TACIS Project R 8 0198 TRANSLATION EDITING AND

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TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 General Information of the Project F Beneficiary: Rosenergoatom, Moscow F Contractor: Framatom ANP F Local Subcontractor : RISI, Lytkarino F Budget: 448 428 € F Duration: 14 months F Contract expired: November 2001 Slide 1 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Objective of the project F Cable ageing monitoring in a selected Russian VVER 440 NPP (NV, Unit 3) F Evaluate the present status and condition of the cables w monitor the environmental conditions inside the hermetic zone and to identify and check classification of the cables in the confinement w In-Service inspection of the representative cables w identification of the degradation mechanisms and prediction the remaining lifetime of the cables on the basis of laboratory testing w evaluate the ageing considering normal operation, accident and post accident conditions w evaluate residual lifetime of the cables in normal operation, design basis accidents and post accident conditions Slide 2 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results F Task 3; Identification and classification of cables in the confinement w Novovoronesh Unit 3 was selected as pilot plant w A walk-down in the hermetic zone was carried out w Both control and power cables involved w It was defined: w • The main insulation material for cables was PVC • In some cases impregnated paper was used as insulation (not evaluated in this project) Cables in hermetic zone were classified according to Russian Guides (ОПБ 88/97) Slide 3 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 4; Review and definition of environmental conditions w First the environmental conditions were elaborated from the design information w The cable service condition was also monitored during operation by termovision, temperature and radiation monitors during a 6 months period w The temperature in general 25 -50 o. C, in some hot spots 50 -70 o. C Slide 4 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 4; Review and definition of environmental conditions w The dose during one year was estimated at 300 -1000 Gy • For monitoring of external service conditions of cables at the NV NPP, an assembly of three detectors was used: Li. F -ДТГ-4; ПСТ; ДТС-0. 1/1. 0 -СГД-8 • A measurement range of such assembly is 10 -4 - 2. 104 Gy. Slide 5 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 4; Review and definition of environmental conditions w The rooms were grouped 5 categories based on the monitoring results Slide 6 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 4; Review and definition of environmental conditions w Conditions in DBA conditions were estimated based on design information w The leakage of radioactive steam from main pipeline and it’s propagation in the containment have been simulated. Slide 7 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 4; Review and definition of environmental conditions w Specification for testing conditions for selected cable material was based on above results Сalculated -dose rate and -doses in the middle of a containment with a postulated release of fission products, accumulated in the first loop Slide 8 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 5; Actual status of classified cables w Visual inspection, staff questioning and cable indenter testing at site w During walk down cutting of cable samples for laboratory testing Slide 9 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 5; Actual status of classified cables w Compression module, plasticizer concentration and Elongation to Break were measured in laboratory conditions w Above 40 o. C the ageing process sharply increases Slide 10 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 5; Actual status of classified cables w Cable samples subjected to simulated DBA and post DBA environment conditions in laboratory w Insulation resistance reduced significantly, but remained above limiting values Slide 11 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 6; Examination of representative cable samples w Accelerated thermal ageing on selected cable samples from Task 5 for elaboration of the “Activation Energy”. w Definition of the testing conditions Slide 12 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 6; Examination of representative cable samples w Concentration of plastisizer was measured as the main ageing parameter w Based on mechanical testing 15% EAB (elongation at break) was chosen as critical limit Slide 13 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 6; Examination of representative cable samples w Qualifying tests was carried out for 10 and 15 years lifetime. w Time dependants of ageing under different temperatures based on experimental data was defined w Service life for exposure at 46 o. C was evaluated to 15 years and at 50 o. C for 10 years for investigated PVC cables including DBA “treatment” Slide 14 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 7; Degradation mechanisms w The main degradation mechanisms described • • Destruction of the molecular chains Desorbtion of plastisizer §Sew of the molecular chains §Destruction §Desorbtion of plastisizer Slide 15 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 7; Degradation mechanisms w Evaluation of the cables condition and residual lifetime was recommended by : • EAB – destructive method • Cable indenter method – non destructive method which recommended for situation with thermo-ageing prevailing (as example Unit 3 Novovoronezh NPP) • Method of remaining concentration of plasticizer - practically non destructive method, if it was based on micro samples, recommended for situation with thermo-ageing prevailing Slide 17 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 7; Degradation mechanisms w It was determined that thermo gravimetry of micro samples PCV insulation allow to estimate remaining concentration of plasticizer, and a rate of molecular destruction Slide 18 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 7; Degradation mechanisms w Use of plant specific surveillance samples for accelerated ageing in hot spots was recommended for new NPP Unites with new type cables with new type of insulation. Slide 19 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Project implementation and results (cont. ) F Task 8; Calculation of RSL (residual life-time) w The RSL was evaluated based on different monitoring methods of cables insulation w RSL was evaluated for cables exposed at DBA conditions and also not exposed at DBA conditions w Results of the evaluation shown below at figure and table Slide 20 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Cables ageing management recommendations F Cables insulation materials multifactor degradation mechanisms investigation F Qualification cable testing should be conducted with simulating ageing in operation conditions for reducing level of conservatism RSL evaluation F Monitoring of environmental conditions in the cable locations, especially for finding hot spots F Representative cables sampling for cables ageing monitoring F Cables ageing monitoring by non destructive methods at the hot spots Slide 23 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Qualification testing of “aged“ cables F Stages of cable testing w Identification and inspection by non destructive methods w Sampling of representative cables and testing for failure tolerance at DBA w Artificial ageing to condition of new Service Life time and testing for failure tolerance at DBA Slide 24 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Unit Cable Monitoring Algorithm Slide 25 Rev. : 24. 11. 2005

TACIS Project: R 8. 01/98 – TRANSLATION, EDITING AND DIFFUSION OF DOCUMENTS (Result Dissemination) CABLES AGEING MONITORING TACIS Project R 2. 10/96 Спасибо за внимание Slide 26 Rev. : 24. 11. 2005