ML120900404
| ML120900404 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 03/30/2012 |
| From: | Nuclear Innovation North America |
| To: | Misenhimer D NRC/NRO/DNRL/LB3 |
| Misenhimer D, NRO/DNRL/LB3/301-415-6590 | |
| References | |
| Download: ML120900404 (57) | |
Text
STP 3 & 4 ABWR Fukushima Evaluation STP 3 & 4 Capabilities and SECY-12-0025 Recommendations for Enhancing Reactor Safety Post-Fukushima Dai-ichi
2 NINA Attendees Scott Head Manager, Regulatory Affairs, STP 3 & 4 Steve Thomas Manager Engineering, STP 3 & 4 Bill Mookhoek Supervisor, Licensing, STP 3 & 4 Coley Chappell Licensing Engineer, STP 3 & 4 Jim Tomkins Licensing Engineer, STP 3 & 4 Dick Bense Licensing Engineer, STP 3 & 4 Tom Daley Engineering, STP 3 & 4 Milton Rejcek Engineering, STP 3 & 4 Brian McDonald Principal Engineer, Exponent Steve Frantz Attorney, Morgan Lewis & Bockius Al Gutterman Attorney, Morgan Lewis & Bockius Robert Schrauder Vice President, Licensing, TANE Bob Quinn ABWR Project Manager, Westinghouse
3 Desired Outcomes
- Common Understanding of:
9Existing STP 3 & 4 capabilities 9Comparison against Tier 1 and Tier 2 recommendations in SECY-12-0025 9Licensing strategy for STP 3 & 4
- At the end of this presentation, we will have demonstrated how STP 3 & 4 has or will address the Fukushima recommendations
4 Agenda
- Overview of Topics
- STP Fukushima Response Activities & Team
- STP 3 & 4 Capabilities and SECY-012-0025 9 Flooding 9 Seismic 9 Other Natural External Hazards 9 Station Blackout 9 Reliable Hardened Vents 9 SFP Instrumentation 9 EOPs, SAMGs, and EDMGs 9 Emergency Preparedness 9 Summary
- Licensing Strategy
- Conclusion - Questions & Comments
5 SECY-12-0025 Issues: Tier 1 Activities 2.1 - Seismic and flooding reevaluations 2.3 - Seismic and flooding walkdowns 4.1 - Station Blackout (SBO) regulatory actions 4.2 - Mitigating strategies for beyond design basis events 5.1 - Reliable hardened vents for Mark I and II containments 7.1 - Spent fuel pool instrumentation 8 - Strengthen & Integrate EOPs, SAMGs, & EDMGs 9.3 - Enhanced EP staffing and communications
6 SECY-12-0025 Issues: Tier 2 Activities 2.1 - Other Natural External Hazards 7.2 - Provide safety-related AC power to the SFP makeup system 7.3 - Revise Tech Specs to address enhanced instrumentation and new AC power requirements 7.4 - Seismically qualified spray to SFP
7 STP 3 & 4 Fukushima Response Activities
- NINA actively participates in the industry to understand and respond to the Fukushima event:
9 Maintains technical services agreement with TEPCO 9 Participates with industry groups (e.g. BWROG, EPRI, NEI) 9 Collaborates with STP Units 1 & 2 9 Collaborates with Toshiba/TANE to understand Japanese response 9 Maintains a focused response team organization
8 STP 3 & 4 Fukushima Response Team Organization Fukushima Response Team NINA Project Manager Steve Thomas 2.1, 2.3 Flood, Seismic &
External Hazards 8.0, 8.1, 8.2, 8.3, 8.4 EOPs, SAMGs, and EDMGs 9.3, 9.4 SBO Emergency Procedures Fukushima Response Team TANE Project Manager Fukushima Response Team STP 1&2 Project Manager BWROG EPRI 7.0, 7.1, 7.2, 7.3, 7.4, 7.5 Spent Fuel Pool Instrumentation 5.1 Reliable Hardened Vent 4.1, 4.2 SBO Coping Capability And Equipment Performance
- Reduced risk of core damage events. ABWR core damage frequency (1.6x10-7 per reactor year) is lower than previous generation BWRs (~1x10-5)
- STP 3 & 4 incorporated the Aircraft Impact Amendment including other mitigative features that further reduce risk
- Highly reliable ECCS System with diverse hardwired controls
11 Design features that address Fukushima-like events:
9 Improved Reactor Core Isolation Cooling system (RCIC) turbine/pump 9 SBO mitigation capabilities 9 Combustion Turbine Generator (CTG) 9 Three Trains of Safety Related Makeup to Spent Fuel Pool (SFP) 9 AC Independent Water Addition (ACIWA) (Diesel Fire Pump) 9 Fire Truck, Portable Diesel-Driven Pumps (2) 9 Three Emergency Diesel Generators (EDGs)
