Editorial Technical Reference

Guide Tube

This page explains how Guide Tube is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A precision tubular component that provides a controlled pathway for control rods within a nuclear reactor core.

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Product Specifications

Technical details and manufacturing context for Guide Tube

Definition

The Guide Tube is a critical structural component of the Control Rod Assembly in nuclear reactors. It serves as a protective housing and alignment mechanism that ensures the control rods move smoothly and precisely along their designated paths during insertion and withdrawal operations. The tube maintains proper spacing and prevents rod vibration or misalignment that could compromise reactor safety and control. Constructed from materials such as zirconium alloys (e.g., Zircaloy-4), stainless steel (316L), or Inconel alloys, the Guide Tube is designed to withstand the demanding conditions inside a reactor core. Its internal surfaces may feature specialized coatings or liners to minimize friction and wear, ensuring reliable operation over the component's service life. The tube's rigid structure maintains geometric integrity under thermal and mechanical stresses, ensuring the control rods follow their intended trajectory without binding or deviation. The inner diameter tolerance is typically ±0.05 mm to ensure precise control rod clearance, but this value must be verified for the specific model and application. As a directory listing, this information serves as a general reference; procurement and verification should be conducted with the legal manufacturer or supplier to confirm exact specifications, material grades, and applicable standards. The Guide Tube is essential for reactor control and safety, and its performance directly impacts the reliability of the control rod system.

Working Principle

The Guide Tube creates a low-friction, precisely aligned channel through which control rods travel. It typically features internal surfaces with specialized coatings or liners to minimize friction and wear. The tube's rigid structure maintains geometric integrity under thermal and mechanical stresses, ensuring the control rods follow their intended trajectory without binding or deviation. The inner diameter tolerance is typically ±0.05 mm to ensure precise control rod clearance, but this value must be verified for the specific model and application.

Common Materials

Zirconium alloy (e.g., Zircaloy-4), Stainless steel (316L), Inconel alloys

Technical Parameters

What to specify in your RFQ

Inner diameter tolerance typically ±0.05mm to ensure precise control rod clearance in mm

These are the quantities to specify to the manufacturer when sizing or requesting a quote. The manufacturer's own documentation governs the exact figures and applicable standard.

Components / BOM

Tube Body Part
Primary structural element providing the guide channel

Material: Zirconium alloy
Internal Liner/Coating Part
Reduces friction and wear between tube and control rod

Material: Hard chrome plating or ceramic coating
Mounting Flange Part
Secures the guide tube to the reactor structure

Material: Stainless steel

Applied To / Applications

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

Control Rod Assembly

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Manufacturers of Guide Tube

Manufacturer profiles associated with Guide Tube.

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Frequently Asked Questions

What is the primary function of a Guide Tube?

The Guide Tube provides a controlled pathway for control rods within a nuclear reactor core, ensuring they move smoothly and precisely during insertion and withdrawal, maintaining proper spacing and preventing vibration or misalignment.

What materials are commonly used for Guide Tubes?

Common materials include zirconium alloys (e.g., Zircaloy-4), stainless steel (316L), and Inconel alloys. The specific material grade depends on the reactor design and operating conditions.

What is the typical inner diameter tolerance for a Guide Tube?

The inner diameter tolerance is typically ±0.05 mm to ensure precise control rod clearance. However, this value is a reference and must be confirmed for the specific model and application with the manufacturer.

How does the Guide Tube contribute to reactor safety?

By maintaining precise alignment and preventing rod vibration or misalignment, the Guide Tube ensures reliable control rod movement, which is essential for reactor control and safety.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	15-16 MPa (PWR) / 7-8 MPa (BWR)
other spec:	Neutron flux tolerance: 10^13 to 10^14 n/cm²·s, Flow rate: 0.5-2 m/s coolant velocity
temperature:	300°C to 400°C (typical PWR/BWR operating range)

Guide Tube

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards