L-2022-110, License Amendment Request 276, Revise Fire Protection Program in Support of Reactor Coolant Pump Seal Replacement Project (Non-Proprietary)

License Amendment Request 276, Revise Fire Protection Program in Support of Reactor Coolant Pump Seal Replacement Project (Non-Proprietary)

ML22243A163
Person / Time
Site:	Turkey Point
Issue date:	08/26/2022
From:	Florida Power & Light Co
To:	Office of Nuclear Reactor Regulation
Shared Package
ML22243A161	List: L-2022-110, License Amendment Request 276, Revise Fire Protection Program in Support of Reactor Coolant Pump Seal Replacement Project (Non-Proprietary) ML22243A162
References
L-2022-110
Download: ML22243A163 (177)

Text

Turkey Point Nuclear Plant L-2022-110 Docket Nos. 50-250 and 50-251 to Enclosure Turkey Point Nuclear Plant Unit 3 and Unit 4 License Amendment Request 276, Revise Fire Protection Program in Support of Reactor Coolant Pump Seal Replacement Project ATTACHMENT 2 APPLICATION SPECIFIC FIRE PRA MODEL TO SUPPORT LAR AMENDMENT FOR REPLACEMENT OF RCP SEALS AT TURKEY POINT UNITS 3 AND 4 (NON-PROPRIETARY VERSION)

(70 pages follow)



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Turkey Point Nuclear Plant L-2022-110 Docket Nos. 50-250 and 50-251 to Enclosure Turkey Point Nuclear Plant Unit 3 and Unit 4 License Amendment Request 276, Revise Fire Protection Program in Support of Reactor Coolant Pump Seal Replacement Project ATTACHMENT 4 PASSIVE SHUTDOWN SEAL - EVALUATION OF FAILURE TO ACTUATE FOR FRAMATOME RCP SEALS (NON-PROPRIETARY VERSION)

(28 pages follow)

20004-026 (08/12/2020)

Page 1 of 28 Framatome Inc.

Engineering Information Record Document No.:

51

- 9351505 -

000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Framatome Inc.

This document has been redacted and no longer contains Framatome Proprietary Information.

This redacted version is Non-Proprietary.

Proprietary information contained within brackets and proprietary markings have been removed.

Other than removal of proprietary information, technical content was not changed as attested to by the following individuals:

Preparer: Ricky Paugh Reviewer: Philip Opsal Approver: Jonathan Smith Signature and Date Signature and Date Signature and Date

20004-026 (08/12/2020)

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 2 Safety Related? YES NO Does this document establish design or technical requirements? YES NO Does this document contain assumptions requiring verification? YES NO Does this document contain Customer Required Format? YES NO Signature Block Name and Title/Discipline Signature P/LP, R/LR, M, A-CRF, A Date Pages/Sections Prepared/Reviewed/

Approved or Comments Garrett Snedeker, PRA Supervisor P

All Gordy Salisbury, Risk Informed Engineer R

All Ricky Paugh, Engineering Supervisor A

All Note: P/LP designates Preparer (P), Lead Preparer (LP)

M designates Mentor (M)

R/LR designates Reviewer (R), Lead Reviewer (LR)

A-CRF designates Project Manager Approver of Customer Required Format (A-CRF)

A designates Approver/RTM - Verification of Reviewer Independence Project Manager Approval of Customer References (N/A if not applicable)

Name (printed or typed)

Title (printed or typed)

Signature Date N/A GW SNEDEKER 8/12/2022 GC SALISBURY 8/12/2022 RL PAUGH 8/12/2022

20004-026 (08/12/2020)

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 3 Record of Revision Revision No.

Pages/Sections/

Paragraphs Changed Brief Description / Change Authorization 000 All Initial Release

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 4 Table of Contents Page SIGNATURE BLOCK............................................................................................................................. 2 RECORD OF REVISION....................................................................................................................... 3 LIST OF TABLES.................................................................................................................................. 5 LIST OF FIGURES................................................................................................................................ 6 LIST OF ACRONYMS............................................................................................................................ 7

1.0 INTRODUCTION

........................................................................................................................ 8 2.0 OBJECTIVE............................................................................................................................... 8 3.0 PSDS DESCRIPTION................................................................................................................ 8 3.1

[

]............................................................................................................... 9 3.2

[

]............................................................................................................. 10 3.3

[

]............................................................................................................... 10 3.4

[

]..................................................................................................... 11 3.5

