KNT-HMS-1 Nuclear Power Plant Containment Hydrogen Concentration Monitoring System

The KNT-HMS Nuclear Power Plant Containment Online Hydrogen Concentration Monitoring System is the result of close collaboration between our company and domestic nuclear power users, built on our palladium-alloy hydrogen sensor technology. Designed specifically for the third-generation Hualong One and CAP1000 reactor types, the system fully complies with NB/T 20098—2024, *Design Criteria for Containment Hydrogen Control Systems in Pressurized Water Reactor Nuclear Power Plants*. Its design addresses the protection requirements of both design-basis accidents and design extension conditions, providing nuclear power plants with a critical hydrogen-monitoring barrier as part of their defense-in-depth safety strategy.

Product Features

100% Proprietary Intellectual Property, Breaking Technological Monopolies

As a fully domestically developed high-end system, all core components—including radiation-resistant sensor probes, high-interference-immunity signal transmission modules, and intelligent analysis units—are independently developed and manufactured. The system is specifically optimized for the containment structures and hydrogen diffusion characteristics of domestic reactor types, effectively addressing critical challenges associated with imported equipment, including poor compatibility, high operation and maintenance costs, and data security risks.

Intelligent Edge Computing with Millisecond-Level Response

Deeply integrated with intelligent nuclear power technology, the system incorporates proprietary algorithms capable of capturing millions of data fluctuations per second. Edge computing enables real-time anomaly alerts with data transmission latency of no more than one second. The system integrates seamlessly with nuclear power plant DCS control systems and intelligent operation and maintenance platforms, providing operators with accurate situational awareness.

High-Safety Redundant Design

Strictly following the redundancy design principles for nuclear power equipment, the system adopts dual-redundant configurations for critical sensing units, power supply modules, and signal links. Its seismic and safety classifications meet the highest standards for third-generation nuclear power plants. With single-failure tolerance, the system ensures uninterrupted monitoring even under extreme operating conditions.

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Product Details

Product Specifications

The KNT-HMS Nuclear Power Plant Containment Online Hydrogen Concentration Monitoring System is the result of close collaboration between our company and domestic nuclear power users, built on our palladium-alloy hydrogen sensor technology. Designed specifically for the third-generation Hualong One and CAP1000 reactor types, the system fully complies with NB/T 20098—2024, Design Criteria for Containment Hydrogen Control Systems in Pressurized Water Reactor Nuclear Power Plants. Its design addresses the protection requirements of both design-basis accidents and design extension conditions, providing nuclear power plants with a critical sensing barrier as part of their defense-in-depth safety strategy.

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Measurement Range	0–30 vol.%
Accuracy	±2% F.S.
Post-Accident Accuracy	±2% F.S.
Drift	0.3% F.S./24 h or ±3% F.S./year
Response Time	60 s (T90)
Explosion-Proof Rating	Ex d IIC T6 Gb
Output Signal	4–20 mA analog signal and switching fault signal
Power Supply	220 VAC, 50 Hz
Total Power Consumption	≤0.3 kW
Equipment Classification	D
Safety Class	Non-IE
Seismic Classification	Class II; functional after SSE
Quality Assurance Class	QRA1
Ingress Protection Rating	IP65
Service Life	60 years (with normal maintenance)
Severe Accident Operating Duration	1 year

A. Normal Environmental Conditions
Equipment	Normal Temperature	Normal Pressure	Relative Humidity	60-Year Cumulative Dose
Hydrogen Sensor	10°C–49°C	−1.4 kPa to 6.9 kPa(g)	20%–80% RH	330 Gy
Monitoring Cabinet	10°C–40°C	Slight Positive Pressure	20%–80% RH	<10 Gy

B. Design-Basis Accident (DBA) Environmental Conditions
Equipment	Abnormal Conditions	Duration	Ambient Temperature	Ambient Pressure	Relative Humidity	60-Year Cumulative Dose
Hydrogen Sensor	18 occurrences over 60 years	4 h each, 72 h total	66°C	≤13.8 kPa	95% RH	330 Gy
Hydrogen Sensor	5 occurrences over 60 years	30 days	Heating to 121°C within 5 min, repeated 5 times (25 min total); maintained at 121°C for 72 h; then linearly reduced from 121°C to 66°C within 24 h and maintained at 66°C for approximately 26 days	103.4 kPa	95% RH	330 Gy
Monitoring Cabinet	10 occurrences over 60 years	4 h each, 40 h total	50°C	Same as normal operating conditions	Same as normal operating conditions	<10 Gy
Note: The radiation dose under abnormal DBA conditions is the same as that under normal environmental conditions.

C. Severe Accident (BDBA) Environmental Conditions
Equipment	Temperature	Pressure	Humidity	Radiation Dose
Hydrogen Sensor	180°C	467.8 kPa	98%	Gamma (γ): 474 kGy; Beta (β): 3,160 kGy

KNT-HMS-1 Nuclear Power Plant Containment Hydrogen Concentration Monitoring System

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