flex mods: effect on industry and u2 startup

FLEX MODS: EFFECT ON INDUSTRY AND U2 STARTUP

Joe Calle Manager – WBN Dual Unit Interface and Transition

Bob Williams WBN Flex Project Manager

OBJECTIVES 1) Explain the consequences of the tsunami

inundating the Fukushima plant site.

2) Identify actions taken by the Nuclear Regulatory Commission (NRC) and the Institute of Nuclear Power Operations (INPO).

3) Explain the Station Blackout rule (SBO).

OBJECTIVES (continued)

4) Explain Diverse and Flexible Coping Strategies(FLEX).

5) Identify WBNs response and actions taken to NRC and INPO requirements concerning the Fukushima disaster.

Introduction

The earthquake and tsunami at the Fukushima Nuclear Plant (March 2011) resulted in significant damage to the facility.

Before

After

Introduction

Earthquake epicenter was off the coast. • The earthquake resulted in a large tsunami that is estimated to have

exceeded 45 feet. • Units 1, 2, and 3 were in

operation • 5, and 6, were shut down for

routine refueling • Unit 4 reactor fuel had been

offloaded into the Unit 4 spent fuel pool

The Accident

The plant staff were challenged with: • Loss of all A/C power. • Control and instrument power was limited and soon failed. • No means for cooling the Spent Fuel Pool (SFP). • Lost long term core cooling capability.

The Accident

Following the earthquake: • The three operating units automatically shut down

• Offsite power was lost to the entire facility • Emergency diesel generators started at all six units

The facility response to the earthquake was normal.

The Accident

Approximately 40 minutes following the earthquake and shutdown of the operating units, the first large tsunami wave inundated the site. The tsunami caused extensive damage to site facilities and resulted in a complete loss of all ac electrical power on Units 1 through 5.

The Accident

Control Room Emergency Diesel

Electrical Switchgear

Battery Room

Flooded Buildings

The Accident

Unit 6 retained the function of one air-cooled emergency diesel generator and shared this power with unit 5. Operators lost the ability to cool the fuel in the Units1, 2 and 3. Damage to the nuclear fuel occurred shortly after the loss of cooling capabilities on these units.

The Accident

Workers wearing protective suits work to restore electricity at the Fukushima nuclear power plant.

Near-Term Task Force March 23, 2011 the NRC Chairman directed the staff to establish the Near-Term Task Force (NTTF) The NTTF recommended revising the NRC’s Station Blackout (SBO) rule (Title 10 of the Code of Federal Regulations (10 CFR) section 50.63). Advanced Notice of Proposed Rulemaking has been issued in Federal Register. August 2011 INPO issued IER 11-4 in response to NRC NTTF SBO recommendations. March 2012 NRC issued Order EA-12-049 to Modify Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis Events. March 2012 NRC issued Order EA-12-051, to Modify Licenses with Regard to Reliable Spent Fuel Pool Instrumentation.

Industry Response August 2012 Nuclear Energy Institute (NEI) issued Rev 0 of NEI 12-06 “Diverse and Flexible Coping Strategies (FLEX) Implementation Guide”. NEI 12-06 was endorsed by NRC in August 2012 by JLD-ISG-2012-01 “Compliance with Order EA-12-049, Order modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events”. August 2012 NEI issued Rev 1 of NEI 12-02 “Industry Guidance for Compliance with NRC Order EA-12-051”. NEI 12-02 was endorsed by NRC in August 2012 by JLD-ISG-2012-03 “Compliance with Order EA-12-051, Reliable Spent Fuel Pool Instrumentation”.

SBO Rule 1. Establish a minimum coping time of 8 hours for a loss of all

AC Power.

2. Establish the equipment, procedures, and training necessary to implement an ‘‘extended loss of all AC Power (ESBO)’’ coping time of 72 hours for certain Critical Safety Functions:

A. Core cooling B. Spent Fuel Pool (SFP) cooling C. Reactor Coolant System (RCS) and primary containment integrity.

3. Preplan and pre-stage offsite resources to Support the Critical Safety Functions

Include the ability to deliver the equipment to the site in the time period allowed for extended coping, under conditions involving significant degradation of offsite transportation infrastructure associated with significant natural disasters.

TVA plants can not meet the ESBO requirements without :

• Supplemental Diesel Generators for 6.9 KV Shutdown Boards.

• Supplemental Diesel Generators for DC and AC control systems.

• Diesel powered pumps to provide make up water to the Steam Generators.