[

] / PSDS Assembly............................................................................................ 12 4.0 ACTUATION OF THE PSDS.................................................................................................... 13 5.0 FAILURE MODES AND EFFECTS ANALYSIS (FMEA)........................................................... 14 5.1 Failure to Actuate Failure Modes and Effects Analysis................................................. 14 5.2 FMEA Results............................................................................................................... 20 6.0 EVALUATION OF POTENTIAL FAILURE MECHANISM OF COMPONENTS......................... 20 6.1

[

]........................................................................................ 20 6.2

[

]....................................................................................... 22 6.3

[

].......................................................................................... 22 6.4

[

]......................................................................................... 22 7.0

SUMMARY

OF PSDS FAILURE TO ACTUATE....................................................................... 23 7.1 Summary of Basic Events............................................................................................. 23

8.0 REFERENCES

......................................................................................................................... 23 APPENDIX A :

FAILURE OF PSDS TO ACTUATE FAULT TREE................................................. A-1 APPENDIX B :

HRA CALCULATOR DETAILS............................................................................... B-1

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 5 List of Tables Page Table 5-1: FMEA Table - [

]........................................................................................... 15 Table 5-2: FMEA Table - [

]........................................................................................... 16 Table 5-3: FMEA Table - [

]............................................................................................. 18 Table 7-1: Basic Event Summary........................................................................................................ 23

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 6 List of Figures Page Figure 3-1: Cross-Section View of PSDS.............................................................................................. 9 Figure 3-2: [

]....................................................................................................... 10 Figure 3-3: [

]............................................................................. 11 Figure 3-4: [

]............................................................................................. 12 Figure 3-5: [

].................................................................................................................... 12 Figure 4-1: PSDS in Inactive State...................................................................................................... 13 Figure 4-2: PSDS after Actuation........................................................................................................ 14

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 7 List of Acronyms ABWR Advanced Boiling Water Reactor AC Alternating Current CCCG Common-Cause Component Group CCF Common Cause Failure CDF Cumulative Distribution Function DMA Dynamic Mechanical Analysis DSC Differential Scanning Calorimetric

[

]

ELAP Extended Loss of AC Power EDG Emergency Diesel Generator FMEA Failure Modes and Effects Analysis FTC Failure to Close gpm Gallons per Minute HCHPF High Confidence High Probability of Failure HEP Human Error Probability HRA Human Reliability Analysis HRAC HRA Calculator LOCA Loss of Coolant Accident LOOP Loss of Off-Site Power PDF Probability Density Function

[

]

PORV Power Operated Relief Valve PRA Probabilistic Risk Assessment PSDS Passive ShutDown Seal psi Pounds per Square Inch PPM Parts per Million

[

]

PWR Pressurized Water Reactor QA Quality Assurance QC Quality Control RCP Reactor Coolant Pump SBO Station Blackout THERP Technique for Human Error-Rate Prediction

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 8

1.0 INTRODUCTION

Excessive leakage of reactor coolant pump (RCP) seals following loss of component cooling water or loss of power events can be a significant contributor to risk at nuclear power plants. This is particularly true in the event of an extended station blackout (SBO) or extended loss of alternating current (AC) power (ELAP), when the RCP seals can be exposed to high temperature and high pressure conditions for a significant period of time. To address this issue, Framatome offers a device, the Passive ShutDown Seal (PSDS), which is available as a solution to RCP seal leakage during an extended SBO.

This document presents the results of an evaluation of the failure of the PSDS to actuate during an accident scenario. The evaluation is not based on the application of the PSDS in the seal package for a particular RCP type.

2.0 OBJECTIVE The objective of this report is to assess the potential failure mechanisms that are associated with the subcomponents of the PSDS, [

]

The objective of the evaluation is to estimate a reasonable probability of the failure to actuate that can be used as part of a probabilistic risk assessment (PRA).

3.0 PSDS DESCRIPTION The PSDS is a passively-actuated mechanical seal that is designed to provide very low leakage through currently installed RCP seals in the event of ELAP. The PSDS is available pre-assembled into a #1 seal insert that can be installed with little or no modifications to existing RCP seals. The PSDS is installed as an integral portion of the existing #1 seal insert and is located upstream of the No. 1 RCP seal leak-off line. Information on the general design, components, and operation of the PSDS can be found in Reference [1, Section 5].

[

]

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 9 Figure 3-1: Cross-Section View of PSDS The PSDS is a passive device, which is not dependent on any support system, e.g., electrical power, cooling water, instrument air, etc. The following is a description of each component of the PSDS and its role in operation of the PSDS.

3.1

[

]

A drawing of a [

] is shown as Figure 3-2 [1, page 18].

