ML13114A936

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Redacted Meeting Handouts from Closed April 22, 2013 Meeting with Omaha Public Power District to Discuss Means for Protecting Fort Calhoun Station, Unit 1, Against Flooding
ML13114A936
Person / Time
Site: Fort Calhoun 
Issue date: 04/22/2013
From:
Omaha Public Power District
To:
Plant Licensing Branch IV
Sebrosky J
References
Download: ML13114A936 (44)
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Agenda

  • Purpose & Introductions-Steve Queen
  • FCS Flood Licensing Basis
  • ((Withheld Under 10 CFR 2.390))
  • New Strategy for BDB Flooding
  • Future Enhancements for BDB Flooding
  • Dry Fuel Storage
  • Summary

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New Strategy

  • Strategy Description
  • Equipment and Location Details
  • Validation and Verification
  • Supporting Analysis
  • Schedule Omaha Public Power Distr;ct

Strategy Description

- Feed depressurized SGs with River Water

- Steam SGs through blocked open MSSVs

- Use N2 in pressurizer and SITs for pressure control

- Makeup to Res as needed to maintain pressure

- Makeup to SFP for boil off

((Withheld Under 10 CFR 2.390))

Omaha Public Power-Oislricl

Strategy Description

  • Establish Initial Conditions and Install Equipment

((Withheld Under 10 CFR 2.390))

- Go to Cold Shutdown

- Establish RCS Pressure Control: 150 psi nitrogen bubble in pressurizer and SITs

- Install portable equipment (see sketch)

- Block open 2 MSSVs per Steam Generator (SG)

((Withheld Under 1 0 CFR 2.390))

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Strategy Description

- Establish 50 gpm aux feedwater flow to each SG

- Throttle Shutdown Cooling until SGs begin steaming

- Equilibrium Conditions:

  • Res: <250 F, natural circulation, tV150psi, subcooled
  • Pressurizer and SITs about 2/3s full

((Withheld Under 1 0 CFR 2.390))

Strategy Description

  • Long-Term Cooling With Flood> 1014'

- Maintain 50 gpm per SG using portable pumps

- Steam through blocked open MSSVs (~25 gpm/SG)

  • Drain excess water (~25gpm/SG) from steam lines

- Periodic Res makeup to maintain pressure >50psig

- SFP makeup to maintain level <<18 gpm)

((Withheld Under 1 0 CFR 2.390))

Strategy Description

  • Long-Term Cooling After Flood Recedes

- Maintain < 50 gpm/SG using portable pumps

- Steam through blocked open MSSVs

- Periodic Res makeup to maintain pressure >50psig

- SFP makeup to maintain level <<18 gpm)

- Replenish SIRWT (fire trucks or other pumps)

  • SIRWT inventory provides time

((Withheld Under 1 0 CFR 2.390))

Omaha Public Power Oislricl

SECURITY*RELATED INFORMATION V\\lITHOLD UNDER 10 CFR 2.390 Strategy Flow Path 1- - - - - -

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Equipment Photos Submersible Pump Flyght 852660 Shown: 35" Tall 150 gpm, 180' discharge head, 15 hp Model numb"r:

2660.180 Motor ratong' 15HPU3495RPM Volt.ge (3,,)*

208V 2JOV 460V 57$V Full load dmps:

39,r 3sA 18A 14A Ver sions 3" High he.'td Imp. Code 25 3 (HTI. 278 (SH) 4" & 6" StandMd Imp Code 228. 236 Hose co n l1~ll ()n Male NPT Pump d jrTl'@ n ~ l o n s: 14" W (m... x,) x 32" (35" SH ) H (m.<\\x.)

Max. weight (Ibs.): 172 (2 11 SH)

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Description:==

Aluminum and slainle ss slel:'l COllstructlon; ext** wear re~i stant d osed impeller,_ r e~ts or l bonom !.tr"u,lor.

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Warm liquid 70~C version ~wallablc.

2660.081 MSHA approved version.

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FLOWGPM Omaha Public Power District

Equipment Photos Pump 2 Goulds 3656/3756 S-Group 100 gpm, 56' discharge head Pump 3 DP-Pumps DPV(C/S)F 2/14 7 gpm, 460' discharge head, 3 hp Shown: 34" Ta II Weight: 93 Ib

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Equipment Photos Standby Output 1S0oC Rise kVAlkW Single phase @ 240V...................... 27/27 3 phase @ 208V.......................... 46/37 3 phase @ 240V.......................... 46/38 3 phase @ 480V.......................... 48/38 Prime Output 12SoC Rise kVAlkW Single phase @ 240V...................... 25/25 3 phase @ 208V.......................... 44/35 3 phase @ 240V.......................... 44/35 3 phase @ 480V.......................... 44/35 Amperage (Standby Rating)

