ML13242A011
| ML13242A011 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 08/23/2013 |
| From: | Grecheck E Dominion, Dominion Nuclear Connecticut |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| EA-12-049 | |
| Download: ML13242A011 (34) | |
Text
Dominion Nuclear Connecticut, Inc. 0ih 0Dominion 5000 Dominion Boulevard, Glen Allen, VA 23060 Web Address: www.dom.com August 23, 2013 10 CFR 2.202 EA-12-049 Attention: Document Control Desk Serial No.: 12-161D U.S. Nuclear Regulatory Commission NL&OS/MAE: RO Washington, D.C. 20555-0001 Docket Nos.: 50-336/423 License Nos.: DPR-65 DOMINION NUCLEAR CONNECTICUT, INC. NPF-49 MILLSTONE POWER STATION UNITS 2 AND 3 SIX-MONTH STATUS REPORT IN RESPONSE TO MARCH 12. 2012 COMMISSION ORDER MODIFYING LICENSES WITH REGARD TO REQUIREMENTS FOR MITIGATION STRATEGIES FOR BEYOND-DESIGN-BASIS EXTERNAL EVENTS (ORDER NUMBER EA-12-049)
References:
- 1. NRC Order Number EA-12-049, Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events, dated March 12, 2012
- 2. NRC Interim Staff Guidance 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, Revision 0, dated August 29, 2012
- 3. NEI 12-06, Diverse and Flexible Coping Strategies (FLEX) Implementation Guide, Revision 0, dated August 2012
- 4. Dominion Nuclear Connecticut, Inc.'s Initial Status Report in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049), dated October 25, 2012 (Serial No. 12-161A)
- 5. Dominion Nuclear Connecticut, Inc.'s Overall Integrated Plan in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049), dated February 28, 2013 (Serial No. 12-161B)
- 6. Dominion Nuclear Connecticut, Inc.'s Supplement to Overall Integrated Plan in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049), dated April 30, 2013 (Serial No. 12-161C)
On March 12, 2012, the Nuclear Regulatory Commission (NRC) issued an order (Reference 1) to Dominion Nuclear Connecticut, Inc. (DNC). Reference 1 was immediately effective and directs DNC to develop, implement, and maintain guidance and strategies to maintain or restore core cooling, containment, and spent fuel pool cooling capabilities in the event of a beyond-design-basis external event. Specific requirements are outlined in Attachment 2 of Reference 1.
Reference 1 required submission of an initial status report 60 days following issuance of the final interim staff guidance (Reference 2) and an overall integrated plan pursuant to Section IV, Condition C. Reference 2 endorsed industry guidance document NEI 12-06, Revision 0 weL
Serial No. 12-161D Docket Nos. 50-336/423 Order EA-12-049 Page 2 of 3 (Reference 3) with clarifications and exceptions. Reference 4 provided DNC's initial status report regarding mitigation strategies, Reference 5 provided DNC's overall integrated plan, and Reference 6 provided a supplement to DNC's overall integrated plan.
Reference 1 requires submission of a status report at six-month intervals following submittal of the overall integrated plan. Reference 3 provides direction regarding the content of the status reports. The six-month status reports (pursuant to Section IV, Condition C.2, of Reference 1),
delineate the progress made in implementing the requirements of Reference 1 and are provided as Attachments 1 and 2 (for Millstone Units 2 and 3, respectively) to this letter. The attached reports also provide an update of milestone accomplishments since the supplement to the overall integrated plan (Reference 6), including any changes to the compliance method, schedule, or need for relief and the basis, if any.
If you have any questions, please contact Ms. Margaret Earle at (804) 273-2768.
Sincerely, Eugene S. Grecheck Vice President - Nuclear Engineering and Development Dominion Nuclear Connecticut, Inc.
Attachments:
- 1. Six Month Status Report for the Implementation of Order EA-12-049, Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events - Millstone Power Station Unit 2
- 2. Six Month Status Report for the Implementation of Order EA-12-049, Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events - Millstone Power Station Unit 3 Commitments made by this letter: No new Regulatory Commitments COMMONWEALTH OF VIRGINIA )
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COUNTY OF HENRICO The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Eugene S. Grecheck who is Vice President - Nuclear Engineering and Development of Dominion Nuclear Connecticut, Inc. He has affirmed before me that he is duly authorized to execute and file the foregoing document in behalf of the Company, and that.
the statements in the document are true to the best of his knowledge and belief. CRAIG D SLY
'rotday of A!4"+- 2013. Notary Public Acknowledged before me this Commonwealth of Virginia MyCo miDI6.si n xpre :.t--31 My Commission 1Reg. Expires December 31, 20&.
- 7518653 My CommissionExpires:
Serial No. 12-161D Docket Nos. 50-336/423 Order EA-12-049 Page 3 of 3 cc: Director of Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission One White Flint North Mail Stop 13H16M 11555 Rockville Pike Rockville, MD 20852-2738 U. S. Nuclear Regulatory Commission, Region I Regional Administrator 2100 Renaissance Blvd.
Suite 100 King of Prussia, PA 19406-2713 Mr. J. S. Kim NRC Project Manager Millstone Units 2 and 3 U. S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 C 2A 11555 Rockville Pike Rockville, MD 20852-2738 Ms. J. A. Kratchman U. S. Nuclear Regulatory Commission One White Flint North Mail Stop 09 D2 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1 Six Month Status Report for the Implementation of Order EA-1 2-049, Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events Millstone Power Station Unit 2 Dominion Nuclear Connecticut, Inc. (DNC)
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 1 of 14 Six Month Status Report for the Implementation of Order EA-12-049, Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events I Introduction Dominion Nuclear Connecticut (DNC) developed an Overall Integrated Plan (OIP) (Reference 1), documenting the diverse and flexible strategies (FLEX) for Millstone Power Station Unit 2 (MPS2), in response to NRC Order Number EA-12-049 (Reference 2). This attachment provides an update of milestone accomplishments and open items since submittal of the OIP, including any changes to the compliance method, schedule, or need for relief/relaxation and the basis, if any.
