HKNIC - Annual Environmental Hightlights
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Annual Environmental Hightlights
Since commencement of commercial operation in 1994, Daya Bay's radiological discharge into the environment has been well within the criteria set by national monitoring authorities. It has made continuous effort to improve its environmental performance by using better technology and improved operations, so as to further reduce its radiological release and thereby the resulting environmental impact.

According to national regulatory limits, radiological releases from the Daya Bay site should not expose the nearby public to a radiation dosage of 0.25 millisievert per year. This should be compared with an average annual dosage of around 0.5 millisieverts for the Hong Kong public from all artificial sources (mainly due to medical treatment and diagnosis) and of about 3.0 millisieverts from various natural sources. Since the actual releases at the Daya Bay site are much lower than the permitted amounts, the effective dose of the most exposed members of the public are very much lower.

Though the release of liquid tritium has reached a relatively high percentage of its annual regulatory limits, tritium has a low radio-toxicity and does not accumulate in the body. The actual releases of GNPS' other radionuclides are no higher than about 0.2% of their annual limits, the effective dose for the most exposed member of the public should be no higher than about 0.0006 mSv/year. The figure is less than that of radiation coming from 30 minutes of commercial flight per year.
 
annual gaseous
Note: The annual regulatory limits were revised in 2013. Please see "Radioactive Releases" for the limits.
 
annual liquid
Note: The annual regulatory limits were revised in 2013. Please see "Radioactive Releases" for the limits.
 
  Radioactivity in environmental samples around Daya Bay
farm product
* Typical radioactivity of Potassium (containing a natural radionuclide) measures 20-120 Bq/kg in these samples. Pine needle is found to have a higher radioactivity than other samples. It reflects a higher uptake by pine tree than other sample species of radioactive substances that are similar to the chemicals needed for growth.
 
marine sample
* Typical radioactivity of Potassium (containing a natural radionuclide) measures 50-500 Bq/kg in these samples.
 
water sample
 
concentrate water
* Reference data taken in 1976-1979 was measured in Chinese coastal seas and provides some useful comparison.