ML17187B046

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Summary of 970616 Meeting W/Util Re Status of ECCS Suction Strainer Replacement Project for Plants,In Response to NRC Bulletin 96-003, Potential Plugging of ECCS Suction.... Attendance List & Licensee Presentation Encl
ML17187B046
Person / Time
Site: Dresden, Quad Cities, LaSalle  
Issue date: 07/03/1997
From: Pulsifer R
NRC (Affiliation Not Assigned)
To:
NRC (Affiliation Not Assigned)
References
IEB-96-003, IEB-96-3, NUDOCS 9707090299
Download: ML17187B046 (49)
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Text

{{#Wiki_filter:* UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555--0001 July 3, 1997 LICENSEE: COMMONWEALTH EDISON COMPANY FACILITIES: Dresden Nuclear Power Station, Units 2 and 3 Quad Cities Nuclear Power Station, Units 1 and 2 LaSalle County Station, Units 1 and 2 ~6~ 50/13(

SUBJECT:

SUMMARY

OF MEETING CONCERNING THE QUAD CITIES, DRESDEN AND LASALLE ECCS SUCTION STRAINERS (NRC BULLETIN 96-03) On June 16, 1997, the NRC staff met with Commonwealth Edison Company (ComEd) to discuss the status of the Emergency Core Cooling System (ECCS) suction strainer replacement project for Dresden, Quad Cities, and LaSalle County Stations. This ComEd project is in response to NRC Bulletin (Bulletin) 96-03, "Potential Plugging of Emergency Core Cooling Suction Strainers by Debris in Boiling-Water Reactors." All Boiling.Water Reactors (BWR) licensees were requested to implement appropriate measures to ensure the capability of the ECCS to perform its safety function following a loss of coolant accident (LOCA). A list of attendees is provided as Attachment 1. The objective of the meeting was for ComEd to provide the status of the project at the Dresden, Quad Cities, and LaSalle facilities. Quad Cities, Unit 2, and Dresden, Unit 3, have had new ECCS strainers installed; however, they had requested, and received, a deferral in showing compliance to Bulletin 96-03 until December 1998 so that the staff and the industry can finalize the BWR Owners Group Utility Resolution Guidance (URG) report; upon which the design of the strainers is based. A copy of the licensee's presentation is included as Attachment 2. The licensee discussed their program for resolution of Bulletin 96-03 with a discussion on the methodology to establish the required strainer design and the present status and future schedule at the three stations. This project provides a common approach at each station by replacing the existing ECCS suction strainers with large passive strainers. The licensee stated that these new strainers accommodate the postulated post-LOCA debris and maintain the required ECCS net positive suction head and they also maintain the containment structural and mechanical design within the current licensing design basis. Based on the meeting, the licensee is scheduling to have the project completed at each facility by the end of the first refueling outage starting after January 1, 1997, in accordance with Bulletin 96-03, except for deferrals for Quad Cities, Unit 2, and Dresden, Unit 3, as mentioned above.* The licensee also stated that the method of drywell post-LOCA debris determination is based ' f ' 1111111111111111111111111111111111111111 l t"\\ l,8'435'9*t

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Commonwealth Edi son Company 6n the URG Method 3. ComEd will provide further information regarding strainer testihg, straine~ exclusion zone penetration, and upward forces on the installed strainer. Original signed by Robert M. Pulsifer, Project Manager Project Directorate 111-2 Division of Reactor Projects - Ill/IV Office of Nuclear Reactor R~gulation Docket Nos. 50-237, 50-249, 50-254, 50-265, 50-373, 50-374 Attachments:

1. list of Attendees
2., Licensee's Presentation cc w/encls: see next page Distribution. (w/ericl Docket File,T5C3.
  • R. Pulsifer ACRS, T2E26 WKropp, RI II E-M~il (w/encl 1):

R. Zimmerman, RPZ R.* Capra* D. Ross, SLM3 T. K. Kim, TJK3 R. Elliott, RBE 1 and 2): PUBLIC D. Skay .-r ~ PDUI-2 r/f J. Stang 'r OGC, 015818 M. Dapas, RI II.