2 Milestone Accomplishments The following milestone has been completed since the development of the OIP, and is current as of July 31, 2013.
0 Submit Integrated Plan 3 Milestone Schedule Status The following table provides an update to Attachment 2A of the OIP. It provides the activity status of each item, and whether the expected completion date has changed. The dates are planning dates subject to change as design and implementation details are developed.
The revised milestone target completion date for 'Develop Strategies' does not impact the Order implementation date.
Target Activity Revised Target Milestone Completion Status Completion Date Date Submit Integrated Plan Feb 2013 Complete Develop Strategies July 2013 Started October 2013 Develop Modifications Feb 2014 Started Implement Modifications Aug 2014 Started Develop Training Plan Apr 2014 Started Implement Training Aug 2014 Not Started Issue FLEX Support Guidelines (FSGs) and Associated Procedure Sept 2014 Not Started Revisions Develop Strategies/Contract with Apr 2014 Started Regional Response Center
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 2 of 14 Target Activity Revised Target Milestone Completion Status Completion Date Date Purchase Equipment Feb 2014 Started Procure Equipment
- Aug 2014 Not Started Validation Walk-throughs or Demonstrations of FLEX Strategies Dec 2014 Not Started and Procedures*
Create Maintenance Procedures Aug 2014 Not Started Outage Implementation Oct 2015 Not Started
- Refer to Section 8 for an explanation of the change to this Milestone.
4 Changes to Compliance Method By letter dated February 28, 2013, Serial No.12-161 B, DNC provided an OIP to address Beyond-Design-Basis (BDB) events at MPS2 and MPS3 as required by Order Number EA 049, dated March 12, 2012. The following are changes to the compliance method for MPS2 that meet NEI 12-06 (Reference 3), but are changes to the information provided in the OIP:
a) Details of the strategy for the portable diesel generators (DGs) used to re-power the 120VAC vital bus circuits, as described in Section F1.2 - PWR Portable Equipment Phase 2, have changed for MPS2. The primary and alternate strategies have been switched. The primary strategy is to deploy a 480VAC diesel generator (DG) from the BDB Storage Building to the location identified in OIP Figure 6. The generator will be used to power the "B" Battery Charger which in turn supplies power to the vital AC instrument panels VA20 and VA40. The 480VAC DG connection strategy is unchanged.
As an alternate re-powering method for instrumentation, the 120/240VAC portable DGs will be used to power vital AC instrument panels, VA20 and VA40. These DGs will be stored in the BDB Storage Building. Deployment locations are unchanged.
The kW rating of the 120/240VAC DGs, which are now the alternate re-powering strategy, has been increased such that a single DG can be used to re-power the 120VAC vital bus circuits. A second 120/240VAC DG of the same rating will be available as a full capacity backup. The connection strategy for the alternate re-powering supply is unchanged. OIP Figures 6 and 7 are not revised for the 120/240VAC DG strategy since the change to the figures would only reflect that the distribution panels are powered from one DG instead of two.
b) Changes to the timing of the RCS Injection strategy have been made. The details and descriptions provided in Section C.2 of the OIP for RCS injection are the same, including the time at which natural circulation capability is lost, i.e., approximately 32 hours3.703704e-4 days <br />0.00889 hours <br />5.291005e-5 weeks <br />1.2176e-5 months <br /> based on WCAP-17601 (Reference 5) and ETE-NAF-2012-0150 (Reference 9).
For conservatism and margin to account for uncertainty within the calculations and
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 3 of 14 unanticipated deployment issues, a time of 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> has been chosen which provides significant margin (by a factor of 2) prior to loss of natural circulation and the start of reflux boiling.
c) Details of the Phase 2 alternate strategy for RCS inventory control, as described in Section C.2 - PWR Portable Equipment Phase 2, have changed for MPS2. The BDB RCS Injection pump will continue to be the primary strategy to add water to the RCS during Phase 2, however, the back-up strategy has been revised and involves the use of an installed charging pump. As the alternate RCS injection strategy, the installed "B" or "C" charging pump will be used to add borated water from the Refueling Water Storage Tank (RWST) (primary water source) or the Boric Acid Storage tanks (alternate water source) to the RCS.
Use of an installed charging pump as the alternate RCS injection strategy to support the start of RCS injection at 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> creates a new time constraint. In order for the charging pump to be available as an alternate, the 480VAC power supply must also be available. When supplemental staff arrives after 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, the portable 480VAC generator will be deployed from the BDB Storage Building to provide power to vital 480VAC Bus 22F. The charging pumps will then be powered from Bus 22F to provide borated water to the RCS from either the primary or alternate water sources.
The primary water supply, RWST, is already described in OIP Section C.2. The alternate water source, for use with an installed charging pump, is the Boric Acid Storage tanks (BASTs). These tanks are 6,600 gallon, insulated, temperature-controlled, storage tanks that store boric acid with an approximately 2.5 to 3.5 weight percent concentration. The BASTs are safety-related, seismically designed and located in the missile protected Auxiliary Building.
d) Details of the alternate connection strategy for RCS injection, as described in Section C.2 - PWR Portable Equipment Phase 2, for use with the BDB RCS Injection pump have changed for MPS2. The discharge crosstie valve between the "A" charging pump and the "B" and "C" charging pumps, 2-CH-338, will no longer be used as the alternate connection for the BDB RCS Injection pump. The piping upstream of this original alternate connection has been determined to not be designed to withstand the discharge pressure of the BDB RCS Injection pump. Consequently, the alternate RCS injection connection will use the hydrostatic test connection in the charging header. A revised Figure 4 showing the new alternate RCS injection connection is attached.
e) The quantities of BDB equipment stated in the OIP Table 1, PWR Portable Equipment Phase 2, have changed. Per Footnote 1 to Table 1, the quantities were based on the assumption that two storage buildings would be available to store BDB equipment pending completion of the study to determine the details of the BDB Storage Building(s).
