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MONTHYEARML1106200032011-03-0303 March 2011 3/15/11 Notice of Forthcoming Meeting with Entergy Operations, Inc. to Discuss Arkansas Nuclear One, Unit 1 Planned License Amendment Request for Technical Specification Change Service Water System Related Support Features Project stage: Meeting ML1107504262011-03-15015 March 2011 Licensee Slides from 3/15/11 Pre-Sumittal Meeting SWS Room Cooling Required Action Project stage: Meeting ML1111009242011-04-29029 April 2011 Summary of 3/15/11 (P.M. Session) Meeting with Entergy Operations, Inc. to Discuss Arkansas Nuclear One, Unit 1 Planned License Amendment Request for Technical Specification Change Service Water System Related Support Features Project stage: Meeting 2011-03-03
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Category:Meeting Briefing Package/Handouts
MONTHYEARML24190A1452024-07-0808 July 2024 Public Meeting Slides for Arkansas Nuclear One 2023 Annual Assessment, Pope County Quorum Court ML23348A3572023-12-14014 December 2023 Application to Revise Technical Specifications to Use Online Monitoring Methodology Slides and Affidavit for Pre-Submittal Meeting ML23296A1002023-10-24024 October 2023 Entergy Presentation Slides for Pre-Submittal Meeting on 10/24/23, Mtc LAR ML22193A0262022-07-12012 July 2022 (ANO) RICT License Amendment Request TSTF-505 NRC Pre-Submittal Meeting Presentation - July 13, 2022 ML21351A0282021-12-16016 December 2021 Preliminary Information of ANO-1 1R17 (2002) Findings on CRDM Nozzle 56, and Presentation Slides for PT Exam of Nozzle 56 ML21348A1262021-12-14014 December 2021 RCP TS LAR Pre-Submittal Meeting Slides, December 16, 2021 ML21312A0342021-11-0909 November 2021 Combined Slides for November 9, 2021, Technology Inclusive Content of Application Project Public Meeting ML21309A0622021-11-0909 November 2021 NRC Slides for November 9, 2021, Technology Inclusive Content of Application Project Public Meeting ML21242A2792021-08-30030 August 2021 ANO Slides Presentation for 9-1-21 Public Meeting ML21200A1792021-07-31031 July 2021 Scale/Melcor Non-LWR Source Term Demonstration Project - High Temperature Gas-Cooled Reactor ML20344A0572020-12-10010 December 2020 Combined Industry and NRC Slides for the December 10, 2020, Public Meeting on Technology Inclusive Content of Application Project, Advanced Reactor Content of Application Project and Applicability of Regulations to Non-Light Water Reactors ML20315A1582020-11-17017 November 2020 Presentation Meeting Slides for the 11/17/20 Teleconference ML20269A3452020-09-28028 September 2020 Pre-submittal Meeting for Request for One-Time Exemption from 10 CFR Part 50, Appendix E, Biennial EP Exercise (Offsite) Due to COVID-19- Entergy Presentation Slides ML20255A0242020-09-11011 September 2020 (Ano), Pre-Submittal Meeting with NRC - Request to Extend Allowable Outage Time (AOT) for the Emergency Cooling Pond (ECP) ML20211L7052020-08-0404 August 2020 (ANO) Units 1 & 2, Pre-Submittal Slide Presentation for August 4, 2020 Public Meeting ML20114E2752020-04-29029 April 2020 (ANO) Carbon Fiber Reinforced Polymer (Cfrp) Relief Request Pre-Submittal Meeting with NRC - April 29, 2020 ML19136A2512019-06-13013 June 2019 Handout for the June 13, 2019 Pre-submittal Public Meeting for Planned License Amendment Request Regarding Fuel Handling Accident Analysis ML18176A1312018-06-21021 June 2018 Summary of Annual Assessment Meeting with Entergy Operations, Inc., Regarding 2017 Performance of Arkansas Nuclear One ML18107A3342018-04-10010 April 2018 Tech Spec 3.3.5.2a Change Pre-Submittal Meeting Presentation Slides ML18081A1922018-03-20020 March 2018 Presentation at the PRA Workshop ML17328A3652017-11-30030 November 2017 Workshop on Sharing Operating Experience from Rigging, Lifting and Load Handling