Buried EDG Fuel Oil tanks 9 Containment Overpressure Protection System (COPS) 9 Alternate Spent Fuel Pool Make-up Water & Sprays 9 Alternate Feedwater Injection (AFI)
12 ABWR Improved Features RPV water level post-blowdown 2/3 core height with spray cooling Hydraulically operated control rods with single rod operation 2 External recirc loops 9 Variable recirc pumps 9 Flow control valves BWR ABWR Recirc Flow No External Recirc Loops 10 Internal recirc pumps Control Rod Drive Hydraulic and electrical insertion Fine motion control rod drives LOCA Design RPV water level post-blowdown above top of active fuel (TAF)
No large bore pipe RPV penetrations below TAF
13 ABWR Improved Features (continued) 9 Recirc Pump Trip (RPT) 9 Alternate Rod Insertion (ARI) 9 Auto Standby Liquid Control System (SLCS) initiation 1 or 2 division high pressure
+ 2 divisions core spray and low pressure flooding BWR 3 divisions high pressure 9 2 HPCF 9 1 RCIC
+ 3 divisions low pressure flooding 9 3 LPCF ECCS ABWR ATWS Mitigation Features 9 RPT 9 ARI 9 Auto SLCS initiation 9 Fine Motion Control Rod Drive auto run-in 9 Auto feedwater pump runback
14 ABWR Improved Features (continued)
Containment Overpressure Protection System (COPS)
All BWR Mark I containments have variously designed hardened vents Hardened Vent Varies Varies Varies from 4 to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> BWR CTG (one per Unit) plus installed cross ties Alternate AC Source ABWR Station Blackout 10 min ready to load on Combustion Turbine Generator (CTG) 72 hr w/o CTG Spent Fuel Pool Three trains of makeup with safety related power Seismically-qualified external connections on opposite sides of the Reactor Building provide cooling water and sprays
15 ABWR Severe Accident Mitigation Features Inerted primary containment Lower drywell flood capability Lower drywell Basaltic concrete Suppression pool - fission products scrubbing and retention Passive hardened vent (COPS) from the suppression chamber Drywell sumps corium shield AC Independent Water Addition (ACIWA) system DRYWELLCONNECTING VENT DRYWELLHEAD PRIMARY CONTAINMENT VESSEL DIAPHRAGM FLOOR SUPPRESS CHAMBER AIRSPACE (WETWELL)
SPILLOVER VENT
16 STP 3 & 4 Enhancements RCIC Turbine/Pump 9 Simplified design 9 Water lubricated RHR System and Spent Fuel Pool Cooling 9 Any of the three RHR loops can supply fuel pool cooling and makeup Alternate Feedwater Injection Mitigative Strategies
17 Core Damage Frequency - Internal Events ABWR EPRI ALWR Goal Grand Gulf Peach Bottom Surry Sequoyah BWR Plants NUREG 1150 Study PWR Plants 1.6x10-7 1.0x10-5 4.0x10-6 4.5x10-6 4.0x10-5 5.7x10-5 107 106 105 104 103 ABWR DCD Rev. 4 2.9x10-7 AP1000 AP1000 DCD rev 19
18 STP 3 & 4 Capabilities & SECY-12-0025
19 SECY-12-0025 Issues: Tier 1 Activities 2.1 - Seismic and flooding reevaluations 2.3 - Seismic and flooding walkdowns 4.1 - Station Blackout (SBO) regulatory actions 4.2 - Mitigating strategies for beyond design basis events 5.1 - Reliable hardened vents for Mark I and II containments 7.1 - Spent fuel pool instrumentation 8 - Strengthen & Integrate EOPs, SAMGs, & EDMGs 9.3 - Enhanced EP staffing and communications
20 SECY-12-0025 Issues: Tier 2 Activities 2.1 - Other Natural External Hazards 7.2 - Provide safety-related AC power to the SFP makeup system 7.3 - Revise Tech Specs to address enhanced instrumentation and new AC power requirements 7.4 - Seismically qualified spray to SFP
21 The STP Site and Vicinity STP 3 & 4 Gulf of Mexico
22 2.1 Site Characteristics for Flooding Design Basis Flood (SRP 2.4.2, 2.4.3, 2.4.4, 2.4.5 and 2.4.6) 9 Present-day regulatory guidance and methodologies were used to evaluate flooding hazards for the STP 3 & 4 site as discussed in COLA Part 2, Tier 2, Subsection 2.4S.