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 10 Figure 3-2: [

]

3.2

[

]

3.3

[

]

A drawing of a [

] is shown as Figure 3-3 [1, pages 17, 18].

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 11 Figure 3-3: [

]

3.4

[

]

A drawing of a [

] is shown as Figure 3-4 [1, page 19].

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 12 Figure 3-4: [

]

3.5

[

] / PSDS Assembly A drawing of the [

] is shown as Figure 3-5 [1, page 17].

Figure 3-5: [

]

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 13 4.0 ACTUATION OF THE PSDS

[

]

Figure 4-1: PSDS in Inactive State

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 14 Figure 4-2: PSDS after Actuation 5.0 FAILURE MODES AND EFFECTS ANALYSIS (FMEA) 5.1 Failure to Actuate Failure Modes and Effects Analysis

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 15 Table 5-1: FMEA Table - [

]

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 16 Table 5-2: FMEA Table - [

]

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 17 Table 5-2: FMEA Table - [

] (Continued)

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 18 Table 5-3: FMEA Table - [

]

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 19 Table 5-3: FMEA Table - [

] (Continued)

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 20 5.2 FMEA Results After performing the component based FMEA for the PSDS, [

] The following failure mechanisms are discussed in additional details in the proceeding sections:

6.0 EVALUATION OF POTENTIAL FAILURE MECHANISM OF COMPONENTS 6.1

[

]

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 21

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 22 6.2

[

]

6.3

[

]

6.4

[

]

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page 23 7.0

SUMMARY

OF PSDS FAILURE TO ACTUATE 7.1 Summary of Basic Events The following table summarizes all the basic events included in the fault tree that is used to quantify the probability of the PSDS Failure to Actuate.

Table 7-1: Basic Event Summary

8.0 REFERENCES

1.

Framatome Document No. 38-9351062-000, Passive Shutdown Seal [

] for Reactor Coolant Pump [

].

2.

Framatome Document No. 58-9346852-000, Passive ShutDown Seal (PSDS) for Reactor Coolant Pump - [

] - Test Report

3.

AREVA Document No. 38-9227792-000, Dispositif dEtancheite Passif pour systeme de joints darbre des [

], Note de Synthese de Qualification (lot N1).

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page A-1 APPENDIX A:

FAILURE OF PSDS TO ACTUATE FAULT TREE The following is the fault tree developed to calculate the probability of the failure of the PSDS to actuate.

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page A-2

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page B-1 APPENDIX B:

HRA CALCULATOR DETAILS

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page B-2 PSDS-ASSEMBLY,

Document No.: 51-9351505-000 Passive Shutdown Seal - Evaluation of Failure To Actuate for Framatome RCP Seals Page B-3

Turkey Point Nuclear Plant L-2022-110 Docket Nos. 50-250 and 50-251 to Enclosure Turkey Point Nuclear Plant Unit 3 and Unit 4 License Amendment Request 276, Revise Fire Protection Program in Support of Reactor Coolant Pump Seal Replacement Project ATTACHMENT 6 PASSIVE SHUTDOWN SEAL - EVALUATION OF FAILURE TO REMAIN SEALED (NON-PROPRIETARY VERSION)

(36 pages follow)

20004-026 (08/12/2020)

Page 1 of 36 Framatome Inc.

Engineering Information Record Document No.:

51

- 9348566 -

001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Framatome Inc.

This document has been redacted and no longer contains Framatome Proprietary Information.

This redacted version is Non-Proprietary.

Proprietary information contained within brackets and proprietary markings have been removed.

Other than removal of proprietary information, technical content was not changed as attested to by the following individuals:

Preparer: Ricky Paugh Reviewer: Philip Opsal Approver: Jonathan Smith Signature and Date Signature and Date Signature and Date

20004-026 (08/12/2020)

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 2 Safety Related? YES NO Does this document establish design or technical requirements? YES NO Does this document contain assumptions requiring verification? YES NO Does this document contain Customer Required Format? YES NO Signature Block Name and Title/Discipline Signature P/LP, R/LR, M, A-CRF, A Date Pages/Sections Prepared/Reviewed/

Approved or Comments Garrett Snedeker, PRA Supervisor P

All Gordy Salisbury, Risk Informed Engineer R

All Ricky Paugh, Engineering Supervisor A

All Note: P/LP designates Preparer (P), Lead Preparer (LP)

M designates Mentor (M)

R/LR designates Reviewer (R), Lead Reviewer (LR)

A-CRF designates Project Manager Approver of Customer Required Format (A-CRF)

A designates Approver/RTM - Verification of Reviewer Independence Project Manager Approval of Customer References (N/A if not applicable)

Name (printed or typed)

Title (printed or typed)

Signature Date N/A GW SNEDEKER 8/15/2022 GC SALISBURY 8/15/2022 RL PAUGH 8/15/2022

20004-026 (08/12/2020)

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 3 Record of Revision Revision No.

