ML051540101

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Meeting Presentation Slides on Station Black Out
ML051540101
Person / Time
Site: Palo Verde  Arizona Public Service icon.png
Issue date: 05/24/2005
From:
Arizona Public Service Co
To:
Office of Nuclear Reactor Regulation
References
Download: ML051540101 (27)
v • d • e


Text

Palo Verde

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Station Black Out Presentation To The Nuclear Regulatory Commission May 24, 2005

Palo Verde Agenda

  • Introductions Carl Churchman/

Mel Fields

  • Description of Proposed M. Karbassian Changes to Station Blackout Coping Strategy
  • Closing Remarks C. Churchman/

M. Fields

Palo Verde B ackground

- Increase Power by 2.94% for U1 & U3

- 3876 MWt to 3990 MWt

- Currently being reviewed by NRC Staff

  • June 14, 2004 Loss of Off-site Power

- Unit 1,2 & 3

- SBO Category P3 Plant with 16 hour1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> Coping Strategy

Palo Verde 41 Purpose

  • Identify Actions Necessary to Comply With 16 Hour Coping Strategy

Palo Verde What is PV's SBO Design Basis

- Alternate AC (AAC) Plant Per Reg Guide 1.155 &

NUMARC 87-00

  • Ltr 161-04146-WFC/MEP, dated August 31, 1991
  • SE Dated February 11, 1992 (section 2.2.2)

- Requirement for an AAC Plant

  • Demonstrate Coping W/O Power for 1 Hour
  • 4.2 MW GTG On Line within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />
  • Demonstrate Coping With GTG available for an additional 3 Hours (Now 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />)

Palo Verde Existing Strategy (4 hr Coping)

Existing Analysis

- Assumes 120 GPM RCS Leak Rate

- Uses ADVs for Heat Removal

- Start GTG Within 1 hr

- Load EW/SP/EC/HVAC/Battery Chargers

- Establish Charging for Inventory Control

- Maintain Hot Standby Using ADVs

- Remain @ Hot Standby for the Following 3 Hours

Palo Verde

( Cor (16 hr Coping Credited Future Strategy

  • Revised Analysis

- Assume 83 GPM RCS Leak Rate

- Minimize Operator Action During 1St hr

- Start GTG, Within 1 hr

- Load EW/SP/EC/HVAC/Battery Chargers

- Use ADV for Heat Removal

- Use HPSI for RCS Inventory Control

- Uses Pressurizer Vent for Pressure Control

- Cool Down to SDC Condition in 16 hrs

Palo Verde Evaluation of Design Basis RCS Inventory

  • 4 hr Coping

- Core Remains Covered

- Credits Reflux Boiling

  • 16 hr Coping

- Core Remains Covered

- Natural Circulation

  • Reviewed by NRC
  • February 11, 1992

Palo Verde Hot Leg Temperatures (OF) tL5s ja:-

am0 31 CI.,

I-I U 10 Wo.

Palo Verde Cold Leg Temperatures (OF) 550 ARCl 450 2t~

4cMJ.

2CU n DO Time (seconds,)

Palo Verde Pressurizer Pressure (PSIA)

-\\\\ I  /.,

Hawley 2500 2000 1500 1 000 SOD 0l Time (seconds)

Palo Verde Pressurizer Level (ft) 25 -

0 15 l

ID 5

15 0

1 OOD 20000 30000 4000D 50000 0i000 lime (seconds)

Palo Ve rde Leak Flow (per RCP)

(Ibmlsec) 2 -

-4 1.2j..

I

Palo1 Vrde Evaluation of Condensate Inventory

  • 4 hr Coping
  • 16 hr Coping
  • Required Condensate 156000 gallons

- Decay Heat Sensible Heat SG Inventory Recovery

  • Reviewed By NRC
  • February 11, 1992
  • Required Condensate

- 266000 gallons

- Decay Heat (ANSI + 2a)

Sensible Heat

- RSG Inventory Recovery

  • Analyzed Using CENTS Code
  • Methodology Change

Palo Verde Integrated AFWS Flow (Ibm)

-15 E l

li 41

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Palo Verde

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Evaluation of Condensate Inventory

  • Available Condensate Inventory CST 300,000 gallons (Minimum Tech Spec) 300,000 gallons Available (Not Tech Spec)

