Document: NUREG-0800
Document ID: 49aefb86-1adb-4b3c-826f-480e32947595
Document Type: srp
Title: Radiological Consequence Analyses Using Alternative Source Terms
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0037/ML003734190.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.0.1
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CFR Title: 

Content:
pressure that might exist at 5 seconds? Can the ductwork downstream of this damper withstand the increased pressure? If the damper could not close, dose calculations against the TEDE criteria would be warranted. c. All affected analyses should be reevaluated and the applicable design bases updated. d. If a particular analysis is to be recalculated, all affected assumptions and inputs should be updated and all selected characteristics of the AST and the TEDE criteria that will become part of the design basis should be addressed. e. The licensee may use technically justifiable sensitivity or scoping evaluations to demonstrate that results from affected analyses calculated using the previous accident source term and previous dose criteria would bound the results obtained using the AST and the TEDE criteria. In this case, the affected analyses need not be updated. However, the reviewer should ensure that the licensee has made a commitment to update the design basis to indicate that the selected AST characteristics and TEDE criteria have superseded the prior source term and dose criteria. For example: (1) As part of an AST implementation, the licensee has reanalyzed the dose for the most limiting component using the proposed AST and determined that the integrated dose would not increase by more that 20 percent. All of the licensee’s existing EQ calculations include a designer’s margin of a factor of two. Does the licensee need to re-calculate any additional EQ analyses? What is the design basis for the remaining analyses? 15.0.1-12 Rev. 0 -- July 2000 Answer: As long as the licensee has adequately identified the limiting case and the sensitivity analysis is sufficiently generic, the evaluation is appropriate and no further reanalysis is necessary. In this case, the licensee has been able to demonstrate that the existing analyses are bounding and would yield acceptable results if recalculated using the proposed AST. However, the design basis now incorporates the AST,