Pages/Sections/

Paragraphs Changed Brief Description / Change Authorization 000 All Initial Release 001 All Minor Revision throughout

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 4 Table of Contents Page SIGNATURE BLOCK............................................................................................................................. 2 RECORD OF REVISION....................................................................................................................... 3 LIST OF TABLES.................................................................................................................................. 5 LIST OF FIGURES................................................................................................................................ 6 LIST OF ACRONYMS............................................................................................................................ 7

1.0 INTRODUCTION

........................................................................................................................ 8 2.0 OBJECTIVE............................................................................................................................... 8 3.0 PSDS DESCRIPTION................................................................................................................ 8 3.1

[

]............................................................................................................... 9 3.2

[

]............................................................................................................. 10 3.3

[

]............................................................................................................... 10 3.4

[

]..................................................................................................... 11 3.5

[

] / PSDS Assembly............................................................................................ 12 4.0 ACTUATION OF THE PSDS.................................................................................................... 13 5.0 FAILURE MODES AND EFFECTS ANALYSIS (FMEA)........................................................... 14 5.1 Failure to Actuate Failure Modes and Effects Analysis................................................. 14 5.2 FMEA Results............................................................................................................... 19 6.0 EVALUATION OF POTENTIAL FAILURE MECHANISM OF COMPONENTS......................... 19 6.1 Temperature Related Failure........................................................................................ 21 6.1.1

[

]........................................................................... 21 6.1.2

[

]........................................................................... 21 6.1.3

[

]................................................................. 21 6.2

[

].......................................................................................... 22 6.3

[

]......................................................................................... 22 6.4

[

]................................................ 23 6.5

[

]......................................................................................... 23 7.0

SUMMARY

OF PSDS FAILURE TO ACTUATE....................................................................... 24 7.1 Summary of Basic Events............................................................................................. 24

8.0 REFERENCES

......................................................................................................................... 25 APPENDIX A :

[

] TECHNICAL DATA SHEET........................... A-1 APPENDIX B :

FAILURE OF PSDS TO REMAIN SEALED FAULT TREE..................................... B-1 APPENDIX C :

HRA CALCULATOR DETAILS............................................................................... C-1

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 5 List of Tables Page Table 5-1: FMEA Table - [

]................................................................................... 15 Table 7-1: Basic Event Summary........................................................................................................ 24

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 6 List of Figures Page Figure 3-1: Cross-Section View of PSDS.............................................................................................. 9 Figure 3-2: [

]....................................................................................................... 10 Figure 3-3: [

]............................................................................. 11 Figure 3-4: [

]............................................................................................. 12 Figure 3-5: [

].................................................................................................................... 12 Figure 4-1: PSDS in Inactive State...................................................................................................... 13 Figure 4-2: PSDS after Actuation........................................................................................................ 14 Figure 6-1: Failure of PSDS To Remain Sealed Fault Tree................................................................. 20

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 7 List of Acronyms AC Alternating Current CCCG Common-Cause Component Group CCF Common Cause Failure CDF Cumulative Distribution Function DMA Dynamic Mechanical Analysis DSC Differential Scanning Calorimetric

[

]

ELAP Extended Loss of AC Power EDG Emergency Diesel Generator FMEA Failure Modes and Effects Analysis FTC Failure to Close gpm Gallons per Minute HEP Human Error Probability HRA Human Reliability Analysis HRAC HRA Calculator LOCA Loss of Coolant Accident LOOP Loss of Off-Site Power PDF Probability Density Function

[

]

PORV Power Operated Relief Valve PRA Probabilistic Risk Assessment PSDS Passive ShutDown Seal psi Pounds per Square Inch PPM Parts per Million

[

]

PWR Pressurized Water Reactor QA Quality Assurance QC Quality Control RCP Reactor Coolant Pump SBO Station Blackout THERP Technique for Human Error-Rate Prediction

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 8

1.0 INTRODUCTION

Excessive leakage of reactor coolant pump (RCP) seals following loss of component cooling water or loss of power events can be a significant contributor to risk at nuclear power plants. This is particularly true in the event of an extended station blackout (SBO) or extended loss of alternating current (AC) power (ELAP), when the RCP seals can be exposed to high temperature and high pressure conditions for a significant period of time. To address this issue, Framatome offers a device, the Passive ShutDown Seal (PSDS), which is available as a solution to RCP seal leakage during an extended SBO.