s. Collins; *sJ~i/F,.>Mfraglia, FJM

,: J.. ~oe, JWR". :: * **" " *-,,**I., Adensam, EGA!*

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\\ ',.!r DOCUMENT NAME: ALPLANTS\\0616.SUM

  • To receive a copy of this doament, i
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y i he closures* *N* = NO'C y OFFICE PM: POI 11-2 -2 t:- e NAME RPULSIF DATE 07 /Z-{97

cc: Ms. I. Johnson Acting Manager, Nuclear Regulatory Services-Commonwealth Edison Company Executive Towers West III 1400 Opus Place, Suite 500 Downers Grove, Illinois 60515 Phillip P. Steptoe, Esquire Sidley and Austin One First National Plaza Chicago, Illinois 60603 Assistant Attorney General 100 West Randolph Street Suite 12 Chicago, Illinois 60601 U.S. Nuclear Regulatory Commi,ssion Resident Inspectors Office LaSalle Station 2605 N. 21st Road Marseilles, Illinois 61341-9756 Chairman LaSalle County Board of Supervisors LaSalle County Courthouse Ottawa, Illinois 61350 Attorney General 500 South Second Street Springfield, Illinois 62701 Chafrman Illinois Commerce Commission Leland Building 527 East Capitol Avenue Springfield, Illinois. 62706 Illinois Department of Nuclear Safety Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield, Illinois 62704 Regional Administrator U.S. NRC, Region III 801 Warrenville Road Lisle, Illinois 60532-4351 LaSalle County Station Unit Nos. I and 2 LaSalle Station Manager LaSalle County Station Rural Route I P.O. Box 220 Marseilles, Illinois 61341 Robert Cushing Chief, Public Utilities Division Illinois Attorney General's Office 100 West Randolph Street Chicago, Illinois 60601 Michael I. Miller, Esquire Sidley and Austin One First National Plaza Chicago, Illinois 60603 Document Control Desk-Licensing Commonwealth Edison Company 1400 Opus Place, Suite 400 Downers Grove, Illinois 60515

cc: Ms. I. Johnson Acting Manager, Nuclear Regulatory Services Conunonwealth Edison Company Executive Towers West III 1400 Opus Place, Suite 500 Downers Grove, Illinois 60515 Michael I. Miller, Esquire Sidley and Austin One First National Plaza Chicago, Illinois 60603 Site Vice President Dresden Nuclear Power Station 6500 North Dresden Road Morris, Illinois 60450-9765 Station Manager Dresden Nuclear Power Station £500 North Dresden Road Morris, Illinois 60450-9765 U.S. Nuclear Regulatory Conunission Resident Inspectors Office Dresden Station 6500 North Dresden Road Morris, Illinois 60450-9766 Richard J. Singer Manager -*Nuclear MidAmerican Energy Company 907 Walnut Street P.O. Box 657 Des Moines, Iowa 50303 Brent E. Gale, Esq. Vice President - Law and Regulatory Affairs. Mid American Energy Company One RiverCenter Place 106 East Second Street P.O. Box 4350 Davenport, Iowa 52808 Dresden Nuclear Power Station Unit Nos. 2 and 3 Quad Cities Nuclear Power Station Unit Nos. 1 and 2 Chairman Rock Island County Board of Supervisors 1504 3rd Avenue Rock Island County Office Bldg. Rock Island, Illinois 61201 Regional Administrator U.S. NRC, Region III 801 Warrenville Road Lisle, Illinois 60532-4351 Illinois Department of Nuclear Safety Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield, Illinois 62704 Chairman Grundy County Board Administration Building 1320 Union Street Morris, Illinois 60450 Mr. L. William Pearce Station Manager Quad Cities Nuclear Power Station 22710 206th Avenue North Cordova, Illinois 61242 U.S. Nuclear Regulatory Commission Quad Cities Resident Inspectors Office 22712 206th Avenue North Cordova, Illinois 61242 Document Control Desk-Licensing Coinmonwealth Edison Company 1400 Opus Place, Suite 400 Downers Grove, Illinois 60515

1 2 3

4.

