ML17263B250
| ML17263B250 | |
| Person / Time | |
|---|---|
| Site: | 05200046 |
| Issue date: | 09/20/2017 |
| From: | NRC |
| To: | Korea Hydro & Nuclear Power Co, Ltd |
| References | |
| Download: ML17263B250 (3) | |
Text
KHNPDCDRAIsPEm Resource From: Ward, William Sent: Wednesday, September 20, 2017 8:15 PM To: apr1400rai@khnp.co.kr; KHNPDCDRAIsPEm Resource; daegeun.ahn@gmail.com; Andy Jiyong Oh; Jungho Kim (jhokim082@gmail.com); Wagner, David Cc: McCoppin, Michael; Ward, William; Eudy, Michael; Jung, Ian; Mott, Kenneth; Zhang, Deanna
Subject:
APR1400 Design Certification Application RAI 555-9163 [7.2 - Reactor Trip System]
Attachments: APR1400 DC RAI 555 ICE 9163.pdf
- KHNP, The attachment contains the subject request for additional information (RAI). This RAI was sent to you in draft form. Your licensing review schedule assumes technically correct and complete responses within 30 days of receipt of RAIs.
Please submit your RAI response to the NRC Document Control Desk.
Thank you, William R. Ward, P.E.
APR1400 DCA Lead Project Manager U.S. Nuclear Regulatory Commission m/s O8-G9 Washington, DC, 20555-0001 NRO/DNRL/Licensing Branch 2 ofc O8-H15 ofc (301) 415-7038 U.S. NRC Protecting People and the Environment Please consider the environment before printing this email.
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Hearing Identifier: KHNP_APR1400_DCD_RAI_Public Email Number: 614 Mail Envelope Properties (0c6c50e6ef474580a77f9ddb50876925)
Subject:
APR1400 Design Certification Application RAI 555-9163 [7.2 - Reactor Trip System]
Sent Date: 9/20/2017 8:15:17 PM Received Date: 9/20/2017 8:15:18 PM From: Ward, William Created By: William.Ward@nrc.gov Recipients:
"McCoppin, Michael" <Michael.McCoppin@nrc.gov>
Tracking Status: None "Ward, William" <William.Ward@nrc.gov>
Tracking Status: None "Eudy, Michael" <Michael.Eudy@nrc.gov>
Tracking Status: None "Jung, Ian" <Ian.Jung@nrc.gov>
Tracking Status: None "Mott, Kenneth" <Kenneth.Mott@nrc.gov>
Tracking Status: None "Zhang, Deanna" <Deanna.Zhang@nrc.gov>
Tracking Status: None "apr1400rai@khnp.co.kr" <apr1400rai@khnp.co.kr>
Tracking Status: None "KHNPDCDRAIsPEm Resource" <KHNPDCDRAIsPEm.Resource@nrc.gov>
Tracking Status: None "daegeun.ahn@gmail.com" <daegeun.ahn@gmail.com>
Tracking Status: None "Andy Jiyong Oh" <jiyong.oh5@gmail.com>
Tracking Status: None "Jungho Kim (jhokim082@gmail.com)" <jhokim082@gmail.com>
Tracking Status: None "Wagner, David" <david.wagner@aecom.com>
Tracking Status: None Post Office: HQPWMSMRS01.nrc.gov Files Size Date & Time MESSAGE 679 9/20/2017 8:15:18 PM APR1400 DC RAI 555 ICE 9163.pdf 71166 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
Recipients Received:
REQUEST FOR ADDITIONAL INFORMATION 555-9163 Issue Date: 09/20/2017 Application
Title:
APR1400 Design Certification Review 046 Operating Company: Korea Hydro & Nuclear Power Co. Ltd.
Docket No.52-046 Review Section: 07.02 - Reactor Trip System Application Section: 7.2 [NSAL-17-2]
QUESTION 07.02-19 Title 10 of the Code of Federal Regulations (10 CFR), Section 52.47(a)(2), Contents of applications; technical information, requires in part, that the description of the structures, systems, and components (SSCs) of the facility shall be sufficient to permit understanding of the system designs and their relationship to the safety evaluations. 10 CFR Part 50 Appendix A, General Design Criterion (GDC) 23 states, in part, that the protection system shall be designed to fail into a safe state or into a state demonstrated to be acceptable on some other predefined basis. Due to new Common Q Platform design information presented in the Westinghouse Nuclear Safety Advisory Letter (NSAL)-17-2, dated July 5, 2017 (Agency Documents Access and Management System (ADAMS) Accession No. ML17213A208), the staff requests Korea Hydro & Nuclear Power Co., Ltd. (KHNP) to review the applicable safety-related Common Q platform based systems design descriptions of the APR1400 design certification application (DCA) and demonstrate that the APR1400 DCA is not affected by the design information contained within the NSAL. Specifically, the staff requests KHNP to:
- 1) Review information presented in NSAL-17-2 against information presented in the APR1400 Final Safety Analysis Report (FSAR) and referenced technical reports design descriptions to determine if the information present in NSAL-17-2 affects the APR1400 DCA;
- 2) Review and clarify whether the specified watchdog timers (WDTs) referenced in the APR1400 FSAR, Tier 2 and the APR1400-Z-J-NR-14001-P, Safety Instrumentation and Controls (I&C) System, Technical Report, Revision 1 are the window WDTs referenced in WCAP-16097, Common Qualified Platform Topical Report, Revision 3, and make appropriate modifications in the APR1400 FSAR Tier 2 and its referenced technical reports to reflect this clarification;
- 3) Verify that the window WDTs are hardware-based (i.e., does not contain software and do not rely upon software for activation), as specified in the APR1400 DCA and WCAP-16097, and include the definition for the term hardware provided in the response to RAI 356-7881, Question 07-14 into the APR1400 FSAR, Tier 2 or the Safety I&C System Technical Report; and
- 4) Expand the design descriptions in APR1400 FSAR Tier 1, Sections 2.5.1.1, Item 13 and 2.5.4.1, Item 10 and corresponding Inspections, Tests, Analyses and Acceptance Criteria in Tier 1, Tables 2.5.1-5, Item 13 and 2.5.4-5, Item 10, respectively, to verify that the WDTs used to generate trip and fail-safe conditions for reactor trip and engineered safety features actuation system functions, respectively, are hardware-based.
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