ML042930203

Meeting Handouts, Summary of Meeting with Duke Energy Corporation Potential Flooding in the Auxiliary Building

ML042930203
Person / Time
Site:	Oconee
Issue date:	10/25/2004
From:	Duke Energy Corp
To:	Office of Nuclear Reactor Regulation
Olshan L N, NRR/DLPM, 415-1419
Shared Package
ML042920388	List: ML042920363 ML042930203
References
TAC MC4295, TAC MC4296, TAC MC4297
Download: ML042930203 (31)

Text

W Duke VEinergySM Auxiliary Building Flood Plan Oconee Nuclear Station October 5, 2004 1

Duke a.

1. Energy Auxiliary Building Flood n Introduction FYI Background n Auxiliary Building Flood Plan 71 Analysis 7 Proposed Schedule n Conclusion 2

. Duke Auxiliary Building Flood I EnergySM Introduction n Duke Participants mJeff Robertson- Aux Bldg Flood Project Manager mn John Richards- Seismic Lead n Tim Brown- Pipe Stress Lead mReene' Gambrell- Reg Compliance Lead n George McAninch- Manager of the Design Basis Group 3

kDuke Auxiliary Building Flood no EnergySM Introduction CObjectives nOutline the ONS Auxiliary Building Flood plan LI Receive feedback and concurrence from NRR 4

Enkegy D Auxiliary Building Flood

Background

Original Licensing Basis ml, mAll flood sources either isolated or restricted in the event of a single pipe break n The break is isolated before safe shutdown or accident mitigating equipment is flooded 5

ker, Auxiliary Building Flood

Background

nl Existing Condition Ci Some postulated sources are not restricted or isolated m Low Pressure Service Water (LPSW) mHigh Pressure Service Water (HPSW) mPlant Drinking Water (PDW) 6

Duke V Energys Auxiliary Building Flood Plan m Overview m With the exception of 4 sprinkler systems, perform modifications to return to the original licensing basis m To preserve full automatic actuation capability, perform a realistic analysis to validate sprinkler systems are not susceptible to failure

LDuke Auxiliary Building Flood VEnergySM Plan Old Plan New Plan Perform mods to limit LPSW Aggressively implement mods and PDW flow, upgrade fire previously identified stations outside cable rooms, remove control room pipe Exempt postulated HPSW Perform modifications to sources and LPSW sources in isolate or limit flow from HPSW the LPI pump room from and LPSW sources except for original licensing basis using the sprinkler headers. Validate risk informed approach that sprinkler headers will not fail using realistic analysis.

8

. Duke Auxiliary Building Flood nV EnergySM Plan Existing Condition Corrective Action LPS f.W to roo coolers Flow Im i vmalve s boein g unre 7Y Oaad addiel PDW to AuxxBN FloIw Im,1ttg vaI'ves bei.......nrqg, unrestricted added Lp Pw an;d W.C Line.-s are bei-ng, removyed fMnes in controll room_

Non-gselismicICbose

h. station Being ugmadeedfseismic to

outsid~e cable rooms-

.r . __.

9

Duke Auxiliary Building Flood Plan MLEnergy Existing Condition Corrective Action Drains to LPI rooms not Flow restriction and/or restZrio isoolon being abddeda HPSW to Hot Shop routed To be isolated over LPI pump rooms LPSW to air coolers in Unit To be cut and capped 1&2 LPI pump rooms not isolated/restricted 4 inch HPSW supply to aux Will be isolated once 16 bldg fire hose stations inch mod is completed unisolated 10

. Duke Auxiliary Building Flood VEnergySM Plan Existing Condition Corrective Action 16 inch HPSW supply to Isolated all but 16 inch aux bldg fire hose stations elbow unisolated Will add 16 inch isolation valve outside Aux Bldg with flow limited bypass Unit 1-3 and drumming Exempt based on realistic station sprinkler systems seismic analysis 11

LDuke Auxiliary Building Flood VEnergy.

Plan HPSW Header to Hot Machine Shop Unisolated 12

wDuke Auxiliary Building Flood VEnergy.

