1. REACTOR PRESSURE VESSEL

2. REACTOR PRESSURE VESSEL
RPV IS A UNIQUE COMPONENT, AS :
NUCLEAR REACTION IS REALIZED INSIDE RPV
RPV CONTAINS WHOLE NUCLEAR FISSION MATERIALS
RPV CONTAINS PRACTICALLY ALL RADIOACTIVELY INDUCED MATERIALS
RPV CANNOT BE PRACTICALLY COOLED DOWN IF IT RUPTURED, THEN NON-CONTROLLED CORE MELTING TAKES PLACE

3. REACTOR PRESSURE VESSEL
DUE TO A LARGE VOLUME OF REACTOR ACTIVE CORE TO PRODUCE REQUIRED HEAT OUTPUT,
AND DUE TO HIGH OPERATION CONDITIONS:
RPV IS A LARGE AND HEAVY COMPONENT
RPV IS PRACTICALLY NON-REPLACEABLE
MUST BE SAFE DURING WHOLE LIFETIME
RPV MUST FULFIL THE MOST SEVERE REQUIREMENTS TO MATERIAL QUALITY

4. RPV PARAMETERS

5. RPV CODES
ASME Boiling and Pressure Vessel, Section III – Nuclear Power Plant Components
KTA – Safety Standards for Components of the Reactor Coolant Pressure Boundary of Light Water Reactors
Japanese Society of Mechanical Engineers, JSME Codes for Nuclear Power Generation Facilities, Rules on Design and Construction for Nuclear Power Plant

6. ISI CODES
ASME Section XI - "Rules for In-service Inspection of Nuclear Power Plant Components”
RSE-M - “Rules for In-Service Inspection for Mechanical Components of PWR Nuclear Island”

7. WWER RPV CODES
Rules for Design and Safe Operation of Components of NPPs, Test and Research Reactors and Stations, 1973, 1989, 2000
Code for Strength Calculations of Components of Reactors, Steam-Generators and Pipings of NPPs, Test and Research Reactors and Stations, 1973, 1989
VERLIFE – Unified Procedure for Lifetime Assessment of Components and Piping in WWER type NPPs during Operation, 2003, 2008,
IAEA-NULIFE-VERLIFE

8. DIFFERENCE BETWEEN PWR AND WWER RPV
KWU

9. OUTLET NOZZLES
INLET NOZZLES

10. DIVIDING RING

11. TYPICAL TECHNOLOGY PROCESS FOR WWER-1000 RPV
Upper part of RPV
welding of circumferential welds
anticorrosive cladding
mechanical and heat treatment
quality inspection
Lower part of RPV
RPV assembly
1. welding of circumferential weld no.4
anticorrosive cladding of a zone under weld no.4
TYPICAL TECHNOLOGY PROCESS FOR WWER-1000 RPV
BottomДнище
Lower core shell
Upper core shell
Support shell
Lower nozzle shell
Upper nozzle shell
Flange shell

12. PWR
weld
weld
NOZZLE FORGING
WWER-1000
WWER-440

13. RPV STRESSORS

14. CREEP & RELAXATION

15. FATIGUE

16. THERMAL AGEING

17. IRRADIATION DAMAGE

18. CORROSION

19. WEAR & EROSION

20. STRESS CORROSION CRACKING

21. WWER
PWR

22. TYPICAL CIRCUMFERENTIAL FLUX DISTRIBUTION IN PWR

23. WWER FLUX DISTRIBUTION IN LOW-LEAKAGE CORES23

24. NEUTRON FLUENCES

25. TYPICAL AXIAL FLUX DISTRIBUTION IN WWER

26. TRANSITION TEMPERATURES
PWR:
NIL DUCTILITY TEMPERATURE
RTNDT
WWER:
CRITICAL TEMPERATURE OF BRITTLENESS Tk

27. RPV MATERIALS PWR: ASME: KTA: RCC-M: (ASME) SA 302 Grade B
ASME SA 533 Grade B Class 1
ASME SA 508 Class 2
KTA:
22NiMoCr37, 20MnMoNi55
RCC-M:
16MnD5

28. RPV MATERIALS WWER: WWER-440 15Kh2MFA(A) , 18Kh2MFA – Cr-Mo-V type
15Kh2NMFA(A) – Ni-Cr-Mo-V type

29. RPV MATERIALS

30. RPV MATERIALS trend in decrease of Cu+P contents

31. QUALIFICATION TEST PROGRAMME
TENSILE TESTS
NOTCH IMPACT TESTS
FRACTURE TOUGHNESS TESTS
FATIGUE TESTS
CORROSION TESTS
IRRADIATION DAMAGE STUDY
THERMAL AGEING STUDY

32. ACCEPTANCE TEST PROGRAMME
TENSILE TEST
ROOM & DESIGN TEMPERATURE
NOTCH IMPACT TESTS
ROOM TEMPERATURE
DETERMINATION OF Tk OR
CONFIRMATION OF Tk
DROP WEIGHT TESTS
RESISTANCE TO INTERCRYSTALLINE CORROSION

33. MONITORING DAMAGE IN RPV
PRESSURE AND TEMPERATURE RECORDING
SURVEILLANCE SPECIMEN PROGRAMME
NEUTRON DOSIMETRY IN OUTER WALL
IN-SERVICE INSPECTION
VIBRATION MONITORING