Amps Single phase amperage @ 240/120V..... 11212X112 '

3 phase amperage @ 208V................... 128 3 phase amperage @ 240V................... 114 3 phase amperage @ 480V.................... 57 Voltage-3 phase adjustable 208/220/240/416/440/460/480 Voltage-Single phase adjustable 120/127/139/240/254/277 3 phase Power Factor....................... 0.8 Voltage Regulation....................... 1/2%

Frequency............................ 60 Hertz Total Harmonic Distortion.................. < 5%

Insulation............................. Class H M:!rlp. in I J~A Omaha Public Power Ois/rief

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Validation and Verification

  • Strategy Validation and Verification

- Functional testing

- Procedure V&V

- Operator timing evaluation

- Training

  • V&V scheduled prior to startup Omaha Public Power Oistricl

Supporting Analysis

  • Evaluations and Calculations Planned RCS Heat Removal/Thermo-hydraulic Analysis RCS Inventory and Pressure Response

- Boron Dilution Evaluation

- Fluid Flow/Hydraulic Evaluation

- Diesel Sizing and Fuel Consumption

((Withheld Under 10 CFR 2.390))

- Redundancy

- Steam Generator Fouling Evaluation

Supporting Analysis

  • Res Heat Removal/Thermo-Hydraulic Analysis

-Steam Flow Requirement

  • RCS: 50 gpm @ 2 days, <16 gpm @ 30 days
  • SFP: < 18 gpm

-Adequate Natural Circulation

  • Steam pressure remains <5 psig
  • lave remains < 260 F
  • RCS pressure remains < 150 psig
  • Assumes lower 70% of tube bundle fully fouled Omaha Public Power Oistrict

Supporting Analysis

  • Res Inventory and Pressure Response

- N2 in pressurizer and SITs controls pressure

  • Initially filled to 2/3 full and pressurized to 150psig

- Makeup to Res when pressure drops to 50 psig

  • Adds required less than once per week (using Pump 3)
  • Pressurizer and SIT level always remains > 25% full
  • Assumes 1 gpm leakage and 50 degrees of cooldown

Supporting Analysis

  • Boron Dilution/Reactivity Control

-Borated makeup source not required for >30 days (assumes 19pm leak)

  • Pre-borate RCS to 5000 ppm B
  • RCS >1000 ppm @ 30 days
  • If makeup exceeds 1 EFWST volume, borated water will be utilized.

Supporting Analysis

  • Hydraulic Analysis

. - > 30% flow & head margin.

  • Diesel Sizing and Fuel Consumption

- > 50% margin (one 35 kw diesel)

  • Assumes all pumps operating at full capacity

- > 30 days of fuel oil (Two 1000 gallon bladders)

  • Assumes diesel operating at full load

((Withheld Under 10 CFR 2.390))

Supporting Analysis

  • Redundancy

- Steam Generator & SFP Makeup

  • Redundant Pump 1 installed in SIRWT
  • EFWST and Pump 2 provide delay time if Pump 1 fails

- ReS Makeup (only required periodically)

  • Spare Pump 3.
  • Pump 1 and 2 in series provide makeup if Pump 3 fails.

- Power

  • Spare Diesel and Excess Fuel Omaha Public Power DiS/riet

Schedule for New Strategy Pre Startup:

  • Equipment Purchased, Tested, and Staged
  • Procedures V&Vd
  • Training Post Startup:
  • PMs and Periodic Surveillances
  • Improved Strategy for Res Not Intact

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Potential Enhancements to BDB Flood Strategies

  • Supply make-up water from seismically robust wells and pumps

- Power to pumps supplied by permanently installed cables

- Permanent piping to Room 81

  • Develop methods of monitoring key plant instrumentation
  • Develop strategy when Res is not intact prior to next refueling Omaha Public Power District

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Dry Fuel Storage

  • Adequate Cooling During BDB Floods

- Cooling is adequate when submerged

- When river recedes, vents must be unblocked within 40 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br /> (reanalysis to increase this time).

- Existing procedures clear vents

  • Adequate Structural Design for Flood Events:

- Designed for SO ft of head and 15 fps

((Withheld Under 10 CFR 2.390))

  • ..H Omaha Public Power District

Summary

  • FCS is licensed for floods to 1014' elevation

((Withheld Under 1 0 CFR 2.390))

  • Core and SFP cooling is provided for floods that rea c h [~ ~cld Under 10 CFR 239011 eIe vat ion i
  • Enhancements are planned before startup
  • Additional improvements planned after startup
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