{"data":{"id":"us/10-cfr-63.331","jurisdiction":"us","citation":"10 CFR 63.331","heading":"Separate standards for protection of groundwater.","body":"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 groundwater to exceed the limits in the following Table 1:\nTable 1—Limits on Radionuclides in the Representative Volume\nRadionuclide or type of radiation emitted Limit Is natural background included?\nCombined radium-226 and radium-228 5 picocuries per liter Yes.\nGross alpha activity (including radium-226 but excluding radon and uranium) 15 picocuries per liter Yes.\nCombined beta and photon emitting radionuclides 0.04 mSv (4 mrem) per year to the whole body or any organ, based on drinking 2 liters of water per day from the representative volume No.","path":["Title 10—Energy","CHAPTER I—NUCLEAR REGULATORY COMMISSION","PART 63—DISPOSAL OF HIGH-LEVEL RADIOACTIVE WASTES IN A GEOLOGIC REPOSITORY AT YUCCA MOUNTAIN, NEVADA","Subpart L—Postclosure Public Health and Environmental Standards"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-10.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:09Z","sha256":"cc98da22b4e34d3a80b4aa75178a599b6839193a97725070bdb7d6646d32984f","source_id":"us-cfr","stale":true,"prev":"us/10-cfr-63.322","next":"us/10-cfr-63.332"},"notice":"GroundRules: Original legal text. Not legal advice."}