# Options for Solving the Problem of Parts of the Shelter Object Located Outside the New Safe Confinement

O. V. Balan, S. Gh. Brylka, V. V. Derengovskyi,
V. V. Yehorov, L. I. Pavlovskyi, V. M. Rudko,
D. O. Khomenko

Institute for Safety Problems of Nuclear Power Plants,
NAS of Ukraine, 36a, Kirova st., Chоrnobyl, 07270, Ukraine

DOI: doi.org/10.31717/2311-8253.20.4.7

### Abstract

The parts of the Shelter object structures remained outside the New Safe Confinement (protruding parts) are considered in the article. The analysis of the building structures condition of the turbine hall and the deaerator stack protruding parts on the east and west sides is carried out and the necessity of works on strengthening and/or dismantling of bearing structures is confirmed. Possible variants of reconstruction of the Shelter object protruding parts are stated and the technological sequence of works is provided. The analysis of the possibilities of performing works in the conditions of functioning of the New Safe Confinement — Shelter object system proved that such activity is rather difficult task, which can cause significant physical and financial costs. As there is no guarantee of trouble-free operation of the building structures of the protruding parts during the entire service life of the New Safe Confinement, it is necessary to make every effort to solve this problem in the short term.
The results of the analysis allow to choose the most advantageous solution to the goals and objectives for the safest and most cost/effective dismantling and/or strengthening of structures of protruding parts, taking into account a number of different criteria. These criteria may be different in nature, which allowed to build a generalized efficiency indicator for individual criteria with certain weights that determine the importance of each of the criteria for decision making.
Based on the results of the analysis, these options can be considered equivalent. The final decision on the choice of the optimal variant for the Shelter object protruding parts reconstruction can be made after detailing the technological decisions at the design stage of protruding parts reconstruction and before the design studies of the radiation condition in the work area.
The obtained information can be used as input data during the design of the reconstruction of the deaerator stack and the turbine hall parts of the Shelter object, which protrude beyond the New Safe Confinement.

Keywords: ChNPP, Shelter object, New Safe Confinement (NSC), protruding parts, multicriteria analysis, comparative analysis.

References

1. Rudko V. V., Balan O. V., Pavlovskyi L. I., Derenhovskyi V. V., Kaftanatina O. A., Brylka S. H., Pidbereznyi S. S. (2019). Participation in pre-project works on inspection of the condition of building structures
for the development of the project “Reconstruction of parts of the deaerator shelf and engine room of the Shelter object, protruding beyond the enclosing circuit of the NSC”. Stage 5. Analysis and determination of the most optimal variant of reinforcement and/or dismantling of parts, SO, protruding outside the NSC (HF SO), taking into account radiation doses and financial costs. Chornobyl. (in Ukr.)

2. Derengovskyi V. V. (2019). Udoskonalenyi metod bagatokryterialnogo analizu ekologichnoi bezpeky obiektiv iz radiatsiino-­yadernymy tehnologiiamy [The improved method of multicriteria analysis of environmental safety of objects with radiation and nuclear technologies] (PhD Thesis). Chornobyl: ISP NPP, NAS of Ukraine, 24 p. (in Ukr.)

3. Derengovskyi V. V., Rudko V. M., Govorov V. A. (2015). [Method of conducting a comparative analysis of “dosecost-benefit” for two options for “early” dismantling of unstable structures of the Shelter object]. Problemy bezpeky atomnykh elektrostantsii i Chornobylia [Problems of nuclear power plants safety and of Chornobyl], vol. 24, pp. 110–117. (in Ukr.)
4. The procedure for calculating current doses and potential exposure of personnel in the planning and design of work on the SO. Kyiv: Ministry of Health, 2004. (in Ukr.)

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Published
2020-12-16

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