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| {{#Wiki_filter:NRC MeetingRevise Footnote in TS 3.8.1March 3, 2011 Xcel Energy ParticipantsJon Anderson Regulatory Affairs ManagerCorey Hessen General Manager -EngineeringThomas Roddey Prairie Island Site Engineering DirectorMarcia Thompson Project SponsorBob Flaaen Plant Engineering Interface Dale Vincent Licensing Engineer AgendaIntroductions-Jon AndersonMeeting purpose-Jon AndersonScope of LAR-Jon AndersonLAR Background-Dale VincentProposed TS and Bases changes -Dale VincentBattery Charger Modification -Marcia ThompsonBasis for Alternative Modification-Marcia ThompsonRequested Schedule Basis-Thomas RoddeyRAI discussion-Dale VincentSummary -Thomas Roddey Meeting GoalsDiscuss LAR to revise SR 3.8.1.10.c footnoteProvide technical basis for battery charger modificationSchedule basis Scope of LARRevise footnoteBattery charger modification under 10 CFR 50.59 LAR Background -112 Battery Charger manual actions identifiedD2 operability question Exigent LAR October 14, 2010SR 3.8.1.10.c footnote added LAR Background -2October 2010 LAR stated:NSPM is planning a modification to the 12 Battery Charger that will automatically shed the battery charger during an undervoltage event (e.g. LOOP, SI with LOOP or other undervoltage condition) and then repower the battery charger back on the bus within the 60 seconds required by the current TS. | | {{#Wiki_filter:NRC Meeting Revise Footnote in TS 3.8.1 March 3, 2011 |
| LAR Background -3Current SR 3.8.1.10.c footnote:A modification will be installed during or prior to the Unit 1 2011 refueling outage to automatically shed the 12 Battery Charger from its normal bus and then automatically repower the charger from the bus within 60 seconds. Compliance with this SR will be demonstrated after implementation of the modification. | | |
| Proposed TS and Bases Changes -1Revise SR 3.8.1.10.c footnote to read:A modification will be installed during or prior to the Unit 1 2011 refueling outage to assure the 12 Battery Charger is automatically powered from its normal bus within 60 seconds. Compliance with this SR will be demonstrated after implementation of the modification. | | Xcel Energy Participants Jon Anderson - Regulatory Affairs Manager Corey Hessen - General Manager - Engineering Thomas Roddey - Prairie Island Site Engineering Director Marcia Thompson - Project Sponsor Bob Flaaen - Plant Engineering Interface Dale Vincent - Licensing Engineer |
| Proposed TS and Bases Changes -2Revise SR 3.8.1.10 Bases:Note 3 is provided to allow D2 DG to be OPERABLE without requiring the 12 Battery Charger to be energized until completion of the Unit 1 2011 refueling outage. | | |
| Battery Charger Modification -1 Battery Charger Study options (October 2010):1.SI contact2.New chargers3.C&D Technologies, Inc. battery charger control modification4.Low voltage relay control modification5.Charger output based control modification Battery Charger Modification -2 Selected modifications 1 and 4Most viable Equipment external to chargersOpening/closing power supply breaker to charger based on charger input voltageAutomatic shedding and repowering of the chargers NSPM approved modification concept Early December 2010 Battery Charger Modification -3 PBNP Ametek SCI chargerNot susceptible to the C&D charger lockupIdentified late December 2010Could meet PINGP performance requirements Would not meet PINGP seismic and physical dimension requirements Battery Charger Modification -4 VEGP Ametek SCI chargerIdentified during reviews with AmetekMeets PINGP design and performance requirementsProcure on expedited schedule Battery Charger Modification -5 Internal control features of the Ametek SCI chargers Not susceptible to conditions which cause PINGP charger lockupInternal control relay Prevent back feeding control circuit board Relay senses incoming AC line voltageShut off charger -AC voltage below relay dropout setpointRestart charger -voltage returns above pickup setpointInstantaneous shutoff Time delay on reset -a few seconds Battery Charger Modification -6 PBNP prototype Ametek battery charger testingPINGP has known voltage variations outside nameplate ratingInformational testing January 2011Confirm engineering design review of the control circuit operationEquipped with internal control function Demonstrate charger capabilities, operation, shutdown, and automatic restart during anticipated voltage transients outside the nameplate rating of the chargers. | | Agenda |
