ML061590258
| 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) in lieu of modulating flow controls Li Eliminate accumulator tanks
- Transient hydraulic analyses and pipe support modifications S3IaI11kN EATIHG STATIONS
ExsigSyse Design I of2CFCU SW65\\-
SW58 SW72 \\-D Containment 15.0C Ga-Service Water Accumulator Tank SW63M3 I
SW w57 SW646 SW223 Circulating
--- Water SW76 System HX 11SW122 (12SW376)
(12SWM)
SW2 12SW2 SW22 SW Pumpq Ccc Ký 11SW20 EDG I
Coolers 1SW28 turine Building To CrowAled CFCU Figure Depicts One of TWo SW Header Per Unit SW51 SW532 lher olers ESW23 I
Other Header Sa!eI#~A!~AATNGSTATIOAIS
Anticipated Benefits Improved safety
" Fewer safety-related valves with active safety functions
- Reduced number of potential failure modes
- Improvement in LRF
" Reduced unplanned LCOs
- Main flow path and flow control: 16 LCOs since 1/1/05
- Tanks: 7 LCOs since 1/1/05 Recovery of system margin Improved industrial safety Reduced activities in containment at power
- Heat stress Improved reliability and availability
" Simplified system
" Reduced surveillances e Reduction in number of valves requiring surveillance testing
- Elimination of tanks 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 unit) lo12 CF(U L.aW per Nead
" Eliminate SW57 valves
" 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 flow flush of CFCUs Tank elimination (2 per unit)
- Cut and cap injection line Abandon tanks in place Sw N Containment Cirulating I-"-,- Water SW76 system TO Cwutsied CFCU Figure Depicts One of Two SW Headem Per Unit Mp EDG Coolers SW23 1SW26 Otiw Header Turbine
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License Change needed to:
m Reduce CFCU accident flow rate
- Changes Tech Spec limit m Eliminate accumulator tanks e Eliminates Tech Spec criteria
- Alters commitment that SW System remains water solid Sa81*~RTNG STATOONS
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