Events - Temporary Overhead Crane Failure at Arkansas Nuclear One Presented to IAEA ML16109A3642016-04-18018 April 2016 Summary of Meeting to Discuss Supplemental Inspection Results and Annual Assessment Meeting with Entergy Operations Inc. Regarding 2015 Performance of Arkansas Nuclear One ML16015A0622016-01-20020 January 2016 Briefing Notes for 95003 Inspection at Arkansas Nuclear One ML15132A1752015-05-21021 May 2015 Summary of Annual Assessment Meeting with Entergy Operations Inc., Regarding ANO 2014 Performance ML14356A1852014-12-22022 December 2014 ANO2 Exit ML14329B2092014-11-25025 November 2014 Summary of Regulatory Conference to Discuss Safety Significance of Arkansas Nuclear One Flood Protection Deficiencies ML14259A5972014-09-16016 September 2014 Summary of Annual Performance Assessment Meeting for Arkansas Nuclear One Performance ML14169A0722014-06-19019 June 2014 Entergy Public Meeting Presentation Slides ML12332A1792012-11-26026 November 2012 Power Point Presentation by Entergy at the November 26, 2012 Meeting (TAC No. ME9706.) ML12306A2912012-11-0101 November 2012 Transmittal Email and WCAP-17128-NP, Revision 1, Flaw Evaluation of CE Design RCP Suction and Discharge Nozzle Dissimilar Metal Welds, Phase III Study, May 2010 ML12278A2552012-10-0909 October 2012 Licensee Slide Presentation, ANO-2 NFPA 805 Application, at the October 9, 2012, pre-submittal Meeting to Discuss the NFPA 805 Application ML12278A2532012-10-0909 October 2012 Licensee Handout, Design Input for Fire Risk Evaluation, at the 10/9/2012 Pre-submittal Meeting to Discuss the NFPA 805 Application ML12275A5492012-10-0101 October 2012 Summary of Meeting with Entergy Operations, Inc., to Discuss the Performance of the Subject Facilities, Recent Organizational Changes, and Current Regulatory Issues ML1218003412012-06-28028 June 2012 Handouts at the June 29, 2012 NFPA 805 Meeting at the Hq - Item #4 ML1218003192012-06-28028 June 2012 Handouts at the June 29, 2012 NFPA 805 Meeting at the Hq - Item #3 ML1218003122012-06-28028 June 2012 Handouts at the June 29, 2012 NFPA 805 Meeting at the Hq - Item #2, Table W-2 ANO-2 Fire Area Risk Summary ML1218003102012-06-28028 June 2012 Handouts at the June 29, 2012 NFPA 805 Meeting at the Hq - Item #1, Plant Modifications and Items to Be Completed ML1218003062012-06-28028 June 2012 Handouts at the June 29, 2012 NFPA 805 Meeting at the Hq - Power Point Slides ML12166A5602012-06-12012 June 2012 Licensee Presentation on June 12 & 13, 2012, Meeting License Amendment Request on NFPA 805 Adoption ML1202501112012-01-25025 January 2012 Licensee Slides Arkansas Nuclear One, Unit 1 - Steam Generators Tube to Tube Wear ML1126502692011-09-22022 September 2011 Licensee Handouts for 10/05/2011 Presubmittal Meeting ML1117906392011-06-28028 June 2011 Summary of Meeting with Entergy Operations Inc ML1110401532011-04-13013 April 2011 Licensee Slides from 4/13/11 Meeting with Entergy Operations, Inc., to Discuss Proposed National Fire Protection Programs Standards 805 License Amendment Submittal for Arkansas Nuclear One, Units 1 & 2 ML1107504262011-03-15015 March 2011 Licensee Slides from 3/15/11 Pre-Sumittal Meeting SWS Room Cooling Required Action ML1107504162011-03-15015 March 2011 Licensee Slides from 3/15/11 Meeting with Entergy Operations on Technical Specification Change - Testing of Idle RCS Cooling Loop ML1016705012010-06-17017 June 2010 Discussion of Screening Criteria - Arkansas Nuclear One (ANO) ML0935201272009-12-18018 December 2009 Nrc/Entergy Operations, Inc., Management Meeting ML0935005652009-12-15015 December 2009 NRC Handouts Current Status of Arkansas Nuclear One Unit Steam Generators, December 2009 ML0913104172009-05-11011 May 2009 Summary of Meeting with Entergy to Discuss Arkansas Nuclear One 2008 Performance ML0828000612008-10-0101 October 2008 Enclosure 3-Technical Papers 2 - Plant Application of Weld Onlay for Butt Weld Mitigation 2024-07-08