5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 ATTACHMENT 1 REETING BETWEEN COMED AND NRC ECCS SUCTION STRAINER PROJECT - NRC BULLETIN 96-03 JUNE 16. 1997 NAME AFFILIATION TELEPHONE NUMBER Robert A. Capra NRC/DRPW/PDIII-2 (301) 415-1395 Richard Lobe 1 NRC/DSSA/SCSB (301) 415-2865 J. Kudrick NRC/DSSA/SCSB (301) 415-2871 Daniel L. Shamblin ComEd-NES (630) 663-6580 Jeffrey W. Drowley ComEd-NES/M&S (630) 663-7371 Henunat Safwat ComEd-NES (630) 663-7369 Steven P. Brown ComEd-LaSalle (815) 357-6761 ex 2506 . T.J. Kim NRR/DRPW/PDIII-1 (301) 415-1392 Donna Skay NRR/DRPW/PDIII-2. (301) 415-1322 Gilbert Zigler ITS Corp. (505) 254-1005 Greg Ashley Duke Engineering (630) 778-4218 John Eglaston ComEd-NES (630) 663-3753. Michael Marshall NRC/RES/GSIB (301) 415-5895 Rob Elliott NRC/NRR/SCSB (301) 415-1397 Al Serkiz NRC/RES/GSIB (301) 415-6563 Mike Neal NUS Information Svcs. Bob Rybak ComEd-Nuc. Lie. (630) 663-7286 Roger Heyn ComEd-Quad Cities (309) 654-2241 ex 3075 Harry Palas ComEd-NES (630) 663-7382 Vijay Datta ComEd-Dresden (815) 942-2920 ex 3368 Robert Pulsifer NRR/DRPW/PDIII-2 (301) 415-3016

ATTACHMENT 2

  • Ed Quad Cities, Dresden and* LaSalle County Stations ECCS Suction Strainer Replacement Project
  • Presentation to the Nuclear Regulatory Commission

. June 16, 1997 1

CS Suction Strainer lacement Project

    • Agenda/Meeting Objective/Background

- Bob Rybak, Senior BWR NLA. <* Overview + ECCS Suction Strainer Design Methodology Station Status Quad Cities Dresden ~ LaSalle County

    • Conclusion 2

nda

    • Agenda/Meeting Objective/Background - Bob Rybak
    • Overview - Dan Shamblin
    • ECCS Suction Strainer Design Methodology - Jeff Drowley
    • Station Status.

- Quad Cities - Roger Heyn - Dresden - Vijay Datta - LaSalle County-Steve Brown

    • Conclusion - Bob Rybak 3
    • --~-- -

. *-~---....

  • ctive of the Meeting
    • Review Program for Resolution of IEB 96-03

+:* Present the Common Three Station Approach

    • Discuss Methodology to Establish the Required Strainer Design
    • Present Preliminary Strainer Head Loss Results
    • Obtain Staff Feedback e

I Facilitate the Staff's Understanding of Our Program! 4

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  • !* Com.Ed Response to*IEB 96-03 Install new strainers at the earliest opportunity
  • !* Quad Cities and Dresden Strainers installed at Quad Cities U2 and Dresden U3
  • Meet original licensing basis Reduce fibrous insulation Requested Deferral to Show Compliance with IEB 96-03 for Quad Cities 2 and Dresden 3
  • Will meet IEB 96-03 requirements
  • !* LaSalle Install new strainers prior to Return-to-Service Will meet IEB 96-03 requirements
  • !* At This Time Com.Ed is Ready to Finalize the Methodology with the Staff 5

CS Suction Strainer lacement Project <* Agenda/Meeting Objective/Background

    • Overview

- Dan Shamblin, Nuclear Engineering Seroices, Projects Manager <* ECCS Suction Strainer Design Methodology

    • Station Status Quad Cities Dresden LaSalle County
    • Conclusion 6

r l f. ~.... -r ctive Implement a comprehensive program which. addresses the technical issues identified by NRC Bulletin 96-03 and allows the ComEd . Stations to fully comply with the Bulletin 7