9 The design basis flood elevation for the STP 3 & 4 site was determined by considering the various flooding scenarios required by the Standard Review Plan (SRP) sections listed above.
9 Flooding scenarios were investigated in conjunction with other flooding and meteorological events, such as wind generated waves and tidal levels, as recommended in ANSI/ANS 2.8 -1992.
9Property "ANSI code" (as page type) with input value "ANSI/ANS 2.8 -1992.</br></br>9" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process. A maximum flood elevation of 38.8 ft Mean Sea Level (MSL) was determined as a result of the analysis (MCR breach).
9 Based on this analysis, the Design Basis Flood was conservatively established as 40 ft MSL
23 Numbers represent elevations (measured in feet) above Mean Sea Level (Drawing not to scale)
Unit 3 & 4 Site Grade
+49
+28
+65.75
+25
+29
+34
+22
+30
+30 MCREmbankment ToeDitch PowerBlockArea NorthDitch
24 2.1 STP 3 & 4 Site Flood Levels Flood Resulting Flood Level Elevation (ft above MSL)
Margin To Design Basis Flood Level (ft)
Design Basis Flood Level 40.0 Main Cooling Reservoir Embankment Breach 38.8 1.2 Local Probable Maximum Precipitation (PMP) 36.6 3.4 Cascading Dams on the Colorado River 34.4 5.6 Probable Maximum Surge and Seiche (PMSS) 31.1 8.9 Probable Maximum Flood (PMF) on Streams and Rivers-Colorado River 26.3 13.7 Probable Maximum Tsunami (PMT) 11.5 28.5 Water Level Above Grade Elevation 34 ft (MSL) 6.0 4.8 2.6 0.4
-2.9
-7.7
-22.5
25 2.1 Site Characteristics for Flooding Cliff Edge Effect is not of concern for these Units 3 & 4 Flood Scenarios.
Scenarios not discussed have significantly greater margin with respect to the Design Basis Flood.
9 Main Cooling Reservoir Embankment Breach 3/4 Embankment breach is not a credible event as described in Units 1 & 2 UFSAR Section 2.4.4.1.1.3 and in Units 3 and 4 COLA Part 2, Tier 2 Subsection 2.4S.4.1.2.
3/4 Historical behavior of rolled-earth fill embankments indicates that the failure of the embankment during a seismic event is extremely unlikely. A seismic evaluation of the embankment was performed as described in Units 1 & 2 UFSAR Section 2.4.4.1.1.3 3/4 The water level of the reservoir is strictly controlled within allowable limits.
3/4 Design normal maximum operating level is elevation 49 ft Mean Sea Level (MSL).
The top of the spillway gates in the closed position is at elevation 49.5 ft MSL.
3/4 The embankment breach analysis performed was conservative in nature.
Breach locations selected were closest to safety related structures.
Breach parameters were estimated using two different empirical equations from the Dam Safety Office of the US Bureau of Reclamation. The most conservative breach width was combined with the most conservative breach speed.
An independent analysis was performed confirming that the design is conservative 3/4 The Main Cooling Reservoir has been in service for more than 25 years.
26 2.1 Site Characteristics for Flooding (continued) 9 Local Probable Maximum Precipitation (PMP) 3/4 PMP is the estimated depth of precipitation for a given duration, drainage area and time of the year for which there is virtually no risk of exceedance. The PMP for a given duration and drainage area approximates the maximum that is physically possible within the limits of contemporary hydrometeorological knowledge and techniques. (ANS 2.8-1992).
3/4 Local intense precipitation is a measure of the extreme amount of water falling in the immediate vicinity of the site, usually taken as the one-square mile PMP. (SRP 2.4.2).
3/4 The design basis for the local intense precipitation is the all season one square mile or local PMP as obtained from the U. S. National Weather Service Hydro-Meteorological Reports (HMR) No. 51 and 52.
