On August 2, 2013, the State Nuclear Regulatory Inspectorate of Ukraine has issued to SSE ChNPP a separate permit of ОД No.000033/7 series to perform works on commissioning of New Ventilation Stack (NVS) of ChNPP Stage II.

Pursuant to this permit, the NVS will be commissioned in accordance with “Decision on Commissioning of New Ventilation Stack of SSE ChNPP Stage II” and “Program of Commissioning of New Ventilation Stack and Relevant Systems of SSE ChNPP Stage II” approved on July 4, 2013.

During work performance on NVS commissioning, the SSE ChNPP should provide permanent control for volumetric activity of air around Shelter Object when changing the ventilation system modes and closing ventilation stack VS-2 orifice, and following completion of NVS pilot operation stage, ensure compliance with a criterion of air flow rate through Shelter Object bypass.

For information. As far as available ventilation stack of ChNPP Stage II (VS-2) impedes the arrangement of NVS eastern end wall, the activities on constructing new ventilation stack with simultaneous partial reconstruction of available ventilation systems and radiation monitoring system were started in 2010 to make provision for consumers of Unit 3, Liquid and Solid Radwaste Storage Facility and Shelter Object (following VS-2 dismantling). The NVS commissioning should take precedence of VS-2 dismantling commencement.