ML022760399

From kanterella
Jump to navigation Jump to search
Firstenergy Nuclear Operating Co., & Bnfl Westinghouse Electric Co., LLC, Meeting on Risk-Informed In-service Inspection(Is) Augmented High Energy Line Break (HELB)
ML022760399
Person / Time
Site: Beaver Valley
Issue date: 09/25/2002
From:
FirstEnergy Nuclear Operating Co, Westinghouse
To:
Office of Nuclear Reactor Regulation
References
Download: ML022760399 (22)
v • d • e


Text

e :

1,111111.191..

FENOC Meeting On Beaver Valley 2-NRC-WOG Risk-informed In-service Inspection (ISi)

Augmented High Energy Line

"(HELB)

September 02002 25, Break 2002 FirstEnergy Nuclear Operating Company

©2002 Westinghouse Electric Company LLC 9/25/02 xt I

I I I mill 1

Agenda I

I I

- History

- Lead Plant, Scope, and Approach

- Results

- NRC Review e Related WOG Risk-Informed Initiatives

  • Summary 9/25/02 mill

(

2 I

Introduction I

I Introduction and Opening Remarks To discuss and to obtain NRC feedback and direction on program results on the extension of the risk-informed ISI application to High Energy (HE) piping in the Break Exclusion Zone (BEZ) at FirstEnergy Nuclear Operating Company Beaver Valley Unit 2 the lead plant for the WOG Topical Report Addendum 9/25/02 MENMHH m~il 3

eI I

I I

Risk Informed Methods Applied to High Energy Line Break Augmented Inspections WCAP-14572 Revision 1-NP-A Addendum 1 - Markup 9/25/02 4

mllI 4

iN

History I1

"* WCAP 14572 Rev 1-NP-A Addendum 1 submitted 12/99 for augmented exams and HELB specifically

"* March 8, 2000 WOG/NRC met to address and discuss NRC questions (ADAMS ML0036900235) on the Addendum to WCAP-1 4572, Revision 1-NP-A for augmented exams and HELB specifically

"* Markup to Addendum 1 of WCAP-1 4572, Rev 1-NP-A issued to NRC 6/2000

"* Beaver Valley-2 identified to NRC to test methodology for HELB exams Meeting held between NRC/NEI/WOG/EPRI in May 2001; NRC expressed concern about consequence analysis that would be used to address HELB exams for break exclusion regions,' particularly where 100% selection per SRP or NUREG-0800 is required to meet GDC-4 intent NRC concerned about portioris of high energy pipingcurrently covered by augmented ISI where a break would violate single failure criteria, e.g., there is no way to isolate the failure of some main steam piping outside containment Treatment of dynamic effects from pipe failure must be consistent with NRC Standard Review Plan Chaptei" 3.6.2 Notification proposed to be done via periodic §50.59 summary report and SAR update per §50.71(e)

Meeting held September 2001 between NRC/FENOC/WOG presenting results of application of WCAP 14572 Methodology for Lead Plant Scope, Segment Definition, Direct Consequence Assessment, and Indirect Effects Assessment tasks.

Meeting held between NRC/NEI/WOG/EPRI in October 2001; technical issues and regulatory approach discussed.

Confirmed process for notification via §50.59 summary report and SAR update per §50.71(e) 5 9/25/02

Lead Plant, Scope, and Approach I I Lead Plant FirstEnergy Corporation Beaver Valley Unit 2 (FENOC BV2)

  • Scope RI-ISI Base Program ASME Class 1/Class 2 RI-ISI Piping BV2 High Energy (HE) Piping in the Break Exclusion Zone (BEZ) as defined in the UFSAR Inside Reactor Containment 9/25/02 Base-001

.-- ý -. _j Valve BEZ-001 p.-

p.-

BEZ-002 Main Steam Valve Room

-d Break Exclusion Zone (BEZ)

Service Service Building 6

mHlI

't

ý- ?