- RMWT

Palo Verde XW -

Evaluation of Class IE Battery Capacity

  • No Effect on Class lE Battery Capacity From 16 hr Coping

- Battery Chargers are Loaded on to GTG Within 1 hr Original Analysis Sized the Batteries to Support SBO for 2 Hours

- Equipment Credited in the First Hour Remains Bounding

Palo Verde

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Evaluation of Compressed Air Capacity

  • 4 hr Coping
  • 16 hr Coping ADVs ADVs
  • Nitrogen Backup 3082 gallon Tank 65000 ft3 HP Cylinder to Support 1 hr Duration
  • Reviewed By NRC July 28, 1992
  • Portable Diesel Driven Air Compressor Will be Available for Connection to Instrument Air Header

- RCP Seal Bleedoff

  • No Change to IA Backup April 13, 1994

Palo Verde Evaluation of Loss of Ventilation Control, AFWP, DC Equip and Battery Rooms

  • 4 hr Coping Cooling is Loaded on to GTG for the Following Rooms Within 1 hr.
  • Control Room
  • AFWP Room
  • 16 hr Coping No Effect on the Heat loads Due to 16 hr Coping or Power Uprate Cooling will Be Loaded on to the GTG within 1 hr.
  • DC Equipment Room
  • Switchgear Room
  • Battery Room
  • Reviewed by the NRC

- Feb 11, 1992 July 28, 1992

  • No Effect Due to 16 hr Coping Strategy Change

Palo Verde Evaluation of Loss of Ventilation Charging Pump Room and MSSS Bldg Upper Elev.

  • 4 hi-Coping
  • No Credit was Given for Room Cooling for the Following:

- Charging Pump Room

- MSSS Upper Elevation

  • Review by the NRC

- Feb 11, 1992

- July 28, 1992

  • 16 hr Coping No Credit is Given for Room Cooling for the Identified Rooms, Steady State Temperature in Chg Pump Room &MSSS Building Remains Below Equipment Qualification Temperature Criteria

Palo Verde X1/

Evaluation of Loss of Ventilation Containment

  • 4 hr Coping
  • 16 hr Coping
  • Containment In house Code

- Utilizes NUMARC Criteria

- Heat Sinks Per NUMARC Perform Temperature Transient Analysis Vs Steady State Solution

- Results Demonstrate Containment P/T remains bounded by the LOCA P/T Containment COPPATA Code

  • NRC Approved
  • Used for Containment P/T analysis for LOCA
  • Heat Sinks Per UFSAR 6.2 Results Demonstrate containment P/T remains bounded by the LOCA Methodology Change

Palo Verde Comparson of Containment Vapor temperature SBO and limiting LOCA 1-



300 280 260 240 L.I-E1 80 160 140 120 100 0

10 20 Time (hr)

Palo Verde Comparson of Containment pressure SBO and limiting LOCA 80

-SBO @120gpm leakage LOCA 70-60 -

50 1C) a 40-Max i 27.5 PSIA 16 hr 30-20 5

10 0.00 5.00 10.00 15.00 20.00 Time (hr)

Palo Verde Evaluation of Containment Isolation

  • 4 hr Coping
  • Containment Isolation Valves Were reviewed for the applicability or exclusion to NUMARC 87-00 Criteria and found acceptable
  • Located in UFSAR Tables 6.2.4-1 & 6.2.4-2
  • Reviewed by the NRC

- April 13, 1994

  • 16 hr Coping
  • Will Not Reach RAS at 16 hrs
  • No Impact to the Containment Isolation capability due to PUR Or 16 hr Coping

Palo Verde Evaluation of Communication

  • EPABX (Telephone)
  • Plant 2 Way Radio 8 hr battery 4 hr battery, Transfer Switch
  • Sound Power Phones

Palo Verde Evaluation of Communication

  • 4 hr Coping
  • Primary Modes of Communication EPABX Telephone Sound Power Phone Radios
  • Reviewed by the NRC April 13, 1994
  • 16 hr Coping
  • Primary Mode of Communication EPABX Telephone
  • (8 hr Battery back-up)

Radios

  • (4 hr Battery back-up)
  • (Transfer Switch)

Sound Power Phone

  • Sufficient Battery Back-up to Cope for 1 Hour Until GTG Loads the Radio System

Palo Verde r

Summary

  • Methodology Changes Will Be Introduced for Consistency With the Current Safety Analysis Methods
  • New Equipment and Procedure Changes Are Necessary for Implementation of the 16 hr Coping Strategy
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