ATR Plant Protection System (PPS) Seismic Switch Replacement

INTRODUCTION Battelle Energy Alliance, LLC (BEA), the management and operating contractor for the U.S. Department of Energy-owned Idaho National Laboratory (INL), is seeking Expressions of Interest (EOI) from qualified suppliers capable of providing environmentally and seismically qualified seismic switches for use in the Advanced Test Reactor (ATR) Plant Protection System (PPS). The purpose of this EOI is to identify suppliers with the technical capability, quality assurance program, testing facilities, and experience necessary to provide safety-related seismic switch equipment qualified for nuclear applications. This EOI is being issued for market research and acquisition planning purposes and is intended to identify potential suppliers for a future procurement opportunity. The EOI process is used by INL to develop a list of qualified and interested vendors that may be considered for future solicitations. BACKGROUND The ATR Plant Protection System currently utilizes seismic switches to provide a critical reactor protection function. Seismic switches detect ground motion and initiate a reactor scram when predetermined seismic thresholds are exceeded. The existing Kinemetrics Model TS-3A seismic switches are obsolete and have demonstrated performance degradation, resulting in increased reliance on limited spare inventory. Additionally, one seismic switch is currently out of service, placing the PPS in a reduced logic configuration. Replacement with modern, supported equipment is required to restore normal system configuration and ensure long-term reliability and maintainability. SCOPE OF INTEREST BEA seeks information from suppliers capable of providing complete seismic switch solutions meeting the functional, environmental, seismic qualification, testing, documentation, and quality assurance requirements typically associated with nuclear safety-related applications. Functional Capability Three-axis ground motion sensing capability. Dry contact output suitable for r