|
|
| (2 intermediate revisions by the same user not shown) |
| Line 2: |
Line 2: |
| | number = ML091761047 | | | number = ML091761047 |
| | issue date = 08/05/2009 | | | issue date = 08/05/2009 |
| | title = 06/24/2009 North Anna Power Station ECCS Preacs Filtration Presentation | | | title = ECCS Preacs Filtration Presentation |
| | author name = | | | author name = |
| | author affiliation = Dominion, Virginia Electric & Power Co (VEPCO) | | | author affiliation = Dominion, Virginia Electric & Power Co (VEPCO) |
| Line 15: |
Line 15: |
|
| |
|
| =Text= | | =Text= |
| {{#Wiki_filter:North Anna Power Station North Anna Power StationECCS PREACS FiltrationECCS PREACS FiltrationJune 24, 2009 June 24, 2009One White Flint NorthOne White Flint North ECCS PREACSECCS PREACSPurpose of Technical Specification changes: Purpose of Technical Specification changes: 1) Specifically address the filtration function of the ECCS | | {{#Wiki_filter:North Anna Power Station ECCS PREACS Filtration June 24, 2009 One White Flint North |
| : 1) Specifically address the filtration function of the ECCS Pump Room Exhaust Air Cleanup System Pump Room Exhaust Air Cleanup System 2)RilTSiththitddidlii 2)RilTSiththitddidlii
| |
| : 2) R econc il e TS w ith th e assoc i a t e d d es i gn an d li cens i ng 2) R econc il e TS w ith th e assoc i a t e d d es i gn an d li cens i ng basis assumptionsbasis assumptions
| |
| ..
| |
| ECCS PREACSECCS PREACSNRC concerns from 2/19/09 teleconference :
| |
| NRC concerns from 2/19/09 teleconference :Sufficient justification for the proposed completion time for Sufficient justification for the proposed completion time for one train of ECCS PREACS inoperable one train of ECCS PREACS inoperable ReferencetoUFSARFigure154 ReferencetoUFSARFigure154
| |
| -
| |
| -110 110 Reference to UFSAR Figure 15.4Reference to UFSAR Figure 15.4-
| |
| -110 110 Description of the surveillance requirements that will assure Description of the surveillance requirements that will assure ECCS leakage does not exceed the unfiltered leakage limitECCS leakage does not exceed the unfiltered leakage limit ECCS PREACSECCS PREACSChanges will add actions to determine if filtration is required:Changes will add actions to determine if filtration is required:New Condition B
| |
|
| |
|
| New Condition B --One train inoperable due to filtration One train inoperable due to filtration capability capability NewConditionC NewConditionC
| | ECCS PREACS Purpose of Technical Specification changes: |
| -
| | : 1) Specifically address the filtration function of the ECCS Pump Room Exhaust Air Cleanup System |
| -Twotrainsinoperableduetofiltration Twotrainsinoperableduetofiltration New Condition C New Condition C Two trains inoperable due to filtration Two trains inoperable due to filtration capability capabilityModified Condition D Modified Condition D --Two trains inoperable due to ECCS Two trains inoperable due to ECCS pump room boundarypump room boundary ECCS PREACS ECCS PREACS Emergency Core Cooling Sy stem Pumps are located:
| | : 2) Reconcile R il TS with ith the th associated i t d design d i andd licensing li i basis assumptions. |
| Emergency Core Cooling Sy stem Pumps are located:
| |
| Within Auxiliary Building, Charging Pump cubicles Within Auxiliary Building, Charging Pump cubicles HighHeadSafetyInjection(charging)pumps HighHeadSafetyInjection(charging)pumps High Head Safety Injection (charging) pumps High Head Safety Injection (charging) pumps Within Safeguards Building of each unit Within Safeguards Building of each unitOutside Recirc Spray pumps Outside Recirc Spray pumpsLow Head Safety Injection pumps Low Head Safety Injection pumps ECCS PREACSECCS PREACSSystem Design is Unique.
