Some Aspects of Practical Application of Regulatory Requirements Related to Operating and Seismic Load Combinations for Thermomechanical Equipment and Piping
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Keywords

load combinations, seismic resistance, thermomechanical equipment, pipelines, calculation, operating basis earthquake, safe shutdown earthquake.

How to Cite

Shugaylo, O.- r., Ryzhov, D., Mustafin, M., Pidhaietskyi, T., & Letkova, N. (2019). Some Aspects of Practical Application of Regulatory Requirements Related to Operating and Seismic Load Combinations for Thermomechanical Equipment and Piping. Nuclear and Radiation Safety, (4(84), 5-11. https://doi.org/10.32918/nrs.2019.4(84).01

Abstract

New state-of-the-art regulatory document has been developed and implemented in Ukraine to present requirements for seismic hazard assessment of nuclear power plant (NPP) sites and seismic resistance of nuclear power units taking into account lessons learnt from the accident at Fukushima-1 NPP. One of the new important regulatory requirements in this document is the extension of the list of mandatory load combinations, which should be considered in assessing seismic resistance of unit components.

Advantages and disadvantages of the algorithm proposed by the operating organization to determine the necessity to consider some load combinations in assessing the seismic resistance of pipelines and thermomechanical equipment based on previously performed seismic strength calculations have been analyzed in the paper. The pipelines as well as the thermomechanical equipment of Zaporizhzhya NPP Unit 3, for which seismic strength evaluation was calculated, have been considered.

The results of expert seismic calculations of YP13S02 valve of ZNPP-1 and ZNPP-3 have been provided. The paper presents the comparative analysis of the floor response spectra for the lower, middle and high elevations of ZNPP-3 containment with the corresponding floor response spectra of other Ukrainian NPPs and conclusions.

The possibility for disseminating results obtained by the operating organization for ZNPP-3 to other units of the Ukrainian NPPs has been analyzed.

https://doi.org/10.32918/nrs.2019.4(84).01
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References

1. NP 306.2.208-2016. Requirements for seismic resistance design and for evaluation of seismic safety of Ukrainian NPPs. Approved by SNRIU Order No. 175 dated 17 October 2016 registered in the Ministry of Justice on 11 July 2016 under No. 1449/29579 [in Ukrainian].

2. PNAE G-5-006-87. Standards for design of seismic-resistant nuclear power plants. Мoscow, Energoatomizdat, 1989, 29 [in Russian].

3. Ryzhov., D., Shugaio, O-i., Shugaylo, O-r. , Kendzera, O., Maryenkov, M., Shenderovich, V., Buryak, R. (2017). About modern requirements for seismic resistance design and for evaluation of seismic safety of Ukrainian NPP units. Nuclear and Radiation Safety, 2(74), 9 – 13 [in Ukrainian].

4. NS-G-1.6. Seismic design and qualification for nuclear power plants. Vienna, 2003.

5. Organizational and technical measures of Energoatom for implementation of NP 306.2.208-2016 «Requirements for seismic design and seismic safety assessment of NPPs». Kyiv, Energoatom, 2017 [in Russian].

6. Comparative analysis of the calculated load combinations for building structures, several groups of equipment according to requirements of PNAE G-5-006-87 and NP 306.2.208-2016. Kyiv, Energoatom, 2018 [in Russian].

7. Report on the State review of nuclear and radiation safety of Energoatom document «Comparative analysis of the calculated load combinations for building structures, several groups of equipment according to requirements of PNAE G-5-006-87 and NP 306.2.208-2016» (registration No. 19-09-11489). SSTC NRS, 2019 [in Ukrainian].

8. Comprehensive (Integrated) Safety Improvement Program for Ukrainian NPPs. Approved by the Resolution of the Cabinet of Ministry of Ukraine No. 1270 dated 07 December 2011 [in Ukrainian].

9. List of Zaporizhzhya NPP Unit 3 equipment, piping, building structures for which substantiation of seismic resistance should be performed. Approved by SNRIU on 02 December 2014 [in Russian].

10. PNAE G-7-002-86. Standards for strength calculations of equipment and piping of nuclear power installations. Moscow, Energoatomizdat, 1989, 454 [in Russian].