Nuclear Power Plant Instrumentation Cables segmentation by Application isolates four usage clusters: Reactor Core Monitoring, Safety Systems, Power Distribution, and Communication & Data. Reactor Core Monitoring cables link temperature, neutron flux, and pressure sensors directly to the control room; they dominate the market with an estimated 40% share because of the high safety criticality and regulatory oversight. Safety Systems cables support emergency shutdown, containment isolation, and fire‑detection networks, contributing roughly 30% of demand, driven by mandatory redundancy and periodic testing requirements. Power Distribution cables interconnect auxiliary power units, cooling pumps, and instrumentation panels, representing about 20% of market size, reflecting the need for robust, radiation‑resistant conductors. Finally, Communication & Data cables facilitate plant‑wide Ethernet, fiber‑optic, and telemetry links, accounting for the remaining 10% as digitalization initiatives expand. This application‑focused taxonomy clarifies how each segment underpins overall market growth and investment priorities.