Open Item No. 4 has been completed and the decision to have one storage building is documented in Section 6 of this update. A revised Table 1 is attached.
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 4 of 14 5 Need for Relief/Relaxation and Basis for the Relief/Relaxation DNC expects to comply with the order implementation date and no relief/relaxation is required at this time.
6 Open Items from Overall Integrated Plan The following table provides a summary of the open items documented in Attachment 2B of the Overall Integrated Plan and the status of each item.
Overall Integrated Plan Open Item 01 # Description Status Verify response times listed in timeline and perform staffing Not started 1 assessment. Scheduled completion date: December, 2014 Preliminary analyses have been performed to determine the Complete.
time to steam generator (SG) overfill without operator action to (Reference 4) reduce Auxiliary Feedwater (AFW) flow, time to SG dryout without AFW flow, and time to depletion of the Condensate Storage Tank (CST). Final durations will be provided when the analyses are completed.
Analyses will be performed to develop fluid components Started.
3 performance requirements and confirm fluid hydraulic-related Scheduled completion strategy objectives can be met. date: September, 2013 A study is in progress to determine the design features, site Complete.
location(s), and number of equipment storage facilities. The A single 10,000 sq. ft.
final design for BDB equipment storage will be based on the Type 1 building will be guidance contained in NEI 12-06, Section 11.3, Equipment constructed at Storage. A supplement to this submittal will be provided with Millstone Power Station the results of the equipment storage study. for storage of BDB equipment. The building will be designed to meet the plant's design basis for 4 the Safe Shutdown Earthquake, high wind hazards, snow, ice and cold conditions, and located above the flood elevation from the most recent site flood analysis. The BDB Storage Building will be sited north of the bridge near the salt
-shed. This update
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 5 of 14 Overall Integrated Plan Open Item 01 # Description Status provides the supplemental information referred to in this open item.
FSGs will be developed in accordance with PWROG guidance. Started.
5 Existing procedures will be revised as necessary to implement Scheduled completion FSGs. date: September, 2014 EPRI guidance documents will be used to develop periodic Not started.
testing and preventative maintenance procedures for BDB Scheduled completion 6 equipment. Procedures will be developed to manage date: December, 2014 unavailability of equipment such that risk to mitigating strategy capability is minimized.
An overall program document will be developed to maintain the Started.
7 FLEX strategies and their bases, and provide configuration Scheduled completion control and change management for the FLEX Program. date: December, 2014 The Dominion Nuclear Training Program will be revised to Started.
assure personnel proficiency in the mitigation of BDB events is Scheduled completion 8 developed and maintained. These programs and controls will date: December, 2014 be developed and implemented in accordance with the Systematic Approach to Training (SAT).
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 6 of 14 Overall Intecirated Plan ODen Item 01 # Description Status Complete.
The CE Owners Group has issued generic guidelines to address plant response for post-loss of all AC power for Combustion Engineering plants.
Based on these guidelines, DNC will develop plant specific FSGs for MPS2 to Confirm consistency of the FLEX strategies with the PWROG address plant response 9 evaluation of post-loss of all AC power plant response for for post-loss of all AC Combustion Engineering plants. power. Specifically, depressurization of SGs to a plant specific value of either a target SG pressure to prevent Safety Injection Tank (SIT) nitrogen injection OR a minimum steam pressure to support continuous operation of the turbine driven (TD)
AFW pump will be specified.
(Reference 10)
Develop strategy for use of the BDB AFW Pump to provide SG Started.
injection in the unlikely event of loss of TDAFW pump due to Scheduled completion 10 hurricane related storm surge flooding of the Turbine Building. date is revised from December, 2013 to October, 2013 **
Plant modifications will be completed for permanent plant Started.
11 changes required for implementation of FLEX strategies. Scheduled completion date: See Milestone Schedule Complete the engineering evaluation of the tornado missile Started.
protection of main steam atmospheric dump valve (MS ADV) Scheduled completion 12 outlet lines. date: December, 2013
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 7 of 14 Overall Integrated Plan Open Item 01 # Description Status Complete.
TDAFW pump operation and 13 Complete the evaluation of TDAFW pump long term operation adequate AFW flow to with < 120 psig inlet steam pressure. the SGs at SG pressures < 120 psig has been confirmed.
(References 6 and 7)
The Phase 3 coping strategy to maintain containment integrity Started.
is under development. Methods to monitor and evaluate Scheduled completion 14 containment conditions and depressurize/cool containment, if date is revised from necessary, will be provided in a future update. December, 2013 to October, 2013 **
Analyses will be performed to develop electrical components Started.
15 performance requirements and confirm electrical loading- Scheduled completion related strategy objectives can be met. date: September, 2013 Started.
An evaluation of all BDB equipment fuel consumption and 16 required re-fill strategies will be developed. Scheduled completion date: June, 2014 A lighting study will be performed to validate the adequacy of Started.
17 supplemental lighting and the adequacy and practicality of Scheduled completion using portable lighting to perform FLEX strategy actions. date: June, 2014 A communications study will be performed in accordance with Started.
the statements made in response to Recommendation 9.3 of Scheduled completion 18 the 10 CFR 50.54(f) letter dated March 12, 2012 in DNC letter date: Consistent with S/N 12-208F dated October 29, 2012. ** Rec 9.3 implementation dates Details of the ventilation strategy are under development and Started.
will conform to the guidance given in NEI 12-06. The details of Scheduled completion 19 this strategy will be provided at a later date. date is revised from September, 2013 to October, 2013**
Preferred travel pathways will be determined using the Started.
20 guidance contained in NEI 12-06. The pathways will attempt to Scheduled completion avoid areas with trees, power lines, and other potential date: June, 2014 obstructions and will consider the potential for soil liquefaction.
Serial No. 12-161D Docket No. 50-336 Order EA-1 2-049 Attachment 1, Page 8 of 14 Overall Integrated Plan Open Item 01 # Description Status Not started.
