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Category:INTERNAL OR EXTERNAL MEMORANDUM
MONTHYEARNUREG-1512, Provides Advisory Committee on Reactor Safeguards with Attached Suppl to AP600 FSER for Consideration.Suppl FSER Documents Staff Review of Changes to AP600 Design Documentation Since Issuance of FSER NUREG-15121999-10-0707 October 1999 Provides Advisory Committee on Reactor Safeguards with Attached Suppl to AP600 FSER for Consideration.Suppl FSER Documents Staff Review of Changes to AP600 Design Documentation Since Issuance of FSER NUREG-1512 ML20206N1481999-05-12012 May 1999 Submits Response to Re Lessons Learned from Review of Westinghouse Application for Certification of AP600 Std Plant Design ML20206S7441999-04-16016 April 1999 Informs That During 460th Meeting on 990310-13,ACRS Discussed Several Matters & Completed Listed Repts & Ltrs. Committee Also Authorized Larkins,To Transmit Noted Memo ML20205R7321999-04-15015 April 1999 Informs That During 990407-10 ACRS 461st Meeting,Committee Considered Proposed Rule on AP600 Design Certification & Decided to Review It Following Reconciliation of Public Comments ML20196K6061999-03-22022 March 1999 Informs That During 990310-13 ACRS 460th Meeting, Deliberations Re Lessons Learned from Review of AP600 Passive Plant Design Were Completed.With List of Recommendations ML20137S3291999-02-23023 February 1999 Requests That Encl Fax Be Distributed to Docket File 52-003,PDR & to Project Manager for AP600 Review ML20153G5281998-09-28028 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5759 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9412020134 IR 05000713/20010721998-09-25025 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5759 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9507130172 IR 05000718/20020221998-09-25025 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5768 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9507180222 IR 05000526/20040591998-09-25025 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5761 Stated That Encl Rept Is No Longer Considered Proprietary.Encl Originally Submitted as Part of File Package 9505260459 ML20153G6271998-09-23023 September 1998 Forwards Nonproprietary Version of AP600 Re ACRS Meeting Presentation Matl.Encl Originally Submitted as Part of File Package 9806040239 ML20153F3341998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5757 ,stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9310250230 ML20153F4341998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5757 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9310120408 ML20153F5001998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5753 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9303030269 ML20153F5671998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5751 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9202240203 ML20153F6351998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5753 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9212230068 ML20153F7461998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5759 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9806160016 ML20153F7901998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5756 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9610090122 ML20153F8391998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5757 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9401270187 ML20153F8901998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC 98-5756 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9410250108 IR 05000425/20010871998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5757 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9504250187 ML20153G3391998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5756 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9801140081 ML20153G4221998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5757 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9402020328 ML20153G4761998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5759 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9807170183 ML20153G3771998-09-21021 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5753 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9304260045 ML20153G4041998-09-21021 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5753 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9307200229 ML20153G6971998-09-21021 