GNS Activities - Solutions for Russian Spent Fuel -

Transcription

1 GNS Activities - Solutions for Russian Spent Fuel - Bulgarian nuclear energynational, regional and world energy safety June 09-11, 2010 Varna, Bulgaria Dr. Felix Thomas GNS Gesellschaft für Nuklear-Service mbh, Essen, Germany Page 1

2 Presentation Overview About GNS GNS Cask Technologies CASTOR Casks CONSTOR Casks Cask Solutions for Russian Fuel Summary and Conclusion Page 2

3 GNS Gesellschaft für Nuklear-Service mbh A medium-sized company founded in 1974, based in Essen/Germany Main Task: Competence Centre for the German utilities for the management of spent fuel and nuclear waste from German power plants Worldwide operations as one of the leading manufacturers of casks for spent fuel (CASTOR, CONSTOR ) Page 3

4 Structure of the GNS Group 48% 28 % 5,5 % 18,5 %* * Südwestdeutsche Nuklear- Entsorgungs-Gesellschaft mbh, Stuttgart (EnBW Kraftwerke AG, E.ON Kernkraft GmbH) GNS Gesellschaft für Nuklear-Service mbh 100 % 55 % 100 % 75 % Brennelementlager Gorleben GmbH Brennelement- Zwischenlager Ahaus GmbH WTI Wissenschaftlich-Technische Ingenieurberatung GmbH Deutsche Gesellschaft zum Bau und Betrieb von Endlagern für Abfallstoffe mbh (DBE) Page 4

5 General Information Service: 35 GNS-Group Employees: 475 Turnover 2008: 242 Mio. Blue-collar workers: 60 Administration: 65 GNS Σ 400 Engineers: 240 plus Subsidiaries WTI Employees: 75 DBE/DBE TEC Employees: 600 Page 5

6 Business Areas in the GNS Group Waste Management Engineering and Decommissioning Services Engineering Services and Consulting for Nuclear Facilities (WTI) Nuclear Casks Spent Fuel Management Planning, Erection and Operation of Facilities for Storage of Radioactive Wastes (DBE) Page 6

7 GNS Cask Technologies Advanced Cask Technologies of the Types CASTOR and CONSTOR for Spent Fuel and High-Level Radioactive Wastes first cask with spent fuel was placed into storage in 1983 over 1100 casks are now in interim storage worldwide approx casks have been delivered more than 1700 casks are contracted until now Page 7

8 GNS Cask Series Types CASTOR -Casks Monolithic cask body made of ductile cast iron Bolted double lid system Pressure monitoring Interior neutron moderator Machined cooling fins CONSTOR -Casks Sandwich cask body Welded steel plates with head ring made of forged steel Filling with CONSTORIT Welded and bolted lid system Welded-on cooling fins Page 8

9 The CASTOR Cask The CASTOR is a: CASK for Storage and Transport Of Radioactive Material Long-term interim storage Transport Page 9

10 The CASTOR Cask The CASTOR is the worldwide common trademark for GNS and stands for a High-Tech-Product. Its protection goals are: Safe enclosure of the radioactive contents Shielding of radiation Dissipation of the decay heat from the radioactive materials Guarantee of subcriticality Page 10

11 Design Features of CASTOR Casks Dual purpose operation for transport and storage Monolithic cask body made of ductile cast iron, casted in one piece Casks licensed for wide range of fuel types, i. e. PWR, BWR, HTR, MTR Dimensions Length : Diameter : 4.0 to 6.0 m 1.5 to 2.5 m Wall thickness 0.25 to 0.45 m Cylindrical holes filled with polyethylene moderator in cask side wall Double lid with monitored leak-tightness control (pressure gauge) Cover plate Pressure monitoring Secondary lid Primary lid Fuel basket Trunnion Cask body Radial fins Moderator rods Page 11

12 Monitored Double Lid System Pressure Gauge Page 12

13 Ductile Cast Iron Body Page 13

14 Machining of Cask Surfaces Page 14

15 Ultrasonic Testing Page 15

16 Insertion of Basket Page 16

17 Assembly of Casks Assembly and Preparation for Delivery in the GNS-Cask- Manufacturing Plant in Mülheim, Germany Page 17

18 Main CASTOR Cask Types CASTOR V/19 Dimensions: H = 5860 mm, Ø = 2440 mm Cask Weight Loaded: t max. Capacity: 19 PWR FAs Max. Initial Enrichment: 4.45 wt % U-235 Max. Average Burn-up: 65 GWd/MTHM Max. Heat Load: 39 kw Total Activity: 5.5E+17 Bq CASTOR V/52 Dimensions: H = 5450 mm, Ø = 2440 mm Cask Weight Loaded: t max. Capacity: 52 BWR FAs Max. Initial Enrichment: 4.6 wt % U-235 Max. Average Burn-up: 65 GWd/MTHM Max. Heat Load: 40 kw Total Activity: 1.2E+18 Bq Page 18

