ML061590258

Slides for Meeting Salem Service Water Simplification Project

ML061590258
Person / Time
Site:	Salem, Hope Creek
Issue date:	06/01/2006
From:	Public Service Enterprise Group
To:	Office of Nuclear Reactor Regulation
References
Download: ML061590258 (11)

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Outin Meeting Objective Problem Statement Project Overview Objective

" Anticipated Benefits

" Technical Basis for Pursuing Project

" Scope

" Licensing Issues NRC Feedback on Project 831811 GE~NERATING S TATIN

MeeingObective Preview Salem Service Water Simplification Project Obtain NRC feedback Information necessary to support LCR LCR review schedule

• NG STATIONS

SW system design is complex

" Different flow rates for normal and LOCA conditions

" Multiple active components change state on accident signal

" Surveillance and maintenance requirements impact system availability Repeated LCO entries

" Unplanned LCOs (23 since 1/1/05)

" Frequent entries for de-silting Sa8J35 GENERATING STATIONS

Objectives Improve safety and reliability by simplifying design L Reduce number of components with active safety functions Reduce unplanned LCOs Approach

• Adopt lower required CFCU flow rate for LOCA conditions

• Containment re-analysis

• Implement fixed-resistance flow scheme

• Restriction orifices (passive) inlieu of modulating flow controls Li Eliminate accumulator tanks

• Transient hydraulic analyses and pipe support modifications S3IaI11kN EATIHG STATIONS

ExsigSyse Design I of2CFCU SW65\-

Containment 15.0C Ga- SW58 SW72 \-D Service Water Accumulator Tank ISW w57 SW646 SW223 SW63M3 Circulating

--- Water SW76 System To CrowAled HX 11SW122 CFCU (12SW376)

(12SWM)

Figure Depicts One SW2 12SW2 SW22 SW51 SW532 of TWo SW Header SW Pumpq Per Unit lher Cccolers Ký 11SW20 EDG ESW23 I

1SW28 Coolers I

Other Header turine Sa!eI#~A!~AATNGSTATIOAIS Building

Anticipated Benefits Improved safety Improved industrial safety

" Fewer safety-related valves Reduced activities in with active safety functions containment at power

• Reduced number of potential

• Heat stress failure modes Improved reliability and

• Improvement in LRF availability

" Reduced unplanned LCOs " Simplified system

• Main flow path and flow " Reduced surveillances control: 16 LCOs since 1/1/05 e Reduction in number of valves

• Tanks: 7 LCOs since 1/1/05 requiring surveillance testing

• Elimination of tanks Recovery of system margin wffi8Dý'GAEAIAGSAIN

Containment Re-analysis (WCAP 16503)

Available margin allows CFCU heat removal rate to be reduced Fixed-Resistance Flow Control (S.C.SW.MEE-1928)

Li Fixed-resistance flow scheme using orifices is feasible L Single flow rate of ~1500 gpm Elimination of CFCU Accumulator Tanks (MPR.2878)

NRC/Industry guidance for analytical approaches for GL 96-06 successfully applied at other sites Fixed-resistance scheme reduces severity of waterhammer for limiting case SaI8IJ GENdERATIIG STATIONS

Project Scope: Modifications Valve modifications (5 each per lo12perCF(U L.aW Nead unit)

" Eliminate SW57 valves Containment

" Eliminate SW65 valves Change SW223 valves to ==ui=.

Abandon Ir open/shut with limit stop Orifices

• 4 orifices per CFCU loop

• Bypass lines to allow high Cirulating I-"-,- Water SW76 system flow flush of CFCUs TO Cwutsied Tank elimination (2 per unit) CFCU

• Cut and cap injection line Figure Depicts One of Two SW Headem Abandon tanks in place Sw NMp PerUnit EDG SW23 Coolers 1SW26 Otiw Header Turbine

.. qq~mS>)~nnp~~ekBuilding

License Change needed to:

mReduce CFCU accident flow rate

• Changes Tech Spec limit mEliminate accumulator tanks e Eliminates Tech Spec criteria

• Alters commitment that SW System remains water solid Sa81*~RTNG STATOONS

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