View source for L-MT-17-047, Notification of Full Compliance of Required Action for NRC Order EA-12-049 Mitigation Strategies for Beyond-Design-Basis External Event

{{Adams
| number = ML17187A153
| issue date = 07/06/2017
| title = Notification of Full Compliance of Required Action for NRC Order EA-12-049 Mitigation Strategies for Beyond-Design-Basis External Event
| author name = Gardner P A
| author affiliation = Xcel Energy
| addressee name = 
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000263
| license number = DPR-022
| contact person = 
| case reference number = L-MT-17-047
| document type = Letter type:L
| page count = 107
| project = 
| stage = Other
}}

=Text=
{{#Wiki_filter:Document Control Desk Page4 I declare under penalty of perjury that the foregoing is true and correct. Executed on July k, 2017. Peter A. Gardner Site Vice President, Monticello Nuclear Generating Plant Northern States Power Company-Minnesota Enclosures (2) cc: Administrator, Region Ill, USNRC Project Manager, Monticello Nuclear Generating Plant, USNRC Resident Inspector, Monticello Nuclear Generating Plant, USNRC  

Table of Contents

List of Figures and Tables

===1.0 Background===

2.0 NRC Order EA 049 - Mitigation Strategies (FLEX) 2.1 General Elements 2.1.1 Boundary Conditions

2.1.2 Plant Initial Conditions

2.1.3 Key Assumptions

3.0 Strategies

3.1 Reactor Core Cooling and Heat Removal Strategy

3.1.1 Phase 1 Strategy

3.1.2 Phase 2 Strategy

3.1.3 Phase 3 Strategy

Bus 13 Bus 15 Normal Configuration Bus 14 Bus 16 Bus 13 Bus 15 Bus 14 OR Bus 16 Division I Safeguards Division II SafeguardsNSRC 4KV GenFLEX Phase 3 Configuration3.1.4 Structures, Systems and Components 3.1.4.1 Reactor Core Isolation Cooling (RCIC) System

3.1.4.2 Main Steam Safety/Relief Valves (SRVs)

3.1.4.3 Torus 

3.1.4.4 Hard Pipe Vent System

3.1.4.5 Electrical Systems

1 The one exception is that the Emergency Seal Oil Pump remains in operation to support main generator purging. This load will be shed in hour six.

3.1.4.6 Pneumatic Supply

3.1.5 FLEX Strategy Connections 3.1.5.1 Connection for Cooling Water Supply to the Reactor

3.1.5.2 Alternate Connection for Cooling Water Supply to the Reactor

3.1.5.3 Tertiary Connection for Cooling Water Supply to the Reactor

3.1.5.4 Primary 480 Volt Electrical Connections

3.1.5.5 Alternate 480 Volt Electrical Connections

3.1.5.6 4160V Electrical Connections

3.1.6 Key Parameters 3.1.6.1 Reactor Vessel Essential Instrumentation:

3.1.7 Thermal Hydraulic Analyses 3.1.7.1 MAAP Analysis 3.1.7.2 Reactor Coolant System Losses 

3.1.7.3 RCIC Pump Performance 3.1.8 FLEX Pump and Water Supplies 3.1.8.1 FLEX Pumps

3.1.8.2 Water Sources3.1.9 Electrical Analysis

3.2 Spent Fuel Pool (SFP) Cooling/Inventory

3.2.1 Phase 1 Strategy

3.2.2 Phase 2 Strategy

3.2.3 Phase 3 Strategy

3.2.4 Structures, Systems and Components 3.2.4.1 Primary Connection 3.2.4.2 Alternate Connection 3.2.4.3 Tertiary Connection

3.2.4.4 Spray Option 

3.2.4.5 SFP Area Ventilation

3.2.5 Key Parameters 3.2.5.1 Spent Fuel Pool Essential Instrumentation:

3.2.6 Thermal-Hydraulic Analyses

3.2.7 FLEX Pump and Water Supplies 3.2.7.1 FLEX Pump 3.2.7.2 Water Supplies 3.2.8 Electrical Analysis 3.3 Containment Integrity

3.3.1 Phase 1 Strategy 3.3.2 Phase 2 Strategy

3.3.3 Phase 3 Strategy 3.3.4 Structures, Systems and Components 3.3.5 Key Parameters 3.3.6 Thermal-Hydraulic Analyses

3.3.7 FLEX Pump and Water Supplies 3.3.8 Electrical Analysis

4.0 Characterization of External Hazards 4.1 Seismic 

4.1.1 Protection of FLEX equipment

4.1.2 Considerations in Utilizing Off
-site Resources

4.2 External Flooding

4.2.1 Protection of FLEX equipment 4.2.2 Considerations in Utilizing Off
-site Resources

4.3 Severe Storms with High Winds Assessment

4.3.1 Protection of FLEX Equipment 4.3.2 Considerations in Utilizing Off
-site Resources

4.4 Ice, Snow and Extreme Cold Assessment

4.4.1 Protection of FLEX Equipment 4.4.2 Considerations in Utilizing Off
-site Resources 4.5 High Temperatures 4.5.1 Protection of FLEX Equipment 

4.5.2 Considerations in Utilizing Off
-site Resources

5.0 Protection and Deployment of FLEX Equipment 5.1 Protection of FLEX Equipment

5.2 Planned Deployment of FLEX Equipment 5.2.1 Haul Paths

5.2.1.1 Seismic 

5.2.1.2 Flooding  

5.2.1.3 High Winds

5.2.1.4 Ice, Snow, Extreme Cold

5.2.1.5 High temperature 

5.2.2 Accessibility

5.2.3 Debris/Snow Removal

5.3 Deployment of Strategies5.3.1 Reactor Pressure Vessel Makeup Strategy

To Spent Fuel PoolTo Reactor 

5.3.2 SFP Injection Makeup Strategy

5.3.3 Electrical Strategy

5.3.4 Refueling of FLEX Equipment Strategy     

6.0 Offsite Resources 6.1 National SAFER Response Center

6.2 Equipment List

6.3 NSRC Connections 6.4 Offsite Storage of NSRC Equipment

6.5 Deployment of NSRC Equipment

7.0 Equipment Operating Conditions 7.1 Ventilation

7.2 Heat Tracing

8.0 Habitability Analysis

8.1 Habitability 

8.2 Lighting 

8.3 Communications

8.4 Water Sources

8.4.1 Ultimate Heat Sink Sources 

8.4.2 Condensate Storage Tanks 

.
9.0 Shutdown and Refueling Modes Analysis

10.0 Sequence of Events

11.0 FLEX Program Items 11.1 FLEX Program Document

11.2 Procedural Guidance

11.3 Staffing Analysis

11.4 Training 

11.5 Equipment List

11.6 N+1 Equipment Requirement

11.7 FLEX Equipment Maintenance and Testing

11.8 FLEX Equipment Unavailability

11.9 FLEX Program Supporting Analyses

12.0 References}}