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Category:Response to Request for Additional Information (RAI)
MONTHYEARML19207A2572019-07-26026 July 2019 LLC Response to NRC Request for Additional Information No. 427 (Erai No. 9408) on the NuScale Design Certification Application ML19207A2742019-07-26026 July 2019 LLC Response to NRC Request for Additional Information No. 386 (Erai No. 9316) on the NuScale Design Certification Application ML18243A4682018-08-31031 August 2018 Korea Hydro & Nuclear Power Co., Ltd - WO 89 Response to Digital I&C Questions ML18243A4652018-08-31031 August 2018 Korea Hydro & Nuclear Power Co., Ltd - Submittal of LTR-RAM-17-81, Revision 4, Work Order 89: Response to Digital I&C Questions. ML18225A1382018-08-13013 August 2018 Korea Hydro & Nuclear Power Co, Ltd., Revised Response to RAI 520-8693 for Question 06.02.02-43, (Rev.1) ML18222A3502018-08-10010 August 2018 Korea Hydro & Nuclear Power Co., Ltd. - Response to RAI Er 1-8428 for Question EIS ACC/SA-15 (Rev.4) ML18221A5162018-08-0909 August 2018 Korea Hydro & Nuclear Power Co., Ltd. - Response to RAI 452-8545 for the Question 10.03.06-21 (Rev.1) ML18218A2092018-08-0606 August 2018 Korea Hydro & Nuclear Power Co., Ltd - Transmittal of Revised Response to RAI 271-8290 for Question 19-15 (Rev. 5) ML18218A2072018-08-0606 August 2018 Korea Hydro & Nuclear Power Co., Ltd - Revised Response to RAI 271-8290 for Question 19-15 (Rev. 5) ML18218A2032018-08-0606 August 2018 Korea Hydro & Nuclear Power Co, Ltd., Revised Response to RAI 312-8343 for Question 19-16 (Rev. 3) ML18218A1952018-08-0606 August 2018 Korea Hydro & Nuclear Power Co, Ltd., Revised Response to RAI 434-8352 for Question 19-92 (Rev.5) ML18205A7322018-07-24024 July 2018 Korea Hydro & Nuclear Power Co., Ltd - Transmittal of Revised Response to RAI 558-9456 for Question 14.03.01-1 (Rev.1) ML18205A7312018-07-24024 July 2018 Korea Hydro & Nuclear Power Co., Ltd - Revised Response to RAI 558-9456 for Question 14.03.01-1 (Rev.1) ML18205A6372018-07-24024 July 2018 Korea Hydro & Nuclear Power Co., Ltd - Revised Response to RAI 356-7881 for the Question 07-18 (Rev.3) ML18207A4562018-07-20020 July 2018 Korea Hydro - Revised Response to Request for Additional Information, APR1400 Design Certification, RAI No. 112-8015 ML18201A4002018-07-20020 July 2018 LLC Response to NRC Request for Additional Information No. 491 (Erai No. 9557) on the NuScale Design Certification Application ML18197A2972018-07-13013 July 2018 Korea Hydro & Nuclear Power Co., Ltd - Revised Response to RAI 88-8046 for Question 03.05.02-4 (Rev.1) ML18197A2962018-07-13013 July 2018 Korea Hydro & Nuclear Power Co., Ltd - Transmittal of Revised Response to RAI 88-8046 for Question 03.05.02-4 (Rev.1) ML18194A8572018-07-13013 July 2018 Korea Hydro & Nuclear Power Co., Ltd - Revised Response to RAI 432-8377 for Question 19-64 (Rev.7) ML18194A8552018-07-13013 July 2018 Korea Hydro & Nuclear Power Co., Ltd - Transmittal of Revised Response to RAI 432-8377 for Question 19-64 (Rev.7) ML18194A8232018-07-13013 July 2018 Korea Hydro & Nuclear Power Co., Ltd, Revised Response to RAI 316-8305 for the Question 17.04-1 (Rev. 4) ML18190A1622018-07-0909 July 2018 Korea Hydro & Nuclear Power Co, Ltd., Revised Response to RAI 420-8482 for Question 19.03-36 (Rev.2) ML18184A3682018-07-0303 July 2018 Korea Hydro & Nuclear Power Co., Ltd - Response to RAI 301-8280 for the Question 07.01-45 ML18178A5772018-06-27027 June 2018 Korea Hydro & Nuclear Power Co., Ltd - Transmittal of Revised Response to RAI Er 1-8428 for Question EIS ACC/SA-15 (Rev.3) ML18172A3142018-06-21021 June 2018 Korea Hydro & Nuclear Power Co., Ltd - Response to Action Item 5-6 Section 5.4.2.1 Mcb Issue List Regarding APR-1400, FSAR Section 5.4.2.1 ML18172A3132018-06-21021 June 2018 Korea Hydro & Nuclear Power Co., Ltd - Transmittal of Revised Response to Action Item 5-6.11 Regarding Mcb Issue for DCD Section 5.4 ML18170A0592018-06-19019 June 2018 Korea Hydro & Nuclear Power Co, Ltd - Revised Response to RAI 329-8424 for Question 14.03.08-13 (Rev.1) ML18162A3432018-06-11011 