ML040980526
| ML040980526 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 03/11/2004 |
| From: | Jordan T South Texas |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| RIC 2004 | |
| Download: ML040980526 (12) | |
Text
RIC 2004: Emergent Technical Issues, Session T-11 Bottom Mounted Instrumentation Experience Tom Jordan, VP Engineering & Technical Services RIC 2004: Emergent Technical Issues, Session T-11 Bottom Mounted Instrumentation Experience Tom Jordan, VP Engineering & Technical Services STP Nuclear Operating Company March 11, 2004 STP Nuclear Operating Company March 11, 2004
2 Bottom Mounted Instrumentation (BMI) Leakage Unit 1 Bottom Mounted Instrumentation (BMI) Leakage Unit 1
On April 12th leakage identified via boric acid walk down inspections
Total boric acid crystal for both penetrations = 153mg
On April 12th leakage identified via On April 12th leakage identified via boric acid walk down inspections boric acid walk down inspections
Total boric acid crystal for both Total boric acid crystal for both penetrations = 153mg penetrations = 153mg
3 BMI Paradigms BMI Paradigms
Nuclear safety first
Think 40 years not 40 days
Pace the team
Industry key stakeholder involvement
Demonstrate conservative operational decision making
Establish Detailed Communication Plan
Nuclear safety first
Think 40 years not 40 days
Pace the team
Industry key stakeholder involvement
Demonstrate conservative operational decision making
Establish Detailed Communication Plan
4 STP BMI Penetration #1 As Found STP BMI Penetration #1 As Found
5 Examination Scope Examination Scope
Ultrasonic examination (UT) from penetration tube ID
Enhanced visual exam of J-groove weld surface
Volumetrically interrogate vessel base metal for wastage
Eddy current examination (ET) from penetration tube ID
Profilometry [tube inside roundness / ovality]
Borescope [tube inside visual] examinations
Helium tests
Metallurgical analyses of removed nozzle remnants
Boat sample analyses
Ultrasonic examination (UT) from penetration tube ID Ultrasonic examination (UT) from penetration tube ID
Enhanced visual exam of J Enhanced visual exam of J--groove weld surface groove weld surface
Volumetrically interrogate vessel base metal for wastage Volumetrically interrogate vessel base metal for wastage
Eddy current examination (ET) from penetration tube ID Eddy current examination (ET) from penetration tube ID
ET of J ET of J--groove weld surface groove weld surface
Profilometry Profilometry [tube inside roundness /
[tube inside roundness / ovality ovality))
Borescope Borescope [tube inside visual] examinations
[tube inside visual] examinations
Metallurgical analyses of removed nozzle remnants Metallurgical analyses of removed nozzle remnants
Boat sample analyses Boat sample analyses
6 Leak Axial Crack in Nozzle and/or Weld PWSCC Nozzle and/or Weld Low-Cycle Fatigue Nozzle or Weld PWSCC Nozzle and/or Weld Fabrication Flaw Over-Stress Nozzle and/or Weld Crack Initiation Crack Propagation Consequences STP Unit 1 BMI Flaw Investigation July 8, 2003 Results Investigation Results Investigation Results
7 Permanent Half-Nozzle Repair Permanent Half-Nozzle Repair
8 Completed Repair Completed Repair
9 Future Inspections BMI Commitments
Both Units: Boric Acid Walkdown Inspection (VT)
Unit 1:
- Volumetric (UT)/Enhanced (VT) all penetrations
- Phased Array - (UT) of 1 or 46 (Inspection for Corrosion)
Unit 2:
- Boric Acid Walkdown Inspection (VT)
- Volumetric (UT)
10 Future Inspections Reactor Head Penetrations Both Units
Bare Metal Visual
Volumetric Examinations Material Reliability Program (MRP) Recommended Bare Metal Visual Inspection of Safe Ends
- RV Hot/Cold Legs
- Przr Surge
- Pzr Safety,Relief(3),Spray Nozzles
11 Alloy 600 Life Cycle Management
Identify Locations
Perform Risk Assessment/Life Cycle Management Study for Strategic Direction
Contingency Plans
Perform Inspections
12 BMI Summary BMI Summary
Demonstrated long term operational decision making
Created new technology
Employed industry best expertise
Strong teamwork and safety culture provided the foundation for our success
Demonstrated long term operational Demonstrated long term operational decision making decision making
Created new technology Created new technology
Employed industry best expertise Employed industry best expertise
Strong teamwork and safety culture Strong teamwork and safety culture provided the foundation for our success provided the foundation for our success