ML20138G225
| ML20138G225 | |
| Person / Time | |
|---|---|
| Issue date: | 04/28/1997 |
| From: | Ali S NRC (Affiliation Not Assigned) |
| To: | NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9705060223 | |
| Download: ML20138G225 (40) | |
Text
{{#Wiki_filter:. 0 f 44 g y" 4 UNITED STATES g j NUCLEAR REGULATORY COMMISSION i o WASHINGTON, D.C. 20666-4001 \\ April 28,1997 MEMORANDUM T0: The Files FROM: Syed Ali, Structural Engineer CivilEngineeringandGeosciencesbranch Division of Engineering, NRR
SUBJECT:
SUMARY OF MEETING WITH NEI ON RISK-INFORMED ISI DATE: April 15, 1997 i LOCATION: U.S. Nuclear Regulatory Commission 11545 Rockville Pike, Rockville, MD 20852 Staff members from the U.S. Nuclear Regulatory Commission (NRC) met with representatives of Nuclear Energy Institute (NEI) and the industry on April 15, 1997 at the NRC headquarters in Rockville, Maryland to discuss the coordination of Risk-Informed Inservice Inspection (RI-ISI) methodologies and the relevant American Society of Mechanical Engineers (ASME) Code Cases. A list of attendees is included as Attachment 1, " Industry Plan for Implementation of Improved ISI" as Attachment 2, " Westinghouse-Owners Group (WOG) RI-ISI (Proposed Code Case N-577)" as Attachment 3, and " Proposed Code Case N-578" as Attachment 4. The nuclear industry stated that due to the potential of significantly reducing radiation exposure to plant personnel, the industry has identified RI-ISI programs as a high priority activity. In support of this effort, the l industry has submitted two methodologies to the staff for the implementation of the RI-ISI. One methodology has been jointly developed by ASME Research and WOG and-the other methodology is being sponsored by Electric Power Research Institute (EPRI). Each of the two methodologies have their respective pilot plants. In addition, ASME is working on three Code Cases for alternate examination requirements to ASME Section XI, Division 1 for piping welds. Code Case N-577 is based on the WOG methodology, code case N-578 is based on the EPRI methodology, and the Code Cases N-560 currently utilizes EPRI methodology. This meeting was a follow-up to the meeting held on March 10, 1997, in which the industry presented the background and details of the ASME XI Code Case N-560. The purpose of this meeting was for the industry to address how it intends o integrate the three ASME Code Cases, the two RI-ISI methodologies, and the pilot plant submittals. The staff also requested that the industry present its schedule of pilot plant submittals. CONTACT: Syed Ali, DE/ECGB 415-2776 mzlph CAM g( x-OM N OG0024 W AE$$# H82Rac
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y e The Files 2-NEIandindustryrepresentativespresentedthebickgroundandexecutive summaries of ASME Code Cases N-560,.N-577,- and N-578,.their relationship with the industry methodologies _(WOG and EPRI)", and the' schedule.of the pilot plant submittals. NEI stated that ASME Code Case N-577 is based'on the WOG methodology, the corresponding. pilot' plant.is'Surry 1,'and.the pilot-submittalis scheduled for September 1997. NEI also stated that ASME Code Case N-578 is based on the EPRI methodology,: the corresponding pilot-plants are ANO-2 and Fitzpatrick, and the pilot submittals are scheduled for June to September 1997. NE! further stated that ASME Code Cas'e N-56011s based on an experience based approach with risk insights, it_ addresses only ASME Class 1 type B-J welds and its latest revision includes. selection criteria for welds based on both WOG and EPRI methodologies.: NEI stated that the' industry will proceed to evaluate Code Case N-560 for. application to Vermont. Yankee and ANO-1. The industry representatives and the NRC staff agreed that the staff will review the WOG and EPRI topical reports for compliance with the' staff guideline documents and upon resolution of its comments and concerns, the staff will approve these topical reports. The ASME Code Cases N-560, N-577, and N-578 will be revised simultaneously through the' ASME Code consensus process to be in compliance with the WOG and EPRI topical reports. The staff stated that following its determination of acceptability, the NRC would endorse the Code Cases with conditions and limitations. Upon the satisfactory review of the pilot plant submittals, the staff will approve the use of the RI-ISI programs pursuant to 10 CFR 50.55 a(a)(3)(f) provision of an acceptable alternative. The staff stated that the industry's proposed schedule to review the pilot plants' submittals may not be achievable due to resource constraints. In addition, the staff suggested that having only one RI-ISI methodology to review would expedite the review process. The meeting concluded with the agreement that the industry would provide an updated RI-ISI master plan schedule and the staff would clarify the licensing process to be used to review and approve RI-ISI programs for plants other than the pilot plants. Attachments: As stated. 1 I ,3 1 g ^/ i ~ m. e 'rN-F
