ISO CLASS 7 / 8 CLEANROOM • 1,500T TANDEM CRANE RIGGING • ITER/SPARC QA

Fusion Cryostat Assembly Hall Heavy Rigging & Cleanliness Audit

Pre-rigging engineering hold points for lifting and positioning 1,250-ton tokamak cryostat base components and 440-ton vacuum vessel sub-assemblies into the reactor pit with sub-millimeter precision.

Rigging Safety Score

Pre-Rigging Inspection Required

Hold Points Cleared

0 / 16

Quality Sign-Offs Passed

Crane Synchronization

≤ 0.5% Delta

Dual 750T Hook Load Balance

Lift Authorization

HOLD • QA AUDIT PENDING

Tokamak Chief Rigging Engineer

Cleanroom Protocol & Particulate Controls

ISO Class 7 / Class 8 Airborne Particulate Verification

Air particle counters confirm < 352,000 particles/m³ ≥ 0.5 μm across the assembly hall crane envelope.

SPMT De-greasing & Clean Airlock Washdown

Transporter wheels wiped with solvent wipes; hydraulic power pack enveloped in sealed positive-pressure cleanroom skirt.

Non-Volatile Residue (NVR) Swab Testing

Vacuum vessel stainless steel 316L(N)-IG surfaces swabbed; hydrocarbon residue < 5 mg/m² verified.

Ultra-Dry Nitrogen Purge Gas Supply Active

Cryostat thermal shield flow channels pressurized with 99.999% GN2 at 0.3 bar gauge with dew point < -65°C.

Tandem Crane Synchronization & Rigging Gear

Dual 750-Ton Overhead Bridge Cranes Interlocked

Electronic master-slave sync tested; hoist speed differential ≤ 0.1 mm/s; hook height skew < 2.0 mm across 40m span.

Modular Heavy Spreader Beam NDT Sign-Off

1,500T cruciform lifting beam magnetic particle (MPI) and ultrasonic tested (UT); proof-tested to 125% rated capacity.

Strand Jack Micro-Leveling Calibration

Secondary hydraulic strand jacks calibrated for micro-adjustment; individual stroke resolution ≤ 0.05 mm.

Dynamic Load Cell Real-Time Telemetry Link

Continuous telemetry feed to Exspeedite Command Console; audible alarms triggered at > 1.5% load variance.

Laser Metrology & 3D Photogrammetry

Reactor Pit Spatial Reference Network Locked

Primary tokamak geodetic coordinate system established with 16 temperature-compensated wall invar monuments.

Multi-Tracker Triangulation Array Online

Four synchronized laser trackers (Leica AT960) tracking 32 retroreflector spheres on cryostat rim during descent.

Real-Time Gap & Clearance Scanning (≥ 50mm)

High-speed line laser scanners monitor radial clearance between cryostat base and concrete bio-shield wall.

Final Seating Leveling Target (±0.5mm Planar)

Target horizontal resting plane tolerance verified across 18 spherical support bearings on the pit lower foundation.

Pit Seating, Grouting & Seismic Anchors

Hydraulic Jacks Controlled Load Transfer

18-point synchronized hydraulic de-jacking system transfers 1,250T load from crane onto foundation pedestals at ≤ 5T/min.

Pre-Stressed Seismic Anchor Stud Tensioning

High-tensile Inconel 718 anchor bolts hydraulic tensioned to specified pre-load (550 kN per bolt) with ultrasonic elongation check.

Non-Shrink Epoxy Grout Flow Verification

High-strength epoxy resin grout pumped beneath base plates with zero void formation confirmed via ultrasonic echo.

Joint Rigging & QA Hold Point Sign-Off

Formal signature by Tokamak Assembly Director, Lead Rigging Superintendent, and Third-Party Nuclear QA Inspector.

Submit Heavy Rigging Audit & Sign-Off

Transmit this assembly hall inspection checklist to the Exspeedite Nuclear Rigging Engineering Command.

Chief Rigging Engineer / QA Lead *

Facility / Institute Email *

Tokamak Facility & Building

Heavy Component Under Hoist

Special Rigging Notes & Exception Logs