This document presents the results of an evaluation of the failure of the PSDS to remain sealed after successful actuation. The evaluation is not based on the application of the PSDS in the seal package for a particular RCP type.

2.0 OBJECTIVE The objective of this report is to assess the potential failure mechanisms that are associated [

]

The objective of the evaluation is to estimate a reasonable probability of the failure to actuate that can be used as part of a probabilistic risk assessment (PRA).

3.0 PSDS DESCRIPTION The PSDS is a passively-actuated mechanical seal that is designed to provide very low leakage through currently installed RCP seals in the event of ELAP. The PSDS is available pre-assembled into a #1 seal insert that can be installed with little or no modifications to existing RCP seals. The PSDS is installed as an integral portion of the existing #1 seal insert and is located upstream of the No. 1 RCP seal leak-off line. Information on the general design, components, and operation of the PSDS can be found in Reference [1, Section 5].

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 9 Figure 3-1: Cross-Section View of PSDS The PSDS is a passive device, which is not dependent on any support system, e.g., electrical power, cooling water, instrument air, etc. The following is a description of each component of the PSDS and its role in operation of the PSDS.

3.1

[

]

A drawing of a [

] is shown as Figure 3-2 [1, page 18].

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 10 Figure 3-2: [

]

3.2

[

]

3.3

[

]

A drawing of a [

] is shown as Figure 3-3 [1, pages 17, 18].

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 11 Figure 3-3: [

]

3.4

[

]

A drawing of a [

] is shown as Figure 3-4 [1, page 19].

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 12 Figure 3-4: [

]

3.5

[

] / PSDS Assembly A drawing of the [

] is shown as Figure 3-5 [1, page 17].

Figure 3-5: [

]

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 13 4.0 ACTUATION OF THE PSDS

[

] A schematic showing a PSDS in the inactive state is shown as Figure 4-1 [3, page 16].

Figure 4-1: PSDS in Inactive State

[

] A schematic showing a PSDS in the actuated state is shown as Figure 4-2 [3, page 16].

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 14 Figure 4-2: PSDS after Actuation 5.0 FAILURE MODES AND EFFECTS ANALYSIS (FMEA) 5.1 Failure to Actuate Failure Modes and Effects Analysis

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 15 Table 5-1: FMEA Table - [

]

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 16

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 17

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 18

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 19 5.2 FMEA Results After performing the component based FMEA for the Sealing Split Ring, [

] The following failure mechanisms are discussed in additional details in the proceeding sections:

6.0 EVALUATION OF POTENTIAL FAILURE MECHANISM OF COMPONENTS The following section describes the potential failure mechanisms of the [

]. These failures are quantified using the fault tree included in Figure 6-1. Table 7-1 summarizes the basic event probabilities and basis for the values.

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 20 Figure 6-1: Failure of PSDS To Remain Sealed Fault Tree

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 21 6.1 Temperature Related Failure 6.1.1

[

]

6.1.2

[

]

6.1.3

[

]

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 22 6.2

[

]

6.3

[

]

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 23 6.4

[

]

6.5

[

]

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 24 7.0

SUMMARY

OF PSDS FAILURE TO ACTUATE 7.1 Summary of Basic Events The following table summarizes all the basic events included in the fault tree that is used to quantify the probability of the PSDS Failure to Remain Sealed. See Appendix B for the fault tree used to quantify the failure rate of the PSDS to remain sealed.

Table 7-1: Basic Event Summary

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page 25

8.0 REFERENCES

1.

Framatome Document No. 38-9351062-000, Passive Shutdown Seal [

] for Reactor Coolant Pump [

].

2.

Framatome Document No. 58-9346852-000, Passive ShutDown Seal (PSDS) for Reactor Coolant Pump - [

] - Test Report

3.

AREVA Document No. 38-9227792-000, Dispositif dEtancheite Passif pour systeme de joints darbre des [

], Note de Synthese de Qualification (lot N1).

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page A-1 APPENDIX A: [

] TECHNICAL DATA SHEET

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page A-2

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page B-1 APPENDIX B:

FAILURE OF PSDS TO REMAIN SEALED FAULT TREE The following is the fault tree developed to calculate the probability of the failure of the PSDS to remain sealed after successful actuation.