Program Elements

    • Common Approach
    • Enhanced FME Program
    • Inspections/Continued Surveillance of the Drywell and Suppression Pool
    • Suppression Pool Cleaning
    • Reduction of Fibrous Insulation - Essentially RMI Plants
    • Review of NPSH Design Basis
    • Replacement of ECCS Suction Strainers With Large Passive Strainers 8

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i

~ * ** *** F.-.. -i r:****,*** r-lacement of ECCS Suction ainers

    • Install the Largest Passive ECCS Strainers Possible which Satisfy the Following Criteria:

- Accommodate the postulated Post-LOCA debris and maintain the required ECCS NPSH - Maintain the containment structural/ mechanical design within the licensed Des~gn Basis - Fit through existing suppression pool hatches e <* Utilize PCI Sure Flow' Stacked Disk Suction Strainer 9

tus of Actions to Address 96-03

    • FME Program

- All Stations . Spring 1995 - Enhanced Common Program Spring 1997

    • Inspections/Surveillance of Drywell and Suppression Pool
    • Suppression Pool Cleaning

- Quad Cities U1 (Spr '96) U2 (Spr '97) - Dresden U2 (Sum '96) U3 (Spr '97) - LaSalle U1 (Spr '96) U2 (Fall '96)

    • Reduction of Fibrous Insulation

- Quad Cities U1 (Spr '98) U2 Complete (April '97) - Dresden U2 (Spr '98) U3 Complete (May '97) 10

-~- ---*~-..

  • i

, tus of Actions to Address 96-03 (cont'd)

    • Review of NPSH Design Basis

- All Stations comply with current Design Basis - All Stations update Design Basis -Target Fall 1997

    • Replacement of ECCS Strainers I

- Quad Cities Ul (Spr '98) U2 Complete (March '97) - Dresden U2 (Spr '98) U3 Complete (April '97) ~ LaSalle Ul (Wntr '97) U2 (Spr '98) 11

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CS Suction Strainer lacement Project. <* Agenda/Meeting Objective/Background + Overview

    • ECCS Suction Strainer Design Methodology

- /ef!Drowley, Nuclear Engineering Seroices, System Design Technical Specialist e

    • Station Status Quad Cities Dresden LaSalle County
    • Conclusion 13

CS Suction Strainer Design proach

    • ComEd has Implemented a Common Approach to ECCS Suction Strainer Design for Quad Cities, Dresden and LaSalle

- Post-LOCA debris determination

  • - Behavior of debris in suppression pool

- Strainer performance - NPSH evaluation

    • Individual Station.and Staff members active on BWROG
    • ComEd Stations First to Install Large ECCS Suction Strainers 14

l CS Suction Strainer Design Determine Drywall & Wetwell Source Terms (URG} Determine Drywell Post-LOCA Debris I Zones-of-Influence (URG} + Drywall Debris Generation and Transport I (URG} Evaluate Debris Behavior In Suppression Pool (NUREGICR-6224) Determine Required Strainer Design Estimate ECCS Suction Strainer Head Loss (NUREG/CR-6224

  • Fiber IParllculate & URG
  • RMI}

I

1. ******************************

Evaluate ECCS NPSH + l................................................................................... Evaluate Structural/Mechanlcal Design ~.. **--**- 15

well and Wetwell Debris rce Terms

    • Review of Design Documentation
    • Review Supplemented by Walkdown as Necessary
    • Review Basis of URG Recommended Quantities to Assure Applicability to the Stations
    • Quad Cities and Dresden Measured Wetwell Sludge Quantities 16

thod of Drywell Post-LOCA ris Determination

    • URG Method 3

- Drywell models containing all significant debris sources (piping and equipment) - Breaks unrestrain~d/ double jet - Spherical Zones-of-Influence (ZOI) and destruction pressures per URG - Spheres systematically moved to Identify ZOis which control design - Potential breaks inside bio shield wall evaluated

