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| number = ML15236A134
| number = ML15236A134
| issue date = 08/26/2015
| issue date = 08/26/2015
| title = Presentation Slides for Public Meeting with Arizona Public Service Generic Letter 2004-02 for Palo Verde Nuclear Generating Station, Units 1, 2, and 3 (TAC Nos. MC4702, MC4703, and MC4704)
| title = Presentation Slides for Public Meeting with Arizona Public Service Generic Letter 2004-02 for Palo Verde Nuclear Generating Station, Units 1, 2, and 3
| author name = Watford M M
| author name = Watford M
| author affiliation = NRC/NRR/DORL/LPLIV-1
| author affiliation = NRC/NRR/DORL/LPLIV-1
| addressee name = Edington R K
| addressee name = Edington R
| addressee affiliation = Arizona Public Service Co
| addressee affiliation = Arizona Public Service Co
| docket = 05000528, 05000529, 05000530
| docket = 05000528, 05000529, 05000530
| license number = NPF-041, NPF-051, NPF-074
| license number = NPF-041, NPF-051, NPF-074
| contact person = Watford M M
| contact person = Watford M
| case reference number = TAC MC4702, TAC MC4703, TAC4704
| case reference number = TAC MC4702, TAC MC4703, TAC4704
| document type = Meeting Briefing Package/Handouts, Slides and Viewgraphs
| document type = Meeting Briefing Package/Handouts, Slides and Viewgraphs
Line 18: Line 18:


=Text=
=Text=
{{#Wiki_filter:Palo Verde Nuclear Generating Station Generic Letter 2004-02August 26 th , 2015 IntroductionsTom Weber Department LeaderNuclear Regulatory Affairs  
{{#Wiki_filter:Palo Verde Nuclear Generating Station Generic Letter 2004-02 August 26th, 2015
 
===Introductions===
Tom Weber Department Leader Nuclear Regulatory Affairs


===Background===
===Background===
*12/18/2013 -APS submitted Revision 2 to Supplemental Response to NRC Generic Letter  
* 12/18/2013 - APS submitted Revision 2 to Supplemental Response to NRC Generic Letter 2004-02
* 4/15/2015 - PVAR 4644513 documents that APS failed to identify and evaluate Microtherm on the Reactor Vessel
* 6/10/2015 - Initial Public Meeting with NRC
    - Beaver Valley Operating Experience with Microtherm
    - Communication with the Industry
    - Industry Testing of Microporous Insulation
    - Extent of Condition 3


2004-02*4/15/2015 -PVAR 4644513 documents that APS failed to identify and evaluate Microtherm on the Reactor Vessel
*6/10/2015 -Initial Public Meeting with NRC
-Beaver Valley Operating Experience with Microtherm
-Communication with the Industry
-Industry Testing of Microporous Insulation
-Extent of Condition 3
Microtherm Locations 4
Microtherm Locations 4
Break LocationsLimiting Break Location Steam Generator Hot Leg NozzleReactor Pressure Vessel (RPV) Nozzle break locations 5
Extent of ConditionRed: Temp-Mat Impacting Existing Break Location(SG HL Nozzle) 6Green: Temp-Mat Impacting New RPV Break LocationLOCATIONUnit 1Unit 2Unit 3Cold Leg 1A, 1B, 2A, 2B RTDXXXBelow RPV NozzleXXXRPV CavityXXX RPV ICIsXXXCrossover 1A, 1B, 2A, 2B RCP Nozzle XCrossover 1A, 1B, 2A, 2B SG Nozzle XCold Leg 1A, 1B, 2A, 2B RPV Elbow X Unit 3 Only Analysis to date
*Debris Generation
-Primary success path is removal of Temp-Mat in the D-rings for current limiting break
-Microtherm ZOI (zone of influence) based on robustness of


encapsulation
Break Locations Reactor Pressure Vessel (RPV) Nozzle break locations Limiting Break Location Steam Generator Hot Leg Nozzle 5
-Encapsulated Microtherm ZOI and restrained separation of pipe at RPV nozzle break limits Microtherm quantity to the local region of the break location
 