| |
| System Design is Unique.The system is made up of three subsystems, which The system is made up of three subsystems, which operate both during normal operations and during operate both during normal operations and during accidentconditions: | |
| accidentconditions:
| |
| accident conditions:
| |
| accident conditions:
| |
| Unit 1 Safeguards Building Exhaust Unit 1 Safeguards Building ExhaustUnit 2 Safeguards Building Exhaust Unit 2 Safeguards Building ExhaustAuxiliary Building Central Exhaust (shared between Auxiliary Building Central Exhaust (shared between units)units)
| |
| ECCS PREACS ECCS PREACS System is once
| |
|
| |
|
| System is once--through exhaust through exhaust--only ventilation only ventilationMaintains negative pressure in pump rooms Maintains negative pressure in pump roomsPUMP ROOMNegative pressure ensures air flows inward ECCS PREACSECCS PREACSECCS PREACS is interconnected with other ECCS PREACS is interconnected with other subsystems which are shutdown during accident subsystems which are shutdown during accident conditions. | | ECCS PREACS NRC concerns from 2/19/09 teleconference : |
| conditions.Each subsystem can be diverted through common Each subsystem can be diverted through common filter banks filter banksEach subsystem has two or three exhaust fansEach subsystem has two or three exhaust fans 2-HV-F-40A/B 1-HV-F-40A/B 1-HV-F-8A/B/CPREACS normal lineupPREACS normal lineup Vent Stack B Vent Stack A U2 SFGDS U1 SFGDS Aux Bldg CentralRef: 11715-FB-006A, sh. 3 2-HV-F-40A/B 1-HV-F-40A/B 1-HV-F-8A/B/CPREACS accident lineupPREACS accident lineup U2 SFGDS U1 SFGDS AB Central ECCS PREACS ECCS PREACSSafeguards Area Ventilation subsystems (one for hUi)eac h U n i t)Auxiliary Building Central Exhaust
| | 3/4 Sufficient justification for the proposed completion time for one train of ECCS PREACS inoperable 3/4 Reference to UFSAR Figure 15.4- 15.4 15 4-4-110 3/4 Description of the surveillance requirements that will assure ECCS leakage does not exceed the unfiltered leakage limit |
| | |
| | ECCS PREACS Changes will add actions to determine if filtration is required: |
| | 3/4 New Condition B - One train inoperable due to filtration capability 3/4 New Condition C - Two trains inoperable due to filtration capability 3/4 Modified Condition D - Two trains inoperable due to ECCS pump room boundary |
| | |
| | ECCS PREACS Emergency Core Cooling System Pumps are located: |
| | 3/4 Within Auxiliary Building, Charging Pump cubicles High Head Safety Injection (charging) pumps 3/4 Within Safeguards Building of each unit Outside Recirc Spray pumps Low Head Safety Injection pumps |
| | |
| | ECCS PREACS System Design is Unique. |
| | The system is made up of three subsystems, which operate both during normal operations and during accident conditions: |
| | 3/4 Unit 1 Safeguards Building Exhaust 3/4 Unit 2 Safeguards Building Exhaust 3/4 Auxiliary Building Central Exhaust (shared between units) |
| | |
| | ECCS PREACS 3/4 System is once-once-through exhaust exhaust--only ventilation 3/4 Maintains negative pressure in pump rooms PUMP ROOM Negative pressure ensures air flows inward |
| | |
| | ECCS PREACS ECCS PREACS is interconnected with other subsystems which are shutdown during accident conditions. |
| | Each subsystem can be diverted through common filter banks Each subsystem has two or three exhaust fans |
| | |
| | PREACS normal lineup Vent Vent 2-HV-F-40A/B Stack B Stack A 1-HV-F-8A/B/C 1-HV-F-40A/B U2 U1 Aux Bldg SFGDS SFGDS Central Ref: 11715-FB-006A, sh. 3 |
| | |
| | PREACS accident lineup 2-HV-F-40A/B 1-HV-F-8A/B/C 1-HV-F-40A/B U2 U1 AB SFGDS SFGDS Central |
| | |
| | ECCS PREACS 3/4Safeguards Area Ventilation subsystems (one for each h Unit) |
| | U i) From filters 2-HV-F-40B 3/4Auxiliary Building Central Exhaust 1-HV-F-8C subsystem (shared between Units) |
| | From filters |
| | |
| | PREACS accident functions: |
| | : 1) Provide particulate filtration and iodine adsorption of ECCS Pump Rooms to ensure Control Room Operator and EAB/LPZ doses are below regulatory limits Auxiliary Building Filter 1-HV-FL-3B |
|
| |
|
| subsystem (shared between Units)From filters 2-HV-F-40B 1-HV-F-8C From filters PREACS accident functions:
| |
| PREACS accident functions: | | PREACS accident functions: |
| 1) 1)Provide particulate Provide particulate filtration and iodine filtration and iodine adsorption of ECCS adsorption of ECCS PumpRoomsto PumpRoomsto Pump Rooms to Pump Rooms to ensure Control Room ensure Control Room Operator and Operator and EAB/LPZ doses are EAB/LPZ doses are below regulatory below regulatory limits limitsAuxiliary Building Filter1-HV-FL-3B PREACS accident functions:
| | Outside Recirc Spray Pumps |
| PREACS accident functions:2) Provide ventilation
| | : 2) Provide ventilation (cooling) to ECCS Pump Rooms HHSI (Charging) Pumps LHSI Pumps |
| : 2) Provide ventilation (cooling) to ECCS Pump (cooling) to ECCS Pump Rooms RoomsOutside Recirc Spray PumpsHHSI (Charging) PumpsLHSI Pumps ECCS PREACS: | | |
| ECCS PREACS: | | ECCS PREACS: |
| Cooling: | | Cooling: |
| Cooling:Provide greater than the minimum Provide greater than the minimum--required air flow from required air flow from Sa f e guards Buildin g, within 60 minutes o f an accident.
