ML13284A111

Appendix AD - Area Walk-by Checklists (Awcs)

ML13284A111
Person / Time
Site:	Limerick
Issue date:	10/07/2013
From:	Exelon Generation Co
To:	Office of Nuclear Reactor Regulation
References
LG-13-108, RS-13-138
Download: ML13284A111 (33)

Text

Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Appendix AD Area Walk-By Checklists (AWCs)Table AD-1 provides the location of each walk-by area that was previously inaccessible and deferred, as well as a list of walkdown items associated with each area.AD-I Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Table AD-I. Summary of Area Walk-By Checklists AWC-U2-xx Area Description Elevation Location Components Within Area 50 Drywell 238 Room 473 2A-V212 51 Drywell 273 Room 473, 2S-T003, HV-041-2F022A Az 45 52 Drywell 286 Room 473, 2E-T003, PSV-041-2F013E 52_Drywell28 Az 90 53 Drywell 296 Room 473 HV-051-2F041A, HV-051-2F041C 54 Steam Chase 273,283 Room 587 HV-041-2F028A, HV-041-2F074A 55 Suppression Pool 217 Room 172 TE-041-201D AD-2 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Sheet I of 3 Status: YO No iQ Area Walk-By Checklist (AWC)Location:

Bldg. U2. DWrwll Floor El. 2M Room, Area, 473 nsrmutiebs for Completing Checklist This checklist may be used to document the results of the Area Walk-By near one or more SWEL items. The space below each of the following questions may be used to record the results of judgments and findings.Additional space is provided at the end of this checklist for documenting other comments.1. Does anchorage of equipment in the area appear to be free of YO NO3 UD- N/Al]potentially adverse seismic conditions (if visible without necessarily opening cabinets)?

2. Does anchorage of equipment in the area appear to be free of significant YH Nn Ul] N/AQ degraded conditions?

3. Based on a visual inspection from the floor, do the cable/conduit raceways and HVAC ducting appear to be free of potentially adverse seismic conditions (e.g., condition of supports is adequate and fill conditions of cable trays appear to be inside acceptable limits)?YO NO Un N/AE]4. Does it appear that the area is free of potentially adverse seismic spatial YM NO U[ N/AD interactions with other equipment in the area (e.g., ceiling tiles and lighting)?

'If the room in which the SWEL item is located is very large (e.g., Turbine Hall), the area selected should be described.

TIis selected area should be based on judgment, e.g., on the order of about 35 feet from t S i AD-3 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Area Clhcklit (AWC)Sheet 2 of 3 Status: YO NO UD Location:

Bldg. 02. QMW Floor El. 230 Room, Areal 473 .5. Does it appear that the area is free of potentially adverse seismic interactions that could cause flooding or spray in the area?6. Does it appear that the area is free of potentially adverse seismic interactions that could cause a fire in the area?7. Does it appear that the area is free of potentially adverse seismic interactions associated with housekeeping practices, storage of portable equipment, and temporary installations (e.g., scaffolding, lead shielding)?

Card 111, 'SCA~&CiA~

SIS S ~ 2 YN NO UD N/AO YM NO U1 N/AO Ye NO Ur N/A0 8. Have you looked for and found no other seismic conditions that could adversely affect the safety functions of the equipment in the area?YO NND Un Commnts (Additional pages may be added as necessary)

Evaluated by: Tracey Qfalinai -1=&-? Date:_______

iesm Lucas l Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Area Walk-By Checklist (AWC)Sheet 3 of 3 Status: YO N-- U--Location:

Bldg. U2. Drywell Floor El. 238 Room, Area, 473 Photographs r'~ote: iNote: AD-5 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Sheet I of 3 Status: YO No uD Ares Walk-By Checklist (AWC)Location:

Bldg. DOJMML Floor El. 273 Room, Area' Az 45. 473 Instructions for Completing Checklist This checklist my be used to document the results of the Area Walk-By near one or more SWEL items. The space below each of the following questions may be used to record the results of judgments and findings.Additional space is provided at the end of this checklist for documenting other comments.1. Does anchorage of equipment in the area appear to be free of YO N[3 U[3 N/Arl potentially adverse seismic conditions (if visible without necessarily opening cabinets)?

2. Does anchorage of equipment in the area appear to be free of significant YO ND UrD N/AU degraded conditions?

3. Based on a visual inspection from the floor, do the cablelconduit raceways and HVAC ducting appear to be free of potentially adverse seismic conditions (e.g., condition of supports is adequate and fill conditions of cable trays appear to be inside acceptable limits)?4. Does it appear that the area is free of potentially adverse seismic spatial interactions with other equipment in the area (e.g., ceiling tiles and lighting)?

