NG-13-0368, NextEra Energy Duane Arnold, LLC - Revision to Seismic Walk Down Report
| ML13260A078 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 09/13/2013 |
| From: | Richard Anderson NextEra Energy Duane Arnold |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NG-13-0368 | |
| Download: ML13260A078 (12) | |
Text
NEXTera ENERGY-'
,ý; ~A RN OLD September 13, 2013 NG-1 3-0368 10 CFR 50.54(f)
U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Duane Arnold Energy Center Docket No. 50-331 Renewed Op. License No. DPR-49 NextEra EnercqV Duane Arnold, LLC's Revision to Seismic Walk Down Report
References:
- 1) 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 (ML12073A348)
- 2) Letter, R. Anderson (NextEra Energy Duane Arnold, LLC) to NRC, "Response to NRC 10 CFR 50.54(f) Request for Information Regarding Near-Term Task Force Recommendation 2.3, Seismic, NG-12-0467, dated November 27, 2012 (ML123341288)
- 3) NRC Letter, Summary of the August 1,2013, Public Conference Call on the Delayed Inspection Items Associated with Japan Lessons Learned Near-Term Task Force Recommendation 2.3 Seismic Walkdowns, dated August 14, 2013 (ML13218B361)
On March 12, 2012, the Nuclear Regulatory Commission (NRC) issued Reference 1 requesting information on several topics including information associated with Near-Term Task Force Recommendation 2.3 for a seismic walk down report. In Reference 2, NextEra Energy Duane Arnold, LLC provided the requested information. Reference 2 included a list of components selected for inspection and a list of those components that were not accessible for inspection.
On August 1, 2013, the Staff held a public meeting to discuss the status of deferred equipment inspections (Reference 3). During this meeting, the Staff indicated that the intent of Recommendation 2.3 was to be an interim action with a preferred completion date for inspections no later than the end of 2014. Some components selected for inspection involve energized equipment that will not be accessible for inspection until after the end of 2014. Consequently, the Staff Aýýj NextEra Energy Duane Arnold, LLC, 3277 DAEC Road, Palo, IA52324
Document Control Desk NG-13-0368 Page 2 of 2 recommended that licensees evaluate their list of deferred inspections to determine if suitable substitute components were available for inspection earlier, or alternatively, provide justification that sufficient information has been collected to meet the intent of the walk down guidance documents. The enclosure to this letter provides revised information consistent with the Staff's request in Reference 3.
This letter makes the following new commitment. NextEra Energy Duane Arnold, LLC commits to submitting, within 90 days after the end of the next scheduled refueling outage (breaker closure), a final seismic walkdown report as described in Reference 3.
If you have any questions or require additional information, please contact Ken Putnam at 319-851-7238.
I declare under penalty of perjury that the foregoing is true and correct.
Executed on September 13, 2013 RC~-4hrd L. nderso Vice President, Duane Arnold Energy Center NextEra Energy Duane Arnold, LLC - Justification of Substitutions and Alternative Inspections - Revised Attachment A "Seismic Walkdown Equipment List (SWEL)" - Revised Table E-1 "Summary of Inaccessible Equipment"
Attachment 1 to NG-13-0368 Justification of Substitutions and Alternative Inspections 2 pages follow
Attachment 1-Justification of Substitutions and Alternative Inspections 1A3 Alternative Inspection- 1A3 was selected in the component category of 4160 Volt switchgear. The current inspection of 1A3 will be limited to external inspections and area walk by inspections. Access to the interior of 1A3 can only be safely performed when the switchgear in de-energized. No suitable period of time is available in the near term period. As an alternative, the records for this component have been reviewed. Detailed inspections of the seismic characteristics of 1A3 were performed in 1995 during implementation of USI A-46. The as built configuration, roughly 20 years after initial plant construction, was verified and found to be seismically acceptable. The component is in a controlled, mild environment where degradation of the seismic anchorage is unlikely. Periodic structures monitoring, under the maintenance rule, of other equipment in the same room have observed generally good results in the period since previous walk downs. No plant modifications to the seismic anchorage have occurred and the components are not normally accessible, so inadvertent changes are not likely.