| | 3/4 Provide greater than the minimum-minimum-required air flow from f g Safeguards Building, g, within 60 minutes off an accident. |
| Sa f e guards Buildin g, within 60 minutes o f an accident. fgg,f fgg,f Minimum air flow for charging pump cubicles is provided by Minimum air flow for charging pump cubicles is provided by internal fans on the charging pumps.internal fans on the charging pumps.Other interconnected systems are shutdown/isolated during Other interconnected systems are shutdown/isolated during accident accident ECCS PREACSECCS PREACSDose Consequences. Analyses confirm that off Dose Consequences. Analyses confirm that off--site dose and site dose and dose to CR operators are maintained within regulatory dose to CR operators are maintained within regulatory limits. Assumptions:limits. Assumptions:ECCS PREACS is only assumed in LOCA analyses ECCS PREACS is only assumed in LOCA analyses PREACSilid60i PREACSilid60i LOCA LOCA PREACS i s a li gne d at 60 m i nutes post PREACS i s a li gne d at 60 m i nutes post-
| | 3/4 Minimum air flow for charging pump cubicles is provided by internal fans on the charging pumps. |
| -LOCA LOCA Filtration is only assumed if ECCS leakage > 3400 cc/hr Filtration is only assumed if ECCS leakage > 3400 cc/hr (operational limit is 1700 cc/hr)(operational limit is 1700 cc/hr)PREACS charcoal & HEPA filter efficiencies = 98% for PREACS charcoal & HEPA filter efficiencies = 98% for aerosols; 95% for elemental iodine; 90% for organic iodidesaerosols; 95% for elemental iodine; 90% for organic iodidesFiltration assumed for 30 days post Filtration assumed for 30 days post--accident accident ECCS PREACSECCS PREACSECCS leakage is a parameter that is periodically ECCS leakage is a parameter that is periodically monitored by Operations & documented in monitored by Operations & documented in Operations logsOperations logsLoggedasonetotalwithinECCSpumprooms(where LoggedasonetotalwithinECCSpumprooms(where Logged as one total within ECCS pump rooms (where Logged as one total within ECCS pump rooms (where exhaust air is filtered) and second total outside of exhaust air is filtered) and second total outside of pump roomspump roomsLog includes adjustment by calculation to worstLog includes adjustment by calculation to worst--case case accident conditionsaccident conditions Operations monitors and Operations monitors and logs ECCS leakage rateslogs ECCS leakage rates 1-LOG-20 2-LOG-20 ECCS PREACSECCS PREACSLocation determines filtered vs. unfiltered leakage:Location determines filtered vs. unfiltered leakage:Areas where exhaust air is filtered : | | 3/4 Other interconnected systems are shutdown/isolated during accident |
| | |
| | ECCS PREACS Dose Consequences. Analyses confirm that off-off-site dose and dose to CR operators are maintained within regulatory limits. Assumptions: |
| | 3/4 ECCS PREACS is only assumed in LOCA analyses 3/4 PREACS is i aligned li d at 60 minutes i post post--LOCA 3/4 Filtration is only assumed if ECCS leakage > 3400 cc/hr (operational limit is 1700 cc/hr) 3/4 PREACS charcoal & HEPA filter efficiencies = 98% for aerosols; 95% for elemental iodine; 90% for organic iodides 3/4 Filtration assumed for 30 days post post--accident |
| | |
| | ECCS PREACS ECCS leakage is a parameter that is periodically monitored by Operations & documented in Operations logs Logged as one total within ECCS pump rooms (where exhaust air is filtered) and second total outside of pump rooms Log includes adjustment by calculation to worst-worst-case accident conditions |
| | |
| | Operations monitors and logs ECCS leakage rates 1-LOG-20 2-LOG-20 |
| | |
| | ECCS PREACS Location determines filtered vs. unfiltered leakage: |
| | 3/4 Areas where exhaust air is filtered : |
| | 3/4Charging Ch i pump cubicles bi l 3/4Safeguards Building 3/4 Areas where exhaust air is unfiltered: |
| | 3/4Other Aux Building areas 3/4Quench Spray Pump House |
| | |
| | Filtered Filtered== |
| | PREACS PREACS Ref: UFSAR Section 15.4 |
| | |
| | ECCS PREACS ECCS leakage log history: |
| | 3/4 Normal total leakage is < 500 cc/hr (usually 100-100-300 cc/hr) 3/4 Occasionally components having leakage of 500-500-1000 cc/hr are noted t d andd promptly tl repaired i d 3/4 Prior issue with excessive leakage on Charging pump seals was resolved through modification (2003-(2003-05) & procedures 3/4 Only twice recently has there been individual component leakage > 1700 cc/hr, but it was isolated within a shift (a valve in 2003 and a pump in 2005) |
| | |
| | ECCS PREACS 3/4 Original system design criteria was based on 900 cc/hr maximum potential leakage to atmosphere 3/4 Current design criteria is shown in UFSAR Figure 15.4--111 (from 1,700 cc/hr unfiltered leakage to 15.4 17,000 cc/hr filtered leakage) |