Scheduled completion 21 The equipment listed in Table 1 will be procured. ** date is revised from December, 2013 to August, 2014 **
- Refer to Section 8 for an explanation of the change to this Open Item.
7 Potential Draft Safety Evaluation Impacts There are no potential impacts to the Draft Safety Evaluation identified at this time.
8 Supplemental Information This supplemental information provides details of changes identified in the status updates above and addresses the following topics: a) a revision to Open Item No. 10, b) a revision to Open Item No. 14, c) a revision to Open Item No. 18, d) a revision to Open Item No. 19, e) a revision to Open Item No. 21, f) a revision to Milestone Task 'Procure Equipment', and g) the addition of Milestone "Validation Walk-throughs or Demonstration of FLEX Strategies and Procedures."
a) MPS2, Open Item 10: The Open Item completion date is revised to October 2013 to be consistent with the revised completion date for the Milestone "Develop Strategies."
b) MPS2, Open Item 14: The Open Item completion date is revised to October 2013 to be consistent with the revised completion date for the Milestone "Develop Strategies."
c) MPS2, Open Item 18: The revision to the wording more accurately reflects the planned activities to determine and validate that adequate communications are available to implement FLEX strategies in all phases of the response to an ELAP/LUHS event. The revised Open Item 18 is as follows:
A comprehensive study of communication capabilities is being performed in accordance with the statements made in DNC letter S/N 12-205F dated October 29, 2012 in response to Recommendation 9.3 of the 10 CFR 50.54(f) letter dated March 12, 2012. The results of this study will identify the communication means available or needed to implement command and control of the FLEX strategies at Millstone Power Station. Validation of communications required to implement FLEX strategies will be performed as part of Open Item No. 1.
d) MPS2, Open Item 19: The Open Item completion date is revised to October, 2013.
Additional time is required to complete the ventilation calculations needed to finalize the MPS2 ventilation strategy.
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 9 of 14 e) MPS2, Open Item 21: The revision to the wording more accurately reflects the equipment that will be purchased and delivered to the site consistent with the Milestone schedule. The updated completion schedule accurately reflects the Milestone schedule.
The revised Open Item and revised completion schedule are as follows:
Open Item 21: The equipment listed in Table 1 will be received on site.
Completion Schedule: August 2014 f) Milestone Task 'Procure Equipment': The revision to the wording more accurately reflects the actual tasks as they occur in sequence. The revised milestone task is the successor to 'Purchase Equipment'. The revised Milestone Task is as follows:
Milestone Task: Receive Equipment g) Milestone Task 'Validation Walk-throughs or Demonstration of FLEX Strategies and Procedures': This milestone was added for consistency with template and industry formats. It corresponds to the activity previously identified in Open Item No. 1. The scheduled milestone date is the same as the open item completion date.
9 References The following references support the updates to the Overall Integrated Plan described in this enclosure.
- 1. "DNC's Overall Integrated Plan in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)," dated February 29, 2013.
- 2. NRC Order Number EA-12-049, "Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events," dated March 12, 2012.
Revision 0, dated August 2012.
- 4. DNC letter 12-161C, "Supplement to Overall Integrated Plan in Response to March 21, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis Events (Order Number EA-12-049)," dated April 30, 2013.
- 5. WCAP-17601, "Reactor Coolant System Response to the Extended Loss of AC Power Event for Westinghouse, Combustion Engineering and Babcock & Wilcox NSSS Designs", August 2012.
- 6. Calculation 13-024, "Turbine Driven Auxiliary Feedwater (TDAFW) Pump Delivered Flow at Reduced Steam Generator Pressure," April 22, 2013.
- 7. Engineering Technical Evaluation ETE-MP-2013-1034, "MP2 Turbine Driven Aux Feedwater Pump Minimum Continuous Operating Speed," dated March 12, 2013.
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 10 of 14
- 8. Engineering Technical Evaluation, ETE-CPR-2012-0009, "Beyond Design Basis - FLEX Strategy Overall Integrated Plan Basis Document," Revision 1, August 2013.
- 9. Engineering Technical Evaluation, ETE-NAF-2012-0150, "Evaluation of Core Cooling Coping for Extended Loss of AC Power (ELAP) and Proposed Input for Dominion's Response to NRC Order EA-12-049 for Dominion Fleet," Revision 0.
- 10. PWROG letter, OG-1 3-197, Transmittal of PA-PSC-0965 Final CE-NSSS Specific ELAP Response (FLEX) Guidelines, May 17, 2013.
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 11 of 14 Table 1 - PWR Portable Equipment Phase 21 [Open Item 21]
Use and (potential/ flexibility) diverse uses Performance Maintenance Criteria _____ ___
Maintenance I Containment Preventive List portable equipment2 Core SFP Instrumentation Accessibility
[Open Item 14] Maintenance requirements BDB High Capacity pump (2) 1200 gpm 4 Will follow EPRI and associated hoses and X X X template fittings requirements BDB AFW pump (3) and 300 gpm 4 Will follow EPRI associated hoses and fittings 8 X template requirements BDB RCS Injection pump (2) 40 gpm4 Will follow EPRI and associated hoses and X template fittings requirements 120 VAC generators (4) and Will follow EPRI associated cables, 15 kW5 template connectors and switchgear requirements (to re-power Instrumentation) 120 VAC generators (4) and associated cables, Will follow EPRI connectors and switchgear X 10 kW5 template (to provide support requirements equipment) 3
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 12 6f 14 Table 1 - PWR Portable Equipment Phase 21 [Open Item 21]
Use and (potential/ flexibility) diverse uses Performance Maintenance
___Criteria ___ ____ ___ ____
Maintenance /
Containment Preventive List portable equipment2 Core SFP Instrumentation Accessibility
[Open Item 14] Maintenance requirements 480 VAC generators (3) and associated cables, connectors and switchgear Will follow EPRI (re-power battery chargers, X X X 300-350 kW5 template inverters, vital buses, MPS2 requirements Charging Pump, and MPS3 CAR Fans) 6 Cables for 4160 VAC generator connections (4 X X X X Sets)
Portable boric acid batching X tanks (2)
Light plants (4) 3 X Front end loader (2) 3 X Tow vehicles - tractors (2)3 X Hose trailer or utility vehicle (2)3 X Fans / blowers/heaters (2 X
sets) 3 Air compressors (2) 3 X
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 13 6f 14 Table 1 - PWR Portable Equipment Phase 21 [Open Item 21]
Use and (potential/ flexibility) diverse uses Performance Maintenance Criteria _______
Maintenance /
Containment Preventive List portable equipmene Core SFP Instrumentation Accessibility
[Open Item 14] Maintenance requirements Fuel cart with pump 3 X Communications Equipment 3,7 X Misc. debris removal equip.
