ML13197A095: Difference between revisions
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{{#Wiki_filter:Implementation of STAR Program and Replacement of the 2/3 Cycle MTC Measurement Pre-Submittal Presentation to the NRC Date: 07/11/2013 | {{#Wiki_filter:Implementation of STAR Program and Replacement of the 2/3 Cycle MTC Measurement Pre-Submittal Presentation to the NRC Date: 07/11/2013 | ||
Purpose Present and discuss with the NRC planned licensing changes | Purpose | ||
* Present and discuss with the NRC planned licensing changes | |||
- Implementation of the Startup Testing Activity Reduction (STAR) Program at PVNGS | |||
Topics STAR Replacement of the 2/3 Cycle MTC Measurement Licensing Approach Conclusion and Discussion 3 | - Replacement of the 2/3 Cycle Moderator Temperature Coefficient (MTC) Measurement 2 | ||
STAR Objectives | |||
Topics | |||
* STAR | |||
STAR Overview -Approved by NRC in WCAP | * Replacement of the 2/3 Cycle MTC Measurement | ||
-16011-P-A Participating plants only Successfully implemented at 8 CE units | * Licensing Approach | ||
* Conclusion and Discussion 3 | |||
-Operational Checks New Beginning of Cycle (BOC) Hot Zero Power (HZP) MTC surveillance methodology Applicability Requirements | |||
STAR | |||
STAR Current Methodology | * Objectives | ||
- Alternate method to validate core design | |||
- Minimize the time the plant is in an abnormal configuration 4 | |||
-001 -Unit 1 LER 2011 | |||
-005 -Measure ITC at HZP with use of reactivity computer | STAR | ||
* Overview | |||
STAR Proposed Methodology (cont.) | - Approved by NRC in WCAP-16011-P-A | ||
* Participating plants only | |||
STAR Applicability Requirements | * Successfully implemented at 8 CE units | ||
- Incorporated into Improved Standard TS | |||
-4 of WCAP-16011-P-A -Compliance evaluated on a reload cycle | * NUREG-1432, Rev 4 | ||
-specific basis | * TSTF 486 5 | ||
STAR | |||
* Overview | |||
- Adds | |||
* Credits Pre-Operational Checks | |||
* New Beginning of Cycle (BOC) Hot Zero Power (HZP) MTC surveillance methodology | |||
* Applicability Requirements | |||
- Replaces | |||
* BOC HZP Isothermal Temperature Coefficient (ITC) Measurement 6 | |||
-P-A approach | * CEA Worth Measurement | ||
-1997 Identify set of core problems | STAR | ||
* Current Methodology | |||
- CEA worth measurement | |||
* Require operation outside the normal TS LCOs | |||
-P-A approach (cont.) | * Presents operational challenges | ||
- Unit 3 LER 2012-001 | |||
- Unit 1 LER 2011-005 | |||
15 STAR PVNGS Application | - Measure ITC at HZP with use of reactivity computer 7 | ||
STAR | |||
* Proposed Methodology | |||
- Replacement of CEA Worth Measurements | |||
* Use applicability requirements | |||
* Replacement will reduce the occurrence of problems associated with testing and minimize time in abnormal operating configuration 8 | |||
17 Replacement of 2/3 Cycle MTC Measurement Objective -To replace the 2/3 cycle MTC measurement with alternate verification Overview -Approved for all CE plants in CE NPSD | |||
-911-A and Amendment 1 | STAR | ||
-A (TSTF 406) | * Proposed Methodology (cont.) | ||
- Alternate MTC verification | |||
* Adjust predicted HZP MTC based on measured Critical Boron | |||
* Increase availability of the control channels | |||
* Align PVNGS with Improved Standard TS 9 | |||
STAR | |||
* Applicability Requirements | |||
Add note allowing use of alternate BOC HZP MTC surveillance method (TSTF 486) | - Found in Table 3-4 of WCAP-16011-P-A | ||
- Compliance evaluated on a reload cycle-specific basis | |||
Add note allowing replacement of 2/3 cycle at power MTC Measurement (CE | - STAR only applied to cycles when compliance verified | ||
-NPSD-911 & TSTF 406) | - Maintain the effectiveness of the STAR Program in problem identification 10 | ||
STAR | |||
* Applicability Requirements (cont.) | |||
- Core design methods have a defined set of uncertainties based on a benchmark of predictions to actual plant measurements | |||
- Core, fuel, CEA design are similar to that of a benchmarked core | |||
- Cycle specific predictions independently verified by | |||
* Comparison of 2 independent neutronics codes 11 | |||
STAR | |||
* Applicability Requirements (cont.) | |||
- Implementation of CEA Lifetime Program | |||
* Limit CEA life within operation experience base | |||
- Pre-operational checks verify core and CEA loading are consistent with design | |||
- CEA Coupling checks performed during reactor restack | |||
* Many favorable PVNGS unique design feature 12 | |||
STAR | |||
* Benefits | |||
- Minimize the time the plant is in an abnormal operating configuration | |||