|
| |
|
| Areas where exhaust air is filtered :
| | ECCS PREACS ECCS Leakage has been evaluated for the post post--LOCA pump mission time: |
| Chibil Chibil Ch arg ing pump cu bi c l es Ch arg ing pump cu bi c l esSafeguards Building Safeguards BuildingAreas where exhaust air is unfiltered:
| | 3/4 LHSI & OSRS pumps have tandem seal design, with clean water source supplied to an annular volume between the inboard and outboard seals. |
| | seals Prevents excessive seal wear wear. |
| | 3/4 Evaluations have been completed for GSI GSI--191 of the HHSI Pump Seals to show that DBA-DBA-generated debris will not cause mechanical seal leakage to exceed limits during the pump mission time. |
|
| |
|
| Areas where exhaust air is unfiltered:Other Aux Building areas Other Aux Building areasQuench Spray Pump House Quench Spray Pump House Ref: UFSAR Section 15.4Filtered =
| | ECCS PREACS Basis for extended Completion Time: |
| PREACSFiltered =
| | 3/4 Margin between operating limits and actual dose limits 3/4 Operating history shows ECCS leakage is normally low, & |
| PREACS ECCS PREACSECCS PREACSECCS leakage log history:
| | sudden changes in ECCS leakage > limits are not expected 3/4 Unnecessary two-two-unit shutdown has associated risks 3/4 System design is unique with several dampers that could have leak leak--by affecting both trains. TS 3.0.3 has been entered multiple times because of this. |
| ECCS leakage log history:
| | 3/4 Time needed to complete repairs may be significant}} |
| Normal total leakage is < 500 cc/hr (usually 100 Normal total leakage is < 500 cc/hr (usually 100-
| |
| -300 cc/hr) 300 cc/hr)Occasionally components having leakage of 500 Occasionally components having leakage of 500-
| |
| -1000 cc/hr 1000 cc/hr tddtlid tddtlidare no t e d an d promp tly repa i re dare no t e d an d promp tly repa i re d Prior issue with excessive leakage on Charging pump seals Prior issue with excessive leakage on Charging pump seals was resolved through modification (2003was resolved through modification (2003--05) & procedures05) & proceduresOnly twice recently has there been individual component Only twice recently has there been individual component leakage > 1700 cc/hr, but it was isolated within a shift (a leakage > 1700 cc/hr, but it was isolated within a shift (a valve in 2003 and a pump in 2005)valve in 2003 and a pump in 2005)
| |
| ECCS PREACSECCS PREACS Original system design criteria was based on 900 Original system design criteria was based on 900 cc/hr maximum potential leakage to atmospherecc/hr maximum potential leakage to atmosphereCurrent design criteria is shown in UFSAR Figure Current design criteria is shown in UFSAR Figure 15.4 15.4--111 (from 1,700 cc/hr unfiltered leakage to 111 (from 1,700 cc/hr unfiltered leakage to 17,000 cc/hr filtered leakage)17,000 cc/hr filtered leakage) | |
| ECCS PREACSECCS PREACSECCS Leakage has been evaluated for the post ECCS Leakage has been evaluated for the post--LOCA pump LOCA pump mission time:
| |
| mission time:LHSI & OSRS pumps have tandem seal design, with clean LHSI & OSRS pumps have tandem seal design, with clean water source supplied to an annular volume between the water source supplied to an annular volume between the inboardandoutboardsealsPreventsexcessivesealwear inboardandoutboardsealsPreventsexcessivesealwearinboard and outboard seals. Prevents excessive seal wear.inboard and outboard seals. Prevents excessive seal wear.Evaluations have been completed for GSI Evaluations have been completed for GSI-
| |
| -191 of the HHSI 191 of the HHSI Pump Seals to show that DBA Pump Seals to show that DBA--generated debris will not generated debris will not cause mechanical seal leakage to exceed limits during the cause mechanical seal leakage to exceed limits during the pump mission time.
| |
| pump mission time.
| |
| ECCS PREACSECCS PREACSBasis for extended Completion Time:
| |
| Basis for extended Completion Time:Margin between operating limits and actual dose limits Margin between operating limits and actual dose limitsOperating history shows ECCS leakage is normally low, &
| |
| Operating history shows ECCS leakage is normally low, & sudden changes in ECCS leakage > limits are not expectedsudden changes in ECCS leakage > limits are not expected Unnecessary two Unnecessary two--unit shutdown has associated risks unit shutdown has associated risks System design is unique with several dampers that could System design is unique with several dampers that could have leak have leak--by affecting both trains. TS 3.0.3 has been entered by affecting both trains. TS 3.0.3 has been entered multiple times because of this.multiple times because of this.Time needed to complete repairs may be significant Time needed to complete repairs may be significant}}
