Document: NRC Regulatory Guide
Document ID: a12b2f8d-d334-4fb6-8a51-8bf551a23833
Document Type: regulatory_guide
Title: Surveillance Program for New Fuel Assembly Designs
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1335/ML13350A277.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.119
CFR Part: 
CFR Title: 

Content:
iques used by the stiff in evatu The guldes are issued in the following tn broad divisions sting specific problems or postulated acctdents. or to provide guidance to appht &ntsi. Regulatory Guides ate not substltutes fot regulations, and compliance 1. Power Reactors S Products with them It not required. Methods and solutions different fone those Sto out in 2. Research and Test Reactors 7 Transportation the guides will be acceptable if they provide a basis fto th, findings requisite to 3 F u si and Materials Facilities S Occupatliont Health the Issuance or continuance of a permit or license by the Commission 4 EnvItonmental and Siting' S Antittust Review Comments end suggestions for Improvements in these guides are encouraged S Materials end Plant Plotection 10 General at a.. times, and guides will be revised, as appropriate, to accommodate corn meets and to falleta new inlormation or esprelence. However. commerinr ono Copies of published guides may be obtained bV written tequest indicating the this guide. if received within about two months alter its Issuance will t- par divisrons desired to the U.S Nuclear Regulatory Commission Washington..D C ticulartly useful in evaluating the need for an early revision Z056. Attention. ODiector. Office of Standards Development mechanical properties of the cladding. The integrity of the fuel rods can be ensured through proper design by using acceptable mechanical behavior models for fuel and cladding and thermal performance models for fuel rods and by maintaining an adequate margin between the limiting fuel rod stresses, strains, and temperatures and the values calculated for steady-state and transient conditions. Among other things, designers should consider limits on fuel rod bowing, linear power, internal pres- sure, rate of power increase, coolant temperature, and coolant pressure. Surveillance of fuel assemblies in operating reactors has proved successful in uncovering unpredicted behavior such as fuel densification, channel