[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: 40CFR194.34]

[Page 52]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 194_CRITERIA FOR THE CERTIFICATION AND RE-CERTIFICATION OF THE WASTE 
ISOLATION PILOT PLANT'S COMPLIANCE WITH THE 40 CFR PART 191 DISPOSAL 
REGULATIONS--Table of Contents
 
         Subpart C_Compliance Certification and Re-certification
 
Sec. 194.34  Results of performance assessments.

    (a) The results of performance assessments shall be assembled into 
``complementary, cumulative distribution functions'' (CCDFs) that 
represent the probability of exceeding various levels of cumulative 
release caused by all significant processes and events.
    (b) Probability distributions for uncertain disposal system 
parameter values used in performance assessments shall be developed and 
documented in any compliance application.
    (c) Computational techniques, which draw random samples from across 
the entire range of the probability distributions developed pursuant to 
paragraph (b) of this section, shall be used in generating CCDFs and 
shall be documented in any compliance application.
    (d) The number of CCDFs generated shall be large enough such that, 
at cumulative releases of 1 and 10, the maximum CCDF generated exceeds 
the 99th percentile of the population of CCDFs with at least a 0.95 
probability. Values of cumulative release shall be calculated according 
to Note 6 of Table 1, appendix A of part 191 of this chapter.
    (e) Any compliance application shall display the full range of CCDFs 
generated.
    (f) Any compliance application shall provide information which 
demonstrates that there is at least a 95 percent level of statistical 
confidence that the mean of the population of CCDFs meets the 
containment requirements of Sec. 191.13 of this chapter.

                         Assurance Requirements