| |
Letter Sequence Request |
|---|
|
|
MONTHYEARML0915605552009-06-0808 June 2009
Notice of Meeting with Virginia Electric and Power Co. (Dominion) to Discuss a Proposed License Amendment Regarding the Emergency Core Cooling System (ECCS) Pump Room Exhaust Air Cleanup System
Project stage: Meeting
ML0920801692009-08-0505 August 2009
Summary of Public Meeting with Duke Energy Carolinas, LLC to Discuss a Proposed Licensee Amendment Regarding the Emergency Core Cooling System Pump Room Exhaust Air Clean Up System (ECCS Preacs)
Project stage: Meeting
ML0917610472009-08-0505 August 2009
ECCS Preacs Filtration Presentation
Project stage: Request
2009-06-08
[Table View] |
|
|---|
Category:Meeting Briefing Package/Handouts
MONTHYEARML24029A2362024-01-30030 January 2024
Preliminary Results of the Environmental Review, Subsequent License Renewal
ML23338A1522023-12-0707 December 2023
Public Meeting Slides for North Anna and Surry Emergency Plan Augmentation Times License Amendment Request
ML23255A0992023-09-15015 September 2023
Slides for September 15, 2023 Public Meeting on Poanhi Seismic Evaluations
ML23103A3482023-04-14014 April 2023
Annual Assessment Meeting Presentation for North Anna and Surry
ML21221A0332022-06-17017 June 2022
Meeting Summary: Discussion of Dominion'S Response to Select Staff Requests for Additional Information on Subsequent License Renewal Application (EPID No. L-2020-SLR-0000) - NRC Slides
ML21174A3042021-06-23023 June 2021
SLRA RAI Response Public Meeting - 21-06-24
ML21221A1542021-05-27027 May 2021
Meeting Summary: Discussion of Dominion'S Response to Select Staff Requests for Additional Information on Subsequent License Renewal Application (EPID No. L-2020-SLR-0000) - Dominion Slides
ML21145A2172021-05-13013 May 2021
Discussion on May 13, 2021 with Dominion on Select Staff RAIs on North Anna Subsequent License Renewal Application - Dominion Slides
ML21132A2892021-05-13013 May 2021
SLRA RAI Response Public Meeting
ML21034A5972021-02-10010 February 2021
External Presentation Am Atkinson_Nrc ISG-06 Meeting Dominion Digital IC Project 02102021
ML20288A3472020-10-14014 October 2020
(COVID-19) Emergency Preparedness Exemption Pre-Application Meeting
ML20099F2992020-04-0909 April 2020
NRC Slides for North Anna pre-app April 9
ML20099F2412020-04-0909 April 2020
Co., NRC Safety Pre& 8208;Application Meeting North Anna Power Station (NAPS)
ML20098B6022020-04-0707 April 2020
Annual Assessment Meeting Presentation
ML19297D1872019-11-18018 November 2019
Pre-Application Meeting - Dominion Slides
ML18320A2502018-11-20020 November 2018
50.90 License Amendment Request - Dominion Fleet EAL Scheme Changes, November 20, 2018 Public Meeting
ML18141A3072018-05-21021 May 2018
18 - SLR Status
ML17123A2092017-05-0303 May 2017
Summary of Meeting to Discuss Annual Assessment of the North Anna Power Station, Units 1 and 2 with the Public for the Period of January 1, 2016 Through December 31, 2016
ML16124A7582016-05-0303 May 2016
April 14, 2016, Summer of Public Meeting - North Anna, Units 1 and 2
ML16124A7632016-05-0303 May 2016
April 14, 2016, Summary of Public Meeting - North Anna Power Station, Units 1 and 2
ML16104A3822016-04-26026 April 2016
New Fuel Storage Rack & SFP Criticality Analysis for April 26th 2016 Scheduled Category 1, Pre-Submittal Public Teleconference
ML16104A3872016-04-13013 April 2016
Criticality Analysis Checklist for North Anna
ML15273A4292015-09-29029 September 2015
Revised Slides for September 29, 2015 Meeting with Dominion Re North Anna ISFSI License Renewal
ML15153A0452015-05-13013 May 2015
Revised North Anna ISFSI Presentation Slides - TN-32 High Burnup Dry Storage Research Project, May 13, 2015 (Tom Brookmire)
ML15133A0822015-05-13013 May 2015
ISFSI Presentation Slides - TN-32 High Burnup Dry Storage Research Project, May 13, 2015 (Tom Brookmire)
ML15128A5462015-05-0808 May 2015
Summary of Public Meeting with North Anna, Units 1 and 2 to Discuss the Annual Assessment with the Public
ML14101A1202014-04-11011 April 2014
Public Meeting Summary - North Anna Power Station, Docket Nos. 50-338, 50-339
ML14058B1762014-03-0606 March 2014
Presentation Slides - North Anna ISFSI - High Burnup Dry Storage Confirmatory Data Project, TN-32 Storage Cask, Tom Brookmire, March 6, 2014, Docket No. 72-16, TAC No: L24886
ML14071A1672014-01-28028 January 2014
Enclosure 2: Presentation Slides - North Anna ISFSI TN-32 Cask and Pad 1 Assessments Following August 23, 2011, Central Virginia Earthquake
ML13159A0092013-06-0404 June 2013