YCR NO UD NIAn YC NE3 UD N/AD3'I If the room in which the SWEL item is located is %wy large (e.g., Turbine Hail), the area selected should be described.

This selected area should be based on judgment, e.g., on the order of about 35 feet from the SWEL item. AD-6 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Area Walk-By Checklist (AWC)Sheet 2 of 3 Status: YO NO ul Location:

Bldg. DQiye/ Floor El. 2"/3 Room, Area 1 A..45, 47Z 5. Does it appear that the area is free of potentially adverse seismic interactions that could cause flooding or spray in the area?6. Does it appear that the area is free of potentially adverse seismic interactions that could cause a fire in the area?7. Does it appear that the area is free of potentially adverse seismic interactions associated with housekeeping practices, storage of portable equipment, and temporary installations (e.g., scaffolding, lead shielding)?

YM NO UQ N/AD YO NO UO N/An 8. Have you looked for and found no other seismic conditions that could adversely affect the safety functions of the equipment in the area?YO NOU[3 Com ent (Additional pages nay be added as necessary)

Evaluated by: Trams Qulaatwr Al i Date:/'Je L. q Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Area Walk-By Checklist (AWC)Sheet 3 of 3 Status: Y[ N-- U--Location:

Bldg. Drywell Floor El. 273 PhotoL~raDhs Room, Area, Az 45, 473 Note: iNote: I Note: AD-8 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Area Walk-By Checklist (AWC)Sheet I of 3 Status: YN NCI UQ Location:

Bldg. U2 IL Floor El. 2M. Room, Area' Az 90. 473 Instrueions for Completing Checklist This checklist may be used to document the results of the Area Walk-By near one or more SWEL items. The space below each of the following questions may be used to record the results of judgments and findings.Additional space is provided at the end of this checklist for documenting other comments.1. Does anchorage of equipment in the area appear to be free of potentially adverse seismic conditions (if visible without necessarily opening cabinets)?

YO NO UON/AE 2. Does anchorage of equipment in the area appear to be free of significant YM Ni UO N/AD degraded conditions?

3. Based on a visual inspection from the floor, do the cable/conduit raceways and HVAC ducting appear to be free of potentially adverse seismic conditions (e.g., condition of supports is adequate and fill conditions of cable trays appear to be inside acceptable limits)?4. Does it appear that the area is free of potentially adverse seismic spatial interactions with other equipment in the area (e.g., ceiling tiles and lighting)?

YO NO UD N/AO YO NO UO N/AO I If the rmoo in which the SWEL item is located is very large (e.g., Turbine Hall), the area selected should be described.

This selected area should be based on judgment, e.g., on the order of about 35 feet from the SWEL item. AD-9 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Ae Walk-By Checklist (AWC)Sheet 2 of 3 Status: YO No r'Location:

Bldg. U1.Davmwli Floor El. 2M8 Room, AWrea ,z 9.0 47 5. Does it appear that the area is free of potentially adverse seismic interactions that could cause flooding or spray in the area?6. Does it appear that the area is free of potentially adverse seismic interactions that could cause a fire in the area?7. Does it appear that the area is free of potentially adverse seismic interactions associated with housekeeping practices, storage of portable equipment, and temporary installations (e.g., scaffolding, lead shielding)?

YO NO UO N/AQ YM NO UR N/All YM NO UO N/AR 8. Have you looked for and found no other seismic conditions that could adversely affect the safety functions of the equipment in the area?YO NO U(: Commnts (Additional pages may be added as necessary)

Evaluated by: T Date: AL'- I Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Area Walk-By Checklist (AWC)Sheet 3 of 3 Status: YE N-] U-]Location:

Bldg. U2. Drywell Floor El. 286 Room, Area' Az 90, 473 Photographs Note: AD-11 Limerick Generating Station Unit 2 Correspondence No.: RS-1 3-138 Sheet I of 3 Status: Y0 Nr' uQ Area Walk-By Checklist (AWC)Location:

Bldg. Drywal Floor El. 29 Room. Area, 473 Inswuctions for Competing Cbecdibst This checklist may be used to document the results of the Area Walk-By near one or more SWEL items. The space below each of the following questions may be used to record the results of judgments and findings.Additional space is provided at the end of this checklist for documenting other comments.1. Does anchorage of equipment in the area appear to be free of potentially adverse seismic conditions (if visible without necessarily opening cabinets)?

