ML090710768

Presentation Slides: February 26, 2009 Meeting with the Tennessee Valley Authority (TVA) to Discuss Proposed Extended Power Uprate (EPU) Analyses Revision

ML090710768
Person / Time
Site:	Browns Ferry
Issue date:	02/26/2009
From:	Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation
Orf, Tracy J.; NRR/DORL 415-2788
Shared Package
ML090710755	List: ML090710705 ML090710768 ML090710807
References
TAC MD5262, TAC MD5263
Download: ML090710768 (14)

Text

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[lID Agenda

• Results of Revised NPSH/COP Calculation

• ACRS COP Questions

• Follow-up Questions from Site Visit

• Review of TVA Realistic Fire Analysis

• NRC Request for Gothic Case Inputs James Emens 2 Revised NPSH/COP SHORT TERM RHR flow into broken loop reduced from 11 ,500 gpm to 11 ,000 gpm NPSH A calculation uses 11,500 gpm NPSH R calculation uses actual flow -11,000 gpm Lower flow reduces NPSH R from 28.4 feet to 25.6 feet @ 10 minutes Initial drywell humidity changed from 100% to 50% Parametric analysis varying the drywell air relative humidity from 00/0 to 100% was performed Concluded that the drywell humidity cannot exceed 50% without producing condensation in excess of TS allowable unidentified leakage of 5 gpm Change increases amount of noncondensible gases in containment post-LOCA J. D. Wolcott 3

• . Revised NPSH/COP SHORT TERM LOCA [II]

• NPSH R for RHR pump Changed from Single Value to Time Dependant Value Provided by Sulzer Report -Intact loop @ 10,000 gpm o 25.5 feet o 25.7 feet ----724.3 feet over 10 minute duration -Broken Loop @ 11 ,000 gpm o 28.4 feet o 27 feet ----7 25.6 feet over 10 minute duration J.D. Wolcott 4 Revised NPSH/COP SHORT TERM Case Pump Maximum Required COP (psi) Minimum Containment Margin (psi) Duration COP Needed (minutes)

LOCAST CS 2 .4 9 RHR-IL .8 1.6 5 RHR BL 3.3 -0.9 10 Revised Short-Term LOCA Calculation Results LOCAST CS 2 1.3 8.9 RHR-IL .2 2.6 3.2 RHR BL 2.1 0.7 9.3 J. D. Wolcott 5 COP Available and COP Required Short-Term LOCA (revised)

[II] 160* ( i 22 ;r Atmospheric Pressure 120 --+ 14 110 12 100 , <<I 600 10 150 140 !£ ... :l is... 130 E l- Wetwell Pressure RHR Pump Broken Loop Containment Pressure Required ---cs Pump Containment Pressure Required RHR Pump LPCI Loop Containment Pressure Required -' 20 18 ii 'iii .e: 16 ... :l III III ... D. o 100 200 400 500 J. D. Wolcott 6

• . [II]COP Available and COP Required Short-Term LOCA (previous) 160

• i i 22 150 20 [ "1V[ E CIl 120 140 130 RH R Pump Broken Loop Containment Pressure Required CS Pump Contalnmem Pressure Required RHR Pump LPCI Loop Containment Pressure Required 16 14 18 :i ell.e:  :::l ell ell CIl... a... 110 12 J.D.Wolcott 100 500 400 300 Time (seconds) 200 100 o 10 , <<I 600 7

[iI]Revised NPSH/COP Appendix R

• NPSH R Changed from Time-Dependent to Fixed Value Based on 3% Head -Hydraulic Institute standard for NPSH-8000 hour time-dependent NPSHr is conservative for limited duration Appendix R event (25.2 feet at peak SP temperature)

-Revised calculation uses a fixed NPSH R (17 feet), which equivalent to 3% loss in -3% curves based on certified tests from BFN and other plants for same model pumps -Use is recommended in BWROG COP Topical J. D. Wolcott 8 Revised NPSH/COP Appendix R Case Appendix R Pump RHR Max Required Containment Pressure (psia) 24 Minimum Containment Margin (psi) 1.6 Duration COP Needed (hours) 69 Revised Appendix R Calculation Results Appendix R RHR 20.5 4.1 27.8 J. D. Wolcott 9

" COP Available and COP Required Appendix R [II] (revised) 240 , , 40 220 +35 200 -I I ./ --..........

-.............

+ I 25 'iii E:: ell...

( ::::I III III III . 20 {!!.160 140 W ... 15 120 _+10 Atmospheric Pressure I -...........

100 I' I , 5 o 3 6 9 121518 212427 30333639 424548 515457 60 Time (hours) J. D. Wolcott 10 COP Available and COP Required Appendix R (previous) 240 i 40 35 220 30 200 rOJI til GJ 160 Ii.140 *tv:l" 15 Atmospheric Pressure 10 100" ,5 o3 6 9 12 15 18 21 24 27 30 33 36 394245 48 51 54 57 60 Time (hours) D. Wolcott Ii .8: GJ 5 til ...'(ij 11

-.. ACRS COP QUESTIONS/SITE VISIT FOLLOW-UP UID QUESTIONS Review of ACRS COP Questions

-Additional information needed by NRC Staff -Discussion with Sulzer Representative Follow-up Questions from BFN Site Visit -Manual actions for second RHR pump -Containment venting -Removal from service of drywell -Transition from EOls to J. D. Wolcott 12

'r , [II]Review of TVA Realistic Fire Analysis

• ACRS Interest

• Status of Staff J. E. Emens 13

-, " III]NRC Request for Gothic Case Inputs

• Containment data (OPL-4a) is available

• Decay Heat Assumptions are available

• Identify any additional NRC needs

• Means of submittal to NRC B. C. Morris 14