ML14188A970
| ML14188A970 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 07/08/2014 |
| From: | Schrader K Pacific Gas & Electric Co |
| To: | Division of Policy and Rulemaking |
| Holonich J, DPR/PLPB, 415-7297 | |
| References | |
| Download: ML14188A970 (15) | |
Text
DIABLO CANYON POWER PLANT PROCESS PROTECTION SYSTEM REPLACEMENT LICENSING EXPERIENCE USING ISG 6 NRC Meeting on Digital I&C July 8 2014 July 8, 2014 Ken Schrader, MS Senior Advisor, Engineering, PG&E Vice Chairman, PWROG kjse@pge.com 805-545-4328 11
Agenda ISG 6 ISG 6 Pilot Application PG&E ISG 6 Lesson Learned 2
ISG 6 ISG 6 - Licensing Process for Digital I&C ISG 6 Licensing Process for Digital I&C System Modifications Roadmap to success to develop acceptable Roadmap to success to develop acceptable License Amendment Request (LAR)
ISG 6 process will reduce licensing uncertainty and effort for future licensees/vendors Facilitate increased safety to nuclear safety t
systems 3
ISG 6 Pilot Application Diablo Canyon is pilot plant for use of ISG 6 Diablo Canyon is pilot plant for use of ISG 6 PG&E participated in ISG 6 working group PG&E submitted pilot application 10/26/11 PG&E submitted pilot application 10/26/11 (ML11307A331)
Process Protection System replacement Process Protection System replacement Invensys Tricon V10 (PLC b d)
(PLC based)
Westinghouse Advanced Logic System (ALS) (FPGA based) 4
- (ALS) (FPGA based)
ISG 6 Pilot Application Both vendors obtained NRC approval of Both vendors obtained NRC approval of platform topical reports (TR) during Pilot Application review pp Invensys Tricon V10, April, 2012 (ML1209008902)
Westinghouse ALS, September 9, 2013 g
p (ML13210A309)
Approved vendor TRs allow use of ISG 6 Tier 1 for systems with approved TR (fast-track)
Significantly simplifies future licensee LARs, NRC review and safety evaluation 5
review, and safety evaluation
ISG 6 Pilot Application Project Scope Project Scope 6
ISG 6 Pilot Application Process Protection System Replacement A
hit t
Architecture 7
ISG 6 Pilot Application Current Status Completed ACRS reviews in February and March Completing final ISG 6 milestones NRC t
f li ti h
b ll t
NRC support of application has been excellent Resources Use of sharepoint site for documentation Use of sharepoint site for documentation Efficient resolution of open items Identifying lessons learned from Oconee project ACRS presentations/meetings 8
ISG 6 Pilot Application Outstanding Milestones Invensys Tricon Factory Acceptance Test (FAT) in progress, first of four protection sets tested acceptable protection sets tested acceptable Expect to submit FAT results to NRC in October Westinghouse ALS Final detailed design in progress FAT expected spring 2015 S b it FAT lt 2015 Submit FAT results summer 2015 PG&E to respond to final set of RAIs 9
ISG-06 Lessons Learned Most significant NRC issue, testing and software Most significant NRC issue, testing and software requirements on proposed common maintenance workstation for both Tricon and ALS subsystems PG&E changed design to use separate maintenance computer for each subsystem in each division Simplifies factory acceptance testing requirements and Simplifies factory acceptance testing requirements and eliminates potential software interaction issues 10
ISG-06 Lessons Learned PG&E issued single Functional Requirements PG&E issued single Functional Requirements Specification for project (covered both platforms)
Resulted in unnecessary difficulty for vendor design, vendor d
t ti d NRC i
documentation, and NRC review Contributed to vendors not meeting all applicable requirements, requiring redesign Extended vendor schedules Complicated NRC review and resulted in vendor audit issues 11
ISG-06 Lessons Learned PG&E did not incorporate I&C maintenance personnel PG&E did not incorporate I&C maintenance personnel expectations to support troubleshooting and maintenance into initial Functional Requirements S
ifi ti Specifications Required revision to Functional Requirements Specification Specification Caused vendors to have to redesign to meet new functional requirements 12
ISG-06 Lessons Learned Vendors did not fully understand meaning of some Vendors did not fully understand meaning of some functional requirements Nuclear requirements and terminology are unique Some vendor design personnel did not have prior nuclear project experience (most PLC and FPGA business is non-nuclear)
Clarifying questions on requirements from vendors occurred late in detailed design, required some redesign Utilities need to proactively ensure vendor design and IV&V Utilities need to proactively ensure vendor design and IV&V personnel have correct understanding of all requirements 13
ISG-06 Lessons Learned Vendors underestimated effort for detailed design Vendors underestimated effort for detailed design First-of-Its-Kind large scope application of each vendor platform to US nuclear plant protection system N
l i
t d
l Nuclear requirements and processes are more complex Vendor document revisions required to address ISG 6 requirements 14
Closing Comments ISG 6 process will reduce licensing ISG 6 process will reduce licensing uncertainty and effort for future Digital I&C applications pp
- No precedents
- Initial applications TR i
/
d
- Routine applications M lti l TR p
- No current TRs
- High uncertainty
- High Cost
- TRs review/approved
- Medium uncertainty
- Medium Cost
- Multiple TRs approved/current
- Acceptable uncertainty
- Reduced cost
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