YO NO UO N/AO 2. Does anchorage of equipment in the area appear to be free of significant YO N[ UDl N/AD degraded conditions?

3. Based on a visual inspection from the floor, do the cable/conduit raceways and HVAC ducting appear to be free of potentially adverse seismic conditions (e.g., condition of supports is adequate and fill conditions of cable trays appear to be inside acceptable limits)?YC NO UD N/AO 4. Does it appear that the area is free of potentially adverse seismic spatial YIN NO U13 N/AD interactions with other equipment in the area (e.g., ceiling tiles and lighting)?

'If the room in which the SWEL item is located is vzy large (eqg., Turbine Hall), the area selected should be descrined.

This selected area should be based on judgment, e.g., on the order of about 3S feet from the SWEL item. ,/' l.J- 14 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Sheet 2 of 3 Status: YO NO UQ Aa Walk-By ChWcldlt (AWC)Location:

Bldg. DQOM Floor El. 296 Room, Areal 473 5. Does it appear that the area is free of potentially adverse seismic interactions that could cause flooding or spray in the area?6. Does it appear that the area is free of potentially adverse seismic interactions that could cause a fire in the area?7. Does it appear that the area is free of potentially adverse seismic interactions associated with housekeeping practices, storap of portable equipment, and teaporary installations (e.g., scaffolding, lead shielding)?

A casMfid ucke k wa bund anwhed to the sntura/ stel near fe X.59A penfutton. (azhnuth 270 degmae) Couklpo*e**d~

Wa and a Sae related eeume bw (i.e. SRVs). -Isue addrsed as per IR 149W15.YO NO UD N/AO YO NO UO N/AO YO NO UO N/AO 8. Have you looked for and found no other seismic conditions that could YO NO Ur adversely affect the safety functions of the equipment in the area?Comments (Additional peges nay be added as necessry)Evaluated by: Trace G&MMOhe D 2~ (a ~ late: 911 Jewsj~ IUM t- I it Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Area Walk-By Checklist (AWC)Sheet 3 of 3 Status: YZ NEI U[-I Location:

Bldg. U2. Drvwell Floor El. 296 Room, Area, 473 Photographs Note: Note: AD-14 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Am Walk-By C cldlt (AWC)Sheet I of 3 Status: YO NO uQ Location:

Bldg. U2. M I Floor El.273 & 283 Room, Area' 587 Ingrudi..

for Cmmuphle-1 (3aeckis This checklist may be used to document the results of the Area Walk-By near one or more SWEL items. The spece below each of the following questions may be used to record the results of judgments and findings.Additional space is provided at the end of this checklist for documenting other comments.1. Does anchorage of equipment in the area appear to be free of potentially adverse seismic conditions (if visible without necessarily opening cabinets)?

2. Does anchorage of equipment in the area appear to be free of significant degraded conditions?

YCM NO IJO N/AQ YO N[3UE3N/A[3

3. Based on a visual inspection from the floor, do the cable/conduit raceways and YC N[3 U30 N/AO HVAC ducting appear to be free of potentially adverse seismic conditions (e.g., condition of supports is adequate and fill conditions of cable trays appear to be inside acceptable limits)?4. Does it appear that the area is free of potentially adverse seismic spatial interactions with other equipment in the area (e.g., ceiling tiles and lighting)?

YJMNEIUO NIAO I If the room in which the SWEL item is located is very large (e.g, Turbine HaR) the arm selected should be daed .ThIs selected area should be based on judgmeat, e.g., on the order of feet from the SWEL ftm AD-1 5 Limerick Generating Station Unit 2 Correspondence No.: RS-1 3-1 38 Sheet 2 of 3 Status: YO N[ u-Are. Walk-By Chwcldla (AWC)Location:

Bldg. A Floor El. 273 &2. Room, Area' WIL 5. Does it appear that the area is free of potentially adverse seismic interactions that could cause flooding or spray in the area?6. Does it appear that the area is free of potentially adverse seismic interactions that could cause a fire in the area?7. Does it appear that the ar is free of potentially adverse seismic interactions associated with housekeeping practices, storage of portable equipment, and temporary installations (e.g., scaffolding, lead shielding)?