| Battery Charger Modification -7 Factory Acceptance Testing (April 2011)Per Ametek quality assurance program Specified in NSPM purchase orderFormal documentation of charger capabilitiesshut off and reset setpointstime delaysother operating requirements Battery Charger Modification -8 Ametek SCI battery charger controls accommodate AC input voltage variations SR 3.8.1.10 footnote specifically statesmodification will be installed to automatically its busSR 3.8.1.10 footnote requires revision to allow installation of the Ametek SCI battery charger Battery Charger Modification -9 Schedule MilestonesIssue Ametek contract for Unit 1 chargers Unit 1 30% EC Design Review meetingUnit 1 90% EC Design Review meetingBattery charger shipped to PINGP Start Unit 1 2011 outageUnit 1 outage installation and post-modification testingUnit 1 integrated SI test Basis for Alternative Modification -1Battery charger considerations:Required logic internal to chargerModification performed in controlled shop environment Testing performed in advance of installation Basis for Alternative Modification -2Plant design considerations:Simpler design Spare breaker on Bus 16 preservedMaintenance sources at the 480V level preservedRelay setting or logic design coordination not required Basis for Alternative Modification -3Plant modification considerations:Simpler installationFocus Engineering and procurement resourcesReduces procurement riskAvoid: new power cable installationfire penetration work when routing new cablesadditions to the load sequencer cabinets Reduces outage work time and outage testing time Requested Schedule Basis -1Refueling outage scheduleRequest review and approval by May 6, 2011 Current footnote specifies resolution by end of Unit 1 2011 refueling outageTesting performed after modification Requested Schedule Basis -2Battery charger replacement decision January 2011 LAR submitted approximately one week after decision RAI discussion -11.Provide a comparison of the major electrical parameters including the minimum voltage requirement of the alternating current (AC) input breaker, drop out, reset for the existing and proposed new battery chargers. Discuss in detail the electrical parameters for the proposed new charger that are different than the existing 12 charger and how these parameters were determined to be acceptable. 2.Discuss whether the description of existing and new battery chargers will be provided in a future revision of the PINGP Updated Final Safety Analysis Report (UFSAR). 3.Confirm that the proposed new battery charger can recharge its associated battery to the fully charged state within 24 hours while supplying its normal loads after a battery discharge to the bounding design basis event discharge state in accordance with PINGP UFSAR Section 8.5.3 and Technical Specification Surveillance Requirement 3.8.4.2. | | * Introductions -Jon Anderson |
| RAI discussion -24.Industry operating experience has shown that momentary overvoltage or undervoltage transients experienced during switching, fault or lightning-related perturbations can trigger a self-protecting lockout feature in battery chargers resulting in disabling the chargers. Provide details on the magnitude and duration of transient and sustained overvoltage/undervoltage conditions resulting from grid perturbations (or the emergency diesel generator system) that have been evaluated for operation of the proposed battery charger. 5.Technical Specification SR 3.8.1.10 NOTE 3 states that the 12 Battery Charger is not required to be energized during performance of SR 3.8.1.10(c) until the completion of Unit 1 2011 refueling outage. The license amendment request proposes a footnote stating that the battery charger equipment will be modified during or prior to the Unit 1 2011 refueling outage. State why NOTE 3 was not modified to apply only until the new equipment has been installed and tested. | | * Meeting purpose -Jon Anderson |
| RAI discussion -3Proposed response scheduleTwo weeks from receipt of letter SummaryTS require 12 Battery Charger modification during Unit 1 2011 refueling outage Battery charger replacement modification assures battery charger function performed This LAR proposes to revise footnote to allow battery charger replacement modificationExpedited review and approval requested}} | | * Scope of LAR -Jon Anderson |
| | * LAR Background -Dale Vincent |
| | * Proposed TS and Bases changes -Dale Vincent |
| | * Battery Charger Modification -Marcia Thompson |
| | * Basis for Alternative Modification -Marcia Thompson |
| | * Requested Schedule Basis -Thomas Roddey |
| | * RAI discussion -Dale Vincent |
| | * Summary -Thomas Roddey |
| | |
| | Meeting Goals |
| | * Discuss LAR to revise SR 3.8.1.10.c footnote |
| | * Provide technical basis for battery charger modification |
