TACIS Project R 8 0198 TRANSLATION EDITING AND

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project General Data F Beneficiary: Rosenergoatom F Contractors: Siemens-KWU F Local Subcontractor: MOKHT F Sector of activities: Design Safety F Sites: VVER 1000 F Installations: VVER 1000 (Type 320) F Status: Completed F Budget: 229 000 € F Duration: 12 months Slide 1 Rev. : 15. 8. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project Objectives of the Project F To analyze the Russian Fission Product Retention System (FPR) during discharge of steam-gas mixture from a VVER-1000 –V 320 Containment under accidents with rupture of the primary circuit pipe and simultaneous NPP black out F To compare Russian and Western FPR-design F To create an upgraded Russian basic design of a FPR F To review and adapt compliance with current Russian requirements Slide 2 Rev. : 15. 8. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project Scope of the Project (1) The project covers the following phases: 1. Creation of a project related Quality Assurance Programme 2. Evaluation of the status in development of Russian FPR systems 3. Evaluation of the status in development of EU-FPR systems 4. Comparison of the 2 FPR systems 5. Determination of respective Emergency scenarios for VVER-1000 Slide 3 Rev. : 15. 8. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project Scope of the Project (2) 6. Selection of a General concept for a FPR system 7. Development of a Process Diagram of the FPR system 8. Development of the System Description 9. Development of the Design Report of the FPR system 10. Development of Diagrams of the FPR-System Layout 11. Development of the List of Design data Slide 4 Rev. : 15. 8. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project Details on Selected Project Tasks (1) Status of FPR development in the Soviet Union / its basis for upgrade: • In 1998 a system has been started to be developed • The designer was NIIKh. IMMASh in Sverdlovsk (Ekaterinburg) • In 1989 a FPR-system has been introduced (sketches, system concept defined) • The concept has been tested experimentally on a large scale mock up • In 1993 all further works were suspended in Russia Slide 5 Rev. : 15. 8. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project Details on Selected Project Tasks (2) The status of FPR-development in the EU: EU-FPR Systems use • dry filters, metal fiber filters in combination with molecular sieve, operating under atmospheric conditions • metal fiber filters in combination with molecular sieve, operating under varying pressure conditions • Sand filters • Scrubber-type retention systems • Different Western variations were analysed concerning weight, cost and effectiveness Slide 6 Rev. : 15. 8. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project Details on Selected Project Tasks (3) Comparison criteria, which where generally considered essential: • • • Aerosols retention rate; Elemental iodine retention rate; Organic iodine retention rate; Reverse sublimation; Passivity of the system; Aerosol load capacity; Restrictions in operation; National qualification; International qualification; Dimensions; Potential for general usage for several NPP units. Slide 7 Rev. : 15. 8. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project Details on Selected Project Tasks (4) Criteria, which where considered essentially for design of VVER-1000 -FPR: Operational modes for the FPR-system project have been determined taking into consideration the following main parameters: • • design pressure; mass flow rate through the system; retention rate; residual power density accumulated inside the system; aerosol load capacity; aerosols spectrum; period of passive operation. Slide 8 Rev. : 15. 8. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project Details on Selected Project Tasks (5) Selection of a general concept for a FPR system for VVER-1000 The performed cost-benefit-analysis proved, that the Sliding Pressure Venturi Scrubber has best characteristics among scrubber types because of: • Equal retention rates of Aerosols and Iodine • This is the only scrubber for which the organic Iodine retention rate is 90%, allowing to omit an additional filter stage • Lower weight and dimension • Lower cost of installation Slide 9 Rev. : 15. 8. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project Summary (1) • The output was the basic design of an upgraded Russian system for trapping fission products (FPR) related to containments of VVER-1000 (Type V-320) based on Sliding Pressure Venturi Scrubber with metal fiber filter stage • The major dimensional characteristics and the weight of a new FPR have been determined • A future implementation of the FPR will bring the VVER-1000 (V-320) in line with the current safety requirements • Detailed design, construction and commissioning can now be performed Slide 10 Rev. : 15. 8. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project Summary (2) The main technical requirements for the FPR System were determined with: F Aerosols retention rate 99. 9 % F Molecular iodine retention rate 99 % F Organic iodine retention rate 90 % F Aerosols load capacity 200 кг F Residual power density of fission products accumulated F in filter 300 k. W F Average mass diameter of aerosol particles 0. 5 micro-meter F Flow rate through system 7. 5 -10 kg/s F Period of passive operation 24 hours F Pressure at which the system opens 5 bar (functioning up to 6 bar) F Temperature of steam-gas mixture 180 C (Overheating condition) Slide 11 Rev. : 15. 8. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) Improvement of the fission product retention system at VVER NPPs under Accidents TACIS R 2. 08/95 Project Summary (3) • The required design documentation for implementation can be drawn up based on the results of the present project • Russian specialist have gotten inside into the FPR-systems developed by the EU-Contractor (Siemens) by: • • a walk down of a German FPR-installation • and of experimental facilities, where FPR systems are verified for their performance data The work carried out was characterized by a efficient team spirit and good mutual understanding Slide 12 Rev. : 15. 8. 2005