CE-PECS (Cooling Experiments for Passive Ex-vessel corium retainning and Cooling System)

2019-05-09 15:42
Legal Name of Facility Cooling Experiments for Passive Ex-vessel corium retainning and Cooling System
Abbreviated Name CE-PECS
Facility Type Non-reactor Based Instrument; Thermal Hydraulic Facility
Reactor Design Reference EU-APR1400, PWR
Application Nuclear Safety; Severe Accident
Current Purpose Test facility to measure flow rate and pressure distribution at reactor core and pressure drop along main flow path
Short Description The newly engineered corium cooling system, that is, an ex-vessel core catcher (PECS, Passive Ex-vessel corium retaining and Cooling System), has been developed as one of severe accident mitigation measures for an EU-APR1400 in Korea. The PECS is a passive corium cooling system consisting of an inclined engineered cooling channel made of a single channel between the body of the core catcher and the inside wall of the reactor cavity. If the severe accident in a nuclear power plant occurs and the reactor vessel fails, the molten corium ejected from the reactor vessel is relocated in the body of the PECS. A buoyancy-driven natural circulation flow through the cooling channel and down-comers was intended to provide effective long-term cooling, and to stabilize thermally the molten corium mixture in the core catcher body. CE-PECS experimental facility was constructed and performed tests and analyses to verify the coolability of the cooling channel in the PECS. The experimental cooling channel is made of a single channel simulating the actual cooling channel between the core catcher body and inside wall of the reactor cavity. The width of the cooling channel and the heating block is 0.3 m, and the horizontal length is 3 m. The gap size of the cooling channel is 0.1m as is the gap between the core catcher body and concrete body. Seven short columnar structures, called studs, each with dimension of 0.07m´0.1m´0.1m (width´ length´height), are placed in the cooling channel gap to support the static and dynamic loading on the core catcher body. The gap of the cooling channel is determined appropriately such that the cooling channel also has an inclination angle of 10 degrees as is the actual core catcher system to facilitate the steam venting. A down-comer, which has a 0.1 m diameter, is provided to generate the natural circulation flow. A water tank is also installed to supply static pressure to the cooling channel.
Status Operational
Operating Organization Korea Atomic Energy Research Institute – Thermal Hydraulics and Severe Accident Research Division (KAERI - THSARD)
Operating Organization URL http://www.kaeri.re.kr http://www.thsard.re.kr
Homepage http://www.thsard.re.kr/db-list2/?uid=77&mod=document&pageid=1
Country Republic of Korea
Keywords APR1400; PECS; Severe accident
Local language Legal Name of Facility 코어캐쳐 냉각성능 검증 실험장치
Natural circulation tests Case 3-1~ 10 Flow resistance K=1.1, Channel gap 0.1m
Case 4-1~ 9 Flow resistance K=12, Channel gap 0.1m
Case 6-2~ 4 Flow resistance K=12, Channel gap 0.15m
Forced circulation tests T14-1~3 Flow resistance K=12, Channel gap 0.1m
Related Documents or Photo Files
File Name (Click to download) Description
ICAPP14239-Ha.pdf Related paper: Kwang Soon Ha et al., Coolability of an Ex-vessel Core Catcher Induced by Natural Circulation Flow, Proceedings of ICAPP 2014, Charlotte, USA, April 6-9, 2014, Paper 14239
CE-PECS-Photo.jpg Facility photo