The 5-minute, 1-hour and 6-hour one square mile rainfall depths, 6.4 in, 19.8 in and 32.0 in, respectively, are used to develop the rainfall intensity distribution of a 6-hour PMP design storm.
Results from the model yield a water level of 36.6 feet MSL for the Unit 3 & 4 plant area, resulting with a margin of 3.4 feet with respect to the design basis flood level 3/4 Conservatism in the local PMP flooding analysis:
Peak runoff flow rates from power block sub-basins are assumed to occur simultaneously leading to a higher combined peak discharge rate
Peak discharge flow to the channels is assumed to remain within the model boundary leading to higher flood level
Overflow to adjacent drainage areas outside the model domain is not allowed
27 2.1 Site Characteristics for Flooding (continued) 9 Cascading Dams on the Colorado River 3/4 56 upstream dams on the Colorado River and its tributaries fail in such a manner that their flow, based on maximum volume, would arrive at a single significant dam (Buchanan Dam) at approximately the same time triggering the failure of that dam.
3/4 This dam break flow would then propagate downstream to the next significant dam (Mansfield Dam),
causing it to fail releasing the water downstream.
3/4 In addition, the dam failures were postulated to occur coincidently with a 2-year design wind event and a 500,000 cfs constant flow in the river, which is higher than the Standard Project Flood inflow to Buchanan Dam and the 500-year inflow to Mansfield Dam.
3/4 Results of the analysis yield a water level of 34.4 feet MSL for the Unit 3 & 4 plant area, resulting with a margin of 5.6 feet with respect to the design basis flood level.
9 Probable Maximum Surge and Seiche 3/4 Two different recognized methods were used to estimate the storm surge. The methods included SURGE and SLOSH with respective surge level results of 24.29 ft and 31.1 ft MSL.
3/4 31.1 ft MSL was conservatively selected as the flood level due to surge and seiche. This result is a margin of 8.9 ft with respect to the Design Basis Flood.
3/4 In addition, ADCIRC was used to validate the results of the SURGE and SLOSH models.
ADCIRC has been validated for recent hurricanes.
ADCIRC uses state of the art topographical and bathymetric data.
ADCIRC is FEMA certified and is the standard coastal model used by the United States Army Corp of Engineers.
Wind field inputs into ADCIRC model were equivalent to those described in RG 1.221, Design-Basis Hurricane and Hurricane Missiles for Nuclear Power Plants (dated October 2011).
The ADCIRC method resulted in the surge level reaching 29.3 ft MSL.
28 2.1 Site Characteristics for Seismic Hazard in the STP 3 & 4 COLA
29 2.1 Site Characteristics for Seismic Hazard in the STP 3 & 4 COLA Vibratory Ground Motion (SRP 2.5.2, 3.7.1, RG 1.208, March 2007)
Present-day regulatory guidance and methodologies were used to evaluate seismic hazards relative to the STP 3 & 4 site as discussed in Chapters 2 and 3.
COLA Part 2, Tier 2 Subsection 2.5S.2 describes the evaluation that was performed in conformance with Regulatory Guide (RG) 1.208, which provides acceptable methodology for:
9 conducting geological, geophysical, seismological, and geotechnical investigations; 9
identifying and characterizing seismic sources; 9
conducting a probabilistic seismic hazard assessment (PSHA);
9 determining seismic wave transmission (soil amplification) characteristics of soil and rock sites; 9
determining a site-specific, performance-based GMRS satisfying the requirements of 10CFR100.23, and leading to the establishment of a site-specific SSE to satisfy the design requirements of Appendix S to 10 CFR Part 50.
The Certified Seismic Design Response Spectra (CSDRS) for the GE ABWR Design Control Document (DCD) is based on RG 1.60 response spectra anchored at 0.3 g. The CSDRS envelopes the GMRS.
The site-specific SSE response spectra for STP 3&4, as it appears in the current COLA (Part 2, Tier 2, Figures 3.7-1a and 3.7-2a), envelope the GMRS. The site-specific SSE response spectra are based on RG 1.60 anchored at 0.13 g scaled up in the low frequency range.
30 2.1 Site Characteristics for Seismic Hazard in the STP 3 & 4 COLA (continued)
31 2.1 Site Characteristics for Seismic Hazard per CEUS SSC Central and Eastern United States Seismic Source Characterization for Nuclear Facilities Report (January 31, 2012)
A study of seismic source characterization for Central and Eastern United States (CEUS) has recently been completed.