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5756 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of 9702200289 ML20153G9961998-09-16016 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5751 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9203170090 ML20153G3561998-09-15015 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5753 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9212150325 IR 07100119/20020401998-09-14014 September 1998 Redirects Info Encl & Previously Considered as Proprietary Per .W Ltr NSD-NRC-5756 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9711190240 ML20151W2521998-09-11011 September 1998 Discusses Redirection of Previously Proprietary Matl Into Public.Encls 1 & 2 Originally Submitted with Westinghouse Ltr NSD-NRC-96-4848 (ANO 9610240050.) Proprietary Markings Removed ML20151W2221998-09-0909 September 1998 Discusses Redirection of Matl Previously Considered Proprietary to Pdr.Revs 0 & 1 Removed & Matl No Longer Considered Proprietary Encl.Encls Originally Submitted as Part of File Packages 9207160108 & 9401250172 ML20239A1661998-09-0303 September 1998 Informs That Commissioner Nj Diaz Approves Publication of FSER & Issuance of Final Design Approval for Westinghouse AP600 Design ML20239A1281998-09-0303 September 1998 Informs That Commission Has Approved Staff Intention to Publish FSER & Issue Fda for AP600 Design ML20239A1461998-09-0202 September 1998 Informs of Support to Staff Proposal to Issue AP600 Final Safety Evaluation Rept & Final Design Approval.Commends Staff for Efforts in Completing Sound Technical Review ML20151U4451998-09-0202 September 1998 Informs That Westinghouse (DCP/NRC1414) States That WCAP-13957 Is No Longer Considered Proprietary by Westinghouse.Attachments Originally Submitted as Part of File Package 9402160116 ML20151S5951998-09-0101 September 1998 Informs That Chairman SA Jackson Approves Publishing FSER & Issuing Fda for AP600 Design on or Before 980904 ML20238F8801998-08-28028 August 1998 Notifies Commission of Staff Intent to Publish FSER for Westinghouse Electric Co AP600 Standard Plant Design,As Discussed in Memo ML20238F5381998-08-27027 August 1998 Ack Receipt of Re Safety Aspects of Westinghouse Electric Co Application for Certification of AP600 Passive Plant Design.Rept Will Be Reproduced in App G of FSER for AP600 ML20206S6521998-08-18018 August 1998 Informs That During 980708-10 ACRS 454th Meeting,Several Matters Were Discussed & Listed Repts & Letters Completed. Executive Director Also Authorized to Transmit Noted Memos ML20236W9501998-08-0303 August 1998 Ack Receipt of on Views of ACRS Re Safety Aspects of W Application for Certification of AP600 Design.Responds to Concerns Re Test & Analysis Program & Environ Qualification Testing for Passive Autocatalytic Recombiners ML20236T7431998-07-23023 July 1998 Informs That During 454th Meeting of ACRS on 980708-10,NRC Completed Safety Review of W Application for Certification of AP600 Passive Plant Design NUREG-1635, Informs That During 453rd Meeting on 980603-05,ACRS Discussed Several Matters & Completed Listed Repts & Ltr1998-07-0707 July 1998 Informs That During 453rd Meeting on 980603-05,ACRS Discussed Several Matters & Completed Listed Repts & Ltr ML20249A8131998-06-15015 June 1998 Discusses 453rd Meeting of ACRS Held on 980603-05 Re Safety Aspects of W Application for Certification of AP600 Plant Design ML20248M0221998-06-11011 June 1998 Notification of AP600 ITAAC Appeal Meeting on 980611 in Rockville,Md to Resolve Use of Bldg Figures in Insps,Test, Analyses & Acceptance Criteria for AP600 Design ML20249A7241998-06-10010 June 1998 Submits AP600 ITAAC Appeal ML20216C1041998-05-14014 May 1998 Notification of 980521 Meeting W/Westinghouse in Rockville, MD to Discuss Remaining Open Issues on Inspections,Tests, Analyses & Acceptance Criteria for AP600 Design ML20216E8301998-04-14014 April 1998 Notification of 980416 Meeting W/Westinghouse in Rockville, MD to Discuss Comments from NRC Ltr & Reach Final Resolution on AP600 TS Issues ML20216C3001998-04-0909 April 1998 Informs That During 451st Meeting of ACRS on 980402,NRC Reviewed Various Chapters of AP600 Ssar & Associated Chapters of Draft Final SER ML20217H5651998-03-30030 March 1998 Notification of 980406 Meeting W/Listed Attendees in Rockville,Md for Westinghouse to Present Overview of Rev 4 & Discuss Bldg Insps,Tests,Analyses & Acceptance Criteria for AP600 Design 1999-05-12
