ISA-84.01, Application of Safety
    Instrumented Systems for the Process Industries

7
Instrumentation Safety
  • Temperature/density uniformity inside LH2
  • Safety instrumention inside vacuum area
  • Detectors for cooling measurements

Safety Issues 1. Limits the amount of
energy/(area or vol) 2. Physical size of the
signal feedthroughs 3. Distance away from target
(e.g. VLPC readouts) 4. Seals from signals to
electronics wires fibers tubes
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