Site-specific hazard curves for plants based on CEUS site source characterization have not yet been developed.
However, the CEUS Site Source Characterization Report does provide demonstration hazard curves (1 Hz, 10 Hz and Peak Ground Acceleration, horizontal motions) for a Houston site relatively 80 miles north of STP.
A new performance-based (RG 1.208) GMRS was calculated based on information contained in the CEUS Site Source Characterization Report for Houston, but utilizing STP site specific soil amplification.
9 Demonstration hazard curves at 1 Hz, 10 Hz and PGA for a Houston rock site as provided in the CEUS Site Source Characterization Report.
9 STP site-specific soil amplification presented in COLA Part 2, Tier 2, Chapter 2.
The GMRS derived from the CEUS source characterization for Houston utilizing STP site soil amplification is similar to the design basis GMRS developed for STP 3 & 4 COLA (Part 2, Tier 2, Figure 2.5S.2-52), essentially confirming the original work.
In summary, this investigation found no reason to revisit the seismic design basis in STP 3 & 4 COLA.
32 2.1 Site Characteristics for Seismic Hazard per CEUS SSC (continued)
33 2.1 Other Natural External Hazards Hurricane Katrina August 2005 Category 3 (at landfall)
34 2.1 Other Natural External Hazards SECY-12-0025:
NTTF recommendation 2.1 expanded to include Other Natural External Hazards The NRC will undertake regulatory actions to ensure that SSCs important to safety will withstand other natural external hazards. These other external hazards include meteorological phenomena such as wind and missile loads from tornadoes and hurricanes, maximum rainfall rates and snow and ice load for roof design, drought and other low-water conditions that may reduce or limit the available safety-related cooling water supply, extreme maximum and minimum ambient temperatures for normal plant heat sink and containment heat removal systems (post-accident), and meteorological conditions related to the maximum evaporation and drift loss and minimum water cooling for the UHS design.
NRC staff concluded that sufficient regulatory guidance currently exists to evaluate these issues. However, to the extent practical, new information about events at Fukushima should be considered.
35 2.1 Other Natural External Hazards (continued)
- COLA documents STP 3 & 4 Site and SSC have already been evaluated against current regulatory guidance for each of the following:
9 Design basis tornado 9 Severe Wind (100-Year Wind Speed) 9 Precipitation (for Roof Design) 9 Ambient Design Temperatures 9 Ultimate Heat Sink Design Basis (Low Water Level) 9 Other phenomena potentially significant for a particular site include:
3/4 Thunderstorms and Lightning 3/4 Water Spouts 3/4 Forest and Grass Fires 3/4 Volcanic Activity 3/4 Drought
- RG 1.221 Design Basis Hurricane and Hurricane Missiles for Nuclear Power Plants issued October 2011, being addressed in COLA.
- Evaluation of Other Natural External Hazards designated Tier 2 activity.
3/4 Biological Events (cooling water and fuel oil) 3/4 Frost 3/4 Hail 3/4 River Diversion
36 4.1 SBO Rulemaking STP 3 & 4 has design features that mitigate the impact of SBO, such as:
9 The use of CTGs as alternate AC power sources for the prime mitigation against SBO (CTG ready to load in 10 minutes). The CTGs are protected against design flooding and adverse site weather conditions.
9 Battery capacity allows coping for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
9 A preliminary evaluation indicates that batteries will last in excess of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> by load-shedding and battery cross-ties.
37 4.1 SBO Rulemaking (continued) 9 STP 3 & 4 uses an advanced RCIC pump design that minimizes load requirements and the potential for pump failures:
3/4 Internal water lubrication 3/4 No external cooling water 3/4 No mechanical seal 3/4 No electrical connections 3/4 Integral mechanical governor 3/4 No barometric condenser 9 The ABWR design incorporates a seismically-qualified system with an external permanent diesel-driven fire pump capable of providing water to the RHR system for core and containment cooling (ACIWA). An external connection to ACIWA provides the capability of temporarily connecting a staged water supply pump (DCD Tier 1 Sec. 2.15.6).