- Increase the availability of the control channels | |||
- Operationally focused improvement 13 | |||
STAR | |||
* WCAP 16011-P-A approach | |||
- Compare STAR Program to Generic Program | |||
* Generic Program based on ANSI/ANS 19.6.1-1997 | |||
* Identify set of core problems | |||
- Design Predictions | |||
- As-Built Core | |||
- Test Performance 14 | |||
STAR | |||
* WCAP 16011-P-A approach (cont.) | |||
- Concluded STAR Program is as effective in detecting the Problems as the Generic Program | |||
- STAR is an NRC approved and implemented alternative to current testing methodology. | |||
15 | |||
STAR | |||
* PVNGS Application | |||
- Compared | |||
* Design differences between PVNGS and original participating plants | |||
* Differences in current PVNGS startup program and Generic Program | |||
* Operating Experience since original STAR | |||
- NRC and INPO | |||
- PVNGS | |||
- Implementing plants 16 | |||
STAR | |||
* Results of Evaluations | |||
- Contained in plant specific justification | |||
- CASMO/SIMULATE as applied at PVNGS is acceptable for STAR | |||
- The PVNGS STAR Program is as effective as the approved STAR Program and is an acceptable alternative to the current PVNGS startup testing program. | |||
17 | |||
Replacement of 2/3 Cycle MTC Measurement | |||
* Objective | |||
- To replace the 2/3 cycle MTC measurement with alternate verification | |||
* Overview | |||
- Approved for all CE plants in CE NPSD-911-A and Amendment 1-A (TSTF 406) | |||
- No measurement at 2/3 cycle if 40 EFPD measurement is within acceptance criteria 18 - Already implemented at many PWRs | |||
Replacement of 2/3 Cycle MTC Measurement | |||
* Current Topical only applicable for ROCS | |||
& ANC | |||
* PVNGS will demonstrate applicability of SIMULATE | |||
* Conclusions | |||
- SIMULATE is acceptable for use | |||
- Replacement of the 2/3 cycle MTC measurement is acceptable at PVNGS including 19 STAR Cycles | |||
Licensing Approach | |||
* Submit one LAR | |||
- Application of STAR to PVNGS | |||
- Replacement of 2/3 cycle MTC Measurement 20 | |||
Licensing Approach | |||
* Technical Specification 3.1.4 MTC | |||
- SR 3.1.4.1 (HZP verification) | |||
* Add note allowing use of alternate BOC HZP MTC surveillance method (TSTF 486) | |||
- SR 3.1.4.2 (At power verifications) | |||
* Add note allowing replacement of 2/3 cycle at power MTC Measurement (CE-NPSD-911 & TSTF 406) 21 | |||
Licensing Approach | |||
* Proposed Schedule | |||
- Submit November 2013 | |||
- Requesting NRC Approval in November 2014 | |||
- First use in Spring of 2015 22 | |||
Conclusion and Discussion | |||
* Acceptable to implement the STAR Program at PVNGS | |||
* Acceptable to replace the 2/3 cycle at power MTC measurement | |||
* Submit both under a single LAR November 2013 | |||
* Requesting NRC approval November 2014 23}} |
Latest revision as of 16:58, 4 November 2019
ML13197A095 | |
Person / Time | |
---|---|
Site: | Palo Verde |
Issue date: | 07/11/2013 |
From: | Arizona Public Service Co |
To: | Division of Operating Reactor Licensing |
Rankin J | |
References | |
TAC MF1932, TAC MF1933, TAC MF1934 | |
Download: ML13197A095 (23) | |
Text
Implementation of STAR Program and Replacement of the 2/3 Cycle MTC Measurement Pre-Submittal Presentation to the NRC Date: 07/11/2013
Purpose
- Present and discuss with the NRC planned licensing changes
- Implementation of the Startup Testing Activity Reduction (STAR) Program at PVNGS
- Replacement of the 2/3 Cycle Moderator Temperature Coefficient (MTC) Measurement 2
Topics
- Replacement of the 2/3 Cycle MTC Measurement
- Licensing Approach
- Conclusion and Discussion 3
- Objectives
- Alternate method to validate core design
- Minimize the time the plant is in an abnormal configuration 4
- Overview
- Approved by NRC in WCAP-16011-P-A
- Participating plants only
- Successfully implemented at 8 CE units
- Incorporated into Improved Standard TS
- NUREG-1432, Rev 4
- TSTF 486 5
- Overview
- Adds
- Credits Pre-Operational Checks
- New Beginning of Cycle (BOC) Hot Zero Power (HZP) MTC surveillance methodology
- Applicability Requirements
- Replaces
- CEA Worth Measurement
- Current Methodology
- CEA worth measurement
- Require operation outside the normal TS LCOs
- Presents operational challenges
- Unit 3 LER 2012-001
- Unit 1 LER 2011-005
- Measure ITC at HZP with use of reactivity computer 7
- Proposed Methodology
- Replacement of CEA Worth Measurements
- Use applicability requirements
- Replacement will reduce the occurrence of problems associated with testing and minimize time in abnormal operating configuration 8
- Proposed Methodology (cont.)
