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Regulations (10 CFR) > Part
Index > § 63.331--Separate standards for
protection of ground water
§63.331--Separate standards for protection of ground water.
DOE must demonstrate that there is a reasonable expectation that, for
10,000 years of undisturbed performance after disposal, releases of
radionuclides from waste in the Yucca Mountain disposal system into the
accessible environment will not cause the level of radioactivity in the
representative volume of ground water to exceed the limits in the
following Table 1:
Table 1.--Limits on Radionuclides
| Radionuclide |
Type of Radiation emitted |
Limit is natural background? |
| Combined radium-226 and radium-228 |
5 picocuries per liter |
Yes |
| Gross alpha activity (including radium-226 but excluding radon
and uranium) |
15 picocuries per liter |
Yes |
| Combined beta and photon emitting radionuclides |
0.04 mSv (4mrem) per year to the whole body or any organ, based
on drinking 2 liters of water per day from the representative
volume |
No | | 
