ML13078A250
| ML13078A250 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 03/19/2013 |
| From: | Southern Nuclear Operating Co |
| To: | Division of Operating Reactor Licensing |
| Brown E | |
| Shared Package | |
| ML13078A284 | List: |
| References | |
| Download: ML13078A250 (14) | |
Text
FNP NFPA 805 LAR Submittal Overview Overview March 19-21, 2013 Circuit Analysis
Summary
- Circuit Analysis Process and Controls A
l t Q lifi ti
- Analyst Qualifications
- Governing Analysis Criteria SC
- Analysis Methodology
- Circuit Analysis Database
- Associated Circuits Circuit Analysis Slide 2 of 14
Process and Controls
- Circuit Analysis Process Performed IAW approved procedure
- Performed IAW approved procedure
- Strict and formal analysis conventions
- Emphasis on consistency and standardization Emphasis on consistency and standardization
- Integrated PRA and NSCA requirements
- Controls Controls
- Rigidly defined Function States
- Independent verification for each analysis
- Detailed documentation in database (FDM/ARCPlus)
Circuit Analysis Slide 3 of 14
Analyst Qualifications
- All analysts formally qualified to SNC &
Contractor QUAL CARD for independent work Contractor QUAL CARD for independent work
- Internalized industry lessons learned on training, qualifications and oversight qualifications, and oversight
- Procedure and database established to force consistency consistency
Governing Criteria
- NEI 00-01, Rev.1
- Initial Work to Rev.1
- Gap analysis performed to Rev. 2 (per Generic RAI 10 and RG 1.205)
- NEI 00-01 Rev 2 NEI 00 01, Rev. 2
- Later work
- Integrated emerging PIRT issues N
dit t k f
ff h
l i
- No credit taken for off-scheme exclusions
- Included Open circuits p
Note: Integrated requirements for conservative, but universal criteria between PRA and NSCA Circuit Analysis Slide 5 of 14
- Implementing Concepts
- 95% of circuit analysis criteria for PRA and NSCA are y
the same
- Establish single dataset for criteria to assure dual use and better interface between NSCA and PRA better interface between NSCA and PRA
- Provide procedure and database flexibility to accommodate the 5% difference Long term configuration control extremely difficult if
- Long-term configuration control extremely difficult if redundant data sets are maintained
- Differences primarily handled through:
p y
g
- Use of Function States
- Interlock identification and documentation Circuit Analysis Slide 6 of 14
Analysis Methodology
- All circuit analysis drive by FUNCTION STATES
- Function States Function States
- Component + Initial State + Desired State
- Permits maximum flexibility to accommodate PRA and NSCA differences (primarily auto signals)
- Minimize false failures up front Effi i t
d l
- Efficient and less error prone
- Consistent with NUREG/CR-6850 methods for Tasks 3 & 9 3 & 9 Circuit Analysis Slide 7 of 14
Analysis Methodology, cont
- Work package development to facilitate process
- Single, controlled database (FDM)
Single, controlled database (FDM)
- Process and techniques based on NRC/EPRI training modules g
- Major Steps Prerequisites satisfied q
- Function state established
- Plant specific rules and conventions
- General classification
- General classification
- Resolve questions Circuit Analysis Slide 8 of 14
Analysis Methodology, cont
- Major Steps Work Package Development g
p
- Drawings
- Supplemental information Cable Selection Cable Selection
- All scheme cables dispositioned
- Fault codes applied to all cables
- Basis documented for excluded cables
- Selection of required cables with hot probe method
- Cables generally excluded based only on design features at Cables generally excluded based only on design features at this stage (NUREG/CR-6850 concept)
Circuit Analysis Slide 9 of 14
Analysis Methodology, cont
- Major Steps Power Supply Identification pp y
- All Power Supplies identified
- Required and not-required determined based on Function State requirements State requirements
- Sensitive to alternate PS lineups and how they are credited Dependencies & Interlocks
- All circuit interlocks formally dispositioned
- Equipment dependencies established or off-scheme cables directly incorporated
- Differentiate auto functions so NSCA and PRA can apply as credited by Basic Event Circuit Analysis Slide 10 of 14
Analysis Methodology, cont
- Major Steps Documentation
- Controlled database, with individual analysis originate and check sign-offs
- Reference drawing Reference drawing
- Final calculation for circuit analysis and PRA Notebook Circuit Analysis Slide 11 of 14
Circuit Analysis Database Circuit Analysis Slide 12 of 14
Associated Circuits
- Electrical Coordination
- Consolidated calculation
- Common Enclosure
- Addresses secondary fire concerns
- Addresses loss of DC control power to Switchgear
- CPT Open Circuits
- Followed PIRT recommendations
- MHIF Analysis
- Followed NEI 00-01, Appendix B method Circuit Analysis Slide 13 of 14
Q ti
?
Questions ?
Circuit Analysis Slide 14 of 14