[Table view] Category:MEMORANDUMS-CORRESPONDENCE
MONTHYEARNUREG-1512, Provides Advisory Committee on Reactor Safeguards with Attached Suppl to AP600 FSER for Consideration.Suppl FSER Documents Staff Review of Changes to AP600 Design Documentation Since Issuance of FSER NUREG-15121999-10-0707 October 1999 Provides Advisory Committee on Reactor Safeguards with Attached Suppl to AP600 FSER for Consideration.Suppl FSER Documents Staff Review of Changes to AP600 Design Documentation Since Issuance of FSER NUREG-1512 ML20206N1481999-05-12012 May 1999 Submits Response to Re Lessons Learned from Review of Westinghouse Application for Certification of AP600 Std Plant Design ML20206G9891999-05-0606 May 1999 Revised Staff Requirements Memo Re SECY-99-101, Proposed Rule - AP600 Design Certification ML20206F9061999-05-0404 May 1999 Staff Requirements Memo of SECY-99-101 Re Pr - AP600 Design Certification.Commission Approved Staff Recommendation to Publish Amend to 10CFR52 to Certify AP600 Std Plant Design in Fr ML20206S7441999-04-16016 April 1999 Informs That During 460th Meeting on 990310-13,ACRS Discussed Several Matters & Completed Listed Repts & Ltrs. Committee Also Authorized Larkins,To Transmit Noted Memo ML20205R7321999-04-15015 April 1999 Informs That During 990407-10 ACRS 461st Meeting,Committee Considered Proposed Rule on AP600 Design Certification & Decided to Review It Following Reconciliation of Public Comments ML20196K6061999-03-22022 March 1999 Informs That During 990310-13 ACRS 460th Meeting, Deliberations Re Lessons Learned from Review of AP600 Passive Plant Design Were Completed.With List of Recommendations ML20137S3291999-02-23023 February 1999 Requests That Encl Fax Be Distributed to Docket File 52-003,PDR & to Project Manager for AP600 Review ML20196H4031998-12-0404 December 1998 Srm,Advising That Commission Has Not Objected to Staff Plans to Proceed with AP600 rulemaking,SECY-98-267 ML20153G5281998-09-28028 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5759 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9412020134 IR 05000713/20010721998-09-25025 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5759 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9507130172 IR 05000718/20020221998-09-25025 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5768 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9507180222 IR 05000526/20040591998-09-25025 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5761 Stated That Encl Rept Is No Longer Considered Proprietary.Encl Originally Submitted as Part of File Package 9505260459 ML20153G6271998-09-23023 September 1998 Forwards Nonproprietary Version of AP600 Re ACRS Meeting Presentation Matl.Encl Originally Submitted as Part of File Package 9806040239 ML20153F3341998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5757 ,stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9310250230 ML20153F4341998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5757 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9310120408 ML20153F5001998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5753 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9303030269 ML20153F5671998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5751 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9202240203 ML20153F6351998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5753 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9212230068 ML20153F7461998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5759 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9806160016 ML20153F7901998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5756 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9610090122 ML20153F8391998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5757 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9401270187 ML20153F8901998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC 98-5756 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9410250108 IR 05000425/20010871998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5757 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9504250187 ML20153G3391998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5756 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9801140081 ML20153G4221998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5757 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9402020328 ML20153G4761998-09-22022 