ML051540101

Meeting Presentation Slides on Station Black Out

ML051540101
Person / Time
Site:	Palo Verde
Issue date:	05/24/2005
From:	Arizona Public Service Co
To:	Office of Nuclear Reactor Regulation
References
Download: ML051540101 (27)

Text

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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

• APS Power Uprate License Amendment Request

- 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

• NRC RAI to APS

- 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 Credited Future Strategy (16 hr Coping

• 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

• 16 hr Coping

- Core Remains Covered - Core Remains Covered

- Credits Reflux Boiling - Natural Circulation

• Reviewed by NRC

• February 11, 1992

Palo Verde Hot Leg Temperatures (OF) tL5s ja:- am0 31 CI.,

I-I U10 Wo.

Palo Verde Cold Leg Temperatures (OF) 550 ARCl 450 2t~ 4cMJ.

2CU n DO Time (seconds,)

Palo VerdePressurizer Pressure

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

Palo Verde Pressurizer Level (ft) 25 -

0 - 15

- - - - - - - . . . . . . . . . l ID 5 ---- ......... . . .. .. . ..

15 0 1OOD 20000 30000 4000D 50000 0i000 lime (seconds)

Palo Verde Leak Flow (per RCP)

(Ibmlsec) 2 - - - - . . . . . .. - -.-- - -

1.2j . .

I

Palo1Vrde Evaluation of Condensate Inventory

• 4 hr Coping

• 16 hr Coping

• Required Condensate

• Required Condensate

- 156000 gallons - 266000 gallons

- Decay Heat - Decay Heat (ANSI + 2a)

- Sensible Heat - Sensible Heat

- SG Inventory Recovery - RSG Inventory Recovery

• Per NUMARC Guidelines

• Analyzed Using CENTS

• Reviewed By NRC Code

• February 11, 1992

• Methodology Change

Palo Verde Integrated AFWS Flow (Ibm)

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Palo Verde -\ I/

Evaluation of Condensate Inventory

• Available Condensate Inventory

- CST 300,000 gallons (Minimum Tech Spec)

- RMWT 300,000 gallons Available (Not Tech Spec)

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 ,S I/

Evaluation of Compressed Air Capacity

• 4 hr Coping

• 16 hr Coping

- ADVs - ADVs

• Nitrogen Accumulator

• Insufficient Margin with

- RCP Seal Bleedoff Nitrogen Accumulator.

• Nitrogen Backup

• Portable Diesel Driven Air Compressor Will be

- 3082 gallon Tank Available for Connection

- 65000 ft3 HP Cylinder to Support 1 hr Duration to Instrument Air Header

- RCP Seal Bleedoff

• Reviewed By NRC

• No Change to IA Backup

- July 28, 1992

- April 13, 1994

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

• 4 hr Coping

• 16 hr Coping

- Cooling is Loaded on to GTG - No Effect on the Heat loads for the Following Rooms Due to 16 hr Coping or Power Within 1 hr. Uprate

• Control Room - Cooling will Be Loaded on to

• AFWP Room the GTG within 1 hr.

• DC Equipment Room

• Switchgear Room

• Battery Room

• Reviewed by the NRC

• No Effect Due to 16 hr

- Feb 11, 1992 Coping Strategy Change

- July 28, 1992

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

• 4 hi- Coping

• 16 hr Coping

• No Credit was Given for Room - No Credit is Given for Cooling for the Following: Room Cooling for the

- Charging Pump Room Identified Rooms,

- MSSS Upper Elevation - Steady State Temperature in

• Review by the NRC Chg Pump Room &MSSS Building Remains Below

- Feb 11, 1992 Equipment Qualification

- July 28, 1992 Temperature Criteria

Palo Verde X1/

Evaluation of Loss of Ventilation Containment

• 4 hr Coping

• 16 hr Coping

• Containment Containment

- In house Code - COPPATA Code

- Utilizes NUMARC Criteria

• NRC Approved

- Heat Sinks Per NUMARC

• Used for Containment

- Perform Temperature P/T analysis for LOCA Transient Analysis Vs

• Heat Sinks Per UFSAR Steady State Solution 6.2

- Results Demonstrate

- Results Demonstrate containment P/T remains Containment P/T remains bounded by the LOCA bounded by the LOCA P/T - Methodology Change

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

• 16 hr Coping

• Containment Isolation Valves

• Will Not Reach RAS at 16 hrs Were reviewed for the

• No Impact to the Containment applicability or exclusion to Isolation capability due to NUMARC 87-00 Criteria and PUR Or 16 hr Coping found acceptable

• Located in UFSAR Tables 6.2.4-1 & 6.2.4-2

• Reviewed by the NRC

- April 13, 1994

Palo Verde Evaluation of Communication

• EPABX (Telephone) 8 hr battery

• Plant 2 Way Radio 4 hr battery, Transfer Switch

• Sound Power Phones

Palo Verde Evaluation of Communication

• 4 hr Coping

• 16 hr Coping

• Primary Modes of

• Primary Mode of Communication Communication

- EPABX Telephone - EPABX Telephone

- Sound Power Phone * (8 hr Battery back-up)

- Radios - Radios

• (4 hr Battery back-up)

• (Transfer Switch)

• Reviewed by the NRC

- Sound Power Phone

- April 13, 1994

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

Palo Verde r Summary

• Regulatory Guide 1.155 Acceptance Criteria for 16 hr Coping Can Be Successfully Demonstrated

• 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