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The Files
- N NE! and industry representatives presented the background and executive summaries of ASME Code Cases N-560, N-577, and N-578, their relationship with the industry methodologies (WOG and EPRI), and the schedule of the pilot plant submittals. NEI stated that ASME Code Case N-577 is based on the WOG methodology, the corresponding pilot plant is Surry 1, and the pilot
+ submittalis scheduled for September 1997. NEI also stated that ASME Code Case N-578 is based on the EPRI methodology, the corresponding pilot plants are ANO-2 and Fitzpatrick, and the pilot submittals are scheduled for June to September 1997. NEI further stated that ASME Code Case N-560 is based on an l experience based approach with risk insights, it addresses only ASME Class 1 type B-J welds and its latest revision includes selection criteria for welds based on both WOG and EPRI methodologies. NEI stated that the industry will j proceed to evaluate Code Case N-560' for application to Vermont Yankee and ANO-l. i The industry representatives and the NRC staff agreed that the staff will review the WOG and EPRI topical reports for compliance with the staff I guideline documents and upon resolution of its comments and concerns, the i staff will approve these topical reports. The ASME Code Cases N-560, N-577, j and N-578 will be revised simultaneously through the ASME Code consensus process to be in compliance with the WOG and EPRI topical reports. The staff i stated that following its determination of acceptability, the NRC would endorse the Code Cases with conditions and, limitations. Upon the satisfactory i review of the pilot plant submittals, the staff will approve the use of the RI-ISI programs pursuant to 10 CFR 50.55 a(a)(3)(f)- provision of an acceptable alternative. j Thestaffstatedthattheindustry'sbleduetoresourceconstraints.roposed sche'dule t plants' submittals may not be achieva In i addition, the staff suggested that having only one RI-ISI methodology to review would expedite the review process. t The meeting concluded with'the agreement that the industry.would )rovide an l updated RI-ISI master plan schedule and,the staff would clarify'tle: licensing i process to be used to review and approve,RI-isi programs for plants other than the pilot plants. i Attachments: As stated. + DISTRIBUTION: Central files (T-5 C3) PDR(LL-6) ECGB r/f _ NRR'Mailroom NRC Meeting Participants AThadani GHolahan MMayfield JJohnson GMillman Glainas JMurphy j WHodges LShao JStrosnider KWichman i RJones JAustin RWessman DFischer DOCUMENT NAME: G:\\ALI\\ SUM 0497 To receive a copy of this document, indicate in the box C= Copy w/o attachment / enclosure E= Copy with attachment /encIosure N = No copy OFFICE ECGB:DE E EC/IB/ der / 0 NAME SAlilM/} NNcii DATE 4/N/97 4/W/97 0FFICIAL RECORD COPY
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~.- ~ ----.- a..+.-..----.a.---...,.-n.-- ..-s- -_,s..a... --.,-n e-- = - UTY& l Industry Plan for l Implementation of l Improved ISI l i NRC Meeting April 15,1997 i h' 1
1 i l Meeting Purpose 4 l Present overall industry plans l with respect to use of ASME l code cases on improved ISI j Discuss NRC review priorities l and schedules i h 2
ASME Code Cases 3 i i X-577 - Risk informed approach l - Addresses all ASME piping classes l - Code case has aassed ASME l BPV main committee, balloted to i BNCS i j - Incorporated through WOG/ASME research methodology l - Applied at reference plant i - Pilot plant: Surry 1 (W) i j - Pilot submittal: September 1997 i h' 3 m
l ASME Code Cases l X-578 l - Risk informed approach l - Ac dresses all ASME piping l classes l - Code case has passec. ASME l main BPV committee, balloted to BNCS - Incorporated through EPRI l methodology l - Pilot plants: ANO-2 (CE) i Fitzpa': rick (BWR) - Pilot submittals June / September i 1997 h' 4 i
ASME Code Cases X-560 3 - Experience based approach with l risk insights - Addresses type B-J welds (ASME j class 1) - AS ME approved code case 1996 l - Presented to XRC ay ASME on 3/10 l i l l i f. di 5
f,. i ASME Code Cases l l l Code cases incorporate l improved examination volumes j for-RCS l Code cases provide for improved selection of inspection locations - current code: stress based - code cases: experience based inspection for cause Code cases provide equivalent safety to existing methods 1 h' 6