Notable Failures in Nondustructive Testing - June 4, 2013 Public Meeting
ML12257A2002012-09-11011 September 2012
2-North Anna Extent of Condition Presentation 9-7-12 Sept 10
ML12257A2342012-09-11011 September 2012
5-Hacker - North Anna Mockup and Search Unit Action Presentation Sept 10
ML12131A5052012-05-0909 May 2012
Presentation for 2011 North Anna EOC Annual Assessment Meeting
ML11305A0452011-11-0101 November 2011
Region II - North Anna Public Meeting Slides
ML11305A0622011-11-0101 November 2011
Restart Readiness, Public Meeting PR2
ML11276A0242011-10-0303 October 2011
Slides-North Anna AIT Public Meeting October 3, 2011
ML1127701352011-10-0303 October 2011
Ltr to D. Heacock Re Participation in the Commission Meeting on the North Anna Plant on 10/21/11
ML11252A0062011-09-0808 September 2011
Dominion'S Slides Earthquake Response and North Anna Restart Readiness Demonstration Plan
ML1124205512011-08-30030 August 2011
Seismic Event
ML1110304982011-04-13013 April 2011
Public Meeting Handouts
ML1110304942011-04-13013 April 2011
Public Meeting Attendees
ML1032204442010-11-18018 November 2010
Public Meeting Summary - North Anna Power Station
ML1020100212010-07-14014 July 2010
Nucler Power Station, Units 1 and 2, Westinghouse RFA-2 Fuel Transition Licensing Meeting Presentation Slides
ML1012600332010-05-0505 May 2010
Meeting Posters
ML1012600342010-05-0505 May 2010
Public Mtg. Slides
ML0917610472009-08-0505 August 2009
ECCS Preacs Filtration Presentation
ML0911000392009-04-17017 April 2009
Notice of Public Meeting Category 1 - Annual Assessment of North Anna Power Station
ML0820501832008-07-23023 July 2008
Meeting Announcement - Summary of Public Meeting Category 1 - Performance Discussion Meeting, North Anna Power Station
ML0812008742008-03-24024 March 2008
Annual Assessment Meeting Reactor Oversight Program - Cy 2007
ML0730400332007-11-0101 November 2007
Public Meeting Slides for Meeting with Dominion Nuclear
2024-01-30
[Table view]
Category:Slides and Viewgraphs
MONTHYEARML24029A2362024-01-30030 January 2024
Preliminary Results of the Environmental Review, Subsequent License Renewal
ML23338A1522023-12-0707 December 2023
Public Meeting Slides for North Anna and Surry Emergency Plan Augmentation Times License Amendment Request
ML23255A0992023-09-15015 September 2023
Slides for September 15, 2023 Public Meeting on Poanhi Seismic Evaluations
ML23103A3482023-04-14014 April 2023
Annual Assessment Meeting Presentation for North Anna and Surry
ML21221A0332022-06-17017 June 2022
Meeting Summary: Discussion of Dominion'S Response to Select Staff Requests for Additional Information on Subsequent License Renewal Application (EPID No. L-2020-SLR-0000) - NRC Slides
ML22091A0902022-04-0101 April 2022
Combined 2021 Assessment Meeting Slides
ML21221A1542021-05-27027 May 2021
Meeting Summary: Discussion of Dominion'S Response to Select Staff Requests for Additional Information on Subsequent License Renewal Application (EPID No. L-2020-SLR-0000) - Dominion Slides
ML21221A1482021-05-27027 May 2021
Meeting Summary: Discussion of Dominion'S Response to Select Staff Requests for Additional Information on Subsequent License Renewal Application (EPID No. L-2020-SLR-0000) - NRC Slides
ML21132A2892021-05-13013 May 2021
SLRA RAI Response Public Meeting
ML21145A2172021-05-13013 May 2021
Discussion on May 13, 2021 with Dominion on Select Staff RAIs on North Anna Subsequent License Renewal Application - Dominion Slides
ML21034A5972021-02-10010 February 2021
External Presentation Am Atkinson_Nrc ISG-06 Meeting Dominion Digital IC Project 02102021
ML20288A3472020-10-14014 October 2020
(COVID-19) Emergency Preparedness Exemption Pre-Application Meeting
ML20099F2412020-04-0909 April 2020
Co., NRC Safety Pre& 8208;Application Meeting North Anna Power Station (NAPS)
ML20099F2992020-04-0909 April 2020
NRC Slides for North Anna pre-app April 9
ML20098B6022020-04-0707 April 2020
Annual Assessment Meeting Presentation
ML19297D1872019-11-18018 November 2019
Pre-Application Meeting - Dominion Slides
ML18141A3072018-05-21021 May 2018
18 - SLR Status
ML16124A7582016-05-0303 May 2016
April 14, 2016, Summer of Public Meeting - North Anna, Units 1 and 2
ML16124A7632016-05-0303 May 2016
April 14, 2016, Summary of Public Meeting - North Anna Power Station, Units 1 and 2
ML15273A4292015-09-29029 September 2015
Revised Slides for September 29, 2015 Meeting with Dominion Re North Anna ISFSI License Renewal
ML15133A0822015-05-13013 May 2015
ISFSI Presentation Slides - TN-32 High Burnup Dry Storage Research Project, May 13, 2015 (Tom Brookmire)
ML15153A0452015-05-13013 May 2015
Revised North Anna ISFSI Presentation Slides - TN-32 High Burnup Dry Storage Research Project, May 13, 2015 (Tom Brookmire)