X (1 set) 3 Misc. Support Equipment (2 sets) 3 X Notes:
- 1. This table is based on one BDB Storage Building.
- 2. Indicated quantities are station totals for both MPS2 and MPS3.
- 3. Support equipment. Not required to meet N+1.
- 4. Preliminary performance criteria. Final performance criteria will be determined by the hydraulic analysis performed in accordance with the design process. [Open Item 3]
- 5. Preliminary performance criteria. Final performance criteria will be determined by the electrical loading analysis performed in accordance with the design process. [Open Item 15]
- 6. 480 VAC generators are the alternate strategy to the 120/240 VAC generators at MPS3 and the primary strategy at MPS2.
Therefore, N+1 are required.
- 7. Equipment purchase in response to the results of Recommendation 9.3 of the 10 CFR 50.54(f) letter dated March 12, 2012.
Serial No. 12-161D Docket No. 50-336 Order EA-12-049 Attachment 1, Page 14 of 14 LEGENO.
- DOMESTIC WATER C D BOB MOOIFICATION
- FIRE LINE
-LONG ISLNOD SOUNO FIGURE 4 (AUGUST 2013 UPDATE)
RCS MAKEUP - MECHANICAL CONNECTIONS MILLSTONE UNIT 2
Serial No. 12-161D Docket No. 50-423 Order EA-12-049 Attachment 2 Six Month Status Report for the Implementation of Order EA-1 2-049, Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events Millstone Power Station Unit 3 Dominion Nuclear Connecticut, Inc. (DNC)
Serial No. 12-161D Docket No. 50-423 Order EA-12-049 Attachment 2, Page 1 of 15 Six Month Status Report for the Implementation of Order EA-12-049, Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events 1 Introduction Dominion Nuclear Connecticut (DNC) developed an Overall Integrated Plan (OIP) (Reference 1), documenting the diverse and flexible strategies (FLEX) for Millstone Power Station Unit 3 (MPS3), in response to NRC Order Number EA-12-049 (Reference 2). This attachment provides an update of milestone accomplishments and open items since submittal of the OIP, including any changes to the compliance method, schedule, or need for relief/relaxation and the basis, if any.
2 Milestone Accomplishments The following milestone has been completed since the development of the OIP, and is current as of July 31, 2013.
0 Submit Integrated Plan 3 Milestone Schedule Status The following table provides an update to Attachment 2A of the OIP. It provides the activity status of each item, and whether the expected completion date has changed. The dates are planning dates subject to change as design and implementation details are developed.
The revised milestone target completion date for 'Develop Strategies' does not impact the Order implementation date.
Target Revised Target Milestone Completion Activity Completion Date Date Submit Integrated Plan Feb 2013 Complete Develop Strategies July 2013 Started October 2013 Develop Modifications Feb 2014 Started Implement Modifications Oct 2014 Started Develop Training Plan Apr 2014 Started Implement Training Sept 2014 Not Started Issue FSGs and Associated Oct 2014 Not Started Procedure Revisions Develop Strategies / Contract with Apr 2014 Started RRC Purchase Equipment Feb 2014 Started
Serial No. 12-161D Docket No. 50-423 Order EA-12-049 Attachment 2, Page 2 of 15 Target Activity Revised Target Milestone Completion Status Completion Date Date Procure Equipment
- Aug 2014 Not Started Validation Walk-throughs or Demonstrations of FLEX Strategies June 2014 Not Started and Procedures*
Create Maintenance Procedures Aug 2014 Not Started Outage Implementation Oct 2014 Not Started
- Refer to Section 8 for an explanation of the change to this Milestone.
4 Changes to Compliance Method By letter dated February 28, 2013, Serial No.12-161 B, DNC provided an Overall Integrated Plan (OIP) to address Beyond-Design-Basis (BDB) events at MPS2 and MPS3 as required by Order Number EA-12-049, dated March 12, 2012. The following are changes to the compliance method for MPS3 that meet NEI 12-06 (Reference 3), but are changes to the information provided in the OIP:
a) Details of the strategy for the portable diesel generators (DGs) used to re-power the 120VAC vital bus circuits, as described in Section F1.2 - PWR Portable Equipment Phase 2, have changed for MPS3. The overall re-powering strategy has not changed, however, the storage and connection plans for the DGs have been revised to enhance the ease of implementation and timing of the strategy. Two 120/240VAC diesel generators (DGs) will be pre-staged in separate areas of an existing protected MPS3 building (identified as building 322 on OIP Figure 6). The DGs do not require transport to be placed in service. The previously submitted deployment positions for the 120/240VAC DG shown on OIP Figure 6 are no longer correct. Additionally, the kW rating for each of the 120/240VAC DGs have been increased such that either of the pre-staged DGs can be used to re-power the 120VAC vital bus circuits. The second DG is a full capacity backup.
