Reactor internals design

Components : Core Support Barrel Core Shroud Lower Support Structure Alignment Keys Major Functions 1. Provide a support structure for the core. 2. Provide a suitable coolant pass. 3. Provide a shield for reactor vessel against irradiation damage. 4. Align the core and guide incore instrumentation

Reactor Internals Design Faculty of Mechanical Engineering Ljubljana University (May 30, 2019) Korea Atomic Energy Research Institute Kyeong-Hoon Jeong Hydro Electric Power Plant in My Home Town Chilbo Hydroelectric Power Plant Constructed in1945, Net Capacity : 30MWe 3% of Korean Standard Nuclear Power Plant Single Unit 2% of Korea APR1400 Single Unit Korean Commercial Nuclear Power Plants in Operation Reactor Kori 1, Type Net capacity Supplier PWR 563 MWe 612 MWe Westinghouse (USA) Operation 4/78 ~ 6/17 7/83 Kori Unit is a sister plant of Krško nuclear power plant in Slovenia This plant is more advanced plant than Kori Unit nevertheless its operation on Jan 1983 Wolsung 4/83, Shutdown for Estimation of Life Extension PHWR (CANDU) 629 MWe AECL (Canada) Kori 3, PWR 903 MWe Westinghouse (USA) 9/85, 4/86 Hanbit 1, PWR 900 MWe Westinghouse (USA) 8/86, 6/87 Hanul 1, PWR 920 MWe Framtome (France) 9/88, 9/89 Hanbit 3, PWR (OPR) 950 MWe Wolsung 2, 3, PHWR (CANDU) 650 MWe Hanul 3, 4, 5, PWR (OPR) 960 MWe Hanjung, 6/98, 6/99, KOPEC, KAERI (Korea) 1/04, 12/04 Hanbit 5, PWR (OPR) 950 MWe Doosan, KOPEC (Korea) 5/02, 12/02 Shin Kori 1,2 PWR (OPR) 950 MWe Doosan, KOPEC (Korea) 2/11, 3/12 Hanjung, KAERI (Korea) 12/95, 3/96 CE (USA) Hanjung (Korea) AECL (Canada) 6/97, 6/98 , 6/99 Korean Nuclear Power Plants under Construction or on Order Reactor Type Net capacity Start-up Shin Wolsung 1, PWR (OPR) 950 MWe 3/12, 1/13 Shin Kori 3, PWR (APR) 1350 MWe 3/16, 9/18 Shin Hanul 1, PWR (APR) 1350 MWe Under Test Shin Kori 5, PWR (APR) 1350 MWe Under Construction Shin Hanul 3, PWR (APR) 1350 MWe Suspended Total (24 plants in operation) 22,500 MWe 17.5% in Total Electric Power Production (2018) Nuclear Power Plant Reactor Types PWR : Pressurized Water Reactor BWR : Boiled Water Reactor PHWR (CANDU) : Pressurized Heavy Water Reactor Graphite Moderated Reactor (PBMR) CANDU Reactor  Natural uranium (0.7% U-235 + 99.3% U-238)  Zirconium alloy cladding  Heavy water (D20) moderator Nuclear Steam Supply System  WH-type  Krško NPP Nuclear Steam Supply System Nuclear Steam Supply System  Manufacturing Cost  Transportation  Structural Integrity of Reactor Vessel Nuclear Steam Supply System  Nozzle /Fuel Location  ICI Locations  Hot Leg & Cold Leg Change?? 10