ML062760245

V. C. Summer Nuclear Station RF-16 Outage Information

ML062760245
Person / Time
Site:	Summer
Issue date:	09/27/2006
From:	Andrea Torres South Carolina Electric & Gas Co
To:	Office of Nuclear Reactor Regulation
References
Download: ML062760245 (27)

Text

V. C. Summer Nuclear Station RF-16 Outage Information Alan Torres Manager, Planning and Scheduling Enclosure

RF-16 Goals

• Outage goals

- Nuclear safety

• Protect the core and the public (conservative decisions)

• Use N+1 (Safety Function Bar Chart)

• Secondary side focus (use of secondary side outage manager)

• Readiness reviews using Equipment Risk

RF-16 Goals

- Radiological safety

• ALARA (use one train of RHR for shutdown)

• Dose control-use PRC resin

• Control Crud Burst (24hr RCP run after peroxide injection)

- Industrial safety

• Two minute drill

• Pre-job briefs

• Be smart- use OE (Book)

RF-16 Goals

• Duration: 37 Days

• Budget projected at 25.7 m

• Human Performance Events: < 1

• Recordable Injuries: < 1

• Significant Safety Events: 0

• Post 100% - 90 Day Capacity:

• Dose: 70 REM

RF-16 Major Modifications

• New Alternate AC supply to 1DX

- Reduction in CDF of 31.8%

• Reactor Building Sump Redesign

- Change out of SI Throttle valves

- Addition of debris catchers

• Replacement of RV head nuts with Hydranuts

- Significant Dose savings

• Replacement of B DG Governor

- Improved reliability

RF-16 RB Sump

RF-16 New Sump Design

RF-16 Hydra Nuts

RF-16 Items of Interest

• Reactor lower head visual inspection

• Upper head volumetric inspection

• B Hot leg volumetric inspection

• Containment tendon inspection

• LP A inspection and overhaul

• LP A condenser bellows replacement

RF-16 Expansion Bellows

RF-16 Reactor Head Volumetric Exam

RF-16 Items of Interest

• Replacement of air disconnect 8903 on main out going bus

• Replacement of DC feedback cards on EX2000 excitation system

Program Enhancements

RF-16 Program Improvements

• Program Changes

- Implementation of a new FME program

- Use of new maintenance procedure format

- Use of an integrated valve team for AOV/MOVS

RF-15 Carry over

• Operating Experience books

• Daily talking points

• Weekly outage newsletter

• Rewarded behaviors program utilizes human performance error reduction tools

• Outage observation blitz

RF-16

• Challenges

- RCS leakage identification plan

- Identification and resolution of fuel leaker

- Potential unknown on volumetric head inspection

- SI flow balance

- Alternate AC power retest

Questions?

V.C. Summer Station Recirculation Sump Design Changes Kirk Weir Design Engineering

Overview

• Analysis Results

• Ongoing Analysis Work

• Refuel 16 Activities

Analysis Results

• ~930ft2 strainer for each train

• 8.2 ft3 fiber load on the sump

- 1.5 ft3 tempmat

- 6.7 ft3 latent fiber (105 lbs latent debris)

• 190 ft2 unqualified tape, placards, stickers

• Chemical Effects account for <1%

total particulate

• High particulate load

• Marinite insulation is not a problem

Analysis Results

• 713.7 ft3 of RMI (mirror insulation) debris

• 27.3 ft3 transports to the sump

- based on RMI debris transport testing

- removed the need for debris interceptors

Analysis Results

• Evaluation of sump level for break inside the primary shield was completed and is acceptable

• Evaluation of sump level for break inside the pressurizer cubicle was completed and is acceptable. the pressurizer cubicle door latching mechanism is assumed to fail.

• HHSI throttle valves will be replaced due to downstream effects

- current valve opening is 1/32

- new valve opening is ~3/32

Ongoing Analysis Work

• Cumulative effects program -

calculations are being completed and procedure updates are prepared

• Evaluation of downstream effects

• Conducting large scale testing on strainers

RF-16 Modifications

• Complete recirculation sump strainer replacement

- 2400 ft2 per train

- RHR and spray pump strainers cross-tie

• Trash racks

• Block southern stairwell of 436 ft elevation

• Remove toe-kick plate on 436 ft elevation

• Installation of new HHSI throttle valves

AECL Strainer Designs

Review

• On track to meet the requirements of the Generic Letter

• Supplemental response to Generic Letter by 12/31/06

• Major modifications planned for RF16

Questions?