SBO Rule (continued)

NEI 12-06 FLEX

NEI 12-06 FLEX Plan to implement NRC Order EA-12-049

Three Phase approach: • Initially cope by relying on installed plant equipment. • Transition from installed plant equipment to on-site FLEX equipment. • Obtain additional capability and redundancy from off-site equipment

until power, water, and coolant injection systems are restored or commissioned.

NEI 12-06 FLEX NEI 12-06 FLEX Plan to implement NRC Order EA-12-049

Boundary Conditions • Beyond-design-basis external event occurs impacting all units on site. • All reactors on-site initially operating at power, unless site has procedural

direction to shut down due to the impending event. • Each reactor is successfully shut down when required (i.e., all rods inserted, no

ATWS). • On-site staff are at site administrative minimum shift staffing levels. • No independent, concurrent events, e.g., no active security threat. • All personnel on-site are available to support site response. • Spent fuel in dry storage is outside the scope of FLEX.

…the FLEX strategies are also “diverse and flexible” such that they can be implemented in many different conditions as it is not possible to predict the exact site conditions following a beyond-design-basis external event. As such, the strategies can be implemented in all modes by maintaining the portable FLEX equipment available to be deployed during all modes.

NEI 12-06 FLEX

FLEX Response Select FLEX equipment and Plant Connection points to meet FLEX requirements:

• Engineering:

• Procure and install two 3 MW diesel generators with rapid connection strategy.

• Procure and install two 225 kva diesel generators with rapid connection strategy

• Procure diesel driven and electric motor FLEX pumps (Dominator, Tritons, Intermediate Pressure, and High Pressure)

• Provide structure to protect FLEX Equipment from environmental events. FLEX Equipment Storage Building will protect FLEX equipment.

• Provide FLEX Connections into the following systems:

ERCW RWST BAT

SFP Cooling TWST PWST

Safety Injection Aux FW DWST

FLEX Response

Operations and Maintenance procedures: • Develop and issue new class of procedures called FLEX Support

Guidelines (FSG)

WBN Training: • Develop/conduct training for connecting and maintaining FLEX

equipment.

FLEX Response

Watts Bar Nuclear Modifications for U1R12 • Install two 3 MW Air Cooled D/Gs and connect to Shutdown boards

through Existing SR DG Building Cables. • Install two 225 kva Air Cooled D/Gs and connect to battery chargers

and RMOV boards. • Construct a hardened Aux FW Supply Tank (AFWST) and piping to

supporting AFW pump suction to ensure SG cooling water supply is available.

• Install FLEX connection points into required systems at multiple locations.

• Provide ARV and AFW LCV backup control stations above flood level PMF

WATTS BAR MITIGATION STRATEGIES SITE IMPLEMENTATION

Contract Partners

Design Organizations: • Westinghouse - Integrator • Bechtel - WBN • Bechtel - Frederick • Sergeant & Lundy • Worley Parsons • MESA • URS • CB&I • Scientech • Rizzo • Facilities Risk Consultants (FRC) • AMAC • Pacific Engineering – Dr. Walt Silva • University of Texas – Dr. Ken Stoke • University of Tennessee – Dr. Bob Hatcher

Implementing Organizations: In-Plant Modifications: • Bechtel (U2) – 15% • Day & Zimmerman (U1 and Common) – 85% • Mechanical Taps • Electrical Disconnects/Transfer Switches • N2 Station Relocation • Seismic Mod Exterior-Plant Modifications: • Aux. Feedwater Storage Tank (AFWST) - URS/CB&I • FLEX Equipment Storage Tank (FESB) - Kiewit

FLEX Equipment Storage Building (FESB) and Auxiliary Feedwater Storage Tank (AFWST)

Design and Purpose

Flex - Forms/Rebar Preparations

Fukushima Flex Strategies

• Portable and Pre-staged (FLEX) Equipment – Portable Pumps – Generators – Hoses/connections – Disaster kits – Portable MET Tower – Nitrogen Bottles – Tow vehicle – Portable Fans – Debris removal equipment

FLEX Equip. Storage Bldg.

Flex – AFWST - SSI Micro Piles, Slab, Tank Fabrication

FLEX Equipment Storage Building Key Mechanical Equipment

Flex - Mechanical The Triton 5000 Pumping System is a single, integrated pumping module capable of pumping 5,000 gpm at 350 ft total dynamic head(150 psig).

It uses a satellite pumping system consisting of two floating submersible source pumps that supply water to a Dominator pump at distances up to 150 ft.

