Industry-Verified Manufacturing Data (2026)

Control Rod

Based on aggregated insights from multiple verified 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
    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
    Interface for connecting the rod to the drive mechanism or spider assembly for insertion/withdrawal.
    Material: Stainless steel
Engineering Reasoning
0-100% insertion depth, 0.1-5.0 m/s insertion/withdrawal speed, 20-400°C temperature range
Boron-10 burnup exceeding 60% (neutron absorption capacity loss), cladding temperature exceeding 600°C (Zircaloy-4 embrittlement), insertion force exceeding 50 kN (mechanical deformation)
Design Rationale: Neutron-induced transmutation of boron-10 to lithium-7 (burnup), hydrogen embrittlement of zirconium alloy at elevated temperatures (Zircaloy-4 degradation), yield strength exceedance of 304 stainless steel drive mechanisms (plastic deformation)
Risk Mitigation (FMEA)
Trigger Control rod drive mechanism hydraulic pressure loss below 10 MPa
Mode: Incomplete rod insertion (scram failure)
Strategy: Redundant electromagnetic latch backup system with 50 kN holding force
Trigger Neutron flux-induced swelling exceeding 2% volumetric expansion in boron carbide pellets
Mode: Rod jamming in guide tubes
Strategy: Annular gas gap design with 0.5 mm clearance and helium backfill at 0.3 MPa

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Control Rod.

boron carbide control rod for nuclear reactor silver indium cadmium alloy control rod specs hafnium control rod manufacturing equipment nuclear reactor control rod absorber section control rod cladding materials BOM

Applied To / Applications

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

Control Rod Assembly
View system integration details

Industrial Ecosystem & Supply Chain DNA

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

Verified manufacturers with capability to produce this product in China

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✓ 96% Supplier Capability Match Found

P Procurement Specialist from Australia Feb 24, 2026
★★★★★
"Testing the Control Rod now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
T Technical Director from Singapore Feb 21, 2026
★★★★★
"Impressive build quality. Especially the technical reliability is very stable during long-term operation."
Technical Specifications Verified
P Project Engineer from Germany Feb 18, 2026
★★★★★
"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Control Rod meets all ISO standards."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

13 sourcing managers are analyzing this specification now. Last inquiry for Control Rod from Brazil (1h ago).

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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 Specifications verified by CNFX Industrial Index (v2.6.03) for Machinery and Equipment Manufacturing sector.

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