| | * Schedule basis |
| | |
| | Scope of LAR |
| | * Revise footnote |
| | * Battery charger modification under 10 CFR 50.59 |
| | |
| | LAR Background -1 |
| | * 12 Battery Charger manual actions identified |
| | * D2 operability question |
| | * Exigent LAR October 14, 2010 |
| | * SR 3.8.1.10.c footnote added |
| | |
| | LAR Background - 2 |
| | * October 2010 LAR stated: |
| | NSPM is planning a modification to the 12 Battery Charger that will automatically shed the battery charger during an undervoltage event (e.g. |
| | LOOP, SI with LOOP or other undervoltage condition) and then repower the battery charger back on the bus within the 60 seconds required by the current TS. |
| | |
| | LAR Background - 3 |
| | * Current SR 3.8.1.10.c footnote: |
| | A modification will be installed during or prior to the Unit 1 2011 refueling outage to automatically shed the 12 Battery Charger from its normal bus and then automatically repower the charger from the bus within 60 seconds. Compliance with this SR will be demonstrated after implementation of the modification. |
| | |
| | Proposed TS and Bases Changes - 1 |
| | * Revise SR 3.8.1.10.c footnote to read: |
| | A modification will be installed during or prior to the Unit 1 2011 refueling outage to assure the 12 Battery Charger is automatically powered from its normal bus within 60 seconds. Compliance with this SR will be demonstrated after implementation of the modification. |
| | |
| | Proposed TS and Bases Changes - 2 |
| | * Revise SR 3.8.1.10 Bases: |
| | Note 3 is provided to allow D2 DG to be OPERABLE without requiring the 12 Battery Charger to be energized until completion of the Unit 1 2011 refueling outage. |
| | |
| | Battery Charger Modification - 1 |
| | * Battery Charger Study options (October 2010): |
| | : 1. SI contact |
| | : 2. New chargers |
| | : 3. C&D Technologies, Inc. battery charger control modification |
| | : 4. Low voltage relay control modification |
| | : 5. Charger output based control modification |
| | |
| | Battery Charger Modification - 2 |
| | * Selected modifications 1 and 4 |
| | - Most viable |
| | - Equipment external to chargers |
| | - Opening/closing power supply breaker to charger based on charger input voltage |
| | - Automatic shedding and repowering of the chargers |
| | * NSPM approved modification concept |
| | - Early December 2010 |
| | |
| | Battery Charger Modification - 3 |
| | * PBNP Ametek SCI charger |
| | - Not susceptible to the C&D charger lockup |
| | - Identified late December 2010 |
| | - Could meet PINGP performance requirements |
| | - Would not meet PINGP seismic and physical dimension requirements |
| | |
| | Battery Charger Modification - 4 |
| | * VEGP Ametek SCI charger |
| | - Identified during reviews with Ametek |
| | - Meets PINGP design and performance requirements |
| | - Procure on expedited schedule |
| | |
| | Battery Charger Modification - 5 |
| | * Internal control features of the Ametek SCI chargers |
| | - Not susceptible to conditions which cause PINGP charger lockup |
| | - Internal control relay |
| | - Prevent back feeding control circuit board |
| | - Relay senses incoming AC line voltage |
| | * Shut off charger - AC voltage below relay dropout setpoint |
| | * Restart charger - voltage returns above pickup setpoint |
| | - Instantaneous shutoff |
| | - Time delay on reset - a few seconds |
| | |
| | Battery Charger Modification - 6 |
| | * PBNP prototype Ametek battery charger testing |
| | - PINGP has known voltage variations outside nameplate rating |
| | - Informational testing January 2011 |
| | - Confirm engineering design review of the control circuit operation |
| | - Equipped with internal control function |
| | - Demonstrate charger capabilities, operation, shutdown, and automatic restart during anticipated voltage transients outside the nameplate rating of the chargers. |
| | |
| | Battery Charger Modification - 7 |
| | * Factory Acceptance Testing (April 2011) |
| | - Per Ametek quality assurance program |
| | - Specified in NSPM purchase order |
| | - Formal documentation of charger capabilities |
| | * shut off and reset setpoints |
| | * time delays |
| | * other operating requirements |
| | |
| | Battery Charger Modification - 8 |
| | * Ametek SCI battery charger controls accommodate AC input voltage variations |
| | * SR 3.8.1.10 footnote specifically states |
| | - modification will be installed to automatically shed and repower the 12 Battery Charger from its bus |
| | * SR 3.8.1.10 footnote requires revision to allow installation of the Ametek SCI battery charger |
| | |
| | Battery Charger Modification - 9 |