The connection strategy is changed in that permanently installed cables from receptacles located by the 120/240VAC DGs in Building 322 will be run to receptacles located in Switchgear Room "A." Additionally, receptacles will be permanently connected to the vital bus panels VIAC1 and VIAC3. Therefore, the connections between the DG and the nearby receptacles and between the Switchgear Room receptacles and the vital bus panels are made with plug-in "jumper cables". This configuration is shown on the revised OIP Figures 6 and 7 which are attached.
b) With the changes to the 120/240VAC re-powering strategy above, the deployment strategy for the 480VAC DG has changed. The 480VAC DG, which is the alternate approach to re-power the 120VAC vital buses, will no longer be pre-staged. It will be stored in the BDB Storage Building and transported to its deployment location shown in
Serial No. 12-161D Docket No. 50-423 Order EA-12-049 Attachment 2, Page 3 of 15 Figure 6, when needed. The revised battery life estimate for MPS3 has determined that there is adequate time to transport the 480VAC DG as an alternate for the 120/240VAC DGs (See Open Item No. 2). The 480VAC DG will be connected directly to Bus 32T via an installed spare breaker cubicle. A revised OIP Figure 8 showing the 480VAC connection is attached.
c) Changes to the timing of the RCS Injection strategy have been made. The details and descriptions provided in Section C.2 of the OIP for RCS injection are the same, including the time at which natural circulation capability is lost, i.e., approximately 33 hours3.819444e-4 days <br />0.00917 hours <br />5.456349e-5 weeks <br />1.25565e-5 months <br /> based on WCAP-17601 (Reference 6) and ETE-NAF-2012-0150 (Reference 10).
For conservatism and margin to account for uncertainty within the calculations and unanticipated deployment issues, a time of 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> has been chosen which provides significant margin (by a factor of 2) prior to loss of natural circulation and the start of reflux boiling.
d) The quantities of BDB equipment stated in the OIP Table 1, PWR Portable Equipment Phase 2, have changed. Per Footnote 1 to Table 1, the quantities were based on the assumption that two storage buildings would be available to store BDB equipment pending completion of the study to determine the details of the BDB Storage Building(s).
Open Item No. 6 has been completed and the decision to have one storage building is documented in Section 6 of this update. A revised Table 1 is attached.
5 Need for Relief/Relaxation and Basis for the Relief/Relaxation DNC expects to comply with the Order implementation date and no relief/relaxation is required at this time.
6 Open Items from Overall Integrated Plan The following table provides a summary of the open items documented in Attachment 2B of the OIP and the status of each item.
Overall Integrated Plan Open Item 01 # Description Status Verify response times listed in timeline and perform Not started.
staffing assessment. Scheduled completion date:
June, 2014 Complete.
In our February 28, 2013 OIP submittal for Millstone, the Evaluation of extended battery life with load stripping of MPS3 Class 1 E 125V battery 2 all non-essential loads, life was "estimated" at between 2 and 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> assuming that load stripping would commence within 45 minutes and be completed
Serial No. 12-161D Docket No. 50-423 Order EA-12-049 Attachment 2, Page 4 of 15 Overall Inteqrated Plan Open Item OI # Description I Status within the following 30 minutes. The pending final evaluation of the extended Class 1E station emergency battery life was identified as Open Item No. 2. The calculation with the stated load stripping assumption has been completed. The evaluated time to battery depletion is 14.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />. The evaluation considered that the 301 B battery was stripped of all loads by the assumed time frame and that the 301A battery would carry the necessary instrumentation loads until it reached the minimum voltage for reliable instrument readings in 7.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. At that time, alternate instrument loads for plant monitoring from the 301B battery would be re-connected and would be available for an additional 6.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />. The combined time available by this approach (14.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />) is sufficient for the implementation of the re-powering strategy for the 120VAC systems as outlined in the OIP submittal, Section F1.2.
(Reference 5)
Preliminary analyses have been performed to determine Complete.
the time to steam generator (SG) overfill without operator (Reference 4) action to reduce auxiliary feedwater (AFW) flow, time to 3 SG dryout without AFW flow, and time to depletion of the useable volume of the demineralized water storage tank (DWST). The final durations will be provided when the analyses are completed.
Serial No. 12-161D Docket No. 50-423 Order EA-12-049 Attachment 2, Page 5 of 15 Overall Integrated Plan Open Item 01 # Description Status The Phase 3 coping strategy to maintain containment Started.
integrity is under development. Methods to monitor and Scheduled completion date is 4 evaluate containment conditions and depressurize/cool revised from December, 2013 containment, if necessary, will be provided in a future to October, 2013 **
update.
Analyses will be performed to develop fluid components Started.
5 performance requirements and confirm fluid hydraulic- Scheduled completion date:
related strategy objectives can be met. September, 2013 A study is in progress to determine the design features, Complete.
site location(s), and number of BDB Storage Building(s). A single 10,000 sq. ft. Type 1 The final design for BDB Storage Building(s) will be building will be constructed at based on the guidance contained in NEI 12-06, Section Millstone Power Station for 11.3, Equipment Storage. A supplement to this storage of BDB equipment.
submittal will be provided with the results of the The building will be designed equipment storage study. to meet the plant's design basis for the Safe Shutdown Earthquake, high wind 6 hazards, snow, ice and cold conditions, and located above the flood elevation from the most recent site flood analysis. The BDB Storage Building will be sited north of the bridge near the salt shed.
This update provides the supplemental information referred to in this open item.
FLEX Support Guidelines (FSGs) will be developed in Started.
7 accordance with PWROG guidance. Existing procedures Scheduled completion date:
will be revised as necessary to implement FSGs. October, 2014 EPRI guidance documents will be used to develop Not started.
periodic testing and preventative maintenance Scheduled completion date:
8 procedures for BDB equipment. Procedures will be September, 2014 developed to manage unavailability of equipment such that risk to mitigating strategy capability is minimized.
An overall program document will be developed to Started.
9 maintain the FLEX strategies and their bases, and Scheduled completion date:
provide configuration control and change management September, 2014 for the FLEX Program.
Serial No. 12-161D Docket No. 50-423 Order EA-12-049 Attachment 2, Page 6 of 15 Overall Intearated Plan ODen Item OI # Description Status The Dominion Nuclear Training Program will be revised Started.
to assure personnel proficiency in the mitigation of BDB Scheduled completion date:
10 events is developed and maintained. These programs September, 2014 and controls will be developed and implemented in accordance with the Systematic Approach to Training (SAT).