June 2018 Korea Hydro & Nuclear Power Co., Ltd - Transmittal of Revised Response to RAI 557-9199 for the Question 03.08.05-20 (Rev. 2) ML18155A4082018-06-0404 June 2018 Korea Hydro & Nuclear Power Co, Ltd. - Revised Response to RAI 61-7984 for Question 08.03.01-5 (Rev. 1) ML18155A4012018-06-0404 June 2018 Korea Hydro & Nuclear Power Co, Ltd. - Revised Response to RAI 297-8309 for Question 19.03-1 (Rev.2) ML18155A3932018-06-0404 June 2018 Korea Hydro & Nuclear Power Co., Ltd - Revised Response to RAI 297-8309 for Question 19.03-2 (Rev. 1) ML18155A3922018-06-0404 June 2018 Korea Hydro & Nuclear Power Co., Ltd - Transmittal of Revised Response to RAI 297-8309 for Question 19.03-2 (Rev. 1) ML18155A3822018-06-0404 June 2018 Korea Hydro & Nuclear Power Co., Ltd'S Revised Response to RAI 420-8482 for Question 19.03-36 (Rev. 1) ML18150A5832018-05-30030 May 2018 Korea Hydro & Nuclear Power Co., Ltd - Revised Response to RAI 557-9199 for the Question 03.08.05-20 ML18150A5802018-05-30030 May 2018 Korea Hydro & Nuclear Power Co., Ltd - Submittal of Revised Response to RAI 557-9199 for the Question 03.08.05-20 ML18145A0842018-05-25025 May 2018 Korea Hydro & Nuclear Power Co, Ltd. - Revised Response to RAI 301-8280 for the Question 07.01-45 (Rev.2) ML18142A2992018-05-18018 May 2018 Korea Hydro & Nuclear Power Co, Ltd. - Revised Response to RAI 255-8285 for the Question 03.08.05-7 (Rev. 5) ML18142A3062018-05-17017 May 2018 Korea Hydro & Nuclear Power Co., Ltd. - Response to RAI 554-9146 for Question 07.02-18 (Rev. 1) ML18137A4822018-05-17017 May 2018 Korea Hydro & Nuclear Power Co, Ltd. - Response to RAI 558-9456 for Question 14.03.01-1 ML18137A4742018-05-17017 May 2018 Korea Hydro & Nuclear Power Co., Ltd - Revised Response to RAI 128-7980 for the Question 18-18 (Rev. 1) ML18137A4722018-05-17017 May 2018 Korea Hydro & Nuclear Power Co., Ltd - Transmittal of Revised Response to RAI 128-7980 for the Question 18-18 (Rev. 1) ML18131A1042018-05-11011 May 2018 Korea Hydro & Nuclear Power Co, Ltd - Revised Response to RAI 7-8567 for Question APR1400-4 (Rev. 1) ML18131A1062018-05-11011 May 2018 Korea Hydro & Nuclear Power Co, Ltd - Revised Response to RAI 7-8567 for Question APR1400-4 (Rev. 1) ML18131A1132018-05-11011 May 2018 Revised Response to RAI 412-8525 for Question 08.04-15 (Rev. 1) ML18129A3882018-05-0909 May 2018 Korea Hydro & Nuclear Power Co., Ltd - Revised Response to Request for Additional Information for Question No. 08.01-21 ML18124A1132018-05-0404 May 2018 Korea Hydro & Nuclear Power Co, Ltd - Revised Response to RAI 45-7883 for the Question 07.09-2 (Rev.6) ML18124A1512018-05-0404 May 2018 Korea Hydro & Nuclear Power Co, Ltd - Revised Response to RAI 555-9163 for the Question 07.02-19 (Rev. 2) ML18121A4162018-05-0101 May 2018 Korea Hydro & Nuclear Power Co, Ltd - Revised Response to RAI 433-8363 for Question 19-83 (Rev.2) ML18120A3042018-04-30030 April 2018 Korea Hydro & Nuclear Power Co., Ltd - Response to RAI 342-8291 for Question 07.08-10 (Rev.2) ML18115A3332018-04-25025 April 2018 Korea Hydro & Nuclear Power Co, Ltd. - Revised Response to RAI 553-9084 for the Question 18-134 (Rev.2) 2019-07-26
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EIS ACC/SAMDA-4_Rev.2 - 1 / 3 KEPCO/KHNP REVISED RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION APR1400 Design Certification Korea Electric Power Corporation / Korea Hydro & Nuclear Power Co., LTD Docket No.52-046 RAI No.: ER 1-8429 SRP Section: Environmental Report Application Section: APR1400 Environmental Report Date of RAI Issue: 03/22/2016 Question No. EIS ACC/SAMDA-4 10 CFR 51.55(a) requires each applicant for a standard design certification under subpart B of 10 CFR Part 52 (i.e., 10 CFR 52.47(b)(2)) to submit with its application a separate document entitled, "Applicant's Environmental ReportStandard Design Certification." The environmental report must address the costs and benefits of severe accident mitigation design alternatives, and the bases for not incorporating severe accident mitigation design alternatives in the design to be certified.
