Fuel reliability and supply assurance in Ukraine

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Theodore Phelps
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1 Fuel reliability and supply assurance in Ukraine Oleg Godun Head of Innovation Fuel Cycle Department NATIONAL NUCLEAR ENERGY GENERATING COMPANY ENERGOATOM SCIENTIFIC AND TECHNICAL CENTER Ukraine, Kiev TWGFPT, , IAEA, Vienna 1

2 Contents 1. Introduction 2. VVER-1000 exploitation experience Characteristic - Limits - Experience. Statistics leakage 3. TVS-Westinghouse 4. Innovation activity 5. Conclusion 2

Introduction RIVNE NPP Installed capacity - 2 835 МW 2 Units WWER-440 2 Units WWER-1000 Electricity share more then 50% in 2014 ZAPORIZHZHYA NPP Installed capacity - 6 000 MW 6 Units WWER-1000

3 Introduction RIVNE NPP Installed capacity МW 2 Units WWER Units WWER-1000 Electricity share more then 50% in 2014 ZAPORIZHZHYA NPP Installed capacity MW 6 Units WWER-1000 KHMELNITSKY NPP Installed capacity MW 2 Units WWER SOURTH-UKRAINE NPP Installed capacity MW 3 Units WWER

4 VVER-1000 fuel exploitation experience Control of FAs leakage provided - on power reactor by testing of I on the coolant (on-line control); - on reactor 0% P by sipping-method and system for identification of leakage rods (I-131, Cs-134, Cs-137). FAs can be used if has leakage and A (I-131) < 10-6 Ci/kg Exploitation coolant activity limit 1*10-3 Ci/kg Project coolant activity limit - 5*10-3 Ci/kg Identification of FAs leakage provided by spike-effect: increase A (I-131) of coolant on 5 time in according to power level decrease on 20%. 4

5 VVER-1000 fuel exploitation experience During the total of unloaded FAs from VVER-1000 is Total number of FAs with leakage is 54 The number of the leakage FAs unloaded ahead of schedule makes 30 FAs. N u m b e r o f F A s Year

6 VVER-1000 fuel exploitation experience Statistics during of distribution of leakage FAs depending on number of the year shows stable existence of leakage FAs after the first year of operation. Thus the insignificant tendency to decrease in number of leakage FAs of third or fourth years of operation is observed. So, during total number of leakage FAs of the third year - 4, the fourth year 8. For comparison, the same indicator during makes 12 and 11 FAs respectively. 6

7 VVER-1000 fuel exploitation experience Блок 1 ЗАЭС Блок 2 ЗАЭС Блок 3 ЗАЭС Блок 4 ЗАЭС Блок 5 ЗАЭС Блок6 ЗАЭС Блок 3 РАЭС 120 Блок 4 РАЭС Блок 1 ХАЭС Блок 2 ХАЭС Блок1 ЮУАЭС Блок 2 ЮУАЭС Блок 3 ЮУАЭС Distribution of the fuel unloaded during by burnup shows that the majority of the unloaded FAs have burnup in the range of MW*d/kg. 7

8 VVER-1000 fuel exploitation experience znpp rnpp khnpp sunpp total 5 0 Znpp Year Rnpp Khnpp SUnpp Total FPLR E E FPLR FPLR E E E

9 VVER-1000 fuel exploitation experience Main ways for VVER fuel reliability: 1. Strengthening of control of fuel fabrication (incoming inspection) 2. Realization of non-appearance of debris on first loop and active core 3. Realization of actions for improve of fuel handling 4. Realization of compensation arrangements (in a case of leakage) 9

TVS-Westinghouse Phases of implementation: - 2000 2005 designing and licensing - 2006 2010 6 LTA on 4 years exploitation of first experience party FAs at South- Ukraine NPP (Unit 3 VVER-1000 (B-320)).

10 TVS-Westinghouse Phases of implementation: designing and licensing LTA on 4 years exploitation of first experience party FAs at South- Ukraine NPP (Unit 3 VVER-1000 (B-320)) TVS-Westinghouse (TVS-W) TVS-W design was improved (distance grids profile is changed ). Main goals of modernization strengthening of skeleton. Approved of new design TVS-WR 2015 exploitation of 42 TVS-WR Calculations and tests: - Hydraulic tests of the TVS-WR and its elements - Static and dynamic tests of distance grid on damage - Testing on vibration - Imitation of FAs management (handling) on reactor 10

11 Innovation activity Load follow operation FAs - TVS-A Operation algorithm: hours on 100% Pnom; - 1 hour decrease P to 80% Pnom; hours on 80% Pnom; - 1 hour increase P to 100% Pnom 4 years operation test 21 cycle on 1 year Start April 2015 Realization Unit 2 Khemlitsky NPP 11

12 Innovation activity FAs zero leakage Start on 2012 Since 2014 have a 5 participants (JSC TVEL (RF), Rosatom (RF), Energoatom (UA), Temelin NPP (CZ), Kozloduy NPP (BL)) Main goals: - is development, introduction and control of performance in the design organizations, at manufacturers of the Supplier and in the Operating organizations of the organizational and technical actions directed on achievement of zero level of refusal of nuclear fuel of the Supplier on the NPP of the Operating organizations. Realization 5 years 12

13 Conclusions Decrease of leakage FAs in period FPLR=20 ppm in 2010, 10 ppm in Average burnup is 50 MWd/kg U. Works for the Improvement of FAs handling is under implementation. Works for the diversification of fuel supply (JSC TVEL and Westinghouse) is under realization. Realized of licensing of new fuel design implementation. Follow load operation of WWER-1000 (B-320) is under researching 13

14 Thank you for attention! 14

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