Document: NUREG-0800
Document ID: 1dbfaffa-d13d-47e0-9536-f667eb85f6b8
Document Type: srp
Title: CONDENSATE AND FEEDWATER SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350091.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.4.7
CFR Part: 
CFR Title: 

Content:
and OL applicants need not comply with the provisions of this revision. (b) CP applicants will be required to comply with the provisions of this revision. (c) It should be noted that steam generators in operating plants and NTOL's where a SER has been issued, now comply with the revised BTP ASB 10-2. VI. REFERENCES 1. 10 CFR Part 50, Appendix A, General Design Criterion 2, "Design Bases for Protection Against Natural Phenomena." 2. 10 CFR Part 50, Appendix A, General Design Criterion 4, "Environmental and Missile Design Bases." 3. 10 CFR Part 50, Appendix A, General Design Criterion 5, "Sharing of Structures Systems and Components." 4. 10 CFR Part 50, Appendix A, General Design Criterion 44, "Cooling Water." 5. 10 CFR Part 50, Appendix A, General Design Criterion 45, "Inspection of Cooling Water System." 6. 10 CFR Part 50, Appendix A, General Design Criterion 46, "Testing of Cooling Water System." 7. Regulatory Guide 1.29, "Seismic Design Classification." 8. Branch Technical Position ASB 10-2, "Design Guidelines for Avoiding Water Hammer in Steam Generators." 10.4.7-7 Rev. 3 - April 1984 - - - . BRANCH TECHNICAL POSITION ASB 10-2 DESIGN GUIDELINES FOR AVOIDING WATER HAMMERS IN STEAM GENERATORS BACKGROUND Plant operational experience has shown that top-feed steam generators containing feedwater spargers with bottom drain holes incur steam condensation induced water hammers. This type of water hammer has frequently occurred after the feedwater sparger was uncovered (due to some plant transient) and cold auxiliary feedwater flow was subsequently initiated. The initiation of the auxiliary feedwater flow into the steam generator produces a water slug in the sparger or feedwater piping, which is then accelerated by the unbalanced pressures produced by the condensation of a steam pocket in the line. The resultant impulse could be of a sufficient magnitude to cause damage to the steam generator internal components and feedwater systems piping. The most damaging of such