Complete the evaluation of turbine driven (TD)AFW Complete.
pump long term operation with < 290 psig inlet steam TDAFW pump operation and pressure. adequate AFW flow to the SGs at SG pressures < 290 psig has been confirmed.
(References 7 and 8)
Plant modifications will be completed for permanent Started.
12 plant changes required for implementation of FLEX See Milestone Schedule strategies.
Analyses will be performed to develop electrical Started.
13 components performance requirements and confirm Scheduled completion date:
electrical loading-related strategy objectives can be met. September, 2013 An evaluation of all BDB equipment fuel consumption Not started.
14 and required re-fill strategies will be developed. Scheduled completion date June, 2014 A lighting study will be performed to validate the Started.
15 adequacy of supplemental lighting and the adequacy Scheduled completion date:
and practicality of using portable lighting to perform June, 2014 FLEX strategy actions.
A comprehensive communications study will be Started.
performed in accordance with the statements made in Scheduled completion date:
16 response to Recommendation 9.3 of the 10 CFR Consistent with Rec 9.3 50.54(0 letter dated March 12, 2012 in DNC letter S/N implementation dates 12-205F dated October 29, 2012. **
Details of the ventilation strategy are under development Started.
17 conform to the guidance given in NEI 12-06. Scheduled completion date is The will and details of this strategy will be provided at a later revised from September, 2013 date. to October, 2013 **
Preferred travel pathways will be determined using the Not started.
guidance contained in NEI 12-06. The pathways will Scheduled completion date:
18 attempt to avoid areas with trees, power lines, and other June, 2014 potential obstructions and will consider the potential for soil liquefaction.
Serial No. 12-161D Docket No. 50-423 Order EA-12-049 Attachment 2, Page 7 of 15 Overall Inteclrated Plan Open Item 01 # Description Status The equipment listed in Table 1 will be procured. ** Not started.
19 Scheduled completion date is revised from June, 2014 to August, 2014**
- Refer to Section 8 for change to this Open Item.
7 Potential Draft Safety Evaluation Impacts There are no potential impacts to the Draft Safety Evaluation identified at this time.
8 Supplemental Information This supplemental information provides details of changes identified in the status updates above and addresses the following topics: a) Revision to Open Item No. 4, b) Revision to Open Item No. 16, c) Revision to Open Item No. 17, d) revision to Open Item No. 19, e) Milestone
'Procure Equipment', and f) the addition of Milestone "Validation Walk-throughs or Demonstration of FLEX Strategies and Procedures."
a) MPS3, Open Item 4: The Open Item completion date is revised to October 2013 to be consistent with the revised completion date for the Milestone "Develop Strategies."
b) MPS3, Open Item 16: The revision to the wording more accurately reflects the planned activities to determine and validate that adequate communications are available to implement FLEX strategies in all phases of the response to a BDB event. The revised Open Item 16 is as follows:
A comprehensive study of communication capabilities is being performed in accordance with the statements made in response to Recommendation 9.3 of the 10 CFR 50.54(f) letter dated March 12, 2012 in DNC letter S/N 12-205F dated October 29, 2012. The results of this study will identify the communication means available or needed to implement command and control of the FLEX strategies at Millstone Power Station. Validation of communications required to implement FLEX strategies will be performed as part of Open Item No. 1.
c) MPS3, Open Item 17: The Open Item completion date is revised to October, 2013.
Additional time is required to complete the ventilation calculations needed to finalize the MPS3 ventilation strategy.
d) MPS3, Open Item 19: The revision to the wording more accurately reflects the equipment that will be purchased and delivered to the site consistent with the Milestone schedule. The updated completion schedule accurately reflects the Milestone schedule. The revised Open Item and revised completion schedule are as follows:
Serial No. 12-161D Docket No. 50-423 Order EA-12-049 Attachment 2, Page 8 of 15 Open Item 19: The equipment listed in Table 1 will be received on site.
Completion Schedule: August 2014 e) Milestone 'Procure Equipment': The revision to the wording more accurately reflects the actual tasks as they occur in sequence. The revised milestone task is the successor to 'Purchase Equipment'. The revised Milestone Task is as follows:
Milestone Task: Receive Equipment f) Milestone 'Validation Walk-throuqhs or Demonstration of FLEX Strategies and Procedures': This milestone was added for consistency with template and industry formats. It corresponds to the activity previously identified in Open Item No. 1. The scheduled milestone date is the same as the open item completion date. By this date, sufficient FLEX equipment will be available to perform the walk-throughs and procedures will be in a near final form and will rely on the walk-throughs for validation prior to final issuance.
9 References The following references support the updates to the Overall Integrated Plan described in this attachment.
- 1. "DNC's Overall Integrated Plan in Response to March 12, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (Order Number EA-12-049)," dated February 29, 2013.
- 2. NRC Order Number EA-12-049, "Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events,"
dated March 12, 2012.
Revision 0, dated August 2012.
- 4. DNC letter 12-161C, "Supplement to Overall Integrated Plan in Response to March 21, 2012 Commission Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis Events (Order Number EA-12-049)," dated April 30, 2013.
- 5. Calculation 2013-ENG-04501E3, MP3 BDB Battery Calculation, Rev. 0 dated May 29, 2013.
- 6. WCAP-17601, "Reactor Coolant System Response to the Extended Loss of AC Power Event for Westinghouse, Combustion Engineering and Babcock & Wilcox NSSS Designs", August 2012.
- 7. Calculation 97-014, "MP3 AFW System, Determination of AFW Turbine/Pump Speed and AFW System Flow for Steam Generator Pressures of 185 psig, 600 psig, and 125 psig, and Determination of the Turbine Exhaust Pressure," April 2, 1997 through Change Notice No. 3 dated January 28, 2002.
