Structured Manufacturing Data (2026)

Control Rod

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Control Rod used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Control Rod is characterized by the integration of Absorber Section and Cladding. In industrial production environments, manufacturers listed on CNFX commonly emphasize Boron carbide (B4C) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A neutron-absorbing rod used to regulate the nuclear fission reaction rate in a nuclear reactor.

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Product Specifications

Technical details and manufacturing context for Control Rod

Definition

A control rod is a critical safety component within a nuclear reactor's control rod assembly, designed to absorb neutrons and thereby control the rate of the nuclear chain reaction. Its insertion or withdrawal from the reactor core directly modulates reactor power and is essential for startup, operation, and emergency shutdown.

Working Principle

Control rods contain materials with high neutron absorption cross-sections (neutron poisons), such as boron, cadmium, silver, indium, or hafnium. When inserted into the reactor core, they absorb free neutrons, reducing the number available to cause fission and thus slowing or stopping the chain reaction. Withdrawal has the opposite effect, allowing the reaction to proceed.

Common Materials

Boron carbide (B4C), Silver-indium-cadmium alloy, Hafnium

Technical Parameters

Diameter and length are critical for fit within the guide tubes and effective neutron absorption coverage in the core. (mm) Per Request

Components / BOM

Absorber Section
Contains the neutron-absorbing material (poison) that regulates the fission reaction.

Material: Boron carbide pellets or alloy
Cladding Part
Hermetically seals and provides structural support for the absorber material, protecting it from the reactor coolant environment.

Material: Stainless steel or Zircaloy
End Fittings/Connectors Part
Interface for connecting the rod to the drive mechanism or spider assembly for insertion/withdrawal.

Material: Stainless steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Control Rod.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Control Rod Assembly

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Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits

pressure:	7-15 MPa (PWR), 7-8 MPa (BWR)
other spec:	Neutron absorption cross-section: 100-2000 barns, Insertion/withdrawal speed: 0.1-10 cm/sec
temperature:	300-600°C (typical PWR/BWR operating range)

Media Compatibility

✓ Pressurized Water Reactor coolant (borated water) ✓ Boiling Water Reactor steam environment ✓ Liquid metal cooled reactor (sodium)

Unsuitable: High-temperature molten salt with fluoride ions (corrosive to cladding)

Sizing Data Required

Reactor thermal power output (MWth)
Reactor core height and fuel assembly pitch
Required reactivity worth (Δk/k)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Stress corrosion cracking

Cause: Exposure to corrosive reactor coolant combined with tensile stresses from operational loads and residual stresses from manufacturing/installation

Wear and galling

Cause: Friction between control rod surfaces and guide tubes during insertion/withdrawal cycles, exacerbated by misalignment, insufficient lubrication, or material incompatibility

Maintenance Indicators

Abnormal insertion/withdrawal resistance or irregular movement patterns during reactor scram tests
Visible corrosion, pitting, or discoloration on exposed rod surfaces during in-service inspections

Engineering Tips

Implement strict water chemistry control to minimize corrosive agents in reactor coolant, combined with regular non-destructive testing (eddy current, ultrasonic) to detect early-stage cracking
Maintain precise alignment of guide tubes and drive mechanisms, use compatible wear-resistant materials, and establish proper lubrication protocols where applicable

Compliance & Manufacturing Standards

Reference Standards

ISO 9001:2015 - Quality Management Systems ASTM A276/A276M-17 - Standard Specification for Stainless Steel Bars and Shapes ASME BPVC Section III - Rules for Construction of Nuclear Facility Components

Manufacturing Precision

Diameter: +/-0.01mm
Surface Roughness: Ra 0.8μm

Quality Inspection

Ultrasonic Testing (UT)
Hardness Testing (Rockwell C)

Factories Producing Control Rod

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What materials are used in control rod manufacturing?

Control rods are primarily made from neutron-absorbing materials like boron carbide (B4C), silver-indium-cadmium alloy, or hafnium, with cladding for protection and end fittings for connection.

How do control rods regulate nuclear fission?

Control rods absorb neutrons in the reactor core, adjusting the neutron population to control the fission chain reaction rate, ensuring stable and safe reactor operation.

What are the key components in a control rod BOM?

The bill of materials includes the absorber section (neutron-absorbing material), cladding (protective outer layer), and end fittings/connectors for secure installation and operation.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

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