Consistency with Code Cases j Implementation methodologies l and pilot efforts are intended to j be. consistent with respective code cases i i - X-577 i - Pilot: WOG/ASME method i i - X-578 l - Pilot: EPRI methoc i l Detailed presentation to follow j h' f 7 i
L. l OverallIndustry Approach i Proceed with existing pilot submittals/ reviews for X-577, N-578 Assess methodologies against forthcoming XRC Reg Guides and SRPs on risk informed applications and ISI h' 8
l l OverallIndustry Approach l l l Pilots approved by NRC as l acceptable alternative per 10 i CFR 50.55a(aX3Xi) i - first quarter 1998 Request NRC endorsement of X-577 and N-578 (when final) l as proposed alternatives per 10 I l CFR 50.55a(aX3Xi), through j issuance of revision to Reg i Guide 1.147 h' 9
l OverallIndustry Approach l i l l Concurrent with ongoing NRC review efforts for X-577 and N-578, industry will proceed to l evaluate N-560 i - Application studies: Vermont Yankee ANO-1 Evaluate for consistency with approach of forthcoming Reg Guides, SRP h' 10
OverallIndustry Approach X-560 represents scope subset ofX-578 application t l S-560, Rev 1, when approved, l would represent scope subset of l X-577 application - ASME approval expected early l 1998 4 l l XRC review ofX-560 should be l simplified given X-577 anc X-l 578 pilot studies I f h' 11
e j OverallIndustry Approach i l l i l If application study shows X-l l 560 to be acceptable alternative I l to current code requirements, l request NRC endorsement l through 10 CFR 50.55a(aX3Xi) l and Reg Guide 1.147 February 12 meeting l (WOG/ASME research and l NRC) essentially depicted X-t 567 R1 application to Surry l E-71 12 L
Conclusions Improved ISI approaches l provide significant potential for l worker exposure reduction i j - ASME 3/10 aresentation to NRC on X-560 provided results of industry survey i l - 23,000 person-Rem exposure per interval for 50 units surveyed 1 N-577 and X-578 represent simi;ar potential for exposure l reduction i h' 13
d Conclusions l Substantial opportunity for l application of risk insights to prioritize resources and lower i worker exposures i i Should be priority application L with timely review i i l Will be elevated to Senior [ Management and Commission attention i 1 h' 14 t r
RISK-INFORMED ISI PROCESS EPRI and ASMEMOG Approaches SYSTEM SCOPE All Class 1,2, & 3 Piping Non-Code Piping important to Safety e + r l FAILURE MODE & EFFECTS ANALYSIS l. CONSEQUENCE ASSESSMENT Direct & Indirect Effects j Deterministic insights j FAILURE MODE ASSESSMENT Design & Operating Conditions q Industry Service Experience j Degradation Mechanisms i Other Deterministic insights ( j (PIPE SEGMENT DEFINITION) L J + r RISK EVALUATION Segment Consequence impact Assessment Core Damage t Containment integrity Segment Failure Likelihood Assessment u r m Segment Risk Categorization L + PLANT EXPERT PANEL integrated Plant Review Operational Experience t Other Deterministic insigh" + r SAFETY SIGNIFICANT SEGMENTS
RISK-INFORMED ISI PROCESS EPRIand ASMEMOG Approaches 1 4 r i SAFETY SIGNIFICANT SEGMENTS i , r r { SEGMENT INSPECTION j LOCATION SELECTION Procedure Criteria & Service Experience t ) , P EXAMINATION l j REQUIREMENTS Apply Prescriptive Requirements: Examination Method Examination Volume i Acceptance Criteria Evaluation Standard , e r Document Revised ISI Plan i I
A Industry ISI Plan N560 Application Approved li PP cation Submittal Code Case A Study 98 l l N577 Review / Approve Pilot Comment 3/98 l l 3 l N578 Submit Approve l Pilots 9/97 3/98 NRC Reg Guide 1.147 ASME Code Approved Industry Pilot Projects Case N577 6/97 Implementation Alternative per 10 CFR 50.55 ASME Code Approved a (3) ASME Process Case N578 6/97 i
.t .i Westinghouse Owners Group Risk-informed ISI UnK@m W R!!SM MBEiW Mf5 YT" W 2ashe asBeI
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Alex McNeill H. Virginia Power / ASME Working Group on Implementation of Risk-Based Examination wl NRC Meeting with NEl on Risk-informed j Inservice Inspection Programs April 15,1997 _ _ -. _ _ _ _.. _ _ _ _ _ _ - - _ _ _ = -. _ _ _ _
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d ..c ASME Code Case N-577 mawamamarmasam mia as a una:::::::a a Table of Contents - Scope and Responsibility - Examination and Inspection - Acceptance Standards - Repair / Replacement Procedures - System Pressure Tests - Records and Reports a These sections are the same in both Code Cases N-577 and N-578 - Most sections reference to current ASME Code a Pilot plant meets the criteria in these sections b
e ASME Code Case N-577 sedehnmanmeusemestri esa aa i se e EC I : :O 1 t m Appendix to ASME Code Case N-577 -Introduction and Scope 3 - Expert Panel Requirements j - Boundary Requirements - Risk-Informed Process j t - Evaluation of Risk-Informed Selections j - Use of Other Piping Inspection Programs i i f .f.
