Document: NUREG-0800
Document ID: d2857477-655b-4e97-aa7c-3321de2d556e
Document Type: srp
Title: CONTROL ROD DRIVE SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0631/ML063190004.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.4
CFR Part: 
CFR Title: 

Content:
meets or exceeds the acceptable owner’s group classifications and criteria discussed in the enclosure to Generic Letter 86-01 to ensure that breaks and through wall cracks in the piping need not be postulated. The reviewer also verifies that acceptable commitments are made regarding associated inspections, 3.9.4-9 Revision 3 - March 2007 periodic visual verification of the scram system piping integrity, and actions in response to detected leakage to adequately address prevention and mitigation of the effects of leakage associated with potential failures of this piping. For BWR CRDS that include a control rod drive return line, the reviewer verifies acceptable commitments for the return line design and its implementation in accordance with Generic Letter 80-95 and Part II, Section 8 of NUREG-0619. The choice of structural materials of construction for the CRDS is reviewed in SRP Section 4.5.1. 3. Loading combinations are defined as those loadings associated with plant operations that are expected to occur one or more times during the lifetime of the plant and include, but are not limited to, loss of power to all recirculation pumps, tripping of the turbine generator set, isolation of the main condenser, and loss of all offsite power, combined with loadings caused by natural or accident events including water hammer loads for BWRs. The load combinations that are postulated to occur are specified for each of the design and service conditions as defined in Paragraph NB-3113 of the ASME Code. These load combinations are defined in SRP Section 3.9.3 and are part of the review. The design stress limits, including fatigue limits and deformation limits appropriate to the components of the CRDM, are compared to the limits of specified codes, previously designed and successfully operating systems, or the results of scale model and prototype testing programs. 4. The CRDM of a new design or configuration should be subjected to a life cycle test program to determine the