Document: NUREG-0800
Document ID: 7c7e043f-0cf6-4d85-ad06-3f01128bc7f8
Document Type: srp
Title: (ENiCrFe-7), and 5.14 (ERNiCrFe-7)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380192.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.11
CFR Part: 
CFR Title: 

Content:
(The tube support plates will be designed and manufactured with noncircular holes (e.g., a quatrefoil-shaped hole) that only come in close contact with the tube at a limited number of locations around the tube’s circumference. The noncircular hole design promotes high-velocity flow along the tube, sweeping impurities away from the support plate locations.)* (The tube support structure manufacture will use a lattice grid design. This design (1) eliminates the narrow annular gap at the tube supports because the support may contact the tube at only four lines on the tube circumference and (2) provides almost complete washing of the tube surface with steam generator water.)* (The U-bend region of short-radius tubes will be stress-relieved after bending to reduce the residual stresses in this portion of the tube.)* 5. The fracture toughness of the ferritic materials is acceptable because they conform with 10 CFR 50.55a, Appendix G to the ASME Code, and Appendix G to 10 CFR Part 50. 6. The welding of the ferritic materials of the steam generator is acceptable because it is performed in accordance with 10 CFR 50.55a, paragraph D-1210 of Appendix D to Section III of the ASME Code, and Regulatory Guides 1.34, 1.43, 1.50, and 1.71. (The fabrication and processing of austenitic stainless steel is acceptable because these activities are performed in accordance with 10 CFR 50.55a and Regulatory Guides 1.31, 1.34, 1.36, 1.37, 1.44, and 1.71. In addition, the guidance in NUREG-0313 will be followed, and the yield strength of austenitic stainless steel will be limited to 620 MPa (90,000 psi).)* 7. The requirements of Appendix B to 10 CFR Part 50 have been met with respect to onsite cleaning because the onsite cleaning and cleanliness controls during fabrication will conform to the recommendations of Regulatory Guide 1.37. The controls placed on the secondary coolant chemistry are in agreement with the staff’s technical position, and the additives to be used will limit the