Safety-Critical Valves for Nuclear Power
From reactor coolant isolation to containment boundary integrity and emergency core cooling — GLB delivers ASME III and RCC-M qualified valves engineered to the nuclear industry's most stringent safety and quality requirements.
Valves Across the Nuclear Island
Purpose-engineered valve solutions for primary, secondary, and auxiliary systems — meeting the safety classification requirements of each circuit boundary.
Primary Circuit — Reactor Coolant System
Reactor coolant isolation valves, pressuriser spray and relief valves, and primary loop gate valves for pressurised water reactor (PWR) and boiling water reactor (BWR) systems. Produced to ASME III Class 1 requirements with full seismic and environmental qualification.
Secondary Circuit — Steam Generators
Main steam isolation valves (MSIVs), feedwater control valves, and steam generator blowdown valves designed for high-temperature, high-pressure secondary loop service. ASME III Class 2 construction with rapid closure capability for accident mitigation.
Auxiliary Systems — Safety & Support
Emergency core cooling system (ECCS) valves, containment isolation valves, residual heat removal (RHR) valves, and chemical and volume control system (CVCS) valves. Designed for both safety-related and non-safety-related auxiliary service per ASME III Class 2 and Class 3.
Engineered for Nuclear-Grade Demands
Nuclear power applications impose unique challenges — seismic events, radiation exposure, absolute material traceability, and rigorous safety classification. Our valves are engineered and qualified to address each one.
Seismic Qualification (Category I)
All safety-related valves undergo Seismic Category I qualification per IEEE 344, demonstrating structural integrity and operability during and after a safe shutdown earthquake (SSE). Analysis and testing methodologies include both static and dynamic approaches.
Radiation Resistance & Environmental Qualification
Environmental qualification (EQ) testing per IEEE 323 and IEEE 382 confirms that valves and actuators maintain functional capability under design basis accident (DBA) conditions — including radiation exposure, elevated temperatures, and steam/chemical spray environments.
Full Material Traceability (Heat-to-Part)
Every pressure-retaining component is traced from melt source to finished part. Certified material test reports (CMTRs) per EN 10204 3.1/3.2, positive material identification (PMI), and serialised records ensure complete auditability throughout the supply chain.
Safety Classification (ASME III Classes 1, 2 & 3)
Valves are designed, produced, and stamped in accordance with ASME Boiler and Pressure Vessel Code Section III, Division 1. Safety class assignment follows ANSI/ANS 58.14 and regulatory guide requirements for primary, secondary, and auxiliary system boundaries.
Relevant Certifications
Every valve supplied to the nuclear sector is designed, produced, and documented in full compliance with the applicable nuclear codes, standards, and regulatory requirements.
Valves for Nuclear Power
Gate Valves
Flexible and solid wedge designs, 2" to 36", Class 150–2500. ASME III certified for nuclear safety-class service.
View Product RangeGlobe Valves
Precision throttling and isolation, 1/2" to 24", Class 150–2500. Stellite-hard-faced trim for extended service life.
View Product RangeCheck Valves
Swing, piston & tilting disc, 2" to 36". Designed to prevent reverse flow in safety-related piping systems.
View Product RangeBall Valves
Floating & trunnion mounted, 1/2" to 36", Class 150–2500. Suitable for auxiliary and containment isolation applications.
View Product RangeDiscuss Your Nuclear Project Requirements
Share your project specifications and our nuclear-qualified engineering team will respond with a detailed technical proposal. ASME III, RCC-M, and 10 CFR 50 Appendix B programmes available.