[Code of Federal Regulations]
[Title 40, Volume 24]
[Revised as of July 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR191.13]

[Page 10-11]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 191_ENVIRONMENTAL RADIATION PROTECTION STANDARDS FOR MANAGEMENT AND 
DISPOSAL OF SPENT NUCLEAR FUEL, HIGH-LEVEL AND TRANSURANIC RADIOACTIVE 
WASTES--Table of Contents
 
             Subpart B_Environmental Standards for Disposal
 
Sec. 191.13  Containment requirements.

    (a) Disposal systems for spent nuclear fuel or high-level or 
transuranic radioactive wastes shall be designed to provide a reasonable 
expectation, based upon performance assessments, that the cumulative 
releases of radionuclides to the accessible environment for 10,000 years 
after disposal from all significant processes and events that may affect 
the disposal system shall:
    (1) Have a likelihood of less than one chance in 10 of exceeding the 
quantities calculated according to Table 1 (appendix A); and
    (2) Have a likelihood of less than one chance in 1,000 of exceeding 
ten times the quantities calculated according to Table 1 (appendix A).
    (b) Performance assessments need not provide complete assurance that 
the requirements of Sec. 191.13(a) will be met. Because of the long 
time period involved and the nature of the events and processes of 
interest, there will inevitably be substantial uncertainties in 
projecting disposal system performance. Proof of the future performance 
of a disposal system is not to be had in the ordinary sense of the word 
in situations that deal with much shorter time frames. Instead, what is 
required is a reasonable expectation, on the basis of the record before 
the implementing

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agency, that compliance with Sec. 191.13 (a) will be achieved.