19 The CONSTOR Cask Design Features are: Dual purpose operation for transport and storage Thick-walled cylindrical sandwich cask body Inner and outer liner made of steel Cavity between inner and outer liner filled with CONSTORIT Lid system consists of 3 lids: Bolted primary lid Welded seal plate Welded secondary lid Page 19

20 GNS Cask Solutions for Russian Fuel RBMK-1500 Fuel Assemblies - CASTOR RBMK CONSTOR RBMK CONSTOR RBMK1500/M2 VVER-440 Fuel Assemblies - CASTOR 440/84 - CASTOR 440/84M - CONSTOR 440/84 VVER-1000 Fuel Assemblies - CASTOR 1000/19 - CONSTOR 1000/19 Page 20

21 Current International Projects Ignalina (Lt) 20 CASTOR RBMK CONSTOR RBMK CONSTOR RBMK1500/M2 Kozloduy (Bg) 34 (+35) CONSTOR 440/84 Dukovany (Cz) 60 CASTOR 440/84 33 CASTOR 440/84M Temelin (Cz) 35 CASTOR 1000/19 Ignalina Temelin Kozloduy Dukovany Page 21

22 Examples of GNS Solutions for VVER Fuel CONSTOR 440/84 for Kozloduy NPP, Bg CASTOR 440/84 for Dukovany NPP, Cz and Greifswald NPP, G CASTOR 440/84M for Dukovany NPP, Cz CASTOR 1000/19 for Temelin NPP, Cz Page 22

23 Design Features of the CONSTOR 440/84 Cask Designed as transportable storage cask for 84 spent fuel assemblies of the type VVER-440 for Kozloduy NPP, Bg Dimensions: Overall height: 4138 mm Outer diameter: 2700 mm Cavity height: 3242 mm Cavity diameter: 1740 mm Cask weight loaded: ~ 112 Mg Max. initial enrichment: 3.87 wt % U-235 Max. burnup: 50 GWd/t HM Max. heat load: kw Page 23

24 CONSTOR 440/84 for VVER-440 Spent Fuel Fuel Basket Inner Liner with Head Ring Head Ring Page 24

25 CASTOR 440/84M for VVER-440 spent fuel A CASTOR 440/84M cask in the storage facility at the Dukovany Nuclear Power Plant in the Czech Republic Page 25

26 Design Features of the CASTOR 440/84M The cask is designed for transport and long-term interim storage of: up to 84 VVER-440 fuel assemblies max wt % U-235 initial enrichment max. 50 GWd/MTU burn-up max kw heat load per cask Total mass in storage configuration: approx. 120 Mg Page 26

27 CASTOR 1000/19 for VVER-1000 Fuel Design features of the CASTOR 1000/19 for Temelin NPP, Cz Designed for transport and long-term storage of: 19 VVER-1000 fuel assemblies max. 5 w/o U-235 initial rod enrichment 60 GWd/MTU burn-up 17.5 kw decay heat load per cask Total mass (storage configuration): approx. 115 Mg Transport configuration with impact limiters Page 27

28 Design Features of the CASTOR 1000/19 CASTOR 1000/19: Cask body and lid system Wall of the cask body including moderator rods To improve the neutron shielding: 2 moderator plates (top and bottom) Radial cooling fins to improve the heat transfer from the cask to the environment Primary lid with its bolted connection (stud bolts with cap nuts) and its sealing system Secondary lid with its bolted connection (cap screws) and its sealing system Requirement: four top handling trunnions in order to assure redundancy during cask handling operations Two additional trunnions on the bottom end of the cask for tilting the cask from vertical to horizontal position or reverse for transport Page 28

29 Design Features of the CASTOR 1000/19 CASTOR 1000/19: Design of the basket Accommodation of the fuel assemblies inside the cask cavity: 19 hexagonal fuel assembly receptacles made of borated stainless steel Cylindrical stainless steel plates and cylindrical anodised aluminium plates Plates are axially arranged in alternating order and fixed by threaded rods with stainless steel spacer tubes Optimised design to fulfil all requirements of maximum shielding, mechanical robustness, efficient dewatering as well as drying Page 29

30 Summary GNS has delivered a wide variety of casks in the CASTOR and CONSTOR series for spent fuel and high-level waste. More than 1000 casks are loaded and in interim storage worldwide: Germany: 868 Lithuania (Ignalina NPP): 118 Czech Republic (Dukovany NPP) 72 USA: 35 Belgium: 7 Switzerland: 6 South Africa: 4 as of Dec 2009 Page 30

31 Conclusion CASTOR and CONSTOR casks have been successfully developed, manufactured and delivered for transport and interim storage of spent fuel and high active waste. These casks fulfil both the requirements for: - type B(U) packages according to IAEA regulations and - the requirements covering different accident situations to be assumed at storage sites. Page 31