SNS BL-13B NPDGammaExperiment

Hydrogen Supply to Cryogenic Target , Relief and Vent System Design Review

April 7, 2010C-1569:00 – 10:30 PM

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Hydrogen System Block Diagram

Diagram of Major System Components

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Hydrogen System Schematic

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H2 Cylinder Storage Cabinet Shared w/ BL-11A

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BL-13 Cave w/Shielding In-Place

Vent Stack

Vent Isolation Box

Cryo Coolers

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Overview Showing Target Vent from Cave to Vent Isolation Box and Vent Line Outside Building

Vent Stack

Vent Isolation Box

Target Hydrogen Vent

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Target Vent Going Over Beamstop

Target Hydrogen Vent

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Vent Isolation Box Just North of Cave

Vent Isolation Box

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Vent Isolation Box on Platform Outside Cave Above Vent Isolation Cabinet

Vent Isolation Platform

Vent Isolation Cabinet

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Vent Isolation Box Internals

Box & Cabinet Vent Line

Relief Vent Line

Relief Valves and Rupture Discs

Vacuum Turbo Pumps

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Vent Stack from Vent Isolation Box Leaving Building

Box & Cabinet Vent Line

Relief Vent Line

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Hydrogen System Major Equipment

• HYDROGEN, ARGON, HELIUM GAS CYLINDERS• TRANSFER TUBING 0.25-INCH x 0.035” WALL• GAS PANEL CABINET• HYDROGEN FILL TUBE 1.5-INCH X 0.065” WALL• LH2 VESSEL / VACUUM CHAMBER• DOUBLE WALL HYDROGEN VENT TUBING

– INNER HYDROGEN VENT TUBE 1.5-INCH X 0.065” WALL– OUTER VACUUM / VENT TUBE 6.0-INCH” X 0.083” WALL– METAL BELLOWS

• VENT ISOLATION CABINET• VENT ISOLATION BOX 10” NPS , Sch. 10• HYDROGEN VENTS TO ATMOSPHERE 6” NPS, Sch 5 & 8” NPS

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Safety Considerations• SEISMIC INTERACTION ( PC 0 OVER PC 2 ) • DESIGN / CONFIGURATION CONTROL• ACCIDENT MITIGATION• OVERPRESSURE PROTECTION• ARGON UTILIZATION• HYDROGEN DEFLAGRATION / DETONATION• LOSS OF VACUUM IN 6-INCH LINE• RUPTURE OF 1.5-INCH LINE• FIRE IN TARGET BUILDING• MATERIAL EMBRITTLEMENT

– CRYOGENIC– HYDROGEN

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Codes and Standards

• DOE-STD-1020• DOE-STD-1021• ASME B 31.3, “Process Piping”• ASME B 31.12-2008, “Hydrogen Piping and Pipelines”• CGA S-1.3, “Pressure Relief Device Standards-Part 3-

Compressed Gas Stationary Storage Containers”• CGA G-5.5 – 2004, “Hydrogen Vent Systems”• EJMA, “Expansion Joint Manufacture Association”

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Design Loadings• DEADWEIGHT SPANS PER MSS SP 69• NORMAL OPERATING PRESSURE• POSTULATED OVERPRESSURE EVENTS • THERMAL EXPANSION / CONTRACTION• SEISMIC

– IBC-2007– PERFORMANCE CATEGORY 2– SITE CLASS D– IMPORTANCE FACTOR = 1.5

• WIND / TORNADO• DEFLAGRATION / DETONATION • THRUST LOADINGS• BELLOWS• VENT DISCHARGE

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Hydrogen Vents to Atmosphere

• 6-INCH FROM VENT ISOLATION BOX• 8-INCH FROM GAS PANEL CABINET & VENT ISOLATION CABINET• WELDED VERSUS VICTAULIC• AUSTENETIC STAINLESS ( TP 304 ) MATERIAL • MINIMIZE ( L / D ) RATIO • L / D > 60 BUT < 100 DEFLAGRATION• L / D > 100 DETONATION• DISCHARGE HEIGHT• 10-FEET ABOVE GRADE

• TOP OF ROOF• WIND / TORNADO / MISSLES• LOW POINT DRAIN

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H2 Bottle Rack Shared with BL-11A

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ALLOWABLE WORKING PRESSURELH2 VESSEL / MAIN VACUUM CHAMBER

• LH2 Vessel– Internal pressure: (1) Cylindrical Shell Pint = 279 psi

(2) Entrance Window Pint = 132 psi(3) Exit Window Pint = 207 psi

– External pressure: (1) Cylindrical Shell Pext = 81 psi(2) Entrance Window Pext = 16 psi(3) Exit Window Pext = 296 psi

• Main Vacuum Chamber– Internal pressure: (1) Cylindrical Shell Pint = 399 psi

(2) Entrance Window Pint = 32 psi(3) Exit Window Pint = 90 psi(4) Rectangular Box Pint = 99 psi

– External pressure: (1) Cylindrical Shell Pint = 134 psi(2) Entrance Window Pint = 134 psi(3) Exit Window Pint = 208 psi(4) Rectangular Box Pint = 99 psi

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VICTAULIC COUPLING CAPACITY