| | * Schedule Milestones |
| | - Issue Ametek contract for Unit 1 chargers |
| | - Unit 1 30% EC Design Review meeting |
| | - Unit 1 90% EC Design Review meeting |
| | - Battery charger shipped to PINGP |
| | - Start Unit 1 2011 outage |
| | - Unit 1 outage installation and post-modification testing |
| | - Unit 1 integrated SI test |
| | |
| | Basis for Alternative Modification - 1 |
| | * Battery charger considerations: |
| | - Required logic internal to charger |
| | - Modification performed in controlled shop environment |
| | - Testing performed in advance of installation |
| | |
| | Basis for Alternative Modification - 2 |
| | * Plant design considerations: |
| | - Simpler design |
| | - Spare breaker on Bus 16 preserved |
| | - Maintenance sources at the 480V level preserved |
| | - Relay setting or logic design coordination not required |
| | |
| | Basis for Alternative Modification - 3 |
| | * Plant modification considerations: |
| | - Simpler installation |
| | - Focus Engineering and procurement resources |
| | - Reduces procurement risk |
| | - Avoid: |
| | * new power cable installation |
| | * fire penetration work when routing new cables |
| | * additions to the load sequencer cabinets |
| | - Reduces outage work time and outage testing time |
| | |
| | Requested Schedule Basis - 1 |
| | * Refueling outage schedule |
| | * Request review and approval by May 6, 2011 |
| | * Current footnote specifies resolution by end of Unit 1 2011 refueling outage |
| | - Testing performed after modification |
| | |
| | Requested Schedule Basis - 2 |
| | * Battery charger replacement decision January 2011 |
| | * LAR submitted approximately one week after decision |
| | |
| | RAI discussion - 1 |
| | : 1. Provide a comparison of the major electrical parameters including the minimum voltage requirement of the alternating current (AC) input breaker, drop out, reset for the existing and proposed new battery chargers. Discuss in detail the electrical parameters for the proposed new charger that are different than the existing 12 charger and how these parameters were determined to be acceptable. |
| | : 2. Discuss whether the description of existing and new battery chargers will be provided in a future revision of the PINGP Updated Final Safety Analysis Report (UFSAR). |
| | : 3. Confirm that the proposed new battery charger can recharge its associated battery to the fully charged state within 24 hours while supplying its normal loads after a battery discharge to the bounding design basis event discharge state in accordance with PINGP UFSAR Section 8.5.3 and Technical Specification Surveillance Requirement 3.8.4.2. |
| | |
| | RAI discussion - 2 |
| | : 4. Industry operating experience has shown that momentary overvoltage or undervoltage transients experienced during switching, fault or lightning-related perturbations can trigger a self-protecting lockout feature in battery chargers resulting in disabling the chargers. Provide details on the magnitude and duration of transient and sustained overvoltage/undervoltage conditions resulting from grid perturbations (or the emergency diesel generator system) that have been evaluated for operation of the proposed battery charger. |
| | : 5. Technical Specification SR 3.8.1.10 NOTE 3 states that the 12 Battery Charger is not required to be energized during performance of SR 3.8.1.10(c) until the completion of Unit 1 2011 refueling outage. The license amendment request proposes a footnote stating that the battery charger equipment will be modified during or prior to the Unit 1 2011 refueling outage. State why NOTE 3 was not modified to apply only until the new equipment has been installed and tested. |
| | |
| | RAI discussion - 3 |
| | * Proposed response schedule |
| | - Two weeks from receipt of letter |
| | |
| | Summary |
| | * TS require 12 Battery Charger modification during Unit 1 2011 refueling outage |
| | * Battery charger replacement modification assures battery charger function performed |
| | - does not involve shedding per TS footnote |
| | * This LAR proposes to revise footnote to allow battery charger replacement modification |
| | * Expedited review and approval requested}} |
Letter Sequence Meeting |
|---|
|
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MONTHYEARL-PI-10-098, Exigent License Amendment Request to Modify Technical Specifications Surveillance Requirement 3.8.1.102010-10-14014 October 2010
Exigent License Amendment Request to Modify Technical Specifications Surveillance Requirement 3.8.1.10
Project stage: Request
L-PI-11-016, License Amendment Request (LAR) to Revise Surveillance Requirement (SR) Footnote in Technical Specification (TS) 3.8.1, AC Sources - Operating.2011-02-0303 February 2011
