ML050970476
| ML050970476 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 03/31/2005 |
| From: | Archie J, Lavigne D, Andrea Torres South Carolina Electric & Gas Co |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML050970466 | List: |
| References | |
| Download: ML050970476 (41) | |
Text
V. C. Summer Nuclear Station V. C. Summer Nuclear Station RF RF--15 Outage Information 15 Outage Information
Introduction Introduction-- Jeff Archie Jeff Archie Refuel 15 Refuel 15-- Alan Torres Alan Torres Corrective Action Corrective Action-- Dave Lavigne Dave Lavigne
Refuel Refuel--15 Goals 15 Goals 3/4 3/4 Duration: 35 Days Duration: 35 Days 3/4 3/4 Human Performance Events:
Human Performance Events: << 11 3/4 3/4 Recordable Injuries:
Recordable Injuries: << 11 3/4 3/4 Significant/Noteworthy Events: 0 Significant/Noteworthy Events: 0 3/4 3/4 Post 100%
Post 100% -- 90 Day Capacity: 96%
90 Day Capacity: 96%
3/4 3/4 Dose: 110 REM (to be adjusted based on Dose: 110 REM (to be adjusted based on source term) source term)
Refuel Refuel--15 Major Modifications 15 Major Modifications 3/4 3/4 Main Generator Rewind Main Generator Rewind 3/4 3/4 RWST Automatic Swapover Logic RWST Automatic Swapover Logic 3/4 3/4 B RHR Pump Improved Shaft Design B RHR Pump Improved Shaft Design 3/4 3/4 CCW Crosstrain Relief Valve CCW Crosstrain Relief Valve 3/4 3/4 IPCS Replacement IPCS Replacement
Refuel Refuel--15 Major Modifications 15 Major Modifications 3/4 3/4 B RCP Flange Bolt Replacement B RCP Flange Bolt Replacement 3/4 3/4 RBCU Fan Motor Upgrades RBCU Fan Motor Upgrades 3/4 3/4 Install New 115KV Safety Power Feed to Install New 115KV Safety Power Feed to XSW XSW--1DX (Initial Work)
- 1DX (Initial Work) *
- To Provide for Decreased Core Damage
- To Provide for Decreased Core Damage Frequency Frequency
Refuel Refuel--15 Items of Interest 15 Items of Interest 3/4 3/4 Reactor Vessel Visual Inspection Reactor Vessel Visual Inspection 3/4 3/4 Pressurizer Nozzle Inspection Pressurizer Nozzle Inspection 3/4 3/4 Flow Accelerated Corrosion Expansion Flow Accelerated Corrosion Expansion 3/4 3/4 Emergency Feed Piping Cleaning and Emergency Feed Piping Cleaning and Inspection Inspection
Refuel Refuel--15 Items of Interest 15 Items of Interest 3/4 3/4 Fuel Leak Inspection Fuel Leak Inspection zz Vendor Completed Root Cause Vendor Completed Root Cause
- Cause found to be improper chiller operation Cause found to be improper chiller operation zz Flow Validation Flow Validation zz Enhanced Visual Inspection Enhanced Visual Inspection
Refuel 15 Refuel 15 3/4 3/4 Critical Path Activities Critical Path Activities zz Main Generator Rewind Main Generator Rewind zz B RCP Flange Leak Repair B RCP Flange Leak Repair zz Steam Generator Work (All Three SGs)
Steam Generator Work (All Three SGs)
- 100% Primary Side Tube Inspection 100% Primary Side Tube Inspection
- Secondary Inspections Secondary Inspections
- Install/Remove Nozzle Dams Install/Remove Nozzle Dams
Main Generator Main Generator Rewind Rewind
Close-fitting slot wedges, with radial filler strips and conforming strips, are used to anchor the bar in place.
The wedges butt end-to-end in the slot. Side ripple springs are provided to suppress bar movement in the core slots.
The side ripple springs exert a sideways force on the bars, while the wedges, fillers and top ripple springs exert a radial force on the bars.
Photo 1 shows the existing generator windings Photo 1 shows the existing generator windings with the generator rotor removed.
with the generator rotor removed.
Photo 2 shows the endwindings being cut off of the Photo 2 shows the endwindings being cut off of the old windings to facilitate bar removal.
old windings to facilitate bar removal.
Photo 7 shows the new windings fully installed and painted.
Photo 7 shows the new windings fully installed and painted.
Reactor Coolant Reactor Coolant Pump Flange Pump Flange Gasket Gasket Replacement Replacement
Main Flange Leakage during RF14 Main Flange Leakage on B RCP located just below CCW inlet line. Not considered pressure boundary leakage, but is RCS leakage.
Main Flange Bolts are carbon steel and susceptible to Boric Acid corrosion; all other RCP materials are stainless steel.
Leakage Location on B RCP The leakage was initially discovered in RF14, so attempts were made to eliminate the leakage by de-tensioning the 24 main flange bolts then re-stretching them to tighten the joint. The leakage returned during startup, therefore gasket replacement is necessary.
Turning Vane Diffuser Adapter Diffuser Te eliminate main flange leakage, pump internals must be removed and two gaskets must be replaced.
Gasket Locations RCP Internal Components Main Flange Thermal Barrier Problems with Turning Vane to Thermal barrier bolts or Diffuser Adapter cap screws could lead to replacement of entire assembly during RF15.
RCP RCP--33
B RHR Pump B RHR Pump Modification Modification
Brief Overview of RHR Project Brief Overview of RHR Project 3/4 3/4 A RHR Pump Modification (RF A RHR Pump Modification (RF--14) 14) zz Spacer coupling Spacer coupling zz Upper & lower Hub Assembly Upper & lower Hub Assembly zz ALARA estimate 2.75 R, Actual.725 R ALARA estimate 2.75 R, Actual.725 R 3/4 3/4 A RHR vent addition (RF A RHR vent addition (RF--14) 14) zz ALARA estimate 1.1 R, Actual.590 R ALARA estimate 1.1 R, Actual.590 R 3/4 3/4 B RHR to Be Performed in RF B RHR to Be Performed in RF--15 15
Modified 8X20 WD/WDF Modified 8X20 WD/WDF 18 by 18 opening Support stand with an 18 X 18 opening seal Bearing Housing
The Spacer Coupling The Spacer Coupling Upper (Driver)
Hub Assembly Lower (Pump)
Hub Assembly
Steam Generator Steam Generator Inspections Inspections
Program Program Enhancements Enhancements
Refuel Refuel--15 Program Improvements 15 Program Improvements 3/4 3/4 Program Changes Program Changes zz ISP ISP--27, Electrical Safety 27, Electrical Safety zz FME Controls FME Controls zz Confined Space Program Confined Space Program zz Contractor Controls Contractor Controls
RF RF--15 Performance Improvements 15 Performance Improvements 3/4 3/4 Operating Experience Books Operating Experience Books 3/4 3/4 Daily Talking Points Daily Talking Points 3/4 3/4 Weekly Outage Newsletter Weekly Outage Newsletter 3/4 3/4 Rewarded Behaviors Program Utilize Rewarded Behaviors Program Utilize Human Performance Error Reduction Human Performance Error Reduction Tools Tools
Observations & Trending Observations & Trending 3/4 3/4 Focused observations will be Focused observations will be conducted during RF conducted during RF--15 based on 15 based on challenges identified in RF challenges identified in RF--14 14 3/4 3/4 Feedback and Coaching is expected Feedback and Coaching is expected 3/4 3/4 Trend Wall insights using CER and Trend Wall insights using CER and Observation data will be communicated Observation data will be communicated weekly weekly
QUESTIONS QUESTIONS