ML15128A5462015-05-0808 May 2015
Summary of Public Meeting with North Anna, Units 1 and 2 to Discuss the Annual Assessment with the Public
ML14058B1762014-03-0606 March 2014
Presentation Slides - North Anna ISFSI - High Burnup Dry Storage Confirmatory Data Project, TN-32 Storage Cask, Tom Brookmire, March 6, 2014, Docket No. 72-16, TAC No: L24886
ML14071A1672014-01-28028 January 2014
Enclosure 2: Presentation Slides - North Anna ISFSI TN-32 Cask and Pad 1 Assessments Following August 23, 2011, Central Virginia Earthquake
ML13159A0092013-06-0404 June 2013
Notable Failures in Nondustructive Testing - June 4, 2013 Public Meeting
ML12257A2342012-09-11011 September 2012
5-Hacker - North Anna Mockup and Search Unit Action Presentation Sept 10
ML12257A2002012-09-11011 September 2012
2-North Anna Extent of Condition Presentation 9-7-12 Sept 10
ML12131A5052012-05-0909 May 2012
Presentation for 2011 North Anna EOC Annual Assessment Meeting
ML11305A0452011-11-0101 November 2011
Region II - North Anna Public Meeting Slides
ML11305A0622011-11-0101 November 2011
Restart Readiness, Public Meeting PR2
ML1128500392011-10-12012 October 2011
Summary of Augmented Inspection Team Public Exit Meeting with Virginia Electric Power Company to Discuss the Results of an ATI Inspection of an Earthquake Event on August 23, 2011
ML11276A0242011-10-0303 October 2011
Slides-North Anna AIT Public Meeting October 3, 2011
ML1127701352011-10-0303 October 2011
Ltr to D. Heacock Re Participation in the Commission Meeting on the North Anna Plant on 10/21/11
ML11252A0062011-09-0808 September 2011
Dominion'S Slides Earthquake Response and North Anna Restart Readiness Demonstration Plan
ML12040A2742011-08-31031 August 2011
E-Mail from G. Wilson, NRR to D. Merzke, EDO; Subject: Seismic Instruments at North Anna
ML12044A2792011-08-30030 August 2011
Email from M. Khanna, NRR to R. Auluck, NRR FW: North Anna Earthquake Issue Commissioner Briefing Final with Talking Points
ML1124205512011-08-30030 August 2011
Seismic Event
ML12044A2912011-08-30030 August 2011
E-mail from G. Bowman, EDO to T. Hipschman, Comm, Et Al; Subject: FYI-Revised Slides on North Anna/Gl-199
ML12044A2572011-08-26026 August 2011
Email from A. Istar, NRR to A. Hiser, NRR on North Anna Nuclear Power Plant. Pptx
ML1110304822011-04-13013 April 2011
Public Annual Assessment Meeting/Open House Slides
ML1032204442010-11-18018 November 2010
Public Meeting Summary - North Anna Power Station
ML1021102592010-08-0404 August 2010
Enclosure 3: Dominion - North Anna Presentation of July 28, 2010 Public Meeting
ML1020100212010-07-14014 July 2010
Nucler Power Station, Units 1 and 2, Westinghouse RFA-2 Fuel Transition Licensing Meeting Presentation Slides
ML1012600342010-05-0505 May 2010
Public Mtg. Slides
ML1012600332010-05-0505 May 2010
Meeting Posters
ML0917610472009-08-0505 August 2009
ECCS Preacs Filtration Presentation
ML0912104262009-05-12012 May 2009
7th International Conference on NDE - Presentation :a Destructive Validation of NDE Responses of Service-Induced PWSCC Found in North Anna 2 Control Rod Drive Nozzle 31
ML0820501832008-07-23023 July 2008
Meeting Announcement - Summary of Public Meeting Category 1 - Performance Discussion Meeting, North Anna Power Station
ML0812008742008-03-24024 March 2008
Annual Assessment Meeting Reactor Oversight Program - Cy 2007
2024-01-30
[Table view] |
Text
North Anna Power Station ECCS PREACS Filtration June 24, 2009 One White Flint North
ECCS PREACS Purpose of Technical Specification changes:
- 1) Specifically address the filtration function of the ECCS Pump Room Exhaust Air Cleanup System
- 2) Reconcile R il TS with ith the th associated i t d design d i andd licensing li i basis assumptions.
ECCS PREACS NRC concerns from 2/19/09 teleconference :
3/4 Sufficient justification for the proposed completion time for one train of ECCS PREACS inoperable 3/4 Reference to UFSAR Figure 15.4- 15.4 15 4-4-110 3/4 Description of the surveillance requirements that will assure ECCS leakage does not exceed the unfiltered leakage limit
ECCS PREACS Changes will add actions to determine if filtration is required:
3/4 New Condition B - One train inoperable due to filtration capability 3/4 New Condition C - Two trains inoperable due to filtration capability 3/4 Modified Condition D - Two trains inoperable due to ECCS pump room boundary
ECCS PREACS Emergency Core Cooling System Pumps are located:
3/4 Within Auxiliary Building, Charging Pump cubicles High Head Safety Injection (charging) pumps 3/4 Within Safeguards Building of each unit Outside Recirc Spray pumps Low Head Safety Injection pumps
ECCS PREACS System Design is Unique.