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5759 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9807170183 ML20153G3771998-09-21021 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5753 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9304260045 ML20153G4041998-09-21021 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5753 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9307200229 ML20153G6971998-09-21021 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5756 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of 9702200289 ML20153G9961998-09-16016 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5751 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9203170090 ML20153G3561998-09-15015 September 1998 Redirects Info Encl & Previously Considered as Proprietary, Per .W Ltr NSD-NRC-98-5753 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9212150325 IR 07100119/20020401998-09-14014 September 1998 Redirects Info Encl & Previously Considered as Proprietary Per .W Ltr NSD-NRC-5756 Stated That Encl Rept Is No Longer Considered Proprietary.Encls Originally Submitted as Part of File Package 9711190240 ML20151W2521998-09-11011 September 1998 Discusses Redirection of Previously Proprietary Matl Into Public.Encls 1 & 2 Originally Submitted with Westinghouse Ltr NSD-NRC-96-4848 (ANO 9610240050.) Proprietary Markings Removed ML20151W2221998-09-0909 September 1998 Discusses Redirection of Matl Previously Considered Proprietary to Pdr.Revs 0 & 1 Removed & Matl No Longer Considered Proprietary Encl.Encls Originally Submitted as Part of File Packages 9207160108 & 9401250172 ML20239A1281998-09-0303 September 1998 Informs That Commission Has Approved Staff Intention to Publish FSER & Issue Fda for AP600 Design ML20239A1661998-09-0303 September 1998 Informs That Commissioner Nj Diaz Approves Publication of FSER & Issuance of Final Design Approval for Westinghouse AP600 Design ML20239A1461998-09-0202 September 1998 Informs of Support to Staff Proposal to Issue AP600 Final Safety Evaluation Rept & Final Design Approval.Commends Staff for Efforts in Completing Sound Technical Review ML20151U4451998-09-0202 September 1998 Informs That Westinghouse (DCP/NRC1414) States That WCAP-13957 Is No Longer Considered Proprietary by Westinghouse.Attachments Originally Submitted as Part of File Package 9402160116 ML20151S5951998-09-0101 September 1998 Informs That Chairman SA Jackson Approves Publishing FSER & Issuing Fda for AP600 Design on or Before 980904 ML20238F8801998-08-28028 August 1998 Notifies Commission of Staff Intent to Publish FSER for Westinghouse Electric Co AP600 Standard Plant Design,As Discussed in Memo ML20238F5381998-08-27027 August 1998 Ack Receipt of Re Safety Aspects of Westinghouse Electric Co Application for Certification of AP600 Passive Plant Design.Rept Will Be Reproduced in App G of FSER for AP600 ML20206S6521998-08-18018 August 1998 Informs That During 980708-10 ACRS 454th Meeting,Several Matters Were Discussed & Listed Repts & Letters Completed. Executive Director Also Authorized to Transmit Noted Memos ML20236W9501998-08-0303 August 1998 Ack Receipt of on Views of ACRS Re Safety Aspects of W Application for Certification of AP600 Design.Responds to Concerns Re Test & Analysis Program & Environ Qualification Testing for Passive Autocatalytic Recombiners ML20236T7431998-07-23023 July 1998 Informs That During 454th Meeting of ACRS on 980708-10,NRC Completed Safety Review of W Application for Certification of AP600 Passive Plant Design NUREG-1635, Informs That During 453rd Meeting on 980603-05,ACRS Discussed Several Matters & Completed Listed Repts & Ltr1998-07-0707 July 1998 Informs That During 453rd Meeting on 980603-05,ACRS Discussed Several Matters & Completed Listed Repts & Ltr ML20249A8131998-06-15015 June 1998 Discusses 453rd Meeting of ACRS Held on 980603-05 Re Safety Aspects of W Application for Certification of AP600 Plant Design ML20248M0221998-06-11011 June 1998 Notification of AP600 ITAAC Appeal Meeting on 980611 in Rockville,Md to Resolve Use of Bldg Figures in Insps,Test, Analyses & Acceptance Criteria for AP600 Design ML20249A7241998-06-10010 June 1998 Submits AP600 ITAAC Appeal ML20216C1041998-05-14014 May 1998 Notification of 980521 Meeting W/Westinghouse in Rockville, MD to Discuss Remaining Open Issues on Inspections,Tests, Analyses & Acceptance Criteria for AP600 Design 1999-05-06
[Table view] |