YO NO UO NIAO YZ NO UO NWAO YO NO UO N/JAO 8. Have you looked for and found no other seismic conditions that could adversely YO NO Uf affect the safety functions of the equipment in the area?CommehiL(Additional pages nay be added as necessary)

Evalatedby:T A01 /ýXVJDate:

J"0Lucas Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Area Walk-By Checklist (AWC)Sheet 3 of 3 Status: YZ NEI- U--Location:

Bldg. U2, Steam Chase Floor El. 273 & 283 Room, Area' 587 Note: Note: Note: INote: AD-17 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Area Walk-By Checklist (AWC)Sheet I of 3 Status: YO NO LU[]Location:

Bldg. & Floor El. 217 Room, Area, 172.hutmcdons for Complting Ciecklist This checklist may be used to document the results of the Area Walk-By near one or more SWEL items. The space below each of the following questions may be used to record the results of judgments and findings.Additional space is provided at the end of this checklist for documenting other comments.1. Does anchorage of equipment in the area appear to be free of potentially adverse seismic conditions (if visible without necessarily opening cabinets)?

2. Does anchorage of equipment in the area appear to be free of significant degraded conditions?

3. Based on a visual inspection from the floor, do the cabletconduit raceways and HVAC ducting appear to be free of potentially adverse seismic conditions (e.g., condition of supports is adequate and fill conditions of cable trays appear to be inside acceptable limits)?4. Does it appear that the area is free of potentially adverse seismic spatial interactions with other equipment in the area (e.g., ceiling tiles and lighting)?

YO NO UD N/AD YIM NOl LUD N/AE]YC! NO3 U[3 N/AU YJM Nil UI- N/AD3 I If the room in which the SWEL item is located is very large (e.g., Turbine Hall), the area selected should be described.

This selected area should be based on judgment, e.g., on the order of about 35 feet from the SWEL itm AD-18 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Sheet 2 of 3 Status: YO NEI U[Q Arm WalkBy Cheoiat (AWC)Location:

Bldg. & Floor El. 217 Room, Area' IM.5. Does it appear that the are is free of potentially adverse seismic interactions that could cause flooding or spray in the area?6. Does it appear that the area is free of potentially adverse seismic interactions that could cause a fire in the area?7. Does it appear that the area is free of potentially adverse seismic interactions associated with housekeeping practices, storage of poutable equipment, and temporary installations (e.g., scaffolding.

lead shielding)?

Y9 NO UO N/AO Y11 NO UO N/AD YO NO UO NIAO 4.8. Have you looked for and found no other seismic conditions that could adversely affect the safety functions of the equipment in the area?YM NOUO Ceflmmft (Additiokw pages nay be added as necessary)

Evaluated by: Tramv GRI~gw B Dt: Z Jo- LUM A --

Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Area Walk-By Checklist (AWC)Sheet 3 of 3 Status: Y[ NEI U-Location:

Bldg. Suppression Pool Floor El. 217 Room, Area' 172 Photographs Note: f,4ote: AD-20 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Appendix AE Plan for Future Seismic Walkdown of Inaccessible Equipment Two (2) items were not accessible during the follow-on walkdowns.

These items will be walked down during a time when the equipment is accessible.

Table AE-2 summarizes the reasons these items are inaccessible during normal plant operation and notes the Limerick Generating Station Issue Report IR that has been written to track completion of the Seismic Walkdown for this item.Per Section E.2, supplemental internal inspections of certain cabinets are required due to clarification provided by the NRC after the online seismic walkdowns were completed.

Therefore the items identified on Table AE-2 require a complete inspection, including internal inspection for other adverse seismic conditions.

The Area Walk-By of the vicinity of this equipment was completed previously and was documented in Appendix D of this report.Table AE-2. Inaccessible and Deferred Equipment List Component Reason for Action Resolution/

Milestone ID Description Inaccessibility ID (IR) Status Completion A RPS & UPS Equipment December 2A-D160 Distribution Panel normally 1436078 Scheduled Static Inverter energized B RPS & UPS Equipment December 2B-D160 Distribution Panel normally 1436081 Scheduled 2013 Static Inverter energized AE-1 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Appendix AF Peer Review Report This appendix includes the Peer Review Team's report on the follow-on seismic Walkdowns and Walk-Bys.AF-1 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Peer Review Report for Near Term Task Force (NTTF) Recommendation

2.3 Seismic

Walkdown Inspection of Limerick Generating Station Unit 2 Annex A May 20. 2013 Peer Reviewers:

Jagdish Narula (Team Leader)Robert B. Wehrman Jagdish Narula I o Peer Review Team Leader Signature Date AF-2 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Contents I Introduction

........................................................................................................

