ML21286A229

Amendment 29 to Updated Final Safety Analysis Report, Appendix M, Report on Pipe Failures Outside Containment in the Browns Ferry Nuclear Plant, Table of Contents

ML21286A229
Person / Time
Site:	Browns Ferry
Issue date:	10/04/2021
From:	Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation
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Download: ML21286A229 (3)

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BFN-25 M.0-i APPENDIX M REPORT ON PIPE FAILURES OUTSIDE CONTAINMENT IN THE BROWNS FERRY NUCLEAR PLANT TABLE OF CONTENTS M.1 Introduction..................................................................................................................................... M.0-1 M.2 Pressure Analyses.......................................................................................................................... M.0-2 M.3 Piping Design Philosophy............................................................................................................... M.0-6 M.3.1 Piping From Reactor Vessel Through the Anchor Outside the Drywell............................. M.0-6 M.3.2 Piping From the Anchor Through Turbine Inset or Feedwater Pump Discharge............... M.0-7 M.4 Breaks Postulated and Loading Effects Considered....................................................................... M.0-7 M.5 Pipe Rupture Loads........................................................................................................................ M.0-8 M.5.1 Critical Crack Size Loading............................................................................................... M.0-9 M.5.2 Jet Expansion Considerations........................................................................................... M.0-10 M.5.3 Jet Impingement Loads..................................................................................................... M.0-11 M.5.4 Break Size......................................................................................................................... M.0-12 M.6 Pipe Break Assumptions, Analysis, and Break Locations............................................................... M.0-12 M.6.1 Pipe Rupture Analysis....................................................................................................... M.0-12 M.6.2 Case I - Circumferential Break Postulated at Point 1........................................................ M.0-13 M.6.3 Case II - Circumferential Break Postulated at Points 2 and 3............................................ M.0-13 M.6.4 Case III - Circumferential Break Postulated at Points 4 and 5........................................... M.0-14 M.6.5 Case IV - Longitudinal Break Postulated at Point 1........................................................... M.0-14 M.6.6 Case V - Longitudinal Breaks Postulated at and Between Points 2 and 3........................ M.0-16 M.6.7 Case VI - Longitudinal Break Postulated at the Elbow in Main Steam Lines (Turbine Building).............................................................................................................. M.0-16 M.6.8 Case VII - Critical Crack Loading...................................................................................... M.0-18 M.6.9 Additional High Energy Line Break Analysis...................................................................... M.0-19 M.7 Structural Analysis.......................................................................................................................... M.0-22 M.8 Effects on Safety-Related Components and Structures.................................................................. M.0-23 M.9 Additional Work............................................................................................................................... M.0-25 M.10 Summary and Conclusions............................................................................................................. M.0-25 M.11 References...................................................................................................................................... M.0-26

BFN-25 M.0-ii APPENDIX M LIST OF TABLES Table Title M.0-1 Deleted M.0-2 Deleted

BFN-25 M.0-iii LIST OF FIGURES APPENDIX M LIST OF FIGURES Figure Title M.0-1 Pipe Failure Analysis - Main Steam and Feedwater Vault Enclosure M.0-2 Main Steam line Break Accident Mass of Coolant Lost Through Break M.0-3 Jet Loading Model M.0-4 Steam line Break Locations in Steam Vault M.0-5 Feedwater Line Break Locations in Steam Vault M.0-6 Jet Impingement Loading on RCIC Pump Discharge Line M.0-7 Pipe Impact Analytical Model for Worst Pipe Break Inside Turbine Building