  • Assume debris generated from 100% of insulation

- Breaks which could destroy drywell penetration insulation

  • being evaluated 17

well Debris Generation and unsport Factors1 Fibers Below Grating Fibers Above Grating Cal Sil RMI Quad Cities (M~rk I) 78 28 32.52 50 Dresden (Mark I) 78 28 32.52 so LaSalle (Mark II) (N/A) 28 (N/A) 252 Notes:

1) Factors applied as percentage of volume of insulation within a ZOI to determine debris destroyed and transported to the suppression pool.
2) Conservative with respect to URG 18

i I ris Behavior in Suppression l

    • Fibers

- Time dependent accumulation

  • Fully suspended throughout the event

- Uniform accumulation on strainers and in proportion to flow rate (RG 1.82)

    • Particulate Sludge/Dirt/Dust/Cal Sil

~ Assumed fully suspended throughout the event

  • .Utilized conservative 50% filtration efficiency for thin fiber beds 19

r:--.. ; ,._.~-1 ~ ris Behavior in Suppression l (cont'd)

    • Particulate (cont'd)

Paint/Rust Flakes

  • Conservative settling post turbulent phase.
  • Utilized conservative 100% filtration efficiency
    • RMI

- Assumed fully suspended throughout the event - Uniform.accumulation on strainers and in proportion to flow rate (RG 1.82) 20.

iner Head Loss Analysis

    • Plant Specific Design Basis to Conservatively Consider ECCS Flow and Pool Temperature Time Histories
    • Clean Strainer

- tested prototype strainer to measure component resistance - Evaluated difference in the tested and designed strainers

    • Debris Bed

- NUREG/CR-6224 correlation for fiber and particulate - BLOCKAGE Program to evaluate time dependence, particulate sedimentation, and filtration efficiency - URG correlation to estimate losses through RMI bed - Combined fiber/particulate and RMI losses 21

iner Head Loss Analysis nt'd) * *

    • Miscellaneous Debris (tags, rubber boots, etc.)

. - Addressed as reduction in effective strainer surface area

    • Total Strainer Head Loss is the Sum of the Clean Strainer Loss, the Maximum Time Dependent Fiber/Particulate Loss, and the.RMI Loss 22

I H Evaluation Quad Cities Dresden NPSH - Limiting Single x x Failure NPSH - Limiting Pool x x Temperature/Pressure

Response

Suppression Pool Tech Spec x x Minimum Level (w / drawdown) Tech Spec Suppression Pool x x Temperature to Maximize AP Increased Friction Losses to x x Account for Aging U nthrottled Flows for t<600 s x x Throttled Flows for t> 600 s x x r.-... **~ LaSalle x x x x x x x 23

ctural/Mechanical alification *

    • Consistent With Current Licensing Commihnents
    • Design Basis Calculations Updated (Piping, Supports, Penetrations)
    • Strainers Qualified for Design Basis Loads Including Submerged Structllre Hydrodynamic e

Loads 24

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--~ r*--**-~ I ~., ~* ~ ~ 1 .,_.. **i P *****1 "1 t-,.:***. :;_; ~~ ~ CS Suction Strainer lacement Project

    • Agenda/Meeting Objective/Background.

+ Overview

    • ECCS Suction Strainer Design Methodology
    • Station Status

- Quad Cities

  • Roger Heyn, Cognizant Design Engineer Dresden LaSalle County
    • Conclusion 25
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'.°'"* .J d Cities Station Strainer lementation Schedule Unit2 . (Actual) . Strainer Design 10/96 Modification Issued for Construction 12/96 Strainers Delivered 2/97 Strainers Installed 3/97 Unitl (Planned) 7/97 9/97 2/98 Spring/98

  • )

26

J QUAD CITIES REPLACEMENT STRAINER DESIGN _) Ii I \\-4-----.-*~ I I ORIGINAL ORG. 4.6 SO FT 45" I I I I I I I I I I I I I I I I I I I I I I I I REPLACEMENT STRAINER PROFILE REPLACEMENT 207 SQ FT STRAINER SURFACE AREA I I I I I I I I I I I I I I I I I l I I I I I ~I ~, I J .J ] I I ]