Serial No. 12-161D Docket No. 50-423 Order EA-12-049 Attachment 2, Page 9 of 15
- 8. Engineering Technical Evaluation ETE-MP-2013-1037, "MP3 Turbine Driven Aux Feedwater Pump Minimum Continuous Operating Speed," dated March 12, 2013.
- 9. Engineering Technical Evaluation, ETE-CPR-2012-0008, "Beyond Design Basis - FLEX Strategy Overall Integrated Plan Basis Document," Revision 1, August 2013.
- 10. Engineering Technical Evaluation, ETE-NAF-2012-0150, "Evaluation of Core Cooling Coping for Extended Loss of AC Power (ELAP) and Proposed Input for Dominion's Response to NRC Order EA-12-049 for Dominion Fleet," Revision 0.
Serial No. 12-161D Docket Nos. 50-423 Order EA-12-049 Attachment 2, Page 10 of 15" Table 1 - PWR Portable Equipment Phase 21 [Open Item 19]
Use and (potential/ flexibility) diverse uses Performance Maintenance Criteria _________
Maintenance/
Containment Preventive List portable equipment2 Core [opent SFP Instrumentation Accessibility Mavnte
[Open Item 4] Maintenance requirements BDB High Capacity pump (2) 1200 gpm 4 Will follow EPRI and associated hoses and X X X template fittings requirements BDB AFW pump (3) and 300 gpm 4 Will follow EPRI associated hoses and fittings 8 X template requirements BDB RCS Injection pump (2) 40 gpm 4 Will follow EPRI and associated hoses and X template fittings requirements 120 VAC generators (4) and associated cables, connectors 15 kW5 Will follow EPRI and switchgear (to re-power X template Instrumentation) requirements 120 VAC generators (4) and Will follow EPRI associated cables, connectors X 10kW5 template and switchgear (to provide requirements support equipment) 3 requirements
Serial No. 12-161D Docket Nos. 50-423 Order EA-12-049 Attachment 2, Page 11 of 15' Table 1 - PWR Portable Equipment Phase 21 [Open Item 19]
Use and (potential/ flexibility) diverse uses Performance Maintenance
____ ____ ____ ____ ____Criteria Maintenance/
Containment Preventive List portable equipment2 Core SFP Instrumentation Accessibility
[Open Item 4] Maintenance requirements 480 VAC generators (3) and associated cables, connectors and switchgear (re-power Will follow EPRI battery chargers, inverters, X X X 300-350 kW 5 template vital buses, MPS2 Charging requirements Pump, and MPS3 CAR Fans) 6 Cables for 4160 VAC generator connections (4 X X X X Sets)
Portable boric acid batching X tanks (2)
Light plants (4) 3 X Front end loader (2) 3 X Tow vehicles - tractors (2) 3 X Hose trailer or utility vehicle X
(2) 3 Fans / blowers/heaters (2 X
sets) 3 Air compressors (2) 3 X
Serial No. 12-161D Docket Nos. 50-423 Order EA-12-049 Attachment 2, Page 12 of 15" Table I - PWR Portable Equipment Phase 21 [Open Item 19]
Use and (potential/ flexibility) diverse uses Performance Maintenance
____ ____ ____ ____ ____Criteria Maintenance/
Containment Preventive List portable equipment 2 Core SFP Instrumentation Accessibility
[Open Item 4] Maintenance requirements Fuel cart with pump 3 X Communications Equipment 3,7 X Misc. debris removal equip. (1 set) 3 X Misc. Support Equipment (2 sets) 3 X Notes:
- 1. This table is based on one BDB Storage Building.
- 2. Indicated quantities are station totals for both MPS2 and MPS3.
- 3. Support equipment. Not required to meet N+1.
- 4. Preliminary performance criteria. Final performance criteria will be determined by the hydraulic analysis performed in accordance with the design process. [Open Item 5]
- 5. Preliminary performance criteria. Final performance criteria will be determined by the electrical loading analysis performed in accordance with the design process. [Open Item 13]
- 6. 480 VAC generators are the alternate strategy to the 120/240 VAC generators at MPS3 and the primary strategy at MPS2.
Therefore, N+1 are required.
- 7. Equipment purchase in response to the results of Recommendation 9.3 of the 10 CFR50.54(f) letter dated March 12, 2012.
Serial No. 12-161D Docket Nos. 50-423 Order EA-12-049 , Page 13 of 15
Serial No. 12-161D Docket Nos. 50-423 Order EA-12-049 Attachment 2, Page 14 of 15 120/240V DIESEL GENERATOR 1120/240V DIESEL GENERATOR "A" EDG (PRIMARY) (BACK-UP) "B" EDG ROOM I I I ROOM BKR IBKR
__r___-- PRIMARY_----. .
JUMPERS I R R ----- BACK-U]ýPý I-._______
_-JUMPERS. SEE .NOTE
/- CABLE ROUTED IN" ......
NEW CND & EXISTING DUCT LINE (TYP)
R R WEiTCEBXAD"A" SWITCHOEAR JUMPER (2) RECEPTACLES (TYP) ROOM 7
,-JUMPER CNDI & CNO R R 120V VITAL BUS DISTRIBUTION PANEL 120V VITAL BUS DISTRIBUTION PANEL VIAC-1 (PANEL I) SINGLE PHASE RED VIAC-3 (PANEL I1l) SINGLE PHASE BLUE 3VBAPNL-VB KEY: I NOTEs 3VBAPNL-VB3 BACKUP JUMPERS, WHEN REQUIRED WILL BE ROUTED ON THE BOB MODIFICATION FLOOR OF THE EDOROOMS AND ON THE GROUND BETWEEN EOG ROOMS, FIGURE 7 (AUGUST 2013 UPDATE) 120/240 VAC GENERATOR ELECTRICAL CONNECTIONS MILLSTONE UNIT 3
Serial No. 12-161D Docket Nos. 50-423 Order EA-12-049 Attachment 2, Page 15 of 15
- 4. 16KV BUS 134C3-2
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