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emy
, , jo UNITED STATES ACRSR-1685 i
! l March 19, 1997 )
. l Mr. L. Joseph Callan Executive Director for Operations U. S. Nuclear Regulatory Commission g.003 Washington, D. C. 20555-0001
Dear Mr. Callan:
SUBJECT:
NRC OFFICE OF NUCLEAR REGULATORY RESEARCH PROGRAM TO DEMONSTRATE THE ADEQUACY OF THE RELAPS/ MOD 3 CODE TO ANALYZE AP600 PASSIVE PLANT BEHAVIOR During the 439th meeting of the Advisory Committee on Reactor Safeguards, March 6-8, 1997, we completed our review of the NRC l Of. ce of Nuclear Regulatory Research (RES) program to demonstrate i the 2dequacy of the RELAP5/ MOD 3 code for analyzing the behavior of the Westinghouse AP600 passive plant design. Our Subcommittee on Thermal-Hydraulic Phenomena met to consider this matter on February i 22-23, 1996 and February 12-14, 1997. We previously commented on our initial review of this issue in a March 19, 1996 letter to the Executive Director for Operations. During this review, we had the i benefit of discussions with representatives of the NRC staff, and we also had the benefit of the documents referenced. l 1 Scalina The staff sponsored two scaling analyses to show that data obtained from several integral and separate effects test facilities are applicable to AP600 and can be used to validate RELAP5/ MOD 3.2.1.2 for assessing the ability of the AP600 design to address design basis accidents (DBAs). Both sets of analyses demonstrated that the data available are appropriate for validating the code. We agree with the conclusions of these analyses and compliment the staff and its contractors on a job well done. A final summary report consolidating the results of these two analyses should be written to document the conclusion that the data are sufficiently complete and also to note how the tests were used for code validation.
Code Adecuaev The code documentation made available to us was out of date. As a result, our conclusions about code adequacy are based partly on the additional information presented at the meetings. Based on our review of this information, we believe that RELAP5/ MOD 3.2.1.2 is f lj 0 9704010234 970319 PDR R-1695 ACRS PDR fh' 010014 Ipppuppppppa
S
, 2 adequate for evaluating Westinghouse AP600 DBAs. The RELAP5/ MOD 3.2.1.2 calculations for particular DBAs showed that sufficient margin exists in the AP600 design. The tests and the associated code predictions indicate that the core does not uncover under any of the tested DBA conditions. Documentation reflecting i hat was presented to us should be completed in a timely manner.
We also believe that there is a need to develop more quantitative criteria than those used by RES for assessing the adequacy of a thermal-hydraulic code. .
During our review, a number of deficiencies in the RELAP5/ MOD 3.2.1.2 code were identified but were determined not to l significantly affect the code's capability to evaluate the AP600 i emergency core cooling system behavior. Nevertheless, these l deficiencies indicate that the code falls short of being a true i best-estimate code. (These deficiencies are also generally found I in the TRAC code.) The deficiencies identified include the following:
1
- 1. The critical flow model is a " work-around" that is appropriate j only for this specific application. l l
- 2. The treatment of subcooled nucleate boiling in the core is poor.
- 3. The code does not model horizontal stratified flow very well.
- 4. The drift-flux correlations used in the code have known deficiencies at low pressure.
- 5. The code inadequately treats condensation and thermal stratification.
- 6. Treatment of the automatic depressurization system valves in both the code and in the experimental studies is overly simplistic. i There is a need to develop sound models in these areas for the i I
future consolidated systems code, and we recommend that a modest effort be continued to also improve these areas in the RELAPS code.
Inevitably, there will be uses of RELAPS/ MOD 3 other than demonstrating adequacy of the AP600 design. These uses could, for example, include studies ranging from loss of coolant accidents and transients to simulator fidelity evaluation. For some of these, it is sufficient to have a consarvative analysis, whereas for others ,
the results will need to be as realistic as possible. For any such additional uses of the code, the effects of the identified deficiencies need to be evaluated.
- , I i !
