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Registration Number

0213U004339, 0113U005708 , R & D reports

Title

Determination of radioisotope composition and activity of special products in the central halls of blocks No. 1, 2, 3 which aren't subject to processing on LPD. Development of a technique for measurement of special products. Preparation of sentences concerning the treatment of them.

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Head

Maksimenko Andriy Mikhaylovich,

Registration Date

20-11-2013

Organization

Chornobyl Center; Center for monitoring projects in the field of nuclear and radiation safety and radioecology

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The measurement procedure (MP) for radiation parameters of special products (SP) in central halls of Units 1,2&3 was developed. With due regard to the Customer's requirements to the measurement objects and according to GOST 8.010-99, the following title of the procedure was proposed: "Measurement procedure for specific activity of activation nature radionuclides in structural material of special items. Delimitation of induced activity". The framework of the developed MP determined the algorithm to identify an induced activity limit determining preliminary radiation survey of special items with respect to presence of activation products by way of using the widespread method of equivalent dose rate dosimeter measurement with further estimation of activation products' specific activity (60Co, 55Fe, 59Ni, 63Ni) using transition coefficients. Based on the results of estimating radionuclides specific activity in SP structural material, an appropriate RAW category is assigned to SP fragments. An SP fragment with category 1 (low-level RAW) shall be subject to a more detail radiation survey with the location of an induced activity limit; to this end, samples of metal shall be taken throughout the length of a special product, then specific activity of the key radionuclide (60Co) shall be measured involving gamma-radiation spectrometry and further specific activity estimation for the difficult-to-measure radionuclides (55Fe, 59Ni, 63Ni) using transition coefficients. The induced activity limit shall be assigned at an SP sector where the specific activity of activation products is lower than the level of RAW exemption from the regulatory control.

Product Description

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Глигало Валерій Миколайович
Максименко Андрій Михайлович
Осколков Борис Яковлевич