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Project stage: Request
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L-PI-11-024, Supplement to License Amendment Request (LAR) to Revise Surveillance Requirement (SR) Footnote in Technical Specification (TS) 3.8.1, AC Sources - Operating.2011-03-15015 March 2011
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Project stage: Supplement
ML1107401932011-03-22022 March 2011
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Project stage: Meeting
ML1110205512011-04-29029 April 2011
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Project stage: Approval
2011-03-15
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2024-05-07
[Table view] |
Text
NRC Meeting Revise Footnote in TS 3.8.1 March 3, 2011
Xcel Energy Participants Jon Anderson - Regulatory Affairs Manager Corey Hessen - General Manager - Engineering Thomas Roddey - Prairie Island Site Engineering Director Marcia Thompson - Project Sponsor Bob Flaaen - Plant Engineering Interface Dale Vincent - Licensing Engineer
Agenda
- Introductions -Jon Anderson
- Meeting purpose -Jon Anderson
- Scope of LAR -Jon Anderson
- LAR Background -Dale Vincent
- Proposed TS and Bases changes -Dale Vincent
- Battery Charger Modification -Marcia Thompson
- Basis for Alternative Modification -Marcia Thompson
- Requested Schedule Basis -Thomas Roddey
- RAI discussion -Dale Vincent
Meeting Goals
- Provide technical basis for battery charger modification
Scope of LAR
LAR Background -1
- 12 Battery Charger manual actions identified
- Exigent LAR October 14, 2010
LAR Background - 2
NSPM is planning a modification to the 12 Battery Charger that will automatically shed the battery charger during an undervoltage event (e.g.
LOOP, SI with LOOP or other undervoltage condition) and then repower the battery charger back on the bus within the 60 seconds required by the current TS.
LAR Background - 3
A modification will be installed during or prior to the Unit 1 2011 refueling outage to automatically shed the 12 Battery Charger from its normal bus and then automatically repower the charger from the bus within 60 seconds. Compliance with this SR will be demonstrated after implementation of the modification.
Proposed TS and Bases Changes - 1
A modification will be installed during or prior to the Unit 1 2011 refueling outage to assure the 12 Battery Charger is automatically powered from its normal bus within 60 seconds. Compliance with this SR will be demonstrated after implementation of the modification.
Proposed TS and Bases Changes - 2
Note 3 is provided to allow D2 DG to be OPERABLE without requiring the 12 Battery Charger to be energized until completion of the Unit 1 2011 refueling outage.
Battery Charger Modification - 1
- Battery Charger Study options (October 2010):
- 1. SI contact
- 2. New chargers
- 3. C&D Technologies, Inc. battery charger control modification
- 4. Low voltage relay control modification
- 5. Charger output based control modification
Battery Charger Modification - 2
- Selected modifications 1 and 4
- Most viable
- Equipment external to chargers
- Opening/closing power supply breaker to charger based on charger input voltage
- Automatic shedding and repowering of the chargers
- NSPM approved modification concept
- Early December 2010
Battery Charger Modification - 3
- Not susceptible to the C&D charger lockup
- Identified late December 2010
- Could meet PINGP performance requirements
- Would not meet PINGP seismic and physical dimension requirements
Battery Charger Modification - 4
- Identified during reviews with Ametek
- Meets PINGP design and performance requirements
- Procure on expedited schedule
Battery Charger Modification - 5
- Internal control features of the Ametek SCI chargers
- Not susceptible to conditions which cause PINGP charger lockup
- Internal control relay
- Prevent back feeding control circuit board
- Relay senses incoming AC line voltage
- Shut off charger - AC voltage below relay dropout setpoint
- Restart charger - voltage returns above pickup setpoint
- Instantaneous shutoff
- Time delay on reset - a few seconds
Battery Charger Modification - 6
- PBNP prototype Ametek battery charger testing
- PINGP has known voltage variations outside nameplate rating
- Informational testing January 2011
- Confirm engineering design review of the control circuit operation
- Equipped with internal control function
- Demonstrate charger capabilities, operation, shutdown, and automatic restart during anticipated voltage transients outside the nameplate rating of the chargers.
