On June 8, 2023, in accordance with Article 25 of the Law of Ukraine "On the Use of Nuclear Energy and Radiation Safety" and the Regulation on the State Nuclear Regulatory Inspectorate of Ukraine approved by Resolution No. 363 of the Cabinet of Ministers of Ukraine of August 20, 2014, the SNRIU issued an order to the State Enterprise NNEGC Energoatom to limit the operation of Zaporizhzhia NPP Unit 5 as an object of state supervision to the state of the reactor unit "cold shutdown".
The order was issued to the operating organization due to the impossibility of eliminating the identified violations of nuclear and radiation safety requirements, namely: paragraph 4. of Chapter 1. of Section 4 of the Requirements for Emergency Nuclear Fuel Cooling and Heat Removal Systems to the Final Absorber, approved by SNRIU Order No. 233 dated 24.12.2015, registered with the Ministry of Justice of Ukraine on 16 January 2016 under No. 77/28207.
The following factors were taken into account when adopting the order:
information from "Ukrhydroenergo" dated June 06, 2023 about the emptying of the Kakhovka reservoir in a few days as a result of the russian occupiers' blowing up of the Kakhovka HPP;
continued periodic shelling by the occupiers of the industrial site of the Zaporizhzhia NPP and surrounding areas, which damages the overhead lines of communication between the Zaporizhzhia NPP and the Ukrainian power system;
termination of data transmission from the ZNPP Automated Radiation Monitoring System (ARMS), which performs the function of early warning, starting from May 17, 2023;
degradation of the emergency response system at the ZNPP site and beyond under the temporary occupation of ZNPP, parts of Zaporizhzhya and Kherson regions by the russian federation.
" In the conditions of the loss of the main design source of splash pool feeding, it is necessary to immediately start transferring ZNPP Unit 5 to the cold shutdown state, while the design mode of operation of the necessary cooling systems is still maintained," the order says.
The restriction on the operation of Zaporizhzhia NPP Unit 5 will remain in effect until the identified violations are eliminated.
The presence of a permanent international IAEA mission at Zaporizhzhia NPP will help ensure compliance with safety requirements and monitor compliance with the basic safety principles proclaimed by IAEA Director General Rafael Grossi.
It is worth reminding that the operation of other ZNPP power units - Nos. 1, 2, 3, 4, 6 - is also limited to the cold shutdown state, in accordance with SNRIU orders of August 18, 2022 and February 10, 2023.