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ASME CODE CASE N-577/ SURRY PILOT COMPARISON PP'?M!MR!!IBMNEMF baa eis lillin se u; ak Z
- 0 SCOPE a CODE CASE
- Requires inclusion of systems in both PSA boundary and Section XI examination boundary. May include systems outside Section XI considered in PSA. m PILOT - 18 systems considered,10 systems all or portions of outside Section XI boundaries (non-class).
_.w .u... l ASME CODE CASE N-577/ SURRY PILOT COMPARISON lGiftedhA&Wdtin!!&Jhesedianists as edi sie be es 211 : :D PIPING SEGMENT ASSESSMENT m CODE CASE - Requires segment definition, calculations, I rankings using the FMECA technique, relevant u plant information including PSA. j u PILOT j - Currently ongoing, segment definitions under final review, segment failure estimates complete (stra tool), indirect consequences assessment complete, direct consequence under final review and risk ranking and segment categorization being ) completed. i
ASME CODE CASE N-577/ SURRY PILOT COMPARISON TFFWWEEERREEEBER3RRI tambi as e am in d 2 : : : O i STRUCTURAL ELEMENT ASSESSMENT i a CODE CASE - Requires assessment or calculation to rank and f select piping structural elements for examination. aPILOT - Developed process to categorize segments and determine appropriate inspection requirements (matrix). Developed statistical sampling model to aid in determining amount of inspection. (Application to RCS studied; remaining systems being completed) i
a ASME CODE CASE N-577/ SURRY PILOT COMPARISON TMwtWW@REeM5mMR**W57 WF TH ER3 ses
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- 0 EXPERT PANEL n CODE CASE
- Requires an expert panel to make final selections of systems, segments, and structural elements to be examined. nPILOT - Expert panel will incorporate Maintenance Rule ex aert panel augmented with experts associated with this application. Meetings to start in August time frame with program submittal end of September.
ASME CODE CASE N-577/ SURRY PILOT COMPARISON 28BiBbstanda8Bil!eE4ssi& ding tua: sdB kw at as 21 i . :--~O EXAMINATION METHOD m CODE CASE - Provides method, extent and frequency of examination in a table based upon the postulated failure. m PILOT - Examination requirements will be in accordance with the case
ASME CODE CASE N-577/ SURRY PILOT COMPARISON i s m e i a W a s A u s a $ isit e n s w a n t d B M is e u e a s ais; L a d a a . : 0 c Reevaluation of Selections a CODE CASE - Process requires reevaluation based upon examination results and new industry information (e.g., PSA changes, industry failures, etc.). m PILOT - Pilot will verify the effect of new information on the piping segments and structural elements and revise as appropriate
.1 ASME CODE CASE N-577/ SURRY PILOT COMPARISON unstreigneenagammasasa um ea 44 te a w I
- :O Conclusions m Surry pilot application is consistent with ASME Code Case N-577 m Surry pilot application and ASME Code Case N-577 are consistent with EPRI l
PSA Applications Guide n r
A Mand + Proposed Code Case N578 2 i Scope - i j Proposed Code Case - j Applies to Class 1,2 and 3 piping. Non SXI l may also be included. Pilots - JAF - 14 Systems (Class 1,2 and 3 as well as non SXI piping) ANO 10 Systems (Class 1,2, and 3 as well as non SXI piping)
Proposed Code Case N578 Segment Assessment - 4 i j Proposed Code Case - J j Requires consequence and degradation mechanism evaluations using deterministic i principles and risk assessment tools. I Pilots - JAF - Results of the segment assessment are l under review plant review. i ANO Segment assessment complete. i
3' .0 o O l Proposed Code Case N5-78 l Element Assessment - } l i i Proposed Code Case - Elements within each risk region are to be chosen based upon risk significance and service history. Pilots - JAF - Not Started. ANO Late April completion.
i j Proposed Code Case N578 Integrated Plant Review - i i 1 l Proposed Code Case - 4 { Requires integrated plant review including j design, probabilistic, operations, ISI and j welding disciplines as well as compilation and evaluation of service history. 2 i i Pilots - i d l JAF - Started on two systems. ANO Late April completion.
Proposed Code Case N578 ExaminatiegMetirod-4 i i i Proposed Code Case - l l Requirements provided in Table 2500-1. i i Pilots - JAF - Not Started i ANO Late April completion. 1 1 1, l 'I 4
Proposed Code Case N578 i i i i Summarv l e Both Pilot Plants are being conducted consistent l with proposed code case N578. e An assessment of the sampling percentages will l be conducted at the completion of the pilot plants. i i l b !}}