Mirion Technologies and Westinghouse launch digital instrumentation upgrade for global PWR fleets

Mirion Technologies Inc. (NYSE: MIR) and Westinghouse Electric Company LLC have entered into a strategic partnership to digitally modernize ex-core Nuclear Instrumentation Systems (NIS) in pressurized water reactors (PWRs) worldwide. The digital NIS upgrade is powered by Mirion’s proTK platform and is being offered exclusively through Westinghouse for both Westinghouse- and Combustion Engineering-designed reactors.

The initiative marks a critical step in replacing aging analog neutron flux monitoring drawers—many of which were designed in the 1960s—with a modern, digital infrastructure aimed at improving operational accuracy, reducing maintenance burdens, and extending plant lifecycles.

Mirion’s proTK platform, with more than 400 units already installed globally and over 4,000 reactor-years of operation, provides a drop-in replacement designed to minimize plant downtime and operator retraining. The plug-and-play architecture is expected to ease adoption across legacy nuclear fleets, particularly as global operators prioritize modernization ahead of relicensing and life-extension milestones.

What are the financial implications of Mirion Technologies’ strategic partnership with Westinghouse?

The announcement of the Mirion–Westinghouse collaboration triggered a nearly 6 percent gain in Mirion Technologies’ stock price, reflecting growing investor optimism about the partnership’s revenue potential. Analysts suggest the financial upside lies in Mirion’s access to long-cycle, service-based revenue streams as nuclear facilities migrate toward digital control systems.

Although the companies did not disclose the exact value of the agreement, institutional investors expect Mirion to benefit from high-margin system sales as well as ongoing support and maintenance contracts. Westinghouse’s exclusive global distribution rights further strengthen the potential for scaled deployment across both existing and future PWR upgrades.

The market’s initial reaction indicates a positive institutional sentiment around the growth trajectory for digital instrumentation in nuclear infrastructure. With utilities globally facing mounting pressure to upgrade aging assets without full system overhauls, Mirion’s proTK line is seen as a viable revenue catalyst.

How significant is the addressable market for digital ex-core NIS upgrades in legacy PWR fleets operated by Westinghouse?

Globally, over 100 pressurized water reactors still rely on legacy neutron flux monitoring systems developed more than 50 years ago. These analog systems are increasingly viewed as a bottleneck to modernization, particularly in plants seeking license renewals or operational extensions beyond 60 years.

Westinghouse’s global installed base of both its own and Combustion Engineering-designed PWRs positions it as a key channel partner for digital instrumentation retrofits. The new collaboration enables Mirion to address a large portion of this aging fleet with standardized, high-performance proTK units.

Utilities stand to benefit from lower lifecycle costs, increased diagnostic accuracy, and reduced labor intensity, while regulators are expected to welcome the improved reliability and traceability enabled by digital instrumentation. As energy security and decarbonization become central themes in national policy, upgrading instrumentation is becoming a priority spend item across nuclear operators in North America, Europe, and Asia.

What long-term performance benefits do digital proTK solutions offer over legacy analog systems?

The Mirion proTK platform replaces the analog neutron flux drawers with fully digital signal processing and monitoring systems that integrate seamlessly with existing control room infrastructure. Unlike legacy equipment that often requires frequent calibration and specialized upkeep, proTK systems offer real-time diagnostics, predictive maintenance capabilities, and improved data integrity.

Additionally, the proTK system supports enhanced modularity and fault-tolerance—features that make it suitable for both older reactors and newer digital control environments. By enabling digital logging, more refined flux tracking, and better interface with reactor protection systems, the platform elevates plant safety while lowering total cost of ownership.

Analysts expect that the most immediate gains will be seen in reduced downtime, faster troubleshooting, and fewer unplanned outages. These factors are particularly crucial for operators aiming to extend reactor lifespans amid tightening ESG and regulatory frameworks.

How are analysts and institutional investors viewing Mirion Technologies stock after the announcement, and what is the outlook?

Following the partnership announcement, shares of Mirion Technologies traded around USD 21.50 with elevated volume, suggesting increased institutional interest. The nearly 6 percent intraday price gain was interpreted as a vote of confidence in the company’s capacity to deliver on the digital upgrade initiative.

Institutional sentiment appears optimistic that Mirion will capture a significant share of the modernization market through this partnership, especially given Westinghouse’s access to a large number of operating plants. While investors await financial details in upcoming quarterly earnings calls, analysts are already projecting higher recurring revenues tied to service agreements and device replacements.

Looking ahead, analysts expect the company to provide forward-looking revenue guidance that reflects the proTK deployment schedule, especially as Westinghouse begins marketing the platform to clients with near-term upgrade needs.

What historical context led Mirion Technologies and Westinghouse to seek digital instrumentation upgrades now?

Instrumentation and control systems in many existing reactors have seen only incremental upgrades over the past two decades, largely due to high capital costs and safety-related approval hurdles. However, recent shifts in regulatory posture and public-private investment have made modernization more feasible.

The legacy neutron flux drawers being replaced were originally developed in the mid-20th century, when analog signal processing dominated control systems engineering. Over time, maintenance costs, component obsolescence, and personnel training limitations have made these systems increasingly impractical to support.

Mirion’s proTK platform has existed in various commercial forms since the 1980s, but its integration into a comprehensive digital upgrade program with Westinghouse marks a new phase in its lifecycle. By enabling standardized upgrades with minimal operational disruption, the platform meets a pressing market demand for nuclear digital transformation.

What future milestones and deployments are expected following the Mirion–Westinghouse collaboration announcement?

The first set of installations under the new partnership is expected to begin in late 2025, with deployment timelines dependent on individual plant outage schedules and regulatory approvals. Westinghouse is expected to lead site-specific integration, while Mirion focuses on hardware delivery and long-term performance support.

Analysts are watching for updates in Mirion’s Q2 2025 earnings release, particularly around order backlog, signed service contracts, and early deployment revenue recognition. The scale and speed of adoption will serve as key indicators of how receptive the nuclear industry is to rapid digital modernization.

If early installations prove successful in reducing operational complexity and improving reliability, institutional investors anticipate that Mirion and Westinghouse may replicate this model across other reactor classes and additional instrumentation domains.

What are institutional investors and analysts saying about the strategic value of the Mirion–Westinghouse partnership?

Institutional investors view the Mirion–Westinghouse partnership as a strategically timed move to capture rising demand for digital modernization in nuclear infrastructure. Westinghouse’s exclusive marketing rights and Mirion’s track record with proTK installations offer a compelling value proposition for utilities. However, clarity on financial terms, deployment cadence, and post-installation performance will shape future sentiment.

How might deployment timelines and early results shape Mirion Technologies’ long-term growth outlook in nuclear modernization?

Analysts expect the digital rollout to begin in Q4 2025, with early results influencing further adoption across global fleets. Mirion’s ability to convert this opportunity into sustained earnings growth will depend on execution quality, pricing strategy, and after-market service uptake.