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| | number = ML061670325 | | | number = ML061670325 |
| | issue date = 06/14/2006 | | | issue date = 06/14/2006 |
| | title = 06/14/2006 Public Meeting Licensee Presentation Slides for Quad Cities End-of-Cycle Plant Performance Annual Assessment | | | title = Public Meeting Licensee Presentation Slides for Quad Cities End-of-Cycle Plant Performance Annual Assessment |
| | author name = Tulon T | | | author name = Tulon T |
| | author affiliation = Exelon Generation Co, LLC | | | author affiliation = Exelon Generation Co, LLC |
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Category:Slides and Viewgraphs
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[Table view] |
Text
Quad Cities Station Update End-of-Cycle Meeting June 14, 2006 Tim Tulon Site Vice President 1
Topics:
- The problem
- The fix
Extended Power Uprate Completed Objective - Increase total generation output on both reactors
- Produce 912 megawatts electric
- NRC approval in December 2001
- Unit 2 in March 2002
- Unit 1 in December 2002 3
The Problem Increased steam flow Increased acoustic loads Increased Increased steam Steam Dryer line piping loads vibrations Steam Dryer cracks ERV actuator damage 4
Finding the Source
- Unprecedented testing and analysis determined the source of the vibration to the standpipes on the steam lines where the valve attach to the piping.
- The length of the standpipe was increased to reduce the acoustics inside the pipe. --- ERV Similar to tuning a pipe organ, or blowing over the top of a Standpipe soda bottle.
5
State-of-the-Art Testing and Analysis Conducted to Validate Vibration Source
- Testing conducted in six states
- Scale models of actual Quad Cities reactor and piping utilized
- Shaker table testing conducted to duplicate actual vibration levels 6
Actions Taken to Correct Vibration Problem
- Installed New Steam Dryers
- More robust
- Installed Acoustic Side Branch Modification
- Retune the steam system
- Installed Upgraded Valve Actuators
- Hardened the actuator 7
New Steam Dryers
- Both Quad Cities steam dryers were replaced in early 2005 with a more robust design:
- Increased stress margins on steam dryers
- Instrumentation provided validation of design load
- Strain gauges provided stress data for analytical purposes 8
2006 Electromatic Relief Valve Upgrade
- Late 2005 issues were discovered with the actuators on the Electromatic Relief Valves (ERVs) due to vibration.
- The ERV actuators have now been replaced with more robust design:
- Several ERV actuator replacement options evaluated. New General Electric design proved to be most rigorous as validated with shaker table tests.
9
Shaker Table Testing ERV Actuator Testing ERV Testing 10
New ERV Actuator -vs- Previous New GE Design Previously Installed Design 11
2006 Acoustic Side Branch Modification Removing the Source of the Vibrations 12
2006 Acoustic Side Branch Modification
- Reduce dryer loading to increase stress margin for long-term operation of dryer
- Reduce overall MSL vibrations impacting ERV actuators and other attached main steam components
- Retuned the steam system 13
How Does the ASB Work?
The addition of the ASB increases the effective length of the ERV/SV standpipe, thereby decreasing the frequency of the acoustic standing wave. It is similar to a muffler, the ASB tunes the steam flow to reduce vibrations in the piping.
14
Acoustic Side Branch Mod ASBs Main Steam Safety Valve Electromatic Relief Valve 15
Unit 2 Startup Testing RESULTS:
Reduced to ~ 50% Original Licensed Thermal Power Levels.
- Meaning: today steam piping vibration levels at full-EPU power is approximately 50% than when the plant was first put in to commercial operation in 1972.
16
Typical Accelerometer Data Results Q2R18 Accelerometer Trends Target Rock Inlet Flange - X 0.4 3A Target Rock Inlet Flange X1 Historical (pre-ASB) EPU Value 0.35 Historical (pre-ASB) OLTP Value 3A Target Rock Inlet Flange X2 3A Target Rock Historical - X 0.3 0.25 Acceleration, grms 0.2 Last May w/o ASBs 0.15 With ASBs 0.1 0.05 0
0 500 1000 1500 2000 2500 3000 Core Thermal Power, MWt 17
Conclusions ASBs Work!
- The ASB modification effectiveness has been confirmed. This adds significant safety margin and substantially increased vibration tolerance to the steam dryer structural integrity and other main steam line components.
- Both units can operate safely and reliably at EPU power levels.
18
Radiation Exposure Efforts 19
Station Has Taken Aggressive Actions to Reduce Radiation Exposure
- Chemical decontamination of reactor piping on both units
- Replacement of turbine blades which contained high sources of Cobalt 60
- Improved worker training / increased awareness through individual dose goals 20
U2 Outage Dose Reduction Trend 600 rem Red Red line line represents represents 150 150 rem rem -- our our path path 500 rem to to full full INPO INPO points points 486.0 and and industry industry best best 400 rem 436.3 dose dose performance performance Dose (person-rem) 336.2 300 rem Industry Best 200 rem 190.0 162.0 100 rem 0 rem Q2R16 Q2R17 Q2R18 Q2R18 Q2R19 projected (2002) (2004) (2006) minus ASB / Dryer (2008) 21
Where Are We Going INPO Collective Radiation Exposure Point Performance 10 points 10.0 9.7 9 points Industry Best 8 points 7 points Red Red line line represents represents 6 points 150 150 rem rem -- our our path path 6.2 to to full full INPO INPO points points 5 points and and industry industry best best dose dose performance performance 4 points 3 points 2 points 1 points 0.0 0.0 0 points Current 2007 2008 2009 Full Points 22
Questions?
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