Battery Charger Modification - 7
- Factory Acceptance Testing (April 2011)
- Per Ametek quality assurance program
- Specified in NSPM purchase order
- Formal documentation of charger capabilities
- shut off and reset setpoints
- other operating requirements
Battery Charger Modification - 8
- Ametek SCI battery charger controls accommodate AC input voltage variations
- SR 3.8.1.10 footnote specifically states
- modification will be installed to automatically shed and repower the 12 Battery Charger from its bus
- SR 3.8.1.10 footnote requires revision to allow installation of the Ametek SCI battery charger
Battery Charger Modification - 9
- Issue Ametek contract for Unit 1 chargers
- Unit 1 30% EC Design Review meeting
- Unit 1 90% EC Design Review meeting
- Battery charger shipped to PINGP
- Start Unit 1 2011 outage
- Unit 1 outage installation and post-modification testing
- Unit 1 integrated SI test
Basis for Alternative Modification - 1
- Battery charger considerations:
- Required logic internal to charger
- Modification performed in controlled shop environment
- Testing performed in advance of installation
Basis for Alternative Modification - 2
- Plant design considerations:
- Simpler design
- Spare breaker on Bus 16 preserved
- Maintenance sources at the 480V level preserved
- Relay setting or logic design coordination not required
Basis for Alternative Modification - 3
- Plant modification considerations:
- Simpler installation
- Focus Engineering and procurement resources
- Reduces procurement risk
- Avoid:
- new power cable installation
- additions to the load sequencer cabinets
- Reduces outage work time and outage testing time
Requested Schedule Basis - 1
- Refueling outage schedule
- Request review and approval by May 6, 2011
- Current footnote specifies resolution by end of Unit 1 2011 refueling outage
- Testing performed after modification
Requested Schedule Basis - 2
- Battery charger replacement decision January 2011
- LAR submitted approximately one week after decision
RAI discussion - 1
- 1. Provide a comparison of the major electrical parameters including the minimum voltage requirement of the alternating current (AC) input breaker, drop out, reset for the existing and proposed new battery chargers. Discuss in detail the electrical parameters for the proposed new charger that are different than the existing 12 charger and how these parameters were determined to be acceptable.
- 2. Discuss whether the description of existing and new battery chargers will be provided in a future revision of the PINGP Updated Final Safety Analysis Report (UFSAR).
- 3. Confirm that the proposed new battery charger can recharge its associated battery to the fully charged state within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while supplying its normal loads after a battery discharge to the bounding design basis event discharge state in accordance with PINGP UFSAR Section 8.5.3 and Technical Specification Surveillance Requirement 3.8.4.2.
RAI discussion - 2
- 4. Industry operating experience has shown that momentary overvoltage or undervoltage transients experienced during switching, fault or lightning-related perturbations can trigger a self-protecting lockout feature in battery chargers resulting in disabling the chargers. Provide details on the magnitude and duration of transient and sustained overvoltage/undervoltage conditions resulting from grid perturbations (or the emergency diesel generator system) that have been evaluated for operation of the proposed battery charger.
- 5. Technical Specification SR 3.8.1.10 NOTE 3 states that the 12 Battery Charger is not required to be energized during performance of SR 3.8.1.10(c) until the completion of Unit 1 2011 refueling outage. The license amendment request proposes a footnote stating that the battery charger equipment will be modified during or prior to the Unit 1 2011 refueling outage. State why NOTE 3 was not modified to apply only until the new equipment has been installed and tested.
RAI discussion - 3
- Proposed response schedule
- Two weeks from receipt of letter
Summary
- TS require 12 Battery Charger modification during Unit 1 2011 refueling outage
- Battery charger replacement modification assures battery charger function performed
- does not involve shedding per TS footnote
- This LAR proposes to revise footnote to allow battery charger replacement modification
- Expedited review and approval requested
