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Technical and Regulatory Bases for Regulatory Guide 1.236, PWR Control Rod Ejection and BWR Control Rod Drop Accidents (NUREG/KM-0019)

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Publication Information

Manuscript Completed: June 2024 
Date Published: June 2024 

Prepared by:
P. Clifford (Retired)
J. Messina

Office of Nuclear Reactor Regulation
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

The purpose of this report is to document the technical and regulatory bases for the acceptance criteria and guidance provided in Regulatory Guide 1.236, “Pressurized-Water Reactor Control Rod Ejection and Boiling-Water Reactor Control Rod Drop Accidents.” Pressurized-water reactor control rod ejection and boiling-water reactor control rod drop accidents are low-probability events involving a sudden and rapid insertion of positive reactivity. These postulated accidents are safety significant because of their potential ability to cause significant core damage and challenge the integrity of the reactor coolant pressure boundary. This report identifies regulatory requirements, details the existing empirical database of fuel performance under rapid power excursion testing, and documents the technical bases of the analytical limits and guidance that satisfy the regulations.

Page Last Reviewed/Updated Tuesday, June 25, 2024