Fork-end heat pipe for passive air cooling of spent nuclear fuel pool

2021 ◽  
Vol 374 ◽  
pp. 111081
Author(s):  
Jonghwi Choi ◽  
Changhwan Lim ◽  
Hyungdae Kim
Keyword(s):  
Heat Pipe ◽  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Air Cooling ◽  
Spent Nuclear Fuel Pool

scholarly journals A Study of Prediction Model Improvement for Air-Oxidation Breakaway in a Postulated Spent Nuclear Fuel Pool Complete Loss of Coolant Accident

2021 ◽  
Vol 13 (3) ◽  
pp. 1442
Author(s):  
Sanggil Park ◽  
Jaeyoung Lee ◽  
Min Bum Park
Keyword(s):  
Kinetic Model ◽  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Complete Loss ◽  
Air Oxidation ◽  
Loss Of Coolant Accident ◽  
Spent Nuclear Fuel Pool ◽  
Loss Of Coolant ◽  
Model Derivation ◽  
Model Improvement

The temperature of zirconium alloy cladding on the postulated spent nuclear fuel pool complete loss of coolant accident is abruptly increased at a certain time and the cladding is almost fully oxidized to weak ZrO2 in the air. This abrupt temperature escalation phenomenon induced by the air-oxidation breakaway is called a zirconium fire. Although an air-oxidation breakaway kinetic model correlated between time and temperature has been implemented in the MELCOR code, it is likely to bring about unexpected large errors because of many limitations of model derivation. This study suggests an improved time–temperature correlated kinetic model using the Johnson–Mehl equation. It is based on that the air-oxidation breakaway is initiated by the phase transformation from the tetragonal to monoclinic ZrO2 at the oxide–metal interface in the cladding. This new model equation is also evaluated with the Zry-4 air-oxidation literature data. This equation resulted in the almost similar air-oxidation breakaway timing to the actual experimental data at 800 °C. However, at 1000 °C, it showed an error of about 8 min. This could be inferred from the influence of the ZrN phase change due to the nitrogen existing in air.

scholarly journals Applicability of one-body model to predict thermal distribution in spent nuclear fuel pool

2019 ◽  
Vol 555 ◽  
pp. 012004
Author(s):  
Husaini Roslan ◽  
Nahrul Khair Alang Md Rashid ◽  
Muhammad Arif Sazali
Keyword(s):  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Body Model ◽  
Thermal Distribution ◽  
Spent Nuclear Fuel Pool

Specific features of liquid level alteration in spent nuclear fuel pool

2014 ◽  
Vol 0 (3) ◽  
Author(s):  
Borys M. Hordieiev ◽  
Oleksii V. Zivenko ◽  
Vasyl O. Zivenko ◽  
Yevhen A. Hudyma ◽  
Dmytro Yu. Motorkin
Keyword(s):  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Liquid Level ◽  
Spent Nuclear Fuel Pool

scholarly journals The Limitations of an Air-Oxidation Breakaway Model to Predict a Zirconium Fire in a Spent Nuclear Fuel Pool Accident

2019 ◽  
Vol 11 (22) ◽  
pp. 6364
Author(s):  
Sanggil Park ◽  
Min Bum Park
Keyword(s):  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Critical Phenomenon ◽  
Fission Products ◽  
Model Parameters ◽  
Spent Fuel ◽  
Air Oxidation ◽  
Loss Of Coolant Accident ◽  
Spent Nuclear Fuel Pool ◽  
Spent Fuel Pool

The OECD/NEA Spent Fuel Pool (SFP) project was conducted to investigate consequences of spent nuclear fuel pool accident scenarios. From the project, it was observed that cladding temperature could abruptly increase at a certain point and the cladding was completely oxidized. This phenomenon was called a “zirconium fire”. This zirconium fire is one of the crucial concerns for spent fuel pool safety under a postulated loss of coolant accident scenario, since it would lead to an uncontrolled mass release of fission products into the environment. To capture this critical phenomenon, an air-oxidation breakaway model has been implemented in the MELCOR code. This study examines this air-oxidation breakaway model by comparing the SFP project test data with a series of MELCOR code sensitivity calculation results. The air-oxidation model parameters are slightly altered to investigate their sensitivities on the occurrence of the zirconium fire. Through such sensitivity analysis, limitations of the air-oxidation breakaway model are identified, and needs for model improvement is recommended.

Sign in / Sign up

Export Citation Format

Share Document