[Table view] Category:Slides and Viewgraphs
MONTHYEARML24190A1452024-07-0808 July 2024 Public Meeting Slides for Arkansas Nuclear One 2023 Annual Assessment, Pope County Quorum Court ML23348A3572023-12-14014 December 2023 Application to Revise Technical Specifications to Use Online Monitoring Methodology Slides and Affidavit for Pre-Submittal Meeting ML23296A1002023-10-24024 October 2023 Entergy Presentation Slides for Pre-Submittal Meeting on 10/24/23, Mtc LAR ML23223A2032023-08-11011 August 2023 (ANO) Unit 1 Licensee'S Slide Presentation for 8/15/23 Public Meeting Pressurizer Heaters ML22193A0262022-07-12012 July 2022 (ANO) RICT License Amendment Request TSTF-505 NRC Pre-Submittal Meeting Presentation - July 13, 2022 ML22164A8012022-06-13013 June 2022 Entergy Fleet (GGNS, RBS, and WF-3) - Code Case N-752 RR 6-14-22 Pre-Submittal Public Meeting Presentation Slides ML22124A0692022-05-10010 May 2022 RVCH Penetration No. 1 Relief Request Public Meeting May 10, 2022 (EPID L-2022-LRM-0036) (Slides) ML21351A0282021-12-16016 December 2021 Preliminary Information of ANO-1 1R17 (2002) Findings on CRDM Nozzle 56, and Presentation Slides for PT Exam of Nozzle 56 ML21348A1262021-12-14014 December 2021 RCP TS LAR Pre-Submittal Meeting Slides, December 16, 2021 ML21319A2452021-11-15015 November 2021 Natrium Energy Island Decoupling Strategy - 11-17-2021 ML21306A3162021-11-0909 November 2021 Digital IC Presentation 11/09/2021 ML21309A0622021-11-0909 November 2021 NRC Slides for November 9, 2021, Technology Inclusive Content of Application Project Public Meeting ML21312A0342021-11-0909 November 2021 Combined Slides for November 9, 2021, Technology Inclusive Content of Application Project Public Meeting ML21200A1792021-07-31031 July 2021 Scale/Melcor Non-LWR Source Term Demonstration Project - High Temperature Gas-Cooled Reactor 0CAN062101, Presentation Information for Pre-Submittal Meeting Regarding the Response to Request for Additional Information - Proposed Alternative to ASME Section XI Requirements for Repair/Replacement of Emergency Cooling2021-06-15015 June 2021 Presentation Information for Pre-Submittal Meeting Regarding the Response to Request for Additional Information - Proposed Alternative to ASME Section XI Requirements for Repair/Replacement of Emergency Cooling ML21095A2122021-04-0808 April 2021 Pre-Submittal Meeting - ANO-1 LAR Related to RCS Primary Activity and Primary-to-Secondary Leak Rate ML20344A0572020-12-10010 December 2020 Combined Industry and NRC Slides for the December 10, 2020, Public Meeting on Technology Inclusive Content of Application Project, Advanced Reactor Content of Application Project and Applicability of Regulations to Non-Light Water Reactors ML20315A1582020-11-17017 November 2020 Presentation Meeting Slides for the 11/17/20 Teleconference ML20269A3452020-09-28028 September 2020 Pre-submittal Meeting for Request for One-Time Exemption from 10 CFR Part 50, Appendix E, Biennial EP Exercise (Offsite) Due to COVID-19- Entergy Presentation Slides ML20255A0242020-09-11011 September 2020 (Ano), Pre-Submittal Meeting with NRC - Request to Extend Allowable Outage Time (AOT) for the Emergency Cooling Pond (ECP) ML20211L7052020-08-0404 August 2020 (ANO) Units 1 & 2, Pre-Submittal Slide Presentation for August 4, 2020 Public Meeting ML20114E2752020-04-29029 April 2020 (ANO) Carbon Fiber Reinforced Polymer (Cfrp) Relief Request Pre-Submittal Meeting with NRC - April 29, 2020 ML18107A3342018-04-10010 April 2018 Tech Spec 3.3.5.2a Change Pre-Submittal Meeting Presentation Slides ML18075A1232018-03-20020 March 2018 Entergy Nuclear Operations - March 20, 2018, Presentation Slides for Surveillance Frequency Control Program, UFSAR Change Considerations