ML052920066

9/19/05, Catawba, Units 1 and 2, Enclosure 2, Meeting Summary Handouts, Nuclear Service Water System

ML052920066
Person / Time
Site:	Catawba
Issue date:	09/19/2005
From:	Farideh Saba NRC/NRR/DLPM/LPD2
To:	Duke Energy Corp
Saba F
Shared Package
ML052910390	List: ML052910376 ML052920066
References
Download: ML052920066 (17)

Text

Catawba Nuclear Station Nuclear Service Water System Technical Specification Extension Request September 19, 2005 ATTACHMENT 2

P iDuke SOrPowere Participants Name Title Bill Pitesa Station Manager George Hamrick Manager- Mechanical & Civil Engineering Duncan Brewer Manager - Safety Assessment Terry Edwards Manager- Nuclear Service Water Project: Implementation Dayna Herrick Manager - PRA Lee Keller Manager - Regulatory Compliance Paul Farish PRA Engineer Randy Hart Licensing Engineer 2

ffiDuke Agenda EPower,

• Opening Remarks Bill Pitesa e Nuclear Service Water (NSW) System Bill Pitesa

- Overview

- Background

• NSWS Header Outage Activities Terry Edwards

• Risk Mitigation Bill Pitesa

• Probabilistic Risk Assessment Duncan Brewer

• Closing Remarks Bill Pitesa 3

Nuclear Service Water System - PkDuke C Powere Overview LEiW

.RC CONDENSER CIRCULATING WATER ORL NVEffNJIONAI 1LOCPRESSURE FRN MJCLEAR SERVICE VATER AND SIAND1Y NCLEAR SERVICE VATER OTR EXTERIOR FIRE PROTECTION SERVICE WATER M-' WIRtTH -

I. .

-Ii i 'p *I . I la i 1 ' "I 1i

• I; i .

I t. .

... : ...... : ,-,~l IjI t:e . _ , *1 I

. i ,,

SI I I

a I

• *E, }

I: . a

'iI I .

. I .

fCTBA LER T SITE PLAN CATAWBA NUCLEA\R STATION SERVICE WATER PROJECT

• i FC-

-ME p- .

.,I FIGURE 0-I 4

Nuclear Service Water System - PDuke wPowere

Background

NSWS degradation requires large-scale system upgrades

- Component Cooling Water heat exchangers retubed

- NSWS to Auxiliary Feedwater System piping sections replaced

- NSWS to control room chilled water system piping replaced

- Containment Spray heat exchangers replaced

- 2EOC14 first stage NSWS to Containment Spray piping replaced

- NSWS to Containment Spray and Component Cooling pipe replacements scheduled in outages from 2005 through 2009 5

Nuclear Service Water System- }PDuke OPower.P

Background

• In 2000, first major NSWS cleaning and inspection (License Amendment Request (LAR) for 12 day extended LCO)

• NSWS normal flow rate increase to minimize siltation and sedimentation

• NSWS chemical addition

• 2003 replaced 20 foot section of 42 inch buried piping for detailed piping condition analysis (LAR for 7 day extended LCO)

• Internal NSWS pipe condition inspections performed 1EOC1 4, 2EOC1 3, 1EOC1 5 6

fl>i

[4J RN 14 Day LCO I qw

~.PLriuti

.~g. :Cpett-~ Odcbet)w4~fI ¶MvNebw eCnVi/ I 'im:

WDeceff '1tr4 II q1I-tw , _rf4

- MMMMnj MY I a a ,e i iW ~;+/-2i ~~.!

I WmS I

All Woulk Ordder I I Prefab Work Is F I WJ nb

.COfesubrfgt!Wlfl rvi i I I I

I I  ; II I

I I a Ti a

7', I.

Mvd-Feb Secunity Fence I

I I

FN Rlelocation Ii~r~,M t P I I

I I".1 -.

'I II jl=, II -'-- z-CD5 I

WI', -;1 vvtn:41.t I II. ir'i!

I-------------

I Li z+/- ~~ ~N ve e~-. "- Dcebe . . . . * .I'$tf1.

