ML101670520
| ML101670520 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/17/2010 |
| From: | SCANA Corp, South Carolina Electric & Gas Co |
| To: | NRC/NRR/DIRS/IRIB |
| Jeremy Bowen, 415-3471 | |
| Shared Package | |
| ML101670555 | List: |
| References | |
| Download: ML101670520 (21) | |
Text
Enclosure 6 V.C. Summer Nuclear Station Presentation Meeting Summary of the 6/8/2010 Meeting with NRC/SNC/FPL/SCE&G Dated June 17, 2010
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Screening Criteria Identified for VCSNS
- SISBO mitigation strategy
- A relatively large number of manual operator actions used to mitigate cable separation
. Issues
- Operator manual actions that are complex
____________________ v.c. SUMMER NUCLEAR STATION
SISBO Mitigation Strategy
- VSCNS utilizes a SISBO Appendix R fire mitigation strategy
- SISBO ensures one train of equipment free from fire damage
- But it reduces:
- mitigation equipment availability
- requires local manual operator actions
____________________ v.c. SUMMER NUCLEAR STATION
Number of IPEEE Operator Actions
- 66 detailed modeling HEPs
- Both Inside and Outside of the Control Room
- Most zones use -20 HEP's to get to stable conditions
- 8 Risk significant HEP's (RAW> 2)
____________________ v.c. SUMMER NUCLEAR STATION
Complexity of IPEEE Operator Actions
- OMAs typically consist of only a few steps
- Many of the steps are used in normal operation and for routine equipment LOTO for maintenance
- Critical actions have been determined to be Feasible and Reliable through Engineering analysis and Operator walkdowns
____________________ v.c. SUMMER NUCLEAR STATION
Mitigation of Operator Action Complexity
- Job Performance Measures (JPMs) provide assurance that the actions would be successfully completed
- Any special equipment is pre-staged
- Added battery lighting
- Component marking was improved.
- Procedures are continuous use and require place-keeping
____________________ v.c. SUMMER NUCLEAR STATION
IPEEE Insights
- The Fire Emergency Procedures (FEPs) are sound and workable.
- Several improvements were identified and incorporated
- Today the FEPs are routinely trained on and improvements are identified and incorporated
____________________ v.c. SUMMER NUCLEAR STATION
IPEEE Insights Used to Reduce Fire Risk
- Train operators on IPEEE risk insights
- Train Fire Brigade Members on IPEEE risk insights
____________________ v.c. SUMMER NUCLEAR STATION
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Screening Criteria Applicable to V.C. Summer
- One screening criterion applies:
- SISBO mitigation strategy
- Two screening criteria do not apply:
- A relatively large number of manual operator actions
- Operator manual actions that are complex
____________________ lI.c. SUMMER NUCLEAR STATION
Summary of Current Program
- VCSNS is aware of the risk level associated with the SISBO fire mitigation strategy
- quantified during the IPEEE
- actions taken to minimize that risk
- The station is transitioning to NFPA-805 to further minimize the risk
____________________ v.c. SUMMER NUCLEAR STATION
Transitioning to NFPA 805
- NFPA805 Project Goals:
- Full compliance with NFPA805
- Eliminate SISBO
- Address Multiple Spurious Operations
- Reduce or eliminate Operator Manual Actions
- Clear and concise Configuration Management Documents
____________________ v.c. SUMMER NUCLEAR STATION
NFPA 805 Project Status
- Revised Shutdown Strategy
- Nuclear Safety Compliance Assessment
- Fire PRA (Peer Review Aug 2010)
- Fire Protection Program Features/Admin Controls
- Current Benefits (Insights)
____________________ v.c. SUMMER NUCLEAR STATION
NFPA 805 Project Status
- Preliminary Results
- Fire Outside Main Control Room: No OMA (Recovery Actions)
- LAR Submittal: Early Finish, 4th Qtr 2010
____________________ v.c. SUMMER NUCLEAR STATION
NFPA805 Compensatory Actions
- Compensatory Measures initiated
- NFPA805 Modifications
- Fire Modeling Solutions
- Engineering Analysis
- Assess insights against Current Licensing Basis (CLB)
- Determine appropriate Compensatory Measures
____________________ v.c. SUMMER NUCLEAR STATION
NFPA805 Compensatory Actions
- PRA Analysis
- Review NFPA805 insights outside CLB
- Conduct risk assessment
____________________ v.c. SUMMER NUCLEAR STATION
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