The floating submersible pumps can provide up to 50 ft of vertical lift.

Three LP Flex Pump 5000 gpm Portable Diesel Pump

Flex - Mechanical Two IP FLEX Pump (Diesel Driven) 150 gpm @ 922 ft hd

Two Each (Flood - Mode 5&6) IP FLEX Pump (Motor Driven) 150 gpm @ 922 ft hd

Three HP FLEX Pump (Motor Driven) 40 gpm @ 1384 ft hd.

Two FLEX Transfer Pump 500 gpm @ 374 ft hd

IP (Motor Driven) Pump/Motor Assembly

Fukushima Flex Strategies • Water Sources include:

• New Auxiliary Feedwater Supply Tank • Refueling Water Storage Tank • Condensate Storage Tank • Primary Water Storage Tank • Demineralized Water Storage Tank • Boric Acid Tank • Tritiated Water Storage Tank • Ultimate Heat Sink • Flood Waters

Flex – Haul Route PA Fence

FLEX Physical Plant Connections and Tie-ins

Flex - Mechanical

Safety Injection Tap – HP FLEX Injection

Flex - Mechanical

Refueling Water Storage Tank

Flex - Mechanical

Boric Acid Tank (BAT)

Flex - Mechanical 1A&1B MDAFW-HPFP Before/After

TDAFW

Flex - Mechanical

ERCW Header in 5th Diesel Generator Building

ERCW Taps in Aux Bldg.

Flex - Mechanical

Demin/ERCW feeds to SFP

Flex - Mechanical

Demineralized Water Storage Tank

Flex - Mechanical

Primary Water Storage Tank

Flex - Mechanical

Tritium Water Storage Tank (TWST)

FLEX 480V and 6900V Diesels

480V Flex Diesel Generator

480V Flex Diesel Generator

6900V Flex Diesel Generator

Nitrogen (N2) Station Relocation

Flex – N2 for AFW LCVs/ARVs B-Train

Spent Fuel Pool Level Instrumentation

Flex - Spent Fuel Pool

Cable Probe will provide 26’ measurement span to just above top of the fuel racks

Spent Fuel Pool Level Instrumentation

The new instruments will use guided wave radar technology

SFP Level – Guided Wave Radar

WBN FLEX Regional Response Center (RRC) Update

WBN RRC Support Activities Watts Bar staging area B

The Watts Bar helicopter pad is the B staging area. It is located west of the Watts Bar training building.

Staging Areas Watts Bar staging area C

Rockwood Municipal Airport located at 258 Rockwood airport Dr. in Rockwood, TN 37854. the airport has a 5000 x 100 ft. runway and is located 34 driving miles from

WBN. 100LL JET-A fuel onsite, a backup power generator and food and shelter facilities with ample parking and staging space. Located directly off I-40 west of Kingston, TN.

• Watts Bar staging area D • The Cleveland Regional Jetport has a 5,500 ft. concrete runway, aviation and diesel fuel

onsite, a backup power generator and food and shelter facilities onsite. It can accommodate a MD-80 aircraft. Parking areas are ample and additional parking areas for tractor trailers is planned to be expanded by the fall of 2014.

Site/RRC FLEX Equipment WBN On-site FLEX Equipment RRC Generic Equipment 2- 6900v DGs 2- 480 VAC DGs 480VAC DGs 3- 20 GPM HP Pumps High Pressure Pump 3 - 5000GPM Dominator Pumps Diesel Fuel Transfer 3 – 5000 GPM Triton Pumps LP/Med flow Pump 2 -150 GPM IP Diesel Driven Pumps LP/High flow Pump 2- 150 GPM IP 480V Pumps SG/RPV Makeup Pump 2-150 GPM Mode 5&6 480V Pumps SAFER Team Equipment 2- 500 GPM H2O Trans. Diesel Driven Pumps Hoses and Connections 2 -250 GPM SFP Spray Nozzles Connection Cable 2 – Tow Vehicles w/ Mounted Fuel Tank Portable Lighting 2- Trailer Diesel Fuel Tanks Transfer Pumps 1- Compact Track Loader w/ Attachments Debris Clearing Equipment RRC Non- Generic Equipment Hoses and Connections Lift Pump for Dominator Diesel Electrical Connection Mobile Boration skid Portable Light Stands Mobile Demin Skid

Communications

• Additional Communications capability will be provided by: • New protected phone system • Satellite Phones • Radios • Mobile Met Tower