Opportunities / ENERGY, DEPARTMENT OF

ATR Loop Pressurizer Fabrication

Description (excerpt)

INTRODUCTION Battelle Energy Alliance, LLC (BEA), Management & Operating Contractor of the U.S. Department of Energy (DOE) owned Idaho National Laboratory (INL), is seeking an Expression of Interest (EOI) from qualified vendors capable of fabricating an ASME Section VIII, Division 2 pressure vessel for use as the ATR Loop Pressurizer (1A-NE Loop). The fabricated vessel will play a critical role in maintaining system pressure, degassing, and surge compensation for an Advanced Test Reactor (ATR) experiment loop. BACKGROUND INL is a U.S. Department of Energy (DOE) national laboratory dedicated to nuclear energy, national security, and clean energy innovation. The ATR experiment loops rely on a dynamic pressurizer system to maintain primary coolant pump pressure, provide a means of degassing the primary coolant, and compensate for pressure surges. BEA is requesting vendor capability statements for the fabrication of a vertically oriented, leg-mounted pressure vessel with radial side arms, built to strict nuclear, metallurgical, and structural performance standards. Project-specific INL drawings, design calculations, and procedural references will be furnished to selected vendors. The scope of work includes the following: Fabrication, inspection, and physical testing of one (1) ASME Section VIII, Division 2 stainless steel pressure vessel with associated appurtenances (vessel, mounting leg stand, spray nozzles, lifting lugs), per INL Drawings 1050604, 1050605, and 1050606 Supply of all materials associated with the vessel and appurtenances Hydrostatic testing at room temperature in accordance with ASME code (minimum test pressure 3415 psig, +100/-0 psig tolerance) Load testing and documentation of lifting lugs Shop drawing development and submission through INL's vendor data system Shipping/handling pallet and container for horizontal-orientation transport, forklift-compatible Delivery to WestOne Logistics, Idaho Falls, ID The scope of work does not include the following: Installation at the Contractor's facility Procurement and installation of clamp-on heaters Vessel insulation Design, seismic analysis, thermal analysis, stress analysis, or fatigue analysis Overpressure protection (provided by a separate direct spring relief valve) Floor mounting plate APPLICABLE CODES AND REFERENCES The fabrication and associated documentation must comply with the following (as applicable to component type): ASME Section VIII, Division 2 (2025) AISC 370 (2021) ANSI/AISC N690- …

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