Radiation Dose Calculations for a Hypothetical Accident in Xianning Nuclear Power Plant

Abstract

Atmospheric dispersion modeling and radiation dose calculations have been performed for a hypothetical AP1000 SGTR accident by HotSpot code 3.03. TEDE, the respiratory time-integrated air concentration, and the ground deposition are calculated for various atmospheric stability classes, Pasquill stability categories A–F with site-specific averaged meteorological conditions. The results indicate that the maximum plume centerline ground deposition value of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mn fontstyle="italic">1.2</mml:mn><mml:mi>E</mml:mi><mml:mo>+</mml:mo><mml:mn fontstyle="italic">2</mml:mn></mml:math> kBq/m 2 occurred at about 1.4 km and the maximum TEDE value of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mml:mn fontstyle="italic">1.41</mml:mn><mml:mi>E</mml:mi><mml:mo>-</mml:mo><mml:mn fontstyle="italic">0</mml:mn><mml:mn fontstyle="italic">5</mml:mn></mml:math> Sv occurred at 1.4 km from the reactor. It is still far below the annual regulatory limits of 1 mSv for the public as set in IAEA Safety Report Series number 115. The released radionuclides might be transported to long distances but will not have any harmful effect on the public.