38 AC Independent Water Addition Standpipe LPFL Pump Diesel Driven Fire Pump (Installed)
Outdoor Fire Truck Connection Reactor Building Wall Drywell Spray Drywell MO MO MO Reactor Vessel MOV Wetwell Spray Supply Tank
39 4.1 SBO Rulemaking (continued)
9 Operate RCIC/SRVs for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 9 Depressurize and switch to ACIWA 9 COPS break disk ruptures at ~32 hours Results:
9 Core cooling and containment integrity maintained in excess of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> 9 No core damage
40 UO2 Temperature Loss of all AC, RCIC Runs Eight Hours, Firewater Addition Prevents Core Damage, Rupture Disk Opens 4.1 SBO Rulemaking (continued)
41 Drywell Pressure 4.1 SBO Rulemaking (continued)
Loss of all AC, RCIC Runs Eight Hours, Firewater Addition Prevents Core Damage, Rupture Disk Opens
42 4.1 SBO Rulemaking (continued)
- Additionally, STP 3 & 4 design includes redundant seismically-qualified external connections on opposite sides of the RB to provide make-up water and sprays to the SFP with the use of staged water supply pumps (Mitigative Strategies).
- STP 3&4 has significant battery, water and diesel fuel capacities that can be used as necessary.
43 4.1 SBO Rulemaking (continued)
Stored Water* Resources Available to STP 3&4 1 per unit 945,700 gallons Suppression Pool 2 total for STP 3 & 4 11,888 gallons Potable Water Storage Tank 1 per STP 3 & 4 site 118,877 gallons Filtered Water Storage Tank 1 per STP 3 & 4 site 118,877 gallons Well Water Storage Tank 2 total for STP 3 & 4 300,000 gallons Fire Water Storage Tank 2 total for STP 3 & 4 200,770 gallons Demin Prover Tank 2 total for STP 3 & 4 501,927 gallons Demineralized Water Storage Tank 1 per unit 557,403 gallons Condensate Storage Tank 1 per unit 2,060,542 gallons Main Condenser Hotwell Number & Location Volume Item
- Notes & comments:
- 1. Does not include Storage Tanks utilized by Units 1 & 2.
- 2. Does not include Ultimate Heat Sink (UHS) or Main Cooling Reservoir (MCR).
44 4.1 SBO Rulemaking (continued)
Fuel Oil Site Inventory 1 per site (for both units) in proximity to diesel fire pump 150 gals.
Diesel Fire Pump (ACIWA) Day Tank 1 per unit near north end of Protected Area to facilitate filling from outside PA 600,000 gals.
Site Fuel Oil Tank 1 per unit in proximity to CTG 7,000 gals.
CTG Fuel Oil Day Tank 3 per unit in under ground vault south of RB 80,000 gals.
EDG Fuel Oil Storage Tank 3 per unit located in RB 4,000 gals.
EDG Fuel Oil Day Tank LOCATION Volume ITEM
45 4.1 SBO Rulemaking (continued)
Station Batteries (per unit)
- Class 1E - 125VDC 9 Div I - 5104 Ah 9 Div II - 3344 Ah 9 Div III - 2992 Ah 9 Div IV - 1368 Ah
- Non-Class 1E - 125VDC 9 Group A - 800 Ah 9 Group B - 800 Ah 9 Group C - 800 Ah
- Non-Class 1E - 250VDC 9 Group A - 6000 Ah
- Non-Class 1E - 125VDC Security Battery
- Non-Class 1E - 48VDC Communications Battery
46 4.2 AC-Independent Pumping Capability
- Installed diesel driven fire pump
- STP 3 & 4 also incorporates three staged AC-independent portable pumping systems:
9 Two pumps (fire truck and trailer mounted portable pump) provide core, SFP and containment cooling water to the RHR system via the ACIWA system shared between Units 3 & 4 9 One pump (trailer mounted portable pump) provides water in the event of the loss of large areas shared between Units 1 - 4 9 Sufficient to address a multi-unit event
47 5 Reliable Hardened Vents (RHV) & Evaluate RHV for other containment designs
- 5.1 is not applicable to the ABWR
- 5.2 to evaluate RHV for other containment designs (Tier 3) 9 The ABWR certified design includes advanced containment vent features such as:
3/4 Passive hardened venting capability 3/4 Vent path is not shared between plants 9 STP 3 & 4 is a participating member of BWROG and is working with the subcommittee on reliable hardened vent design requirements
48 Atmospheric Control System and Reliable Hardened Vent
49 7.1 SFP Instrumentation The ABWR COLA has pertinent SFP design features:
9 SFP level and temperature monitors provide indication via the plant computer and annunciate in the MCR. The instruments are powered by non-Class 1E vital 120 VAC, which is provided by the PIP buses, which are backed-up by the CTG (DCD Sec. 7.7.1.10).
