Large RW Containers
The Engineering Proposal was worked out to extract RW within the implementation of the project dedicated to extraction of military radioactive waste (RW) from the Tsybuleve landfill, and according to the results obtained during the repository survey. This solution was agreed in due course with the State Nuclear Regulatory Inspectorate of Ukraine. According to the RW extraction technology foreseen in the Engineering Proposal, defragmentation would be minimized for wells and their structural elements due to its potential hazard to the personnel and the environment by creating, in turn, objects classified as large and heavy RW. Based on computing models for radionuclide activity distribution in repository wells, corresponding RW were classified as LSA-1 (low levels of safety assurance, 1st group). The corresponding approach was supported by the experts of the State Scientific and Technical Centre for Nuclear and Radiation Safety. At the same time, they mentioned the need to characterize RW after their extraction from the Tsybuleve landfill, in particular, to justify the safety when disposing these RW. That is why it is necessary to place RW to temporary storage in due certified packaging sets intended for RW storage before making a reasonable decision regarding their safe disposal. Appropriate requirements have been set for similar packaging complexes. According to them, a packaging set should retain its protective properties for the period at least 15 years under environmental impacts.
It was also stated that “historical” RW should be disposed of in packaging sets, which compliance was confirmed with the Technical Regulation for Packaging Complexes for RW Storage approved by Ordinance of the Cabinet of Ministers of Ukraine as of 17 October 2018, Re. No. 884.
Therefore, there is a need to design, manufacture and certify special containers to store “historical” RW.
According to the technical requirements formed, the Design Assignment was worked out for a packaging set, which considered all requirements. Based on the Design Assignment formed, design documentation was worked out for PK-20-1SS (ПК-20-1СС) packaging set for RW storage. Packaging sets were made of 20-feet 1CC marine cargo containers certified for their compliance with the standard adopted by the International Convention for Safe Containers (ISO 1496-1).
The sets are additionally equipped with steel floor at least 3 mm thick and the 255х155 mm additional hatch located on the side wall opposite to end doors. The compliance of the purchased 20-feet 1CC marine cargo containers with the requirements of the standard adopted by the International Convention for Safe Containers was confirmed by certificates issued by the “Bureau Veritas” Conformity Assessment Body.
Three packaging sets were started to manufacture according to the design document suite worked out by NT ENGINEERING. Quality control was carried out during the whole production period according to a specially designed quality control schedule.
Engineers of NT ENGINEERING have designed a special dumping frames for large RW fragments, which were produced together with containers, to ensure additional safety during RW handling and transportation.
The certification procedure was started for packaging sets together with the manufacturing process for their compliance with the Technical Regulation for Packaging Complexes for RW Storage. We have forwarded the certification application and corresponding document suite to OOS CERTATOM, a certified Compliance Assessment Body (CAB).
We have taken the following actions to comply with certification requirements:
- The testing procedure and schedule were worked out and agreed with the CAB
- The Packaging Set Operation Manual was prepared
- The QC program during manufacturing was agreed before the beginning of the packaging set production
- We have tested the quality of materials used at the laboratory, namely, chemical composition of steel used to manufacture 20-feet containers. Deactivation factor was measured for the paint coat of 20-feet containers
- The quality was confirmed for the materials purchased for additional equipment of 20-feet containers according to the requirements of the Technical Regulation (certificates and laboratory test reports)
- A factory trial complex was carried out for containers, and packaging set data sheets were issued prior to certification tests
Production of 3 packaging sets was finished in March 2020. Packaging sets were moved to the work site.
Packaging sets were tested at the work site on 31 March 2020 according to the agreed Testing Procedure and Schedule. The test was carried out with witness of representative of OOS Certatom and Independent Test Laboratory ATOM KOMPLEX PRYLAD.
During the testing, the compliance of packaging sets was checked with set requirements by the following parameters:
- External examination and compliance with drawings
- Material quality check
- Completeness check
- Labelling check
- Weight and dimensional check
According to certification test results, the compliance was set for packaging sets with the requirements of the Technical Regulation for Packaging Complexes for RW Storage and Disposal approved by Ordinance of the Cabinet of Ministers of Ukraine as of 17 October 2018, Ref. No. 884 and Design Assignment for Manufacturing Packaging Set ПК-20-1СС-00.00.000 ТЗ.
Based on positive results of certification tests, OOS Certatom issued Compliance Certificate No. UA.TR.106.03612–20 (valid since 9 April 2020) for PK-20-1SS packaging sets manufactured by NT-Engineering, serial Nos. 1, 2, 3.
According to the requirements of the Licensing Agreement for RW Processing, the Contractor informed the State Nuclear Regulatory Inspectorate of Ukraine about the conformity assessment results for packaging sets and forwarded the Design Assignment for Manufacturing Packaging Set ПК-20-1СС-00.00.000 ТЗ for its approval. The corresponding Design Assignment was agreed by letter as of 16 April 2020, Ref. No. 24-29/5391-5860.
Thus, NT-Engineering has designed and manufactured packaging sets for storing large “historical” RW for the first time in Ukraine.