ML18081A1922018-03-20020 March 2018 Presentation at the PRA Workshop ML17328A3652017-11-30030 November 2017 Workshop on Sharing Operating Experience from Rigging, Lifting and Load Handling Events - Temporary Overhead Crane Failure at Arkansas Nuclear One Presented to IAEA ML15132A1752015-05-21021 May 2015 Summary of Annual Assessment Meeting with Entergy Operations Inc., Regarding ANO 2014 Performance ML15014A0842015-01-14014 January 2015 NRC ANO Unit 1 Stator Drop SDP Evaluation ML14329B2092014-11-25025 November 2014 Summary of Regulatory Conference to Discuss Safety Significance of Arkansas Nuclear One Flood Protection Deficiencies ML14259A5972014-09-16016 September 2014 Summary of Annual Performance Assessment Meeting for Arkansas Nuclear One Performance ML14169A0722014-06-19019 June 2014 Entergy Public Meeting Presentation Slides ML13142A2272013-05-22022 May 2013 Summary of Public Meeting to Discuss Results of Augmented Inspection at Arkansas Nuclear One ML12332A1792012-11-26026 November 2012 Power Point Presentation by Entergy at the November 26, 2012 Meeting (TAC No. ME9706.) ML12275A5492012-10-0101 October 2012 Summary of Meeting with Entergy Operations, Inc., to Discuss the Performance of the Subject Facilities, Recent Organizational Changes, and Current Regulatory Issues ML1218003062012-06-28028 June 2012 Handouts at the June 29, 2012 NFPA 805 Meeting at the Hq - Power Point Slides ML1202501112012-01-25025 January 2012 Licensee Slides Arkansas Nuclear One, Unit 1 - Steam Generators Tube to Tube Wear ML1126502692011-09-22022 September 2011 Licensee Handouts for 10/05/2011 Presubmittal Meeting ML11221A3212011-08-0101 August 2011 521- R326C B&W Tech Cross Training - Chapter 17 ANO-1 Seal Failure ML1110401532011-04-13013 April 2011 Licensee Slides from 4/13/11 Meeting with Entergy Operations, Inc., to Discuss Proposed National Fire Protection Programs Standards 805 License Amendment Submittal for Arkansas Nuclear One, Units 1 & 2 ML1107504262011-03-15015 March 2011 Licensee Slides from 3/15/11 Pre-Sumittal Meeting SWS Room Cooling Required Action ML1107504162011-03-15015 March 2011 Licensee Slides from 3/15/11 Meeting with Entergy Operations on Technical Specification Change - Testing of Idle RCS Cooling Loop ML1016705012010-06-17017 June 2010 Discussion of Screening Criteria - Arkansas Nuclear One (ANO) ML0935201272009-12-18018 December 2009 Nrc/Entergy Operations, Inc., Management Meeting ML0913104172009-05-11011 May 2009 Summary of Meeting with Entergy to Discuss Arkansas Nuclear One 2008 Performance ML0831102062008-11-0606 November 2008 Summary of Meeting with Entergy to Discuss an Open Substantive Crosscutting Issue at Arkansas Nuclear One ML0828000612008-10-0101 October 2008 Enclosure 3-Technical Papers 2 - Plant Application of Weld Onlay for Butt Weld Mitigation ML0828300322008-08-31031 August 2008 NRC Presentation Arkansas Nuclear One - Unit One ML0814306742008-05-22022 May 2008 Summary of Annual Performance Assessment Meeting for Arkansas Nuclear One ML0718004262007-06-29029 June 2007 Summary of Arkansas Nuclear One End-Of-Cycle Public Meeting ML0627703242006-10-19019 October 2006 Draft Slide Presentation for Nrc/Entergy/Westinghouse Pre-Submittal Meeting (Non-Proprietary) 2024-07-08
[Table view] |
Text
SWS Room Cooling Required Action 1
SWS Room Cooling Required Action INTRODUCTION
- The ANO ANO--1 Technical Specifications (TSs) do not specifically address room cooling support features for TS-TS-supported equipment
- ANO-ANO-1 received a non non--cited violation for not entering supported equipment TSs when a single cooling subsystem was inoperable
- Lack of guidance in this matter results in conservatively entering TSs associated with the supported electrical equipment (8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> Completion Time).