  • 1 I

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  • 1 tulated Post-LOCA Debris ad Cities Station Total Drywell Insulation Estimated in the Pool from Controlling ZOI Controlling Break Location Cal Sil (ft3)

Fiber (f\\3) Max Fiber Recirc Header El. 0.8 5 610 ft Max RMI Inside Bio Shield 0 Type Drywell Dirt/Dust/Spalled Concrete Other Transient Debris Fiber Tags, Rubber Boots, Etc. Rust flakes Paint and Other Surface Coatings

  • Other Fixed Debris Latent Debris (Unqualified Paint)

Wetwell Suppression Pool Sludge( dry) Total Non-Insulation Debris in the Pool Quantity 150 lbs 2 ft3 8 ft2 50 lbs 85 lbs 0 85 lbs 443 lbs (1 fuel cycle) 0 Source URG RMI (f\\2) 11,773 19,405 Station Unique Station Unique URG URG Station Unique Bounding Estimate Station Unique r 28

r** _.. _l ,-~*- *-1 ~ liminary Quad Cities Station ainer Head Loss Results 0.4 Total Head Loss 2.2 ft of H20 II Clean Strainer @ i 8350gpm CD RMI @ 8350 gpm Notes: 1) Negligible Fiber 1.8

2) Head Loss in ft of H20 29

d Cities Station Summary

    • Quad Cities ~eplacement ECCS Suction Strainers have been Designed Using Conservative Methods Source estimates (additional sources considered which are not in the as-built plant)

- Break locations, types and ZOI - Generation and transport - Instantaneous arrival of debris in the pool - Uniform accumulation of debris on the strainers - ECCS flows and pool temperatures

    • Reduction in Fibrous Insulation
    • Essentially No Fiber/Particulate Head Loss 30

CS Suction Strainer lacement Project

    • Agenda/Meeting Objective/Background

<* Overview

    • ECCS Suction Strainer Design Methodology
    • Station Status Quad Cities

- Dresden

  • Vijay Datta, Cognizant Design Engineer LaSalle County
    • Conclusion 31

sden Station Strainer lementation Schedule Strainer Design Modification Issued for Construction. Strainers Delivered Strainers Installed Unit3 (Actual) 12/96 2/97 3/97 4/97 Unit2 (Planned) 8/97 . 9/97 1/98 Spring/98

  • 0.,

32

DRESDEN REPLACEMENT STRAINER DESIGN I I I I I I I I I I I I I I ( I I I I II I I I I I I I I \\~~ I I ORIGINAL REPLACEMENT STRAINER PROFILE ORG. 4.6 SO FT REPLACEMENT 118 SO FT STRAINER SURFACE AREA

  • I I

t i I I I I I I I I =,.., <..:J I I I I I I I I I I I I _l '1 ! j 1 I I J 1 I I J .~

--***1 r-*

  • tulated Post-LOCA Debris esden Station Total Drywell Insulation Estimated in the Pool from Controlling ZOI Controlling Break Location Fiber (ft3)

RMI (ft2) Max Fiber Recirc Line El. 535 ft 16 14,025 Max RMI~ Inside Bio Shield Wall 9 19,405 Total Non-Insulation Debris Iii the Pool Type Quantity Source Drywell Dirt/Dust/Spalled Concrete 150 lbs URG Other Transient Debris Fiber 2 ft3 Station Unique Tags, Pads, Etc. 8 ft2 Station Unique Rust Flakes SO lbs URG Paint and Other Swface Coatings 85 lbs URG Other Fixed Debris 0 Station Unique Latent Debris (Unquilified Paint) 85 lbs Bounding Estimate Wetwell Suppression Pool Sludge( dry) 370 lbs (I fuel cycle) Station Unique 34

liminary Dresden Station ainer Head Loss Results 0.3 3.3 Total Head L?ss 2.2 ft of H20 1.6 mD Clean Strainer@ 8050 gpm

