LP Feedwater Heater Tube Failure Point Beach Nuclear Plant

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Presentation transcript:

LP Feedwater Heater Tube Failure Point Beach Nuclear Plant Kelly Oetting System Engineer FSRUG 2015 Conference January 26-29, 2015

2011 Power Uprate Westinghouse 2 – Loop PWR, Unit 1 1970, Unit 2 1972 17% 545 MWe to 637 MWe (1540 MWth to 1800 MWth) Unit 2 – 120 Days (3/1/11 - 6/19/11) Unit 1 – 75 Days (10/3/11 – 12/17/11) Approximately 35 Major Modifications for Each Unit New FWHs 5 Stages, Two Trains (4 LP & 1 HP FWH/Train)

New #1 & #2 Duplex LP FWH

FWH Design Change Details Before EPU After EPU #1 & #2 LP FWHs Westinghouse (shell) Southwest Eng. (tube bundle) Yuba Length 41 ft 9 in 49 ft Diameter 68 in 79.25 in Heat Transfer #1 147,500,000 Btu/hr 141,100,000 Btu/hr Heat Transfer #2 116,700,000 Btu/hr 126,600,000 Btu/hr

#2 FWH Tube Failures April 2014 - #1&#2 Drain valves started opening more May 2014 - #1&#2 Dump Valve started to open Step change down in #2 drain temperature Monitored until October 2014 Refueling outage Found 6 tubes leaking in #2 FWH 2 tubes sheared off Stabilizers installed in 14 tubes 16 tubes plugged

Motor Bearing Housing Sightglass

Potential Causes Water level too low – knee test never performed Drain piping and/or drain valve sized too small

Actions Raised level in all #1, #2, and #3 FWHs Will be pursuing a study of the drain piping.