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)

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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 LOCAIIID

• RHR flow into broken loop reduced from 11,500 gpm to 11,000 gpm NPSHA calculation uses 11,500 gpm NPSHR 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 LOCAUID Case Pump Maximum Required COP (psi)

Minimum Containment Margin (psi)

Duration COP Needed (minutes)

LOCAST CS 2

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RHR-IL

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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]

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Wetwell Pressure RHR Pump Broken Loop Containment Pressure Required cs Pump Containment Pressure Required

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RHR Pump LPCI Loop Containment Pressure Required 20 18 ii

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[II]

COP Available and COP Required Short-Term LOCA (previous) 160

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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

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Revised NPSH/COP Appendix R

• NPSHR Changed from Time-Dependent to Fixed Value Based on 3% Head Loss Hydraulic Institute standard for NPSHR 8000 hour0.0926 days <br />2.222 hours <br />0.0132 weeks <br />0.00304 months <br /> time-dependent NPSHr is conservative for limited duration Appendix R event (25.2 feet at peak SP temperature)

Revised calculation uses a fixed NPSHR (17 feet), which is equivalent to 3% loss in TDH 3% curves based on certified tests from BFN and other plants for same model pumps Use is recommended in BWROG COP Topical Report NEDC-33347P J. D. Wolcott 8

Revised NPSH/COP Appendix R 1m 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]

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J. D. Wolcott 10

COP Available and COP Required Appendix R 1m (previous) 240,

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9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 Time (hours)

J. D. Wolcott 25 Ii

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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 blowers Transition from EOls to SSls J. D. Wolcott 12

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[II]

Review of TVA Realistic Fire Analysis

• ACRS Interest

• Status of Staff Review 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