AF-4 1 .1 O v e rv ie w .....................................................................................................................

A F -4 1 .2 P e e r R e v ie w e rs ...........................................................................................................

A F -4 1.3 S W E L D eve lo pm e nt ....................................................................................................

A F -5 1 .4 S e ism ic W a lkd ow n ......................................................................................................

A F-5 2 Peer Review -Selection of SSCs ...............................

AF-6 2 .1 P u rp o s e .......................................................................................................................

A F -6 3 Review of Sample Checklist

& Area W alk-Bys ................................................

AF-7 3 .1 P u rp o s e .......................................................................................................................

A F -7 3.2 Follow-on Seismic W alkdown Checklists

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AF-7 3 .3 E va lua tio n o f F ind ing s .................................................................................................

A F -9 4 Review of Licensing Basis Evaluations

.........................................................

AF-IO 5 Review Final Subm ittal Report & Sign-off ................................................

AF-11 6 References

.......................................................................................................

AF-12 AF-3 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 IIntroduction

1.1 OVERVIEW

This report documents the independent peer review for the Near Term Task Force (NTTF) Recommendation 2.3: Seismic Walkdown, Annex 'A' follow-on activities performed by Exelon Limerick Generating Station Engineering Department for Unit 2 of Limerick Generating Station (LGS). This peer review includes review of pages iii and vi of Report RS-12-171 as updated to reflect Annex 'A'. The peer review addresses the following activities:

• Review of the selection of the structures, systems, and components, (SSCs)included in this follow-on Seismic Walkdown.

The SWEL was not revised;therefore a review of the selection of SSCs was not required." Review the checklists of the items completed during the follow-on Seismic Walkdowns and Area Walk-Bys.* Review of any licensing basis evaluations.

No new licensing basis evaluations were performed; therefore a review of licensing basis evaluations was not required." Review of the decisions for entering the potentially adverse seismic conditions identified during the follow-on walkdowns into the plant's Corrective Action Program (CAP)." Review of the final submittal report.* Summarize the results of the peer review process in the final submittal report.1.2 PEER REVIEWERS The Peer Reviewers for LGS, Unit 2 are Jagdish Narula and Robert Wehrman, both Exelon engineers.

Mr. Narula is the Peer Review Team Leader, per the EPRI Seismic Walkdown Guidance (Reference 1). As Peer Review Team Leader, he was responsible for the entire peer review process, including completion of the final peer review documentation in this report. The Peer Reviewers' qualifications are briefly summarized as follows: " Mr. Narula is a degreed civil/structural engineer and has over 20 years of nuclear power experience.

Mr. Narula has been trained as an EPRI Seismic Walkdown Engineer (SWE). He is qualified for Exelon Component Seismic Qualification, Exelon Structural Activities and is knowledgeable in seismic/structural design. Mr. Narula is a registered professional engineer.* Mr. Wehrman is a degreed mechanical engineer and has over 6 years of nuclear power experience, and is knowledgeable in seismic/structural design.AF-4 Limerick Generating Station Unit 2 Correspondence No.: RS-1 3-138 This peer review covered information provided in Annex A. A selection of Unit 2 Seismic Walkdown Checklists (SWCs) and Area Walk-By Checklists (AWCs) were reviewed.Observations of walkdowns were performed.

Review of the final report was performed and verified to include the required information for Annex A. No issues were identified which challenged the current licensing basis.1.3 SWEL DEVELOPMENT See Section A4 of Annex A, no changes were made to the SWEL for the follow-on walkdowns.

1.4 SEISMIC

WALKDOWN The peer review of the follow-on seismic walkdowns was performed by Mr. Narula and Mr. Wehrman. The review included Seismic Walkdown Checklists (SWCs) and Area Walk-By Checklists (AWCs) applicable to the equipment including checklists, photos, and drawings where applicable.

Interviews were conducted with SWE team to assess conduct of the walkdowns and adherence to the EPRI Seismic Walkdown Guidance (Reference 1). The discussion of the review of the SWCs and AWCs is provided in Section 3.The assessment of condition reports (IRs) with respect to current licensing basis is provided in Section 4. These assessments and their outcomes were also discussed with the SWE inspection team in order to completely understand the issues.AF-5 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 2 Peer Review -Selection of SSCs 2.1 PURPOSE The purpose of this section is to describe the process to perform the peer review of the selected structures, systems, and components, (SSCs) that were included in the Seismic Walkdown Equipment List (SWEL).However, this peer review is performed for the SSCs that were previously inaccessible and were completed during the follow-on Seismic Walkdowns and Area Walk-Bys.