- i
l Modeling a nuclear power plant is a complex task that requires a '
mix of first principles combined with a great deal of physical l 4 insight and engineering judgment. As a result, personnel who are {
knowledgeable-about the thermal-hydraulic behavior of single and J
- two-phase flow as well as the use of computers must be available if '
l sound judgments are to be made.
The thermal-hydraulics team assembled by the NRC for this exercise demonstrated a great deal of understanding relative to both the AP600 test results and the accident behavior of the nominal plant j design. We believe that this work is excellent preparation for the s
" current effort of the NRC staff to develop a new " consolidated" thermal-hydraulics code and augurs well for its success.
l Dr. George Apostolakis did not participate in the Committee's
! deliberations regarding this matter.
i Sincerely, R. L. Seale 5-Chairman i
j
References:
' 1. U. S. Nuclear Regulatory Commission Report, NUREG/CR-5535, i "RELAP5/ MOD 3 Code Manual," Volumes 1-7, August 1995.
- 2. Letter dated March 19, 1996, from T. S. Kress, Chairman, ACRS, j to J. M. Taylor, Executive Director for Operations, NRC,
Subject:
NRC Staff Program on the Adequacy Assessment of the i RELAP5/ MOD 3 Code for Simulation of AP600 Passive Plant i Behavior.
! 3. Memorandum dated December 27, 1996, from M. W. Hodges, Office I l of Nuclear Regulatory Research, NRC, *> J. T. Larkins, !
! Executive Director, ACRS,
Subject:
Adequt.cy Assessment of the
! RELAPS MOD 3 Code to Analyze AP600 Passive Plant Behavior i Following Postulated Small Break Loss-Of-Coolant Accidents, l l transmitting the following reports: l l a. Idaho National Engineering Laboratory, Final Draft j
- Report, INEL-96/0400, " Adequacy Evaluation of ;
j RELAPS/ MOD 3, Version 3.2.1.2 for Simulating AP600 Small l 4 Break Loss-of-Coolant Accidents," December 1996, with l
} Appendix (Proprietary Information). l
} b. Idaho National Engineering Laboratory Report, INEL-
- 96/0395, " Evaluation and Assessment of RELAP5/ MOD 3 1 Version 3.2.1.2 for Simulating the Long-Term Phase of
- Small Break Loss-of-Coolant Accidents in the AP600," ,
i October 1996 (Proprietary Information). i
. . I 4
- c. Idaho National Engineering Laboratory, Final Draft Report, INEL-96/0440, " Applicability of Selected RELAPS/ MOD 3 Models and Correlations to AP600 Small Break Loss-of-Coolant Accidents," November 1996 (Proprietary Information).
- d. Idaho National Engineering Laboratory, Final Draft Report, INEL-96/0117, " Top-Down Scaling Analyses of AP600 Integral Test Data in Support of RELAPS Adequacy Assessment," December 1996 (Proprietary Information).
- e. Idaho National Engineering Laboratory Report, INEL-
. 94/0061, " Phenomena Identification and Ranking Tables for Westinghouse AP600 Small Break Loss-of-Coolant Accident, Main Steam Line Break, and Steam Generator Tube Rupture Scenarios," Revision 2, November 1996.
- f. U. S. Nuclear Regulatory Commission, Draft Report, "Phenomenology Observed in the AP600 Integral Systems Test Programs Conducted in the ROSA-AP600, APEX, and SPES-2 Facilities," D. Bessette, Office of Nuclear Regulatory Research, NRC; M. DiMarzo, University of Maryland; P. Griffith, Massachusetts Institute of Technology, December 1996 (Proprietary Information).
- g. U. S. Nuclear Regulatory Commission, Draft Report,
" Screening Reactor Steam / Water Piping Systems for Water Hammer," P. Griffith, Consultant, November 1996.
- 4. Idaho National Engineering Laboratory, Draft Report, INEL-96/0040, " Top-Down Scaling Analysis Methodology for AP600 Integral Tests," S. Banerjee, et al., January 1997 (Proprietary Information).
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