9 Local area radiation monitors are provided in the vicinity of the SFP. These monitors annunciate locally and in the MCR via the plant computer. They are powered by non-Class 1E vital 120 VAC, which is provided by the PIP buses, which are backed-up by the CTG (DCD Sec. 12.3.4.1).
An additional instrument will be added to the design to meet the intent of the Order.
50 7.1 SFP Instrumentation The design of the SFP level instrumentation will incorporate the following features:
9 Wide range indication from the top of fuel racks to the top of the SFP 9 Reasonable protection against missiles that may result from damage to adjacent structures 9 Seismically qualified and supported 9 Environmentally qualified 9 Separate channels and power supplies
51 8 Strengthen EOPs, SAMGs, & EDMGs Strengthening and integration of emergency operation procedures (EOPs), severe accident management guidelines (SAMGs), and extensive damage mitigation guidelines (EDMGs).
STP 3 & 4 development of procedures and guidelines is an Operational Program and will follow Industry (BWROG, NEI) guidance as endorsed by applicable NRC regulatory guides, consistent with the Task Force recommendation (SECY-11-0124).
STP 3 & 4 and generic ABWR DCD Technical Specifications 5.5.1.1 reference EOP technical guidelines 9
Written procedures shall be established, implemented, and maintained covering the emergency operating procedures required to implement the requirements of NUREG-0737 and NUREG-0737, Supplement 1, as stated in Generic Letter 82-33.
Training development requirements will comply with rulemaking for recommendation 8.4.
52 9.3 EMERGENCY PREPAREDNESS
STP 3 & 4 is engaged with NEI through STARS and STP Units 1 & 2
Emergency Plan (EP) is an Operational Program to be implemented by STP Nuclear Operating Company (STPNOC)
STP 3 & 4 EP will be part of site-wide plan for Units 1 - 4
NRC recommendations will be included in detailed procedures developed in concert with STP 1 & 2
ITAAC requires implementing procedures to be submitted to NRC 180 days prior to fuel load
53 Summary of Fukushima Tier 1 Issues STP 3 & 4 Status Topic STP 3 & 4 is capable of mitigating an extended 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> SBO Station Blackout 4.1 Fire truck and portable pumps are currently in design. Industry FLEX will be implemented.
Mitigating Strategies for Beyond Design Basis 4.2 Not Applicable ITAAC will confirm construction in accordance with design Seismic/Flooding Walkdowns 2.3 COLA developed to latest guidance Seismic/Flooding 2.1
54 Summary of Tier 1 Fukushima Issues (continued)
STP 3 & 4 Status Topic This will be addressed as operational program in concert with industry and STP Units 1 and 2 Emergency Procedures address Extended SBO and Multi-unit events 9.3 This is addressed as operational program, will follow industry guidance and will be in concert with STP Units 1 and 2 Emergency Procedures Rulemaking 8
SFP level that addresses the SFP Order will be added in COLA Rev. 8 SFP Instrumentation 7.1 COPS is a passive and reliable hardened vent system Reliable Hardened Vent 5.1
55 Summary of Tier 2 Fukushima Issues Hazards have been screened and evaluated in accordance with the latest revision of the SRP & RG 1.221 Other Natural External Hazards 2.1 STP 3 & 4 Status Topic STP 3 & 4 design has installed redundant standpipes SFP Spray 7.4 At least one EDG and RHR subsystem are required to be Operable in all Modes One EDG available when irradiated fuel is in SFP 7.3 STP 3 & 4 has three safety-related trains of makeup Safety-Related AC Power for SFP Makeup 7.2
56 Licensing Strategy
Fukushima capabilities discussed in this presentation will be documented in COLA Rev. 8 9 Supplemental Appendix 1E addressing SECY-12-0025 issues 9 Structure similar to Appendix 1A, TMI Issues 9 Roadmap to existing sections of COLA 9 SFP level instrumentation details
STP 3 & 4 will continue to actively participate with Owners Groups, NEI, and INPO as Fukushima response continues to evolve.
9 Emergency Planning and integration of EOPs, SAMGs, and EDMGs will be done in concert with the industry and STP Units 1 & 2
If any future Fukushima recommendations require changes to STP 3 & 4, they will be implemented via the appropriate regulatory process post-COL.
57 Conclusion Questions and Comments