[Code of Federal Regulations]
[Title 40, Volume 22]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR197.26]

[Page 64]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 197--PUBLIC HEALTH AND ENVIRONMENTAL RADIATION PROTECTION STANDARDS 
FOR YUCCA MOUNTAIN, NEVADA--Table of Contents
 
    Subpart B--Public Health and Environmental Standards for Disposal
 
Sec. 197.26  What are the circumstances of the human intrusion?

    For the purposes of the analysis of human intrusion, DOE must make 
the following assumptions:
    (a) There is a single human intrusion as a result of exploratory 
drilling for ground water;
    (b) The intruders drill a borehole directly through a degraded waste 
package into the uppermost aquifer underlying the Yucca Mountain 
repository;
    (c) The drillers use the common techniques and practices that are 
currently employed in exploratory drilling for ground water in the 
region surrounding Yucca Mountain;
    (d) Careful sealing of the borehole does not occur, instead natural 
degradation processes gradually modify the borehole;
    (e) Only releases of radionuclides that occur as a result of the 
intrusion and that are transported through the resulting borehole to the 
saturated zone are projected; and
    (f) No releases are included which are caused by unlikely natural 
processes and events.

                    Ground Water Protection Standards