*Debris Transport
Extent of LOCATION              Unit 1 Unit 2    Unit 3 Cold Leg 1A, 1B, 2A, 2B RTD          X      X        X Below RPV Nozzle                    X      X        X Condition RPV Cavity RPV ICIs Crossover 1A, 1B, 2A, 2B RCP X
-RPV nozzle break -Temp-Mat generated to the Reactor Cavity will not transport to strainers based on very low flow velocity and upward vertical flow path of 18 to 23 feet
X X
*Cold Leg RPV Elbow Temp-Mat is still being analyzed for impact (Unit 3 Only)
X X
-Generated Microtherm assumed to transport to the strainers 7
X Nozzle                                                X Crossover 1A, 1B, 2A, 2B SG Nozzle                    X Cold Leg 1A, 1B, 2A, 2B RPV Elbow                    X Red: Temp-Mat Impacting Existing Break Location (SG HL Nozzle)
Analysis to date (cont)*Industry Testing / NPSH
Green: Temp-Mat Impacting New RPV Break Location Unit 3 Only 6
-Salem U2 Test 6 Head Loss conditions (with Min-K) bound Palo Verde with Microtherm for post-LOCA flow scenarios
 
-Comparative analysis indicates Palo Verde NPSH and structural limits should be bounded by existing SG HL Break location 8
Analysis to date
Actions to finalize
* Debris Generation
*Confirm Removal of Temp-Mat from D-ring
    - Primary success path is removal of Temp-Mat in the D-rings for current limiting break
*Confirm Removal of Temp-Mat from Unit 3 RPV Cold Leg Elbows
    - Microtherm ZOI (zone of influence) based on robustness of encapsulation
*Confirm impact of identified Temp-Mat and
    - Encapsulated Microtherm ZOI and restrained separation of pipe at RPV nozzle break limits Microtherm quantity to the local region of the break location
* Debris Transport
    - RPV nozzle break - Temp-Mat generated to the Reactor Cavity will not transport to strainers based on very low flow velocity and upward vertical flow path of 18 to 23 feet
* Cold Leg RPV Elbow Temp-Mat is still being analyzed for impact (Unit 3 Only)
    - Generated Microtherm assumed to transport to the strainers 7


Microtherm for RPV on chemical effects
Analysis to date        (cont)
*Finalize LPSI pump failure to trip after Recirculation Actuation Signal (RAS)  
* Industry Testing / NPSH
    - Salem U2 Test 6 Head Loss conditions (with Min-K) bound Palo Verde with Microtherm for post-LOCA flow scenarios
    - Comparative analysis indicates Palo Verde NPSH and structural limits should be bounded by existing SG HL Break location 8


Scenario*Complete final review of assessment  
Actions to finalize
* Confirm Removal of Temp-Mat from D-ring
* Confirm Removal of Temp-Mat from Unit 3 RPV Cold Leg Elbows
* Confirm impact of identified Temp-Mat and Microtherm for RPV on chemical effects
* Finalize LPSI pump failure to trip after Recirculation Actuation Signal (RAS)
Scenario
* Complete final review of assessment report 9


report 9 Summary*A resolution path exists for D-ring and RPV nozzle break cases
Summary
-Confirmation of chemical effects and LPSI flow scenario items in process
* A resolution path exists for D-ring and RPV nozzle break cases
-Open Strainer Area is expected to be comparable  
      - Confirmation of chemical effects and LPSI flow scenario items in process
      - Open Strainer Area is expected to be comparable with original analysis
* Confirm removal of Temp-Mat in D-Ring
      - Removal of RTD Temp-Mat (all 3 units)
      - Removal of Crossover Piping Temp-Mat in Unit 3
* Confirm removal of Cold Leg RPV Elbows in Unit 3
* Supplement APS Response to GL 2004-02 10


with original analysis
We SAFELY and efficiently generate electricity for the long term 11}}
*Confirm removal of Temp-Mat in D-Ring
-Removal of RTD Temp-Mat (all 3 units)
-Removal of Crossover Piping Temp-Mat in Unit 3
*Confirm removal of Cold Leg RPV Elbows in Unit 3 *Supplement APS Response to GL 2004-02 10 11We SAFELY and efficientlygenerate electricity for the long term}}