The system is made up of three subsystems, which operate both during normal operations and during accident conditions:
3/4 Unit 1 Safeguards Building Exhaust 3/4 Unit 2 Safeguards Building Exhaust 3/4 Auxiliary Building Central Exhaust (shared between units)
ECCS PREACS 3/4 System is once-once-through exhaust exhaust--only ventilation 3/4 Maintains negative pressure in pump rooms PUMP ROOM Negative pressure ensures air flows inward
ECCS PREACS ECCS PREACS is interconnected with other subsystems which are shutdown during accident conditions.
Each subsystem can be diverted through common filter banks Each subsystem has two or three exhaust fans
PREACS normal lineup Vent Vent 2-HV-F-40A/B Stack B Stack A 1-HV-F-8A/B/C 1-HV-F-40A/B U2 U1 Aux Bldg SFGDS SFGDS Central Ref: 11715-FB-006A, sh. 3
PREACS accident lineup 2-HV-F-40A/B 1-HV-F-8A/B/C 1-HV-F-40A/B U2 U1 AB SFGDS SFGDS Central
ECCS PREACS 3/4Safeguards Area Ventilation subsystems (one for each h Unit)
U i) From filters 2-HV-F-40B 3/4Auxiliary Building Central Exhaust 1-HV-F-8C subsystem (shared between Units)
From filters
PREACS accident functions:
- 1) Provide particulate filtration and iodine adsorption of ECCS Pump Rooms to ensure Control Room Operator and EAB/LPZ doses are below regulatory limits Auxiliary Building Filter 1-HV-FL-3B
PREACS accident functions:
Outside Recirc Spray Pumps
- 2) Provide ventilation (cooling) to ECCS Pump Rooms HHSI (Charging) Pumps LHSI Pumps
ECCS PREACS:
Cooling:
3/4 Provide greater than the minimum-minimum-required air flow from f g Safeguards Building, g, within 60 minutes off an accident.
3/4 Minimum air flow for charging pump cubicles is provided by internal fans on the charging pumps.
3/4 Other interconnected systems are shutdown/isolated during accident
ECCS PREACS Dose Consequences. Analyses confirm that off-off-site dose and dose to CR operators are maintained within regulatory limits. Assumptions:
3/4 ECCS PREACS is only assumed in LOCA analyses 3/4 PREACS is i aligned li d at 60 minutes i post post--LOCA 3/4 Filtration is only assumed if ECCS leakage > 3400 cc/hr (operational limit is 1700 cc/hr) 3/4 PREACS charcoal & HEPA filter efficiencies = 98% for aerosols; 95% for elemental iodine; 90% for organic iodides 3/4 Filtration assumed for 30 days post post--accident
ECCS PREACS ECCS leakage is a parameter that is periodically monitored by Operations & documented in Operations logs Logged as one total within ECCS pump rooms (where exhaust air is filtered) and second total outside of pump rooms Log includes adjustment by calculation to worst-worst-case accident conditions
Operations monitors and logs ECCS leakage rates 1-LOG-20 2-LOG-20
ECCS PREACS Location determines filtered vs. unfiltered leakage:
3/4 Areas where exhaust air is filtered :
3/4Charging Ch i pump cubicles bi l 3/4Safeguards Building 3/4 Areas where exhaust air is unfiltered:
3/4Other Aux Building areas 3/4Quench Spray Pump House
Filtered Filtered==
PREACS PREACS Ref: UFSAR Section 15.4
ECCS PREACS ECCS leakage log history:
3/4 Normal total leakage is < 500 cc/hr (usually 100-100-300 cc/hr) 3/4 Occasionally components having leakage of 500-500-1000 cc/hr are noted t d andd promptly tl repaired i d 3/4 Prior issue with excessive leakage on Charging pump seals was resolved through modification (2003-(2003-05) & procedures 3/4 Only twice recently has there been individual component leakage > 1700 cc/hr, but it was isolated within a shift (a valve in 2003 and a pump in 2005)
ECCS PREACS 3/4 Original system design criteria was based on 900 cc/hr maximum potential leakage to atmosphere 3/4 Current design criteria is shown in UFSAR Figure 15.4--111 (from 1,700 cc/hr unfiltered leakage to 15.4 17,000 cc/hr filtered leakage)
ECCS PREACS ECCS Leakage has been evaluated for the post post--LOCA pump mission time:
3/4 LHSI & OSRS pumps have tandem seal design, with clean water source supplied to an annular volume between the inboard and outboard seals.
seals Prevents excessive seal wear wear.
3/4 Evaluations have been completed for GSI GSI--191 of the HHSI Pump Seals to show that DBA-DBA-generated debris will not cause mechanical seal leakage to exceed limits during the pump mission time.
ECCS PREACS Basis for extended Completion Time:
3/4 Margin between operating limits and actual dose limits 3/4 Operating history shows ECCS leakage is normally low, &
sudden changes in ECCS leakage > limits are not expected 3/4 Unnecessary two-two-unit shutdown has associated risks 3/4 System design is unique with several dampers that could have leak leak--by affecting both trains. TS 3.0.3 has been entered multiple times because of this.
3/4 Time needed to complete repairs may be significant