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page B-2

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page C-1 APPENDIX C:

HRA CALCULATOR DETAILS

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page C-2 PSDS-ASSEMBLY,

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page C-3

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page C-4

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page C-5

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page C-6

Document No.: 51-9348566-001 Passive Shutdown Seal - Evaluation of Failure To Remain Sealed Page C-7

Turkey Point Nuclear Plant L-2022-110 Docket Nos. 50-250 and 50-251 to Enclosure Turkey Point Nuclear Plant Unit 3 and Unit 4 License Amendment Request 276, Revise Fire Protection Program in Support of Reactor Coolant Pump Seal Replacement Project ATTACHMENT 8 PASSIVE SHUTDOWN SEAL - EVALUATION OF SPURIOUS ACTUATION (NON-PROPRIETARY VERSION)

(38 pages follow)

20004-025 (02/27/2018)

Page 1 of 2 Framatome Inc.

Engineering Information Record Document No.:

51

- 9227814 -

004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Framatome Inc.

This document has been redacted and no longer contains Framatome Proprietary Information.

This redacted version is Non-Proprietary.

Proprietary information contained within brackets and proprietary markings have been removed.

Other than removal of proprietary information, technical content was not changed as attested to by the following individuals:

Preparer: Ricky Paugh Reviewer: Philip Opsal Approver: Jonathan Smith Signature and Date Signature and Date Signature and Date

20004-026 (08/12/2020)

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 2 Safety Related? YES NO Does this document establish design or technical requirements? YES NO Does this document contain assumptions requiring verification? YES NO Does this document contain Customer Required Format? YES NO Signature Block Name and Title/Discipline Signature P/LP, R/LR, M, A-CRF, A Date Pages/Sections Prepared/Reviewed/

Approved or Comments Ahmed Abdelnabi Engineer LP All Garrett Snedeker PRA Supervisor LR All Ricky Paugh Engineering Supervisor A

All Note: P/LP designates Preparer (P), Lead Preparer (LP)

M designates Mentor (M)

R/LR designates Reviewer (R), Lead Reviewer (LR)

A-CRF designates Project Manager Approver of Customer Required Format (A-CRF)

A designates Approver/RTM - Verification of Reviewer Independence Project Manager Approval of Customer References (N/A if not applicable)

Name (printed or typed)

Title (printed or typed)

Signature Date N/A A ABDELNABI 8/15/2022 GW SNEDEKER 8/15/2022 RL PAUGH 8/15/2022

20004-025 (02/27/2018)

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 3 Record of Revision Revision No.

Pages/Sections/

Paragraphs Changed Brief Description / Change Authorization 000 All Initial Release 001 Section 3.0 Edited text to identify location of PSDS and remove sentences associated with one of the references.

FMEA Table Changed table number.

002 Throughout document Changed Areva to Framatome.

Throughout document Individual reference locations were updated in accordance with new updated references.

Table of Contents Section page numbers are updated.

Section 1.0 Scope of document is 100A RCP.

Section 6.1.2 Table numbers and figure numbers updated.

Section 6.2 Updated service life of PSDS from [

] to twelve years [

]

Section 6.5 Estimation of spurious actuation frequency changed based on 12 year service life.

Section 7.0

[

]

Section 8.0 Updated References.

003 Throughout document Revised the document so that it encompasses Low Temperature PSDS

[

]

Throughout Document Updated References Appendix A Replaced [

] Data Sheet with a new one.

Appendix B Added Product Data Sheet for [

]

Appendix C Added Framatome QA/QC requirements for RCP Seal Parts

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 4 Table of Contents Page SIGNATURE BLOCK............................................................................................................................. 2 RECORD OF REVISION....................................................................................................................... 3 LIST OF TABLES.................................................................................................................................. 6 LIST OF FIGURES................................................................................................................................ 7 LIST OF ACRONYMS............................................................................................................................ 8

1.0 INTRODUCTION

........................................................................................................................ 9 2.0 OBJECTIVE............................................................................................................................... 9 3.0 PSDS DESCRIPTION................................................................................................................ 9 3.1

[

]............................................................................................................. 10 3.2

[

]............................................................................................................. 11 3.3

[

]............................................................................................................... 11 3.4

[

]..................................................................................................... 12 3.5

[

] / PSDS Assembly............................................................................................ 12 4.0 ACTUATION OF THE PSDS.................................................................................................... 13 5.0 FAILURE MODES AND EFFECTS ANALYSIS (FMEA)........................................................... 14 5.1 Spurious Actuation Failure Modes and Effects Analysis............................................... 14 5.2 FMEA Results............................................................................................................... 16 6.0 EVALUATION OF MECHANICAL STRESS AND STRENGTH OF [

