Document: NRC Regulatory Guide
Document ID: f0baf50b-5bb7-4783-b2f9-9586e09c97e1
Document Type: regulatory_guide
Title: Preparation of Environmental Reports for Nuclear Power Stations + HISTORY - HISTORY 02/2017 – DG-4026 , Proposed Revision 3 09/2014 – Periodic Review of Revision 2 – Revise (Rev. 3)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML1611/ML16116A068.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.2
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Content:
parameter envelope (PPE) design, a reactor that fits inside the bounding characteristics of the PPE. A PPE is a set of plant-design parameter values that an ESP applicant expects will bound the design characteristics of a reactor or reactors that might be constructed at a given site, and it serves as a surrogate for actual reactor design information. Use of this approach allows an ESP applicant to defer the decision on what reactor design to build to the COL stage. An applicant may use a PPE as a surrogate for design information to support demonstration of compliance with 10 CFR 52.17. The combination of site characteristics and PPE values will comprise the ESP bases that will be the focus for comparison in the event a COL application is submitted for the site. Nuclear Energy Institute (NEI) publication NEI 10-01, Revision 1, “Industry Guideline for Developing a Plant Parameter Envelope in Support of an Early Site Permit” (Ref. A4), describes the development and use of an ESP application from the industry’s perspective, including development of a PPE to bound multiple reactor designs. The PPE in NEI 10-01 is an example of the parameters needed for a PPE. However, not all parameters apply to all designs and additional parameters may be needed depending on the reactor designs that the PPE is bounding. An applicant for an ESP should review previous applications along with associated requests for additional information (RAIs) to gain an understanding of the level of detail needed to receive an ESP. For example, if a PPE is used for an ESP review, the applicant should address the assumptions for the reactor designs being evaluated and whether the designs are within the bounds of Table S-3. All the information described in Part C of this RG will be required for an ESP application with the following exceptions: • the ER need not include an assessment of the economic, technical, or other benefits (e.g., need for power) and costs of the proposed action • the ER