# Regulatory Guide: Use of Plant Parameter Envelope in Early Site Permit Applications for Nuclear Power Plants
> **Nuclear Regulatory Commission** · Final guide; issuance. · Published 2023-07-25 · 88 FR 47755
## Document
- **Document number:** 2023-15692
- **Category:** nuclear-licensing
- **Sub-agency:** Nuclear Regulatory Commission
- **Federal Register citation:** 88 FR 47755
- **CFR reference:** 10 CFR 51
- **Publication date:** 2023-07-25
- **Energy docket:** NRC-2021-0091
## Abstract

The U.S. Nuclear Regulatory Commission (NRC) is issuing a new Regulatory Guide (RG) 4.27, "Use of Plant Parameter Envelope in Early Site Permit Applications for Nuclear Power Plants." This RG provides guidance for nuclear power plant applicants that elect to use the plant parameter envelope concept to assume certain design parameters for an early site permit application when a specific reactor technology has not been selected for a proposed site.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/07/25/2023-15692/regulatory-guide-use-of-plant-parameter-envelope-in-early-site-permit-applications-for-nuclear-power)
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