]............ 16 6.1

[

].............................................................. 16 6.1.1

[

]...................................................................................... 16 6.1.2

[

]................................................................................... 17 6.2

[

]................................................. 19 6.3

[

]................................................................................................ 19 6.4

[

]............................................................................... 20 6.5 Result........................................................................................................................... 21 7.0 EVALUATION OF [

]................................................................................................................................ 21 7.1

[

].......................................................................................... 22 7.2

[

]...................................... 23 7.2.1

[

]............................................................................ 23 7.2.2

[

]........................................................................ 23

8.0 REFERENCES

......................................................................................................................... 24 APPENDIX A : [

] TECHNICAL DATA SHEET..................... A-1 APPENDIX B :

[

] TECHNICAL DATA SHEET.................... B-1

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Table of Contents (continued)

Page Page 5 APPENDIX C :

FRAMATOME INC. RCP SEALS QA/QC REQUIREMENTS................................. C-1 APPENDIX D :

DOCUMENTATION OF SPREADSHEET USED TO DETERMINE PDF................ D-1

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 6 List of Tables Page Table 5-1: FMEA Table - [

]........................................................................................... 15 Table 6-1: [

]................................................... 17 Table 6-2: [

]...................................................... 17 Table 7-1: [

]................................. 23

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 7 List of Figures Page Figure 3-1: PSDS Assembly View....................................................................................................... 10 Figure 3-2: [

]....................................................................................................... 11 Figure 3-3: [

]............................................................................. 11 Figure 3-4: [

]............................................................................................. 12 Figure 3-5: [

].................................................................................................................... 13 Figure 4-1: PSDS in Inactive State...................................................................................................... 13 Figure 4-2: PSDS after Actuation........................................................................................................ 14 Figure 6-1: [

]..................................... 17 Figure 6-2: [

]........................................................ 18 Figure 6-3: [

]................................................................................................................................ 19 Figure 6-4: [

]..................................... 20 Figure 6-5: [

]....... 20 Figure 7-1: [

]............................................................................................... 22

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 8 List of Acronyms AC Alternating Current CDF Cumulative Distribution Function DMA Dynamic Mechanical Analysis DSC Differential Scanning Calorimetric

[

]

ELAP Extended Loss of AC Power EDG Emergency Diesel Generator FMEA Failure Modes and Effects Analysis FTC Failure to Close gpm Gallons per Minute LOCA Loss of Coolant Accident LOOP Loss of Off-Site Power PDF Probability Density Function

[

]

PRA Probabilistic Risk Assessment PSDS Passive ShutDown Seal psi Pounds per Square Inch PPM Parts per Million

[

]

PWR Pressurized Water Reactor QA Quality Assurance QC Quality Control RCP Reactor Coolant Pump SBO Station Blackout

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 9

1.0 INTRODUCTION

Excessive leakage of reactor coolant pump (RCP) seals following loss of component cooling water or loss of power events can be a significant contributor to risk at nuclear power plants. This is particularly true in the event of an extended station blackout (SBO) or extended loss of alternative current (AC) power (ELAP), when the RCP seals can be exposed to high temperature and high-pressure conditions for a significant period of time. To address this issue, Framatome offers a device, the Passive ShutDown Seal, (PSDS), which is available as a solution to RCP seal leakage during an extended SBO or ELAP condition.

This document presents the results of an evaluation of the potential for a PSDS to spuriously actuate.

The evaluation is for the application of the PSDS in the seal package for [

]

2.0 OBJECTIVE The objective of this report is to assess the potential failure mechanisms that are associated with [

]

[

]

The objective of the evaluation is to estimate a reasonable probability (frequency) of spurious actuation that can be used as part of a probabilistic risk assessment (PRA).

3.0 PSDS DESCRIPTION The PSDS is a passively-actuated mechanical seal that is designed to provide very low leakage through currently installed RCP seals in the event of ELAP. The PSDS is available pre-assembled into a #1 seal insert that can be installed with little or no modifications to existing RCP seals. The PSDS is installed as an integral portion of the existing #1 seal insert and is located upstream of the No. 1 RCP seal leak-off line. Information on the general design, components, and operation of the PSDS can be found in Reference 2, Section 5.

[

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 10 Figure 3-1: PSDS Assembly View The PSDS is a passive device, which is not dependent on any support system, e.g., electrical power, cooling water, instrument air, etc. The following is a description of each component of the PSDS and its role in operation of the PSDS.