2
SWS Room Cooling Required Action PURPOSE Determine or develop appropriate actions that will address time pperiods when a non--TS room cooling subsystem is non out--of out of--service considering its impact on TS--required equipment TS 3
SWS Room Cooling Required Action OUTLINE
- Function F ti off the th SService i WWater t S System t (SWS)
- Impact on Electrical Equipment
SWS Room Cooling Required Action REGULATORY HISTORY
- Following initial startup in the 1970s, a lack of an emergency cooling subsystem for ANO-ANO-1 electrical bus areas was identified
- Vital powered, non-non-Q VUC VUC--13A/B installed at ANO-ANO-1 in interim. Q-Q-emergency cooling subsystem installed soon thereafter consisting of Service Water (SW) cooled VCH--4A/B chillers and associated room VCH coolers VUC-VUC-14A/B/C/D and VUC-VUC-2B/D 5
SWS Room Cooling Required Action REGULATORY HISTORY
- ANO ANO--1 established proceduralized compensatory measures and analysis to support maintenance on one subsystem train while maintaining operability of TS--supported electrical equipment TS
- Compensatory measures included reliance on remaining SW train and chiller subsystem, reliance on non-non-Q vital powered VUC-VUC-13A/B, and/or convection cooling via compensatory measures 6
SWS Room Cooling Required Action REGULATORY HISTORY
- Recently, the validity of these evaluations and analysis had been challenged and ANO-1 received a non-ANO- non-cited violation for failing to enter supported system TSs when one cooling subsystem was inoperable 7
SWS Room Cooling Required Action CONFIGURATION ASSESSMENT
- Adequate cooling for both trains of electrical equipment can be provided through established compensatory measures, assuming either the remaining operable VCH--4A/B chiller or the vital powered non VCH non--Q VUC--13A/B coolers are available. However, VUC the non-non-Q VUC-VUC-13A/B coolers are not credited in the current analysis.
- Station risk verified to be acceptable when one room cooling subsystem train inoperable 8
SWS Room Cooling Required Action CONFIGURATION ASSESSMENT An evaluation of risk associated with one train of the emergency room cooling subsystem was performed over a 7- 7-day period and found to be acceptable acceptable.
- Incremental core damage probability (ICCDP) = 5.22E-5.22E-08
- Incremental conditional large early release probability conservatively taken as 5.22E-5.22E-09
- Sensitivity analysis of common cause failure modes results in ICCDP = 5.70E-5.70E-08
- External event ICCDP = 1.04E-1.04E-07 9
SWS Room Cooling Required Action CONFIGURATION ASSESSMENT
- ANO initiated action to determine what TSs, if any, should be applied when one room cooling subsystem was inoperable
- Based on industry input and that SW provides the ultimate support needed to cool the areas, ANO believes that the SW TS should be applied 10
SWS Room Cooling Required Action CONFIGURATION ASSESSMENT
- The SWS provides the ultimate cooling support function to a wide array of safety-safety-related and TS-TS-required equipment
- The 72-72-hour Completion Time provides a reasonable period to restore the support function for supported equipment not immediately challenged by a loss of a SWS loop and is based on the redundant capabilities afforded by the operable loop and systems, and the low probability of an accident during this period
- LCO 3.0.6 must also be entered to ensure a loss of safety function does not exist
- It is not unusual for support system restoration periods to be longer than the supported system (i.e., 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to restore inverters while the respective bus must be restored in 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />) 11
SWS Room Cooling Required Action FUNCTION OF THE SWS Major safety related components supported by the SWS include:
- DHR (Low (L Pressure P Injection)
I j ti ) Pump P Jacket J k t / Bearings B i Coolers C l
- Makeup (High Pressure Injection (HPI)) Pump Lube Oil Coolers
