GB 27742-2011 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 27742-2011 | English | 130 |
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Activity concentration for material not requiring radiological regulation
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GB 27742-2011: Activity concentration for material not requiring radiological regulation---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB27742-2011
ICS 17.240
F 70
GB
National Standard
of the People’s Republic of China
Active concentration for material not requiring
radiological regulation
Issued on. DECEMBER 30, 2011
Implemented on. DECEMBER 1, 2012
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Determination basis of regulation-exempted concentration... 6
5 Regulation-exempted concentration value... 7
6 Application of regulation-exempted concentration... 8
7 Verification of meeting regulation-exempted concentration values... 10
Appendix A... 13
Appendix B... 18
Foreword
The contents of Chapter 4, Chapter 5, Chapter 6, 7.1, 7.4, 7.5, 7.7 of this
Standard are mandatory, the rest are recommended.
This Standard is formulated by referring to IAEA safety guide “Application of
the Concepts of Exclusion, Exemption and Clearance” (No. RS-G-1.7), and
combining the actual situations in China.
The Appendix A of this Standard is informative, the Appendix B is nominative.
This Standard was proposed by National Nuclear Corporation.
This Standard shall be administered by National Standardization Technical
Committee of Nuclear Energy (SAC/TC 58).
Main drafting organization of this Standard. Institute of Nuclear Industry
Standardization.
Main drafter of this Standard. Xia Yihua.
Active concentration for material not requiring
radiological regulation
1 Scope
This Standard specifies the active concentration for material not requiring
radiological regulation (hereinafter referred to as regulation-exempted
concentration).
This Standard applies to activities such as production operation, trade, landfill
or recycle of large amount (more than 1 ton) material. However, it does not
apply to the following conditions.
- Food, water, animal feed and any substances used in food or animal feed;
- Radon in the air (optimized action level of radon concentration in the air is
shown in Appendix H of GB 18871-2002);
- Material in transporting (managed according to transportation standard);
- Liquid and gas effluents generated by approved practice (they belong to the
scope of approved emission);
- Radioactive residues in the environment (including field soil).
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard,
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB 17567-2009 Clearance levels for recycle and reuse of steel, aluminum,
nickel and copper from nuclear facilities
3 Terms and definitions
The following terms and definitions apply to this Standard.
3.1
Material
The collective term of substances and materials, including large amount of
solid raw materials, auxiliary materials or materials intend to be deposed
involved in the activities such as production operation, trade, recycle and
landfill disposal.
3.2
Natural radionuclides
The radionuclides that is naturally existed in the earth with significant amount.
It mainly refers to the native radionuclides 235U, 238U, 232Th and theirs decay
daughter.
3.3
Exclusion
Outside the application scope of standard, it specifically refers to those
irradiation situations that can not control the irradiation size and possibility
through implementing the requirements of this Standard, such as the
irradiation caused by 40K in human body and the cosmic ray reaching to the
earth's surface.
3.4
Exemption
The practice and the source in practice that comply with the specified
exemption requirements and levels, and they are exempted from regulatory
requirements after agreed by the regulatory authorities.
4 Determination basis of regulation‐exempted concentration
4.1 Determination basis of regulation-exempted concentration for natural
radionuclides
4.2 Determination basis of regulation-exempted concentration for
artificial radionuclides
For materials containing artificial radionuclides, the criterion to determine
whether it can be exempted from radiological regulation is. the individual
effective dose caused by them is at the magnitude of 10 μSv/a, or less.
5 Regulation‐exempted concentration value
5.1 Regulation-exempted concentration value of natural radionuclides
The regulation-exempted concentration value of natural radionuclides is
shown in Table B.1.
5.2 Regulation-exempted concentration value of artificial radionuclides
The regulation-exempted concentration value of artificial radionuclides is
shown in Table B.2.
5.3 Regulation-exempted concentration value of inert gas
For inert gas, USE the exemption concentration for artificial radionuclides
given in Appendix A of GB 18871-2002 as regulation-exempted concentration.
5.4 Materials containing various of radionuclides
6 Application of regulation‐exempted concentration
6.1 Natural radionuclides
6.1.1 Under the premise that the legitimacy of activity of regulation-exempted
declaration is confirmed, any activity of which the active concentration for
natural radionuclides is less than or equal to the values listed in Table B.1, is
usually not required to conduct radiological regulation.
6.2 Artificial radionuclides
For the material in which the active concentration for artificial radionuclide is
not greater than the value listed in Table B.2, after approved by regulatory
authorities, the operation and use of this kind of material can be exempted
from regulation, that is these exempted and cleared materials can be
exempted from entering the practice protection system, unless the regulatory
authorities put forward special requirements to some special cases or special
uses.
6.3 Dose assessment
6.3.1 When it is determined that it is necessary to conduct dose assessment,
the dose criterion for regulatory authorities to determine whether it can be
exempted from regulation is.
6.3.2 For the situation of which the activity concentration exceeds the value
listed in Table B.1 and Table B.2, it is required to evaluate case-by-case
according to optimization principle. Based on the irradiation (or potential
irradiation) amount indicated in assessment results, it shall decide to put
forward radiological regulation requirements corresponding to the dangerous
level.
6.4 Material and equipment with contaminated surfaces
For those materials or equipment only with contaminated surfaces, they shall
be executed according to the specifications of B 2.2 in GB 18871-2002.
7 Verification of meeting regulation‐exempted concentration values
7.1 The basic and direct verification methods are to conduct laboratory
analysis of activity concentration to representative samples, it shall establish
and adopt qualified verification process for activity concentration value.
7.3 For the material only containing γ radionuclides, or the material in which
the relationship between its γ radioactivity level and the content of different
nuclides is clear, it is very convenient to adopt on-site screen of γ dose rate.
7.4 Regulatory authorities shall verify the sampling and measurement methods,
the quality assurance requirements of instrument configuration and verification
adopted by the application organization.
7.5 Before conducting the measurement of material, it shall classify different
kinds of materials, so as to let the composition and sources of same kind of
material remain close. When conducting direct measurement or sample
concentration analysis, tit shall ensure the representativeness of measurement
condition and sampling samples.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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