|
---|
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] |
Text
!
t eastg ACRSR-1807
. */ 4 UNITED STATE 3 PDR 8 i NUCLEAR REGULATORY COMMISSION
$ ,E ADVISORY COMMITTEE ON REACTOR SAFEGUARDS O,
WASHINGTON. D. C. 20555 I
%4 8
....4
$2r3 March 22,1999 Dr. William D. Travers Executive Director for Operations U.S. Nuclear Regulatory Cornmissio 1 Washington, D.C. 20555-0001 i
Dear Dr. Travers:
SUBJECT:
LESSONS LEARNED FROM THE ACRS REVIEW OF THE AP600 DESIGN During the 460th meeting of the Advisory Committee on Reactor Safeguards, March 10-13, 1999, we completed deliberations regarding lessons leamed from our review of the AP600 passive plant design. As noted in our July 23,1998 report, issues on the safety aspects of the l
AP600 application were resolved to our satisfaction. In the course of our review, however, we '
identified some lessons leamed that could affect reviews of future applications or that could be l relevant to operating plants.
Recommendations
- 1. Guidelines on the acceptable quality of documentation submitted by the applicant and on the lead times necessary for staff reviews should be c tablished and enforced. 1
- 2. Safety evaluation reports should include more of the technical rationale leading to the regulatory decision.
- 3. The NRC research program to improve and consolidate thermal-hydraulic codes should ha \
be continued.
- 4. Guidance for acceptable scaling methods, such as the Code Scaling, Applicability, and Uncertainty (CSAU) evaluation methodology, and for acceptable utilization of integral test data for the validation of computer codes should be developed.
i S. The development of technical and policy guidelines for approving requests for leducing the main control room staffing levels below present regulatory limits should be i l considered.
- 6. More experiments and analyses will be required before in-vessel core debris retention can be credited as part of the licensing basis. '
9904020201 990322 \ 17 PDR ACRS ;T R-1807 PDR )f '
2
- 7. 'Better standards for qualification of catalytic hydrogen recombiners should be required before approving these recombiners for use as safety-related equipment in nuclear power plants.
Q;ality and Timeliness of Material Submitted Our review was made particularly difficult because the associated documentation was submitted l piecemeal, was sometimes of poor quality, and contained technical errors. For future l applications, the staff should establish and enforce guidelines on the acceptable quality of documentation and on the lead times necessary for staff reviews.
l The section of the safety evaluation report (SER) related to the AP600 test and analysis
! program lacked sufficient technical rationale for us to judge the quality of the staff's review. Our Thermal-Hydraulic Phenomena Subcommittee had to perform a much more exhaustive review than should have been necessary in order to become convinced of the adequacy of the staff review. Future SERs should include more of the technical rationale used to make regulatory
- decisions.
Thermal-Hvdraulic Code Development Our review identified deficiencies in the existing suite of NRC thermal-hydraulic codes and databases. In order to ensure that the staff has an acceptable thermal-hydraulic analysis capability for confirmatory review of license applications and amendments, the NRC research l
program to improve and consolidate thermal-hydraulic codes should be continued.
l
! Code Validation Process The scope of the Westinghouse test and analysis program in support of the AP600 certification was extensive. However, the test program was completed prior to both the scaling analyses and the phenomena identification and ranking process. Because of this, we had considerable i difficulty in evaluating both the quality of the data used to validate the computer codes and the l scaling of the test results to AP600 conditions. The staff should develop guidance for l acceptable methods for scaline and uncertainty evaluation, such as the CSAU evaluation
! methodology, and for acceph J s utilization of int 6gral test data for the validation of computer ,
! codes. This is especially crw,el us we make more use of best-estimate models for emergency l
} core cooling system requirements, l
Main Control Room Staffina Levels i
The AP600 is designed to allow the reactor safety systems to remove decay heat without any required operator actions for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after the onset of a severe accident. In addition, the instrumentation and control systems and the human factors design of the main control room I
I provide improved access to information on plant operating parameters. This facilitates and speeds the operator's ability to diagnose problems. Based on these developments and the results of current human factors research, the staff should consider developing technical and
]
L .. __
3 '
policy guidelines for reviewing and approving licensee and applicant requests for reducing the main control room staffing levels below present regulatory limits.
In-Vessel Retention of Core Debris The AP600 design contains provisions to flood the reactor cavity to cover a significant portion of the reactor vessel. It was argued that this design provision could result in the removal of sufficient heat to prevent core debris from penetrating the vessel. Although this strategy was not part of the AP600 licensing basis, sr 2 a strategy might be included in future license amendment requests.
The staff identified weaknesses in the in-vessel core debris retention study used to support the AP600 application. The staff found that the results were quite sensitive to assumptions conceming the mass of metallic core debris in the vessel plenum and the magnitude of upward heat flux induced by vaporization of volatile constituents of core debris. In addition, analyses by the staff questioned assumptions made in the study conceming material properties. There ar-also unresolved questions about materials interactions, such as intermetallic reactions between molten Zircaloy cladding and the reactor vessel.
More experiments and analyses are needed before in-vessel core debris retention can be credited as part of the licensing basis. At this time, we believe in-vessel core debris retention should only be considered as a severe accident management strategy.
Catalvtic Hydronen Recombiners i
The design of the AP600 utilizes hydrogen recombiners to control the accumulation of hydrogen in the reactor containment following a design-basis accident. The AP600 design also containers hydrogen igniters to prevent hydrogen accumulation in the event of more serious beyond-design-basis accidents. The possible use of catalytic processes to control hydrogen concentrations in reactor containments is gaining popularity throughout the world.
The catalytic recombiners that are proposed for use in the AP600 are based on palladium or platinum dispersed on alumina. There is lacking, however, a good understanding of the vulnerabilities of these devices to the environment expected to exist following either design basis or severe accidents. There is not yet a good understanding of what would constitute persuasive qualification of a catalytic recombiner. We believe that the staff should establish better standards for the qualification of these devices.
Dr. Thomas S. Kress did not participate in the Committee's deliberation regarding extemal reactor vessel cooling.
Dr. Dana A. Powers did not participate in the Committee's deliberation regarding the results of Sandia National Laboratories' tests on qualification of passive autocatalytic recombiners.
4 Dr. George Apostolskis did not participate in the Committee's deliberation regarding the analysts performed by the Idaho National Engineering and Environmental Laboratory concerning external reactor vessel cooling.
Sincerely, r
gg &. * -
Dar's A. Powers Chairman
Reference:
Report dated July 23,1998, from R. L. Seale, Chairman, ACRS, to Shiriey Ann Jackson, Chairman, NRC,
Subject:
Report on the Safety Aspects of the Westinghouse Electric Com Application for Certification of the AP600 Passive Plant Design.
i i i l
l l
l