.i .i~ .~ . ~JPJIV. . . . .i . .

t7

Nuclear Service Water System - PDuke apPowere 14 Day AOT Activities e NSWS Supply header clean and coat (LAR)

- High pressure water clean piping

- Perform condition assessment inspection

- Sandblast pipe internals

- Coat to Stabilize NSWS supply header welds

• NSWS system modification activities to facilitate future outage/innage work for Single Header Operation

- Install auxiliary building crossover piping and isolation valves

- Replace piping and install crossover isolation valves in NSWS pump house

- Install auxiliary building discharge header piping and isolation valves

- Install emergency diesel generator supply isolation piping and valves 8

Nuclear Service Water System - pwDuke 0Power.

14 Day AOT Activities NSWS Supply Header Clean/Coat Preparation

- Full scale piping mockup testing of all clean and coat processes and equipmen g N Prove processes R Establish production time frames u Test equipment

• Train personnel

- Detailed pipe inspection and evaluation process

- Include lessons learned from NSWS lake intake pipe October 2005 clean and coat

- Work scope reduction contingency plan in place for unforeseen events

- All material staged, back up equipment on site, additional resources on standby

- Detailed project controls process to monitor, evaluate, and report progress each shift Modification Preparation

- All material on site

- Use of metrology to maximize prefab assemblies

- All assemblies prefabbed prior to NSWS Train Outage start

- Dedicated work teams and management oversight for each modification work area 9

Nuclear Service Water System- -Power.

Risk Mitigation

• Minimize maintenance activities for equipment not undergoing maintenance

• Temporary Modifications to allow DGs on NSWS train out of service to be "available"

• CCW system to be in cross train alignment during NSWS train outages 9 Operations review of key abnormal procedures and appropriate training 10

Nuclear Service Water System - PMDuke Risk Mitigation

• Changes have been made to loss of power procedures to address local throttling of AFW flow

• Changes will be made to plant procedures for the ability to cross tie the CCW headers

• Operations use of Configuration Risk Management Program to control and limit activities at the station

• Outage Control Center will be manned during each NSWS train outage 11

Nuclear Service Water System - OrPowere Probabilistic Risk Assessment

• For the 14 day Completion Time

-ICDP--is 5.8E-6

• K A' ILERP is 1.9E-7

• If this were a request for a permanent change under RG 1.174, this would be in the range of a "Small Change" 12

Nuclear Service Water System - PoDuke temPower.

Probabilistic Risk Assessment

• Compensatory actions credited quantitatively in the PRA analysis:

- The following systems will be kept available and protected:

• Condenser Circulating Water System i AFW, ECCS, Component Cooling Water, 4160v AC, EDGs and SSF

- Back-up cooling water will be supplied to the EDG while NSWS is out of service 13

Nuclear Service Water System - PDhuke Probabilistic Risk Assessment

• Procedure Changes Credited Quantitatively in the PRA Analysis:

- For loss of battery chargers, operators will be dispatched to take control of turbine driven AFW pump prior to loss of DC power For loss of power to the operating train, the Component Cooling Water system will be realigned to provide cooling to the train of mitigation equipment with power.

14

Nuclear Service Water System - oDuke MSPower.

Probabilistic Risk Assessment

• Additional compensatory actions not credited by the PRA Analysis:

Operators will do just in time review of loss of power, loss of service water and loss of component cooling water procedures

- No maintenance will be allowed in the switchyard

- NSWS outage will be during the time of year with lower risk of severe weather

- Increased focus by all plant personnel (OPS, Maintenance, Engineering and Management) due to awareness of risk significance 15

Nuclear Service Water System - Duke

• Powers Probabilistic Risk Assessment e Additional actions considered but not taken because other compensatory actions accomplished the same risk reduction:

- Cross connect DC power

- Provide a portable power supply for the DC powered valves

- Provide a backup cooling water source for a motor driven AFW Pump 16

Eb Duke EwPower.

Nuclear Service Water System _

• Closing Remarks 17