[Federal Register Volume 85, Number 119 (Friday, June 19, 2020)]
[Pages 37118-37119]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2020-13258]




Assumptions Used for Evaluating a Control Rod Ejection Accident 
for Pressurized Water Reactors

AGENCY: Nuclear Regulatory Commission.

ACTION: Regulatory guide; withdrawal.


SUMMARY: The U.S. Nuclear Regulatory Commission (NRC) is withdrawing 
regulatory guide (RG) 1.77, ``Assumptions Used for Evaluating a Control 
Rod Ejection Accident for Pressurized Water Reactors.'' This RG is 
being withdrawn because its guidance has been incorporated into a new 
RG, RG 1.236, ``Pressurized-Water Reactor Control Rod Ejection and 
Boiling-Water Reactor Control Rod Drop Accidents.''

DATES: The withdrawal of RG 1.77 takes effect on June 19, 2020.

ADDRESSES: Please refer to Docket ID NRC-2020-0083 when contacting the 
NRC about the availability of information regarding this document. You 
may obtain publicly-available information related to this document 
using any of the following methods:
     Federal Rulemaking Website: Go to https://www.regulations.gov and search for Docket ID NRC-2020-0083. Address 
questions about NRC docket IDs in Regulations.gov to Jennifer Borges; 
telephone: 301-287-9127; email: [email protected]. For technical 
questions, contact the individuals listed

[[Page 37119]]

in the FOR FURTHER INFORMATION CONTACT section of this document.
     NRC's Agencywide Documents Access and Management System 
(ADAMS): You may obtain publicly-available documents online in the 
ADAMS Public Documents collection at https://www.nrc.gov/reading-rm/adams.html. To begin the search, select ``Begin Web-based ADAMS 
Search.'' For problems with ADAMS, please contact the NRC's Public 
Document Room (PDR) reference staff at 1-800-397-4209, 301-415-4737, or 
by email to [email protected]. The basis for withdrawal of RG 1.77 
is available in ADAMS under Accession No. ML20084N202.

FOR FURTHER INFORMATION CONTACT: Paul Clifford, Office of Nuclear 
Reactor Regulation, telephone: 301-415-4043, email: 
[email protected] and Edward O'Donnell, Office of Nuclear 
Regulatory Research, telephone: 301-415-3317, email: 
[email protected]. Both are staff of the U.S. Nuclear Regulatory 
Commission, Washington, DC 20555-0001.


I. Introduction

    Regulatory guides may be withdrawn by the NRC when their guidance 
no longer provides useful information or is superseded by technological 
innovations, congressional actions, or other events. The NRC is 
withdrawing RG 1.77 because its guidance has been incorporated into RG 
1.236, ``Pressurized-Water Reactor Control Rod Ejection and Boiling-
Water Reactor Control Rod Drop Accidents'' (ADAMS Accession No. 
ML20055F490). The basis for withdrawal is found in ADAMS under 
Accession No. ML20084N202.

II. Further Information

    The withdrawal of RG 1.77 does not alter any prior or existing NRC 
licensing approval or the acceptability of licensee commitments to this 
RG. Although RG 1.77 is withdrawn, current licensees may continue to 
use it, and withdrawal does not affect any existing licenses or 
agreements. However, after the withdrawal of RG 1.77, licensees should 
use RG 1.236 in future requests or applications for NRC licensing 
actions related to the guidance in RG 1.77.

    Dated: June 16, 2020.

    For the Nuclear Regulatory Commission.
Meraj Rahimi,
Chief, Regulatory Guidance and Generic Issues Branch, Division of 
Engineering, Office of Nuclear Regulatory Research.
[FR Doc. 2020-13258 Filed 6-18-20; 8:45 am]