The PSDS comes in two models, a high temperature model, and a low temperature model. The high temperature model actuates at a higher temperature than the low temperature model. The difference in actuation temperature between the two models is due to different fuse spacer material, explained in further detail in Section 3.1.

3.1

[

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 11 A drawing of a [

] is shown as Figure 3-1, [2, page 18].

Figure 3-2: [

]

3.2

[

]

3.3

[

]

A drawing of a PSDS [

] is shown as Figure 3-2 [2, pages 17, 18].

Figure 3-3: [

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 12 3.4

[

]

A drawing of a [

] is shown as Figure 3-3 [2, page 19].

Figure 3-4: [

]

3.5

[

] / PSDS Assembly A drawing of the [

] is shown as Figure 3-4 [2, page 17].

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 13 Figure 3-5: [

]

4.0 ACTUATION OF THE PSDS

[

] A schematic showing a PSDS in the inactive state is shown as Figure 4-1 [3, page 16].

Figure 4-1: PSDS in Inactive State

[

] A schematic showing a PSDS in the actuated state is shown as Figure 4-2 [3, page 16].

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 14 Figure 4-2: PSDS after Actuation 5.0 FAILURE MODES AND EFFECTS ANALYSIS (FMEA) 5.1 Spurious Actuation Failure Modes and Effects Analysis A tabular-format FMEA for the fuser spacer was developed as shown in Table 5-1. The FMEA considered the function, possible failure modes, failure mechanisms, and possible preventative measures for spurious actuation of the PSDS due to [

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 15 Table 5-1: FMEA Table - [

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 16 5.2 FMEA Results After performing the component-based FMEA for [

]

6.0 EVALUATION OF MECHANICAL STRESS AND STRENGTH OF [

]

6.1

[

]

6.1.1

[

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 17 Figure 6-1: [

]

6.1.2

[

]

Table 6-1: [

]

Table 6-2: [

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 18 Figure 6-2: [

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 19 Figure 6-3: [

]

6.2

[

]

6.3

[

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 20 Figure 6-4: [

]

6.4

[

]

Figure 6-5: [

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 21 6.5 Result 7.0 EVALUATION OF [

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 22 Figure 7-1: [

]

7.1

[

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 23 7.2

[

]

7.2.1

[

]

Table 7-1: [

]

7.2.2

[

]

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page 24

8.0 REFERENCES

1. AREVA Document No. 58-9217959-000, Passive ShutDown Seal (PSDS) for Reactor Coolant Pump, Qualification of the [

] Test Report - Impact of the PSDS Inadvertent Actuation on the

[

]

2. Framatome Document No. 38-9217970-002, Passive ShutDown Seal (PSDS) for Reactor Coolant Pump, Qualification of the [

] - Summary Report (US Unit).

3. AREVA Document No. 38-9227792-000, Dispositif dEtancheite Passif pour systeme de joints darbre des [

], Note de Synthese de Qualification (lot N1).

4. Ichikawa, M., A Meaning of the Overlapped Area Under Probability Density Curves of Stress and Strength, Reliability Engineering and System Safety 41 (1993) 203-204.

5. AREVA Document No. 58-9217956-001, Passive ShutDown Seal (PSDS) for Reactor Coolant Pump, Qualification of the [

] Results of the Aging and Corrosion Resistance Tests on [

].

6. [

]

7. PlasticsEurope, 2005, Guide for the Safe Handling of Fluoropolymer Resins, 3rd Edition, June 2005.

8. AREVA Document No. 38-9227846-000, Vitesse de rotation de la ligne darbre en phase dactivation du dispositive (lot E1), Note dAnalyse.

9. Framatome Document No. 38-9351062-000, Turkey Point NPP units 3 & 4, Passive Shutdown Seal model [

], Qualification Report.

10. [

]

11. AREVA Document No. 58-9350783-000, Passive Shutdown Seal (PSDS) for Reactor Coolant Pump, Qualification of the [

] Report of the aging and corrosion resistance tests of the [

].

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page A-1 APPENDIX A: [

] TECHNICAL DATA SHEET

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page A-2

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page A-3

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page B-1 APPENDIX B: [

] TECHNICAL DATA SHEET

Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page B-2

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Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page C-1 APPENDIX C:

FRAMATOME INC. RCP SEALS QA/QC REQUIREMENTS

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Document No.: 51-9227814-004 Passive Shutdown Seal - PRA Evaluation of Spurious Actuation Page D-1 APPENDIX D:

DOCUMENTATION OF SPREADSHEET USED TO DETERMINE PDF

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