Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (4): 40605-040605.doi: 10.11889/j.0253-3219.2016.hjs.39.040605

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Study of airborne radioactivity concentration in fuel handling area

ZHU Jianping, XIAO Feng, GAO Xilong, LYU Huanwen, LI Lan   

  1. Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213, China
  • Received:2015-11-23 Revised:2016-01-22 Online:2016-04-10 Published:2016-04-08
  • Supported by:

    Supported by the Key Science and Technology Subject of China National Nuclear Corporation

Abstract:

Background: Currently, the computational model used to airborne radioactive source terms is too simple to applying to all cases. Purpose: The aim is to build a computational model for airborne radioactive concentration in fuel handling area and to study the influence factor of airborne radioactive source term thus to decrease occupational exposure dose. Methods: This paper constructed a computational model of airborne radioactive concentration in fuel handling area. Variations of typical radionuclide were analyzed. Then, we studied the effluences of radionuclide types, ventilation flow on airborne radioactive concentration and the main sources of radioactivity. Results: The maximum values of airborne radioactive concentration for all radionuclides during refueling should be treated as design values instead of the values at a certain moment or at the end of refueling. There is an inverse relation between the ratio of ventilation flow to net volume of fuel handling area λh and airborne radioactivity concentration, the radioactivity in reactor coolant is the main source of airborne radioactivity. Conclusion: Adjusting ventilation flow, reducing radioactivity in coolant and decreasing evaporation are the main ways to reduce airborne radioactivity.

Key words: Airborne radioactivity, Calculation model, Ventilation flow, Radioactivity sources

CLC Number: 

  • TL4