GOST R 51713-2001
GOST R 51713−2001 Ingots of ferrous and nonferrous metals. Permissible levels of specific activity of gamma-emitting radionuclides. Method for radiation monitoring
GOST R 51713−2001
Group B09
STATE STANDARD OF THE RUSSIAN FEDERATION
Ingots of ferrous and nonferrous metals
PERMISSIBLE LEVELS OF SPECIFIC ACTIVITY OF GAMMA-EMITTING RADIONUCLIDES
Method for radiation monitoring
Ingots of ferrous and non-ferrous metals.
Permissible levels of specific activity of the radionuclides.
Method of radiation control
OKS 77.040.020
AXTU 0908
Date of introduction 2002−01−01
Preface
1 DEVELOPED by the Joint-stock company «EKOMET-With», Department of ecology and decommissioning of nuclear facilities of Minatom of the Russian Federation and State research center «tsniichermet im. I. P. Bardina"
MADE by the Department of ecology and decommissioning of nuclear facilities of the Russian Federation Ministry for atomic energy
2 ADOPTED AND put INTO EFFECT by the Resolution of Gosstandart of Russia from 15 February 2001 N 68th St
3 this standard implements the provisions of the Federal law of the Russian Federation «On radiation safety of population» (articles 3, 9, 11, 14)
4 INTRODUCED FOR THE FIRST TIME
1 Scope
1.1 this standard covers ingots of ferrous and non-ferrous metals, resulting from the smelting using scrap metal, including metal waste from nuclear power plants contaminated with radionuclides.
1.2 this standard specifies a method for radiation monitoring of ingots of ferrous and nonferrous metals to determine their compliance with the permissible levels of radioactivity.
2 Normative references
In this standard, reference the following standard:
GOST 7565−81 Iron, steel and alloys. Sampling method for determination of chemical composition
3 Definitions
In this standard use the following terms with respective definitions:
3.1 allowable levels: [1].
3.2 unlimited usage bars: the Use of metal without any restrictions.
4 Requirements
4.1 Specific activity of gamma-emitting radionuclides in the metal should not exceed the values given in [2], Annex 10.
4.2 dose rate of gamma radiation on the surface of ingots shall not exceed 0.2 µgy/h (0,2 µsv/h).
5 a Method for radiation monitoring
5.1 Radiation monitoring of ingots of metal is carried out according to certified methods using certified measuring instruments. Implementing radiation control should be a laboratory, accredited in the prescribed manner.
5.2 Radiation monitoring is carried out by measuring specific activity of gamma-emitting radionuclides in samples of melting metal by gamma-spectrometry. Mandatory is the measurement of absorbed dose rate of gamma radiation produced in air by the bullion resulting from the smelting of metal waste nuclear facilities contaminated with radionuclides.
6 measuring Tools and equipment
6.1 Radiometric unit based scintillation or semiconductor gamma-spectrometer with a bottom border of the measurement range of specific activity not exceeding 20% of the values given in [2], Annex 10.
6.2 the Dosimeter of gamma-radiation range of power measurement of ambient dose equivalent of 0.1 to 20 mSv/h (dose rate of 0.1 to 20 µgy/h), the basic error of measurement — ±20%, power range is from 0.05 to 3 MeV.
6.3 laboratory Scales with a weighing error of ±1 g.
7 the Procedure of control
7.1 the Measurement of specific activity of radionuclides in the metal is carried out using samples of melting metal selected in accordance with GOST 7565.
7.2 Measurement of gamma radiation should be carried out every single ingot of metal with dimensions of not less than 40x40 cm at the butt end and 30 cm in height.
7.3 carrying out measurements of dose rate of gamma radiation ingots in the package (the stack), provided that the package dimensions meet the requirements of the individual bars.
7.4 Measurement of dose rate of gamma radiation should be performed at a distance of not more than 2 cm from the surface of the ingot in the middle of each end and side surfaces at least at two points located on opposite sides relative to the longitudinal axis of the ingot. For the bars of a height > 60 cm measurement on side surface is performed at points spaced from each other along the height of the ingot by not more than 30 cm For non-cylindrical ingots of the shape of the measurement should be carried out with all sides of the ingot.
7.5 the Decision on conformity of the ingot standard accepted in the case that the result of measurement of the specific activity of the metal with the absolute error of measurement corresponds to 4.1. When measuring the dose in accordance with 7.2−7.4 any of the results of measurements of dose rate of gamma radiation contained in the ingot of the radionuclides must not exceed prescribed in 4.2.
8 making the results of the measurements
The inspection draw up an official document (certificate, certificate, certificate, Protocol, etc.) containing:
— the date and number of melt, the cipher of metal;
— the date of the inspection;
the results of measurements;
— conclusion about compliance of the ingots with the requirements of this standard.
9 safety Requirements
Requirements for radiation safety are established in the Basic sanitary regulations ensuring radiation safety (OSPORB) and the radiation safety Standards (NRB-99).
Annex a (informative). Bibliography
APPENDIX A
(reference)
[1] SP 2.6.1.758−99 norms of radiation safety
[2] SP 2.6.1799−99* Basic sanitary rules for ensuring radiation safety
_________________
* Probably, the error of the original. Should read SP 2.6.1.799−99. — Note the CODE.
The text of the document is verified by:
the official publication of the
M.: IPK Publishing house of standards, 2001
