ISO 18213-4:2008 PDF

Nuclear fuel technology — Tank calibration and volume determination for nuclear materials accountancy — Part 4: Accurate determination of liquid height in accountancy tanks equipped with dip tubes, slow bubbling rate

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Title (English):

ISO 18213-4:2008

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 21
Publication date:: March 10, 2008
Edition:: ISO IS 18213 edition 1 version 1
ICS:: 27.120.30

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Description (English):

ISO 18213-4:2008 specifies a procedure for making accurate determinations of the liquid height in nuclear-materials-accountancy tanks that are equipped with pneumatic systems for determining the liquid content. With such systems, gas is forced through a probe (dip tube) whose tip is submerged in the tank liquid. The pressure required to induce bubbling is measured with a manometer located at some distance from the tip of the probe. This procedure applies specifically when a very slow bubbling rate is employed.

Technical details

Technical committee: ISO/TC 85/SC 5 - Nuclear installations, processes and technologies
SKU: ISO 18213-4:2008

Abstract

Overview

ISO 18213-4:2008 - part of the ISO 18213 series on nuclear fuel technology - specifies a validated procedure for accurately determining liquid height in nuclear-materials-accountancy tanks that use bubbler (dip tube) systems. It applies specifically to systems operated at a very slow bubbling rate, where gas is forced through a submerged probe and the induced pressure is measured with a manometer. The standard links hydrostatic pressure measurements to height (P = g·ρ·H) and describes how to convert pressure readings into reliable height values for tank calibration and inventory accountancy.

Key Topics and Requirements

Scope and purpose: Accurate height determinations for tank calibration and volume measurement in nuclear materials accountancy.
Physical principles: Use of hydrostatic relation P = g·ρ·H; impacts of liquid density (ρ), gravity (g) and temperature.
Measurement system components: Dip tubes (major and reference probes), manometer, gas supply, flowmeters and recording equipment.
Slow bubbling conditions: Guidance on maintaining very low, steady bubble rates (example: ~2–4 bubbles/min for a 15 mm probe as referenced).
Pressure-to-height conversion: Procedures for differential-pressure measurement, sensor calibration drift, buoyancy and gas-column mass corrections.
Bubbling overpressure: Identification and correction of the positive bias (overpressure) produced at the maximum pressure in the bubble formation cycle; calculation guidance is provided (see Clause 4.4 and informative Annex B).
Operating procedures and uncertainty: Recommended operating steps and annexed material on estimating quantities that affect height determination and measurement uncertainty (Annex A and C).

Applications and Users

ISO 18213-4:2008 is intended for professionals and organizations involved in:

Nuclear materials accountancy and safeguards (facility accountants, safeguards inspectors).
Tank calibration engineers and metrology teams in reprocessing and fuel fabrication plants.
Process control and quality assurance in nuclear fuel technology where accurate liquid-volume measurement is critical.
Regulatory bodies, auditors and technical experts who require standardized, traceable methods for converting bubbler pressure readings to liquid height and volume.

Related Standards

Part of the ISO 18213 series - relevant documents include:

ISO 18213-1: Procedural overview
ISO 18213-2: Data standardization for tank calibration
ISO 18213-3: Statistical methods
ISO 18213-5: Fast bubbling rate procedures
ISO 18213-6: In-tank determination of liquid density

ISO 18213-4:2008 supports robust, repeatable tank calibration and inventory calculations by standardizing pressure-based liquid height measurement under slow bubbling conditions. Keywords: ISO 18213-4:2008, nuclear fuel technology, tank calibration, liquid height determination, dip tube, slow bubbling rate, bubbler system, nuclear materials accountancy.

Related standards

Standards mentioned in the description

Abstract

Overview

Key Topics and Requirements

Scope and purpose: Accurate height determinations for tank calibration and volume measurement in nuclear materials accountancy.
Physical principles: Use of hydrostatic relation P = g·ρ·H; impacts of liquid density (ρ), gravity (g) and temperature.
Measurement system components: Dip tubes (major and reference probes), manometer, gas supply, flowmeters and recording equipment.
Slow bubbling conditions: Guidance on maintaining very low, steady bubble rates (example: ~2–4 bubbles/min for a 15 mm probe as referenced).
Pressure-to-height conversion: Procedures for differential-pressure measurement, sensor calibration drift, buoyancy and gas-column mass corrections.
Bubbling overpressure: Identification and correction of the positive bias (overpressure) produced at the maximum pressure in the bubble formation cycle; calculation guidance is provided (see Clause 4.4 and informative Annex B).
Operating procedures and uncertainty: Recommended operating steps and annexed material on estimating quantities that affect height determination and measurement uncertainty (Annex A and C).

Applications and Users

ISO 18213-4:2008 is intended for professionals and organizations involved in:

Nuclear materials accountancy and safeguards (facility accountants, safeguards inspectors).
Tank calibration engineers and metrology teams in reprocessing and fuel fabrication plants.
Process control and quality assurance in nuclear fuel technology where accurate liquid-volume measurement is critical.
Regulatory bodies, auditors and technical experts who require standardized, traceable methods for converting bubbler pressure readings to liquid height and volume.

Related Standards

Part of the ISO 18213 series - relevant documents include:

ISO 18213-1: Procedural overview
ISO 18213-2: Data standardization for tank calibration
ISO 18213-3: Statistical methods
ISO 18213-5: Fast bubbling rate procedures
ISO 18213-6: In-tank determination of liquid density

ISO 18213-4:2008 PDF

Technical details

Abstract

Overview

Key Topics and Requirements

Applications and Users

Related Standards

Related standards

Abstract

Overview

Key Topics and Requirements

Applications and Users

Related Standards

Related standards

Nuclear fuel technology — Tank calibration and volume determination for nuclear materials accountancy — Part…

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