  • Fiber& Particulate@

7250gpm D RMI @ 8050 gpm Notes: 1) Values in ft of H20

2) Flow rate at worst case head loss 35

f I I .f t I

  • 1 den Station Summary
    • Dresden Replacement ECCS Suction Strainers have e

been Designed Using Conservative Methods Source estimates (additional sources considered which are not in the as-built plant) - Break locations, types and ZOI - Generation and transport - Instantaneous arrival of debris in the pool - Filtration and sedimentation - Uniform accumulation of debris on the strainers - Consideration of thin fiber bed head loss -* ECCS flows and pool temperatures - Head loss calculation (sum of individual components)

    • Reduction in Fibrous Insulation 36

CS Suction Strainer lacement Project

  • Agenda/Meeting Objective/Background

<* Overview

    • ECCS Suction Strainer Design Methodology
    • Station Status Quad Cities Dresden

- LaSalle County -* Steve Brown, Cognizant Design Engineer

    • Conclusion 37

-*-~ I ~ ~~ alle County Station Strainer lementation Schedule Unitl Unit2 (Underway) (Planned). Strainer Design 6/97 7/97 Modification Issued for Construction 8/97 9/97 Strainers Delivered 10/97 1/98 Strainers Installed Winter/97 Spring/98 38

~ N N LASALLE REPLACEMENT STRAINER DESIGN LJ 34" CURRENT STRAINER PROFILE REPLACEMENT 100.2 SQ FT CURRENT 16.7 SQ FT I r r I r I r r r r I. STRAINER SURFACE AREA . I I I .1 I I 1 I 1 I I I T I 1 I [ I I I I I I I I I I 34" REPLACEMENT I I I I I I I I I 1 I .J J l I J I .J 1 _J ~.. ~.. i

--~--, i.,,,, __ ~; i. tulated Post-LOCA Debris al le Station

  • Total Drywell Insulation in the Pool Estimated from Controlling ZOJ Controllfng Break Location Fiber (f P)

RMI (ft2) Max RMI (piping) D Main Steam Line 0.1 4,100 El. 745 ft Max RMI (other) Inside Bio Shield Wall 0 Type Drywell Dirt/Dust/Spalled Concrete Other Transient Debris Fiber Tags, Rubber Boots, Etc. Rust Flakes Paint and Other Swface Coatings

  • Other Fixed Debris Latent Debris (Unqualified Paint)

Wetwell Suppression Pool Sludge( dry) Total Non-Insulation Debris In the Pool _Quantity 150 lbs 1.7 ft3 8 ft2 SO lbs 85 lbs 0 85 lbs 600 lbs (2 fuel cycles) 3,000 Source URG Station Unique Station Unique URG URG Bounding Estimate Station Unique URG \\.*.... **.i r..-. *.~ 40

~~ r----i -* -- C- ***~-.... ~ r* n iminary LaSalle County ion Strainer Head Loss Results 1.1 0.7 Total Head Loss 1.8 ft of H20 II Clean Strainer @ 8100 gpm ml RMI@ 8100 gpm Notes: 1) Negligible Fiber 2} Head-Loss in ft of H20 41

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'!--~.,** -.- *"'.'II .-.i ~-* alle County Station mary

    • LaSalle County Station is Using Conservative Methods for Design of Replacement ECCS Suction Strainers

- Source estimates (additional sources considered which are not. in the as-built plant) - Break locations, types and ZOI (1

  • 1
  • I*

- Generation and transport e - Instantaneous arrival of debris in the pool - Head loss calculation (conservative interpretation of URG RMI data) - ECCS flows and pool temperature

    • Essentially No Fiber/Particulate Head Loss
  • 42

CS Suction Strainer lacement Project

    • Agenda/Meeting Objective/Background.

<* Overview

    • ECCS Suction Strainer Design Methodology
    • Station Status Quad Cities Dresden LaSalle County
    • Conclusion

- Bob Rybak, Senior BWR NLA 43

  • ~
  • **t, 'l clusion
    • Com.Ed is Implementing a Consistent Program to Address IEB 96-03 Concerns
    • ComEd is Taking Reasonable Steps to.
  • Ultimately Assure Compliance with IEB 96-03

., ~- 44 .}}

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