L

Lead Plant, Scope, an(J Approach

  • V *s 9

Approach WOG RI-ISI Methodology defined in Addendum to WCAP-1 4572, Revision 1 NP-A dated May 2000 Identical to WOG Risk-Informed In-Service Inspection Methodology defined in WOAP-14572 ReVision 1-NP-A Documentation process and requirements identical to base scope Safety concerns and regulatory oversight addressed via well-defined assessment process (1 OCFR50.59) 9/25/02 WEEN111I 7

Results e~e eq :.ee.

I I I

  • Scope and Segment Definition HE piping identified using UFSAR system list and plant piping line list 16 segments added to base scope segments 917 Base Scope Class 1 and 2 piping segments 933 Total segments considered in evaluation No additional segments defined as a result of indirect consequences 9/25/02 IIIII 8

Results eI 9

I I

Consequence Evaluation Direct Indirect

"* A walkthrough per WOG RI-ISI Methodology defined in addendum to WCAP-14572 Revision 1-NP-A (May 2000) was completed for all BEZ piping inside and outside of containment

"* Walkthroughs confirmed existing Design Basis documentation

"* Design Basis Break Locations exist at penetrations inside containment.

"* Penetration Design consistent inside and outside containment.

"* Potential new pipe breaks in the BEZ have designs in place to mitigate consequences in adjacent areas

  • Existing plant design reflects train separation

"* Systems required to perform safety related functions concurrently or consecutively were physically isolated

"* Current inspection locations have isolated or redundant impacts on safety in the event of a piping failure

  • To date no flaw indications found within BEZ scope segments Evaluated through plant PRA roN1!1 9

9/25/02

Results ezýnl 9

I Failure Probability Assessment - WinSRRA used to assess piping failure probability Risk Evaluation Segment combinations considered

  • 917 Base scope (Class 1 and 2 piping)
  • 933 segments in combined scope (Class 1, Class 2, and BEZ)
  • 72 BEZ segments (56 Base Scope/BEZ and 16 BEZ only)
  • Evaluated with no credit for non-BEZ augmented inspection program 933 segments in combined scope (Class 1, Class 2, and BEZ) 72 BEZ segments Relative ranking of segments did not vary as a result of combination considered Importance of segments did not vary as a result of combination considered 10 mI 9/25/02

Results e

e I

I I I

,Risk Results Summary Segment Combination CDF LERF With Op. Action Without Op. Action With Op. Action Without Op. Action Base Scope (917 Segments) 1.36E-06 1.90E-06 2.15E-08 2.33E-08 Base + BEZ (933 Segments) 1.36E-06 1.90E-06 2.15E-08 2.33E-08 BEZ (72 Segments) 1.07E-1 0 9.93E-11 2.62E-12 1.46E-12 9/25/02 lmH~g 11

Results I

I II I

mAmLW*L*hj L'i/guy gin Expert Panel Categorization Panel Members consistent with Base Scope Review Significant discussion on potential indirect effects due to flooding, etc.

confirmed indirect effects assessment completed as part of standard methodology application.

No change to base scope HSS/LSS rankings Base Scope Base/BEZ Scope 107 HSS Segments 107 HSS Segments 807 LSS Segments 823 LSS Segments 3 Not Used Segments 3 Not Used Segments 16 BEZ, which are non-Class 1/2 segments, all ranked LSS 8 segments ranked HSS during Base Scope Class 1/2 effort are part of BEZ pipe scope 9/25/02 III 12 m

Results e e :

9.

I Structural Element/Non-Destructive Examination (NDE) Selection Program Current Section XI Base Scope Base Sc ope and Augmented BEZ Base Scope and RI-ISI BEZ Program.

Current BEZ RI-ISI BEZ Exams 586 88 320 88 Exams

240, 8

Reduction NA 85%

NA 72%

NA 96%

9/25/02 4

mml~I 13

Results 0'Trio9.

