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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Agenda

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• 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 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 LOCAUID Maximum Minimum Duration Case Pump Required Containment COP Margin Needed COP (psi) (minutes)

(psi)

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 22 150 20 140 Wetwell Pressure 18

!£ RHR Pump Broken Loop Containment Pressure Required ii

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-' RHR Pump LPCI Loop Containment Pressure Required

r 120 Atmospheric Pressure

-- + 14 110 12 lL----.....,------~-----""T"""-----_=:_----::::_----_:' 600 10 100 , << I o 100 200 400 500 J. D. Wolcott 6

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

160

• i i 22 150 20 140 RH R Pump Broken Loop Containment Pressure Required 18

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~ CS Pump Contalnmem Pressure Required "1V 130 16 ~

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CIl RHR Pump LPCI Loop Containment Pressure Required CIl a...

I 120 14 110 12 11-----""""'!'------.....,-------~-----_:_:_:_-----_::_-----_;'1 100 , << I 60010 o 100 200 300 400 500 J.D.Wolcott Time (seconds) 7

Revised NPSH/COP Appendix R [iI]

• NPSH R Changed from Time-Dependent to Fixed Value Based on 3% Head Loss

- Hydraulic Institute standard for NPSH R

- 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 NPSH R (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 Max Required Minimum Duration Case Pump Containment Containment COP Margin Needed Pressure (psi) (hours)

(psia)

Appendix R RHR 24 1.6 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 -............. + 30 I~18°11 ( w_"'~'".

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140 W I -........... ... 15 Atmospheric Pressure 120 _+10 100 I' I , 5 o 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 Time (hours)

J. D. Wolcott 10

COP Available and COP Required Appendix R 1m (previous) 240 , i 40 220 35 200 30 rOJI f...~m, . .",~w_"

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140 *tv I :l" 15 Atmospheric Pressure 120 10 100 ' '" " , 5 o 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 Time (hours)

J. D. Wolcott 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 blowers

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

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Review of TVA Realistic Fire Analysis [II]

• ACRS Interest

• Status of Staff Review J. E. Emens 13

NRC Request for Gothic Case Inputs III]

• 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