ML060030435

Rii Presentation Revised - RF-15 Outage Information

ML060030435
Person / Time
Site:	Summer
Issue date:	12/30/2005
From:	Andrea Torres South Carolina Electric & Gas Co
To:	Office of Nuclear Reactor Regulation
References
Download: ML060030435 (49)

Text

RF-15 Outage Information Alan Torres Planning and Scheduling

Refuel-15 Goals

• Duration: 35 Days/ Actual 39

• Human Performance Events: < 1/Actual 2

• Recordable Injuries: < 1/Actual 2

Refuel-15 Goals (Continued)

• Significant/Noteworthy Events: 0/1

• Post 100% - 90 Day Capacity: 95.5%

• Dose: 110 REM (to be adjusted based on source term)

- Actual 82rem

Refuel-15 Major Modifications

• Main Generator Rewind

• RWST Automatic Swapover Logic

• B RHR Pump Improved Shaft Design

• CCW Crosstrain Relief Valve

• IPCS Replacement

Refuel-15 Major Modifications

• B RCP Flange Bolt Replacement

• RBCU Fan Motor Upgrades

• Install New 115KV Safety Power Feed to XSW-1DX (Initial Work) *

• To Provide for Decreased Core Damage Frequency

Refuel-15 Items of Interest

• Reactor Vessel Visual Inspection

• Pressurizer Nozzle Inspection

• Flow Accelerated Corrosion Inspection Expansion

• Emergency Feed Piping Cleaning and Inspection

Refuel-15 Items of Interest

• Fuel Leak Inspection

- Vendor Completed Root Cause

• Cause was found to be improper chiller operation

• More than one leak was found in one pin

- Flow Validation

- Enhanced Visual Inspection

Main Generator 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 7 shows the new windings fully installed and painted.

Reactor Coolant Pump Flange Gasket 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.

RCP Internal Components Te eliminate main flange leakage, pump internals must be removed and two gaskets must be replaced.

Main Flange Gasket Locations Thermal Barrier Turning Vane Diffuser Diffuser Adapter

B RHR Pump Modification Brief Overview of RHR Project

• B RHR Pump Modification (RF-15)

- Spacer coupling

- Upper & lower Hub Assembly

- ALARA estimate 2.75 R, Actual 1.246 R

• B RHR vent modification

- ALARA estimate 1 R, Actual 416 MR

The Spacer Coupling Upper (Driver)

Hub Assembly Lower (Pump)

Hub Assembly

Steam Generator Inspections

Steam Generators

• Summary of Inspection

- No pluggable indications

- No significant wear

- Total sludge removed

• A 68lbs

• B 210lbs

• C 241lbs

- Overall health of generators is excellent

Program Enhancements Refuel-15 Program Enhancements

• Program Changes

- ISP-27, Electrical Safety

- FME Controls

- Confined Space Program

- Contractor Controls

RF-15 Performance Improvements

• Operating Experience Books

• Daily Talking Points

• Weekly Outage Newsletter

• Rewarded Behaviors Program Utilize Human Performance Error Reduction Tools

Questions?

V.C. Summer Station Recirculation Sump Design Changes Brad Stokes Design Engineering

Overview

• RF-15 Activities

• Analysis Results

• Refueling 16 Activities

• Outstanding Issues

RF-15 Activities

• Coatings Walkdown

• Dust Sampling

• Unqualified Materials

• Hold-up Volume

• Laser Scanning

Analysis Results

• ~1400 ft2 Strainer for Each Train

• 9.5 ft3 Fiber Load on the sump

- 2.8 ft3 TempMat

- 6.7 ft3 Latent Fiber (105 lbs latent debris)

• High Particulate Load

• 190 ft2 Unqualified Tape, Placards, Stickers

• Add 30% for Chemical Effects

• Marinite Insulation is not a problem

Analysis Results

• ~900 ft3 RMI (Mirror Insulation) Debris

• ~600 ft3 Transports to the Sump

• Recirculation Sump could completely fill with RMI Debris

• Effectively alters flow patterns in the sump reducing effectiveness of strainer surface area

• ~500 ft3 must be stopped before the sump

CFD Model Break At S/G Cross-over nozzle in Charlie Loop Red Areas will transport Mirror Insulation Foils

Ongoing Analysis Work

• Cumulative Effects Programs

• Placement of RMI Debris Interceptors

• HHSI Throttle Valves

- Analysis to determine current position

- Evaluation of Replacement

• Sump Level for break inside the Primary Shield

Refuel 16 Modifications

• Complete Recirculation Sump Strainer Replacement

- 2000 ft2 per train (or more)

- RHR and Spray Pump Strainers Cross-tie

• RMI Debris Interceptors

• Trash Racks

• Replace Pressurizer Cubicle Door

• Block Southern Stairwell of 436 ft

• Remove Toe-Kick Plate on 436 ft

AECL Strainer Designs

RMI Debris Interceptor Water Level 2 ft Perforate Plate or Heavy Screen FLOW 2 ft FLOOR

Preliminary Sketch For Interceptors

Outstanding Issues

• HHSI Throttle Valves

• Carbon/Graphite Pump Seals

Summary

• All Modifications, Analyses and Programmatic Changes must be in place before December 31, 2007

• GL 2004-02 response makes NRC commitments to address the issues

• Major Modification planned for RF16

• On going analysis of HHSI throttle valves potentially will result in RF16 modification and SI rebalance

Questions?