Plan Supply and return piping to LPI and BS pump LPSW to Air Coolers in LPI Pump Room not Restricted/isolated 13 CDZ-

LDuke Auxiliary Building Flood UEnergy.

Plan Supply and return to LPI and BS pump room coolers to be cut and capped on other side of wall LPSW to Air Coolers in LPI Pump Room not Restricted/isolated 14 Co3

WPES HATCH 1AUCAML MP PA, PMUAR 1A A SIACOS S Oa I in

• HPSW U PERSHPATCH PUMPS 16'1 W3CALE W WI I LID RC?

LOPMU HATCH

~CH 1?F PAT afsV14 SWY Oz I I640 'CV Mod. Add 16 inch isolation fS*a valve with flow limited bypas&

Currently closed. To be re-opened as x _-

part of mod I c9)

Cw U3EER I a_-

0)

-U Figure i co YARD CONNECTION Co 18' EWST 0

0~

cn

Duke Auxiliary Building Flood Plan 4 Inch HPSW Supply to Aux Bldg Fire Hose Stations Unisolated 16

Duke Auxiliary Building Flood Plan 16 Inch Elbow in Aux Bldg Unisolated 17

LDuke VEnergy. Auxiliary Building Flood Plan Elbow is only unisolated 16 inch source, pipe enters from north west side of Turb bldg MFA..2.. I C0. T. in' ,. f ff f~-

16 Inch Elbow in Aux Bldg Unisolated 18 Coc,

sDuke Auxiliary Building Flood VEnergy.

Plan 16 Inch Elbow in Aux Bldg Unisolated 19 (o7

Duke Auxiliary Building Flood Plan Perform Realistic Analysis of Sprinklers 20 CO%

Auxiliary Building Flood Vf Energy.

_Duke Plan Hatch sprinkler header, on aux bldg side of aux bldg wall Perform Realistic Analysis of Sprinklers 21 cog

LDuke Auxiliary Building Flood VSEnergy.

Pan Perform Realistic Analysis of Sprinklers 22 C10

• Duke Auxiliary Building Flood I Energy.

Plan prinklers Perform Realistic Analysis of Sprinklers 23

aDuke I Energy.

Auxiliary Building Flood Plan Perform Realistic Analysis of Sprinklers 24 C'-?_

LDuke Auxiliary Building Flood VEnergy.

Plan Perform Realistic Analysis of Sprinklers 25 C13

Duke Auxiliary Building Flood M EnergyA, Analysis L. Scope m Sprinkler piping located units 1-3 RB personnel hatch areas FT Sprinkler piping located in the Unit 1 drumming area mT Piping contains butt welded and threaded piping components constructed of ASTM A-53 material 26

VEnergyw Auxiliary Building Flood Analysis m Surveillance a1 Perform walk downs of piping to identify:

r Bounding configuration based on comparison to experience data Potential for seismic interaction with other equipment (11/1 evaluation)

Potential for differential movements between uncoupled structures 27

V Energy Auxiliary Building Flood Analysis M Analysis ri Perform seismic analysis to confirm pipe integrity for bounding configurations

r. Utilize non-linear analytical techniques 7r Incorporate increased damping as appropriate n3 Incorporate differential building movements as appropriate Utilize Oconee's design basis safe shutdown earthquake spectrum rn Consistent with BWROG approach 28

Enery AB Sprinkler Piping Analysis n7 Evaluation mUtilize increased stress allowables mVerify that piping does not adversely interact with adjacent equipment nVerify that terminal end nozzle loads are acceptable CVerify that required piping supports remain functional 29

Duke V Energy..

Auxiliary Building Flood Proposed Schedule a.Complete analysis 2 nd Qtr 2005 inDevelop and transmit LAR 2 nd Qtr 2005 r Request SER from NRC 2nd Qtr 2006 30

Duke Auxiliary Building Flood V EnergyA, Conclusion mModify plant to return to original licensing basis with exception of sprinkler systems mUse realistic analysis to address sprinkler systems

, Preserves full automatic actuation capability j n Eliminates reliance on risk informed approach n Uses previously approved method 31