Application of Design Acceptance Criteria in the APR1400 DCA 28 Regulatory Information

Application of Design Acceptance Criteria in
the APR1400 DCA
March 8, 2016
Korea Hydro & Nuclear Power Co., Ltd
Steve Mannon
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APR1400-E-X-EC-15001-NP
Brief Overview of APR1400 Design
 APR1400 is an evolutionary design
− Two-loop PWR developed according to the evolutionary approach
that relies on the proven design concepts and components of the
OPR1000
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− Key design features include: Power Operated Safety Relief Valve
design, Direct Vessel Injection, Fluidic Device in the Safety Injection
Tanks, In-containment RWST, four EDGs for two electrical divisions,
Quadrant Separation of Safety Related SSCs, etc.
− Applied for NRC design certification in US (December 2014)
− Docketed for NRC review (March 2015)
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Brief Overview of APR1400 Design
 APR1400 is an essentially complete design
− Construction completed in Korea (Shin Kori Nuclear Units 3 & 4)
• OL for Unit 3 issued on October 2015
• Criticality reached on December 2015
− Under construction in UAE (Barakah Units 1 - 4)
Barakah, UAE
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• OL for Unit 1 scheduled for October 2016
SKN 3 & 4, Korea
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Use of DAC in the APR1400 DCA (1/2)
 APR1400 DCA (DC Application) makes use of DAC (referred to as
Design ITAAC) in one specific area:
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− Human Factors Engineering (HFE) Verification and Validation (V&V)
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Use of DAC in the APR1400 DCA (2/2)
 HFE V&V Design ITAAC
Inspections, Tests,
Analyses
Acceptance Criteria
1. The control room design
incorporates HFE
principles that minimize
the potential for operator
error.
1. An Integrated System
Validation Test will be
performed in accordance
with the Verification and
Validation Implementation
Plan.
1. An Integrated System
Validation Report exists
and concludes that
acceptance criteria
associated with each test
scenario are satisfied upon
initial performance of the
scenarios or upon
remediation of failures.
2. The as-built control room
HSIs are consistent with
the final validated design
specification
2. An inspection of the asbuilt control room HSIs
will be performed.
[Design ITAAC]
2. The as-built control room
HSIs conform to the
validated design with no
configuration deviations.
 Justifications for the use of Design ITAAC
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Design Commitment
− The final design can be validated by V&V process since V&V can
cover all of the other elements of HFE.
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APR1400 DCA Approach to DAC (1/3)
 APR1400 DCA describes an essentially complete design and a
design that has been constructed.
 I&C design makes use of proven technology previously reviewed
and approved by the NRC under Part 52.
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 Radiation shielding design makes use of detailed design
information available from plants under construction.
 Piping design makes use of a graded approach based on the safety
significance of piping to determine the level of design details.
− ASME Section III, Class 1 piping: Fatigue analysis and
environmental fatigue analysis are performed for RCS main loop,
Pressurizer Surge Line, RCS branch piping (Safety Injection and
Shutdown Cooling).
• Only one piping line analyzed for the symmetric branch systems.
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APR1400 DCA Approach to DAC (2/3)
 Piping design makes use of a graded approach based on the safety
significance of piping to determine the level of design details
(Cont’d)
− ASME Section III, Class 2 and 3 piping: Stress analysis for Main
Steam and Main Feedwater piping located inside Containment
Building and outside to the first 6-way restraint beyond the isolation
valves are performed.
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• Only one piping line analyzed for the symmetric systems.
− Piping Hazards Analysis: Main Steam and Main Feedwater piping
located inside Containment Building
• Only one piping line analyzed for the symmetric systems.
− Leak Before Break (LBB) Analysis: Pressurizer Surge Line
− Level of review necessary to address certain design details may be
better managed through application of a “graded” or “risk informed”
assessment.
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APR1400 DCA Approach to DAC (3/3)
 APR1400 DCA (DC Application) makes use of DAC (Design ITAAC)
in Human Factors Engineering Verification & Validation:
−
Expanded types and level of HFE information needed by DCA
−
DC to address all 12 elements of NUREG-0711 (plant specific elements
could be COL Items)
−
Results Summary Report (RSR) preferred
−
DAC justification for each element
− Alignment with standardization of ITAAC effort
− V&V Implementation Plan for the HFE design to be completed
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− Draft revision to SRP 18.0 provided additional guidance
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Conclusion
 Important to work with the Regulator.
 Minimization of DAC is enhanced by an “essentially complete
design” and use of “proven technology” in the DCA.
 Minimizing the use of DAC helps to enhance regulatory
review and minimizes the regulatory risk to a licensee.
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 Additional consideration should be given to the use of a
“graded approach” to address design details in certain
applications.
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