The environmental standard review plan (ESRP) Section 7.3, Severe Accident Mitigation Alternatives, directs the staff to evaluate and independently confirm an applicants severe accident mitigation design alternatives (SAMDAs) analysis presented in an Environmental Report (ER) (i.e., the APR1400 ER, Applicants Environmental Report - Standard Design Certification, found under ML15006A038 and the technical report, Severe Accident Mitigation Design Alternatives (SAMDAs) for the APR1400, proprietary under ML15012A105 and nonproprietary under ML15009A246) that applies design and site information along with a cost benefit analysis based on the guidance provided in NUREG/BR-0184. The scope includes the identification and evaluation of design alternatives and procedural modifications that reduce the radiological risk from a severe accident by preventing substantial core damage (i.e., preventing a severe accident) or by limiting releases from containment in the event that substantial core damage occurs (i.e., mitigating the impacts of a severe accident). The purpose of the review is to ensure that plant design changes with the potential for improved severe accident safety performance are identified and evaluated.
The staff requires the following additional information in order to complete its review of the environmental impacts of severe accidents and to ensure appropriate documentation of the applicants assessment in the APR1400 Environmental Report.
Provide additional documentation in the ER or supporting technical reports to explain the purpose, need and development of Tables 5a through 5f and Tables 6a through 6f of APR1400-E-P-NR-14006-P. The discussion of these tables in Section 6 and 7 of APR1400-E-P-NR-
EIS ACC/SAMDA-4_Rev.2 - 2 / 3 KEPCO/KHNP 14006-P is very brief (see pages 17 and 19) and does not provide a rationale as to how the information was developed, why each important basic event is being presented in the tables, and if there is any relationship to the Subsections 7.1 through 7.22 of APR1400-E-P-NR-14006-P.
The NRC staff request that any revisions to the ER or supporting technical reports be provided as a markup as part of the response to this RAI.
The response to this RAI also may need to be reflected in the DCDs FSAR Chapter 19.
This RAI is related to the Environmental Audit Information Needs ER-TI-13 (ML15198A023).
Response - (Rev. 2)
The ASME PRA Standard (ASME/ANS RA-Sb-2013) defines a significant basic event as a basic event that contributes significantly to the computed risks for a specific hazard group.
This definition includes any basic event that has an FV importance greater than 0.005 or a RAW importance greater than 2. For the SAMDA analysis (APR1400-E-P-NR-14006-P, Rev. 1),
Tables 6a through 6f include basic events with FV importance greater than 0.005 (0.5%), as the purpose of the SAMDA analysis is to consider ways to reduce risk. The RAW importance parameter does not provide indication of potential risk reduction and is not germane to a SAMDA analysis for risk reduction. Therefore, the RAW importance measure is not used.
Tables 7a through 7f include basic events from the top 100 cutsets that do not have a FV importance greater than 0.005 (0.5%). These basic events were reviewed because they could be considered important based on the order they appear in the cutsets.
NEI-05-01, Severe Accident Mitigation Alternatives (SAMA) Analysis Guidance Document, allows the open interpretation for the definition of dominant cutsets, provided justification is give.
As is documented in the APR1400 DCD Table 19.1-19, the top 100 internal events cutsets contribute approximately 37 percent of the total CDF and the number of cutsets that contribute to 95 percent of the CDF is over 290,000. Review of additional basic events that do not have a FV importance greater than 0.005 (0.5%) and are outside the top 100 cutsets would have little influence on CDF and are therefore not likely contributors for identification of cost benefit enhancements.
Impact on DCD There is no impact on the DCD.
Impact on PRA There is no impact on the PRA.
Impact on Technical Specifications There is no impact on the Technical Specifications.
EIS ACC/SAMDA-4_Rev.2 - 3 / 3 KEPCO/KHNP Impact on Technical/Topical/Environmental Reports The Environmental Report and SAMDA Report are updated to reflect the changes discussed above.