There are no changes to the SWEL, so the selection of new SSCs does not apply in this case.AF-6 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 3Review of Follow-On Seismic Walkdown & Area Walk-By Checklists

3.1 OVERVIEW

A peer review of the remaining (Annex 'A') Seismic Walkdowns was performed by Mr.Jagdish Narula and Mr. Robert Wehrman. The Peer Review Team reviewed Seismic Walkdown Checklists (SWCs) and Area Walk-By Checklists (AWCs) and interviewed the walkdown team members regarding details in checklists.

3.2 FOLLOW-ON SEISMIC WALKDOWN CHECKLISTS Greater than 25% of the Limerick Generating Station Unit 2 equipment inspected during the follow-on walkdown are included in the peer review, see follow-on Seismic Walkdown, Area Walk-By Checklists presented below: AF-7 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 Table A3-1. Follow-On Seismic Walkdown Checklists Component ID (Applicable AWC Description Location Observations Number)t Reactor No issues with the SWC or HV-041-2F074A FDWTR Inboard Isolation Enclosure, Room AWC applicable to this (AWC U2-54) Valve 587, El. 283' equipment or its conclusions were identified.

No issues with the SWC or 2A-V212 DW Chiller Fan Eactor AWC applicable to this (AWC U2-50) 473, El. 238R equipment or its conclusions were identified.

E Main Steam Relief No issues with the SWC or 2E-T003 Valve (MSRV) Enclosure, oom AWC applicable to this (AWC U2-52) Accumulator Tank 473, El. 286' equipment or its conclusions were identified.

Table A3-2 Follow-On Area Walk-By Checklists Area Area Description Components Observations Within Area A scaffold knuckle was found attached to the 50 Drywell 2A-V212 structural steel near the X-59A penetration above the SRVs on elevation 295.No issues with the SWC or 2E-T003, PSV-041- AWC applicable to this 52 Drywell 2F013E equipment or its conclusions were identified.

No issues with the SWC or 53 Drywell HV-051-2F041A, AWC applicable to this FIV-051-2F041C equipment or its conclusions were identified.

AF-8 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 3.3 EVALUATION OF FINDINGS There were no issues that challenged the licensing basis.The outcome of the walkdowns indicated that there were no major concerns from the inspections conducted.

One (1) "Potentially Adverse Seismic Condition" was identified during the Area Walk-Bys.

A scaffold knuckle was found attached to the structural steel in the drywell near the X-59A penetration above the SRVs on elevation 295. This was not an immediate concern as Limerick Unit 2 was in a refueling outage. This issue was entered into the stations Corrective Action Program and the issue was resolved prior to the start-up of Unit 2. The peer reviewers consider the engineering judgments made by the inspectors as appropriate and acceptable, per the EPRI Seismic Walkdown Guidance.Further, all the outstanding uncompleted corrective action issues in Report RS-12-171 have been addressed, as shown in Tables A5-2 and A5-3 of Annex 'A'.AF-9 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 4Review of Licensing Basis Evaluations There were no instances identified during the follow-on walkdowns where evaluated components could not readily be shown to meet the plant seismic licensing basis.Accordingly, no licensing basis evaluations to determine if equipment complied with current seismic licensing basis requirements were required.

However, there were some anomalies or conditions adverse to quality that were identified during the follow-on walkdowns.

Tables A5-2 and A5-3 of Annex 'A' provide a list of the anomalies encountered during the Unit 2 follow-on seismic walkdown and area walk-by inspections and how they were addressed.

AF-10 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 5 Review Final Submittal Report & Sign-off The entire final supplemental report of Annex A has been reviewed by Mr. Jagdish Narula and Mr. Robert Wehrman and found to meet the requirements of EPRI Seismic Walkdown Guidance, EPRI Report 1025286[11.

Annex A covers the necessary open items from the original submittal.

The Peer Review determined that the objectives and requirements of the 50.54(f)1 2 l letter are met for Annex A. Additionally, the efforts completed and documented within the final submittal report are in accordance with the EPRI guidance document.AF-11 Limerick Generating Station Unit 2 Correspondence No.: RS-13-138 6References

1. EPRI Technical Report 1025286, Seismic Walkdown Guidance for Resolution of Fukushima Near-Term Task Force Recommendation 2.3: Seismic, dated June 2012.2. NRC Letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated March 12, 2012, ADAMS Accession Number ML12053A340 AF-12