Latest revision as of 10:47, 19 March 2020

Presentation Slides for Public Meeting with Arizona Public Service Generic Letter 2004-02 for Palo Verde Nuclear Generating Station, Units 1, 2, and 3
ML15236A134
Person / Time
Site: Palo Verde  Arizona Public Service icon.png
Issue date: 08/26/2015
From: Watford M
Plant Licensing Branch IV
To: Edington R
Arizona Public Service Co
Watford M
References
TAC MC4702, TAC MC4703, TAC4704
Download: ML15236A134 (11)
v • d • e


Text

Palo Verde Nuclear Generating Station Generic Letter 2004-02 August 26th, 2015

Introductions

Tom Weber Department Leader Nuclear Regulatory Affairs

Background

  • 4/15/2015 - PVAR 4644513 documents that APS failed to identify and evaluate Microtherm on the Reactor Vessel
  • 6/10/2015 - Initial Public Meeting with NRC

- Beaver Valley Operating Experience with Microtherm

- Communication with the Industry

- Industry Testing of Microporous Insulation

- Extent of Condition 3

Microtherm Locations 4

Break Locations Reactor Pressure Vessel (RPV) Nozzle break locations Limiting Break Location Steam Generator Hot Leg Nozzle 5

Extent of LOCATION Unit 1 Unit 2 Unit 3 Cold Leg 1A, 1B, 2A, 2B RTD X X X Below RPV Nozzle X X X Condition RPV Cavity RPV ICIs Crossover 1A, 1B, 2A, 2B RCP X

X X

X X

X Nozzle X Crossover 1A, 1B, 2A, 2B SG Nozzle X Cold Leg 1A, 1B, 2A, 2B RPV Elbow X Red: Temp-Mat Impacting Existing Break Location (SG HL Nozzle)

Green: Temp-Mat Impacting New RPV Break Location Unit 3 Only 6

Analysis to date

  • Debris Generation

- Primary success path is removal of Temp-Mat in the D-rings for current limiting break

- Microtherm ZOI (zone of influence) based on robustness of encapsulation

- Encapsulated Microtherm ZOI and restrained separation of pipe at RPV nozzle break limits Microtherm quantity to the local region of the break location

  • Debris Transport

- RPV nozzle break - Temp-Mat generated to the Reactor Cavity will not transport to strainers based on very low flow velocity and upward vertical flow path of 18 to 23 feet

  • Cold Leg RPV Elbow Temp-Mat is still being analyzed for impact (Unit 3 Only)

- Generated Microtherm assumed to transport to the strainers 7

Analysis to date (cont)

  • Industry Testing / NPSH

- Salem U2 Test 6 Head Loss conditions (with Min-K) bound Palo Verde with Microtherm for post-LOCA flow scenarios

- Comparative analysis indicates Palo Verde NPSH and structural limits should be bounded by existing SG HL Break location 8

Actions to finalize

  • Confirm Removal of Temp-Mat from D-ring
  • Confirm Removal of Temp-Mat from Unit 3 RPV Cold Leg Elbows
  • Confirm impact of identified Temp-Mat and Microtherm for RPV on chemical effects
  • Finalize LPSI pump failure to trip after Recirculation Actuation Signal (RAS)

Scenario

  • Complete final review of assessment report 9

Summary

  • A resolution path exists for D-ring and RPV nozzle break cases

- Confirmation of chemical effects and LPSI flow scenario items in process

- Open Strainer Area is expected to be comparable with original analysis

  • Confirm removal of Temp-Mat in D-Ring

- Removal of RTD Temp-Mat (all 3 units)

- Removal of Crossover Piping Temp-Mat in Unit 3

  • Confirm removal of Cold Leg RPV Elbows in Unit 3

We SAFELY and efficiently generate electricity for the long term 11

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