I I

  • Change in Risk - Base Scope program conclusions remain applicable 4 Piping Class 2 Segments added for inspection (2 RCS and 2 SIS)

Reduction in overall plant risk Change In Risk Results Summary Segment Combination CDF LERF With Op. Action Without Op. Action With Op. Action Without Op. Action Section XM 2.81 E-07 8.24E-07 4.52E-09 6.41 E-09 Base Scope (917 Segments) 2.73E-07 8.02E-07 4.36E-09 6.32E-09 Base + BEZ (933 Segments) 2.73E-07 8.02E-07 4.36E-09 6.32E-09 Section Xl BEZ Segments 1.17E-10 1.11E-10 2.85E-12 2.OOE-12 RI-ISI BEZ Segments 1.17E-10 1.11E-10 2.85E-12 2.OOE-12

  • 1 OCFR50.59 - Example provided 9/25/02 14, IIIII

'4"

NRC Review Schedule eE I

I

  • Beaver Valley Base Scope Submittal
  • Provided to NRC in July 2002 e Approval Requested for February 2003 to support Spring 2003 Outage 10CFR50.59
  • Completion needed by February 2003 to support Spring 2003 Outage
  • WOG WCAP SER Need by December 2002 9/25/02 MEmNEII 15

eI I

I I

Related WOG Risk-Informed Initiatives 9/25/02 mHlI 16

WOG Risk-Informed ISI Subgroup

  • Two day training session held on the WOG RI-ISI Process on June 19 & 20, 2002
  • Working with EPRI and NEI on developing a. "White Paper" on the Living Program for RI-ISI
  • To ensure consistent application of the WOG RI-ISI methodology, the Subgroup expects to start peer evaluations of RI-ISI programs in 2003
  • Investigating applicationof risk-informed methods to leakage and analytical evaluation
  • Developed a process for conducting inquiries for interpretation of WCAP-14572 9/25/02 11111 17

Risk-Informed Repair &

Replacement

"* Provided support to the development and approval of ASME Code Cases N-658 and N-660 Tested Code Case N-658 as part of Option 2 pilot program at Surry Unit 1 and Wolf Creek Incorporated both RI-ISI methodologies into the ASME repair/replacement application Code Cases approved by ASME in July/August 2002

"* Demonstration showed that many Class 2 and 3 pressure retaining items may be categorized as low safety significant; some non-Code Class items may be high safety significant

"* Working with WOG on developing first applications 9/25/02 18

'V

.V Risk-Informing 10CFR50 Special Treatment Requirements - Option 2 0 e :

So9

"* Performed WOG Option 2 Pilot Program Applied to 2 systems at 2 plants (Wolf Creek/Surry)

- Tested NEI Guidance (NEI-00-04) and ASME Code Case N-658 Developed cost/benefit evaluation (submitted to NEI and NRC)

"* Provided feedback to NEI on industry guidance and to ASME on Code Case

  • Provided feedback through NEI and ASME to NRC on proposed 50.69 rule
  • Continuing to follow progress of industry guidance and NRC rulemaking 9/25/02 IN MINE I

19

Option 3 - LBLOCA

"* Initiating Frequencies

"* Petition for Rulemaking Submitted 9/25/02 I

I I I mill 20

Reactor Vessel In-Service Inspection Interval Extension

  • Joint CEOG-WOG Program Initial feasibility evaluations completed Program aligned with PTS efforts Pilot plants identified
  • ASME, Draft Code Case and White Paper presented at Sept 2002 ASME Section XI meetings ASME Review comments requested by October 11, 2002 Revised Code Case/White Paper presentation planned for December 2002 9/25/02 21

Summary

  • Beaver Valley Unit 2 BEZ application completed
  • WOG requests SER to be provided on outstanding WCAP Addendum Report
  • WOG continuing to support several beneficial risk-informed initiatives with industry, NRC and ASME 9/25/02 22

,,I'

-..-

Retrieved from "https://kanterella.com/w/index.php?title=ML022760399&oldid=5432428"