- Alternate MTC verification
- Adjust predicted HZP MTC based on measured Critical Boron
- Increase availability of the control channels
- Align PVNGS with Improved Standard TS 9
- Applicability Requirements
- Found in Table 3-4 of WCAP-16011-P-A
- Compliance evaluated on a reload cycle-specific basis
- STAR only applied to cycles when compliance verified
- Maintain the effectiveness of the STAR Program in problem identification 10
- Applicability Requirements (cont.)
- Core design methods have a defined set of uncertainties based on a benchmark of predictions to actual plant measurements
- Core, fuel, CEA design are similar to that of a benchmarked core
- Cycle specific predictions independently verified by
- Comparison of 2 independent neutronics codes 11
- Applicability Requirements (cont.)
- Implementation of CEA Lifetime Program
- Limit CEA life within operation experience base
- Pre-operational checks verify core and CEA loading are consistent with design
- CEA Coupling checks performed during reactor restack
- Many favorable PVNGS unique design feature 12
- Benefits
- Minimize the time the plant is in an abnormal operating configuration
- Increase the availability of the control channels
- Operationally focused improvement 13
- WCAP 16011-P-A approach
- Compare STAR Program to Generic Program
- Generic Program based on ANSI/ANS 19.6.1-1997
- Identify set of core problems
- Design Predictions
- As-Built Core
- Test Performance 14
- WCAP 16011-P-A approach (cont.)
- Concluded STAR Program is as effective in detecting the Problems as the Generic Program
- STAR is an NRC approved and implemented alternative to current testing methodology.
15
- PVNGS Application
- Compared
- Design differences between PVNGS and original participating plants
- Differences in current PVNGS startup program and Generic Program
- Operating Experience since original STAR
- NRC and INPO
- PVNGS
- Implementing plants 16
- Results of Evaluations
- Contained in plant specific justification
- CASMO/SIMULATE as applied at PVNGS is acceptable for STAR
- The PVNGS STAR Program is as effective as the approved STAR Program and is an acceptable alternative to the current PVNGS startup testing program.
17
Replacement of 2/3 Cycle MTC Measurement
- Objective
- To replace the 2/3 cycle MTC measurement with alternate verification
- Overview
- Approved for all CE plants in CE NPSD-911-A and Amendment 1-A (TSTF 406)
- No measurement at 2/3 cycle if 40 EFPD measurement is within acceptance criteria 18 - Already implemented at many PWRs
Replacement of 2/3 Cycle MTC Measurement
- Current Topical only applicable for ROCS
& ANC
- PVNGS will demonstrate applicability of SIMULATE
- Conclusions
- SIMULATE is acceptable for use
- Replacement of the 2/3 cycle MTC measurement is acceptable at PVNGS including 19 STAR Cycles
Licensing Approach
- Submit one LAR
- Application of STAR to PVNGS
- Replacement of 2/3 cycle MTC Measurement 20
Licensing Approach
- SR 3.1.4.1 (HZP verification)
- SR 3.1.4.2 (At power verifications)
- Add note allowing replacement of 2/3 cycle at power MTC Measurement (CE-NPSD-911 & TSTF 406) 21
Licensing Approach
- Proposed Schedule
- Submit November 2013
- Requesting NRC Approval in November 2014
- First use in Spring of 2015 22
Conclusion and Discussion
- Acceptable to replace the 2/3 cycle at power MTC measurement
- Submit both under a single LAR November 2013
- Requesting NRC approval November 2014 23