- Reactor Building Spray (RBS) Pump Jacket / Lube Oil Coolers
- Backup Supply to Emergency Feedwater (EFW) Pumps The SWS removes heat from rooms via the following subsystems:
- Makeup (HPI) Pump Room Coolers
- DHR (LPI) Pump Room Coolers (two coolers per train)
- Emergency Switchgear Room Chillers (discussed below) 12
SWS Room Cooling Required Action FUNCTION OF THE SWS The SWS does not mitigate accidents in and of itself, but is a support system The SWS supports the removal of post-post-accident residual heat from the reactor core and cooling the Reactor Building atmosphere Most SWS room cooling subsystems provide heat removal support for equipment located in a single room. However, switchgear room cooling involves several different rooms housing various TS-TS-required equipment 13
SWS Room Cooling Required Action NORMAL ROOM COOLING Available cooling sources: (see drawing)
- Normal Auxiliary Building ventilation VSF-VSF-7A/B, VEF--8A/B VEF
- Normal vital powered switchgear room coolers VUC--2A/C and non VUC non--Q cooler VSF VSF--10
- Vital powered, self self--contained coolers VUC-VUC-13A/B
- Self Self--contained cooler VUC-VUC-11
SWS Room Cooling Required Action Upper North Electrical Penetration Room El. 386 Normal Switchgear Room Cooling VUC14B B61 NOTES:
Pen Rm Exhaust
- 1. All areas approximate El. 368 and 149 VEF38A/B approximate scale unless otherwise AB Vent VSF7A stated.
- 2. VUC-11, VUC-13A, and VUC-13B are self-contained chilled water units. AB Vent VSF7B VUC-13A and VUC-13B are energized South Electrical from vital power.
Battery Charger Equipment Room 3. VUC-2A, VUC-2B, and VSF-10 require Room chilled water supply for cooling (ACW D01 D13 B52 supply) which is initially lost upon a ES VUC13A 104 C187 Actuation. VEF 33 D11 VUC B3 D03A D03B 109 14A C513 Y11 Y15 Y13 B51 D17 VUC C579 C186 Control Room 14C C511 Battery Room Chilled Water D15 D02 D06 Battery C539 Room 98 95 D07 110 D07 D16 VUC D14 D04A VEF34 14D B21 D06 D21 Corridor VUC-11 D04B VUC Y4 13B Battery Charger Y25 Room A3 Y26 A4 B63 Y24 VUC VUC VUC VUC 2A 100 2B 2C 99 2D Y28 VCH4A X5 B5 X6 B6 VCH4B Loop 2 SWS X6C 98 B57 Y3 B56 4160V/480V Switchgear Rooms Loop 1 SWS VSF10 15
SWS Room Cooling Required Action EMERGENCY ROOM COOLING Available cooling sources: (see drawing)
- Coolers VUC-VUC-14A/B/C/D and VUC-VUC-2B/D supplied by y SWS-SWS-cooled chillers VCH-VCH-4A/B
- Vital powered, self self--contained coolers VUC-VUC-13A/B should remain available
- TS-TS-required Penetration Room ventilation VEF--38A/B (forced air exhaust only)
VEF
- Vital powered room exhaust fans should remain available 16
SWS Room Cooling Required Action Upper North Electrical Penetration Room El. 386 Emergency Switchgear Room Cooling VUC14B B61 NOTES:
Pen Rm Exhaust
- 1. All areas approximate El. 368 and 149 VEF38A/B approximate scale unless otherwise AB Vent VSF7A stated.
- 2. VUC-11, VUC-13A, and VUC-13B are self-contained chilled water units. AB Vent VSF7B VUC-13A and VUC-13B are energized South Electrical from vital power.
Battery Charger Equipment Room 3. VUC-2A, VUC-2B, and VSF-10 require Room chilled water supply for cooling (ACW D01 D13 B52 supply) which is initially lost upon a ES VUC13A 104 C187 Actuation. VEF 33 D11 VUC B3 D03A D03B 109 14A C513 Y11 Y15 Y13 B51 D17 VUC C579 C186 Control Room 14C C511 Battery Room Chilled Water D15 D02 D06 Battery C539 Room 98 95 D07 110 D07 D16 VUC D14 D04A VEF34 14D B21 D06 D21 Corridor VUC-11 D04B VUC Y4 13B Battery Charger Y25 Room A3 Y26 A4 B63 Y24 VUC VUC VUC VUC 2A 100 2B 2C 99 2D Y28 VCH4A X5 B5 X6 B6 VCH4B Loop 2 SWS X6C 98 B57 Y3 B56 4160V/480V Switchgear Rooms Loop 1 SWS VSF10 17
SWS Room Cooling Required Action IMPACT TO ELECTRICAL EQUIPMENT Current procedural guidance requires implementation of compensatory measures to limit equipment impact when one train of the cooling li subsystem b t is i inoperable.
i bl Actions A ti have h
been evaluated against resources and timing, and found to be acceptable.
- Pre-Pre-determined doors are opened to enhance convection cooling
- Unnecessary loads are reduced
- Other ventilation (Q & non-non-Q) is verified in operation or available
SWS Room Cooling Required Action IMPACT TO ELECTRICAL EQUIPMENT No impact to equipment during normal operations.
Limited Li it d impact i t post-postt-accident:
id t
- No vital battery or inverter impact during the respective 2-2-hour post post--accident mission time
- Analysis currently underway to determine impact on associated rooms with no chillers available crediting convection cooling only using refined techniques 19
SWS Room Cooling Required Action IMPACT TO ELECTRICAL EQUIPMENT Cooling sources expected to be available post- post-accident assuming one train of the emergency room cooling subsystem previously out of service and offsite power is lost:lost:
- Coolers VUC-VUC-14A/B and VUC-VUC-2D supplied by SWS-SWS-VCH-4A OR Coolers VUC-cooled chiller VCH- VUC-14C/D and VUC--2B supplied by SWS-VUC SWS-cooled chiller VCH-VCH-4B.
- Vital powered, self self--contained coolers VUC-VUC-13A/B
- Various room exhaust fans should remain available
- Convection cooling via compensatory measures 20
SWS Room Cooling Required Action IMPACT TO ELECTRICAL EQUIPMENT If offsite power remains available, additional cooling and ventilation sources are expected to be available post--accident assuming one train of the emergency post room cooling subsystem was previously out of service:
- requires Auxiliary Cooling Water to be restored if more than forced air is needed
- Auxiliary Building supply/exhaust *VSF *VSF--7A/B, VEF VEF--8A/B
- Normal vital powered switchgear room coolers
- VUC non-vital/non-vital/non-Q cooler *VSF *VSF--10
- Self Self--contained cooler VUC-VUC-11 21
SWS Room Cooling Required Action PROPOSED OPTIONS The following options are under consideration by ANO:
- Using Part 9900 guidance, further evaluate the effects of a loss of both emergency room cooling subsystem trains (unlikely to validate design temperature limits not exceeded in all rooms under all ambient conditions)
- Enter into existing SWS TS when one train of the SWS emergency room cooling subsystem is out of service.
- Develop new separate TS for these subsystems (this would be a significant deviation from Standard TSs)
- Add action to SW TS (see next page) 22
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SWS Room Cooling Required Action PROPOSED OPTIONS A. One SWS loop A.1 -----------------------------------NOTES--------------------------------
inoperable for 1. Enter applicable Conditions and Required Actions reasons other than of LCO 3.8.1, "AC Sources - Operating, for diesel Condition B. generator made inoperable by SWS.
- 2. Enter Applicable Conditions and Required Actions of LCO 3.4.6, "RCS Loops - MODE 4," for decay heat removal made inoperable by SWS
Restore SWS loop to OPERABLE status. 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> B. Required SWS room/ B.1 Restore required SWS room/area cooling 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> area cooling subsystem(s) to OPERABLE status.
subsystem(s) associated with a single SWS loop inoperable.
C. Required Actions C.1 Be in Mode 3. 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and associated AND Completion Times not met. C.2 Be in Mode 5. 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />
SWS Room Cooling Required Action CONCLUSION ANO proposes entry into SWS TS Condition A in its current form. The SWS TS addresses the room cooling function of required room coolers. The SWS LCO provides reasonable actions consideringg the impact p of the potential p conditions.
LBDs and procedures would be revised accordingly in accordance with 10 CFR 50.59.
If necessary, ANO can propose a change to the SWS TS specifying a Required Action for the room cooling function of required room coolers. Prompt review of the change would be desired to avoid the potential for unnecessary plant maneuvering resulting from current interpretations, or a request for a Notice of Enforcement Discretion.
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OPEN DISCUSSION 25