Based on this review, combined with inspections of other equipment in 2012, sufficient information is available on seismic equipment to meet the intent of the walkdown guidance. Therefore, no additional inspections will be performed on this component.
1X031 Substitution-IX091 is a similar component type of 480 Volt transformer.
1X091 will be accessible for inspection in 2013 rather than 2016 and therefore is a preferred alternative to allow earlier inspection.
1D42 Substitution-1 D41 is a similar component type of 250 VDC Motor Control Center. 1 D41 will be accessible for inspection in 2014 rather than 2016 and therefore is a preferred alternative to allow earlier inspection.
1B42 and 1B46 Alternative Inspection-These 480VAC Motor Control Centers (MCCs) have been inspected for seismic anchorage and area walk by and found to be acceptable. However, not all sections of the MCCs could be opened under normal plant conditions to allow for internal inspections. Specifically, there are five MCCs (1B42, 1B91, 1B46, 1D41, and 1D14) listed in the SWEL list. As documented on the Seismic Walkdown Checklist (SWC) for 1 B42, three compartments of this MCC were opened for internal inspection. Similarly, the SWC for MCC 1 B46 shows two compartments were opened for internal inspection. No adverse seismic conditions have been observed in the MCCs inspected to date.
Prior to the end of 2014, MCCs 1B91, 1D41, and 1 D14 will become available for inspection, as plant conditions permit, and it is anticipated that all of their compartments will be opened and internal inspection will be performed. The internal inspections of the sample of MCC compartments described above, along with the internal inspections performed for the other equipment classes such as distribution panels, battery chargers, and the control panels, are judged to be Page 1 of 2
sufficiently representative to meet the intent of the walkdown guidance. Therefore, no additional inspections will be performed on these two components.
The final seismic walkdown report will be submitted within 90 days after the end of the next scheduled refueling outage (breaker closure) and will include the results of the Motor Control Center inspections.
Page 2 of 2
Attachment 2 to NG-13-0368 Revised Attachment A "Seismic Walkdown Equipment List (SWEL)"
4 pages follow
ATTACHMENT A Seismic Walkdown Equipment List (SWEL) 5 Safety Enhanced Item Equip Equipment SUS Anc. Equipment Function For Area Major No. Class ID Equipment Description No. Y/N Location Note 4 IPEEE Walkby No. Mod? Notes I 1 1B42 480VAC CB MCC 6.00 Y CB-757 3,4,5 Y CB-02 If,2,3,4 2 1 IB91 480VAC intake MCC 6.10 Y IS-767 3:4 IS-02 Ie,2,4 3 1 1B46 480VAC MCC 6.00 Y PH-761 34 Y PH-01 If,2,4 4 1 ID41 250 VDC MCC 88.00 Y RB-757 3 RB-13 a2,4 5 1 1D14 125VDC RCIC MCC 2.50 Y RB-786 3,5 RB-15 le,2,4 6 2 1B09 480VAC IS Load Center 5.10 Y IS-767 3,4 IS-02 2,4 7 3 IA3 4160VAC Switchgear 4.00 Y CB-757 1,2,3,4,5 CB-01 lb,2,4 8 4 1X91 480VAC Transformer 5.00 Y IS-767 1,2,3,4,5 IS-02 I c,2,4 9 5 IP044A Diesel oil transfer pump 23.00 N YARD-757 3,4 YD-01 4 10 6 IPI 17B RWS pump B 10.01 Y IS-767 3,4 IS-01 2,3,4 11 6 IPI 17A RWS pump A 10.01 Y IS-767 3,4 1S-02 2,3,4 12 6 1P099A ESW pump A 54.00 Y PH-761 3,4 PH-02 2,3,4 13 6 1P229B RHR pump B 49.00 Y RB-NWCR 3,4 RB-05 2,3,4 14 6 1P21IA CS pump A 51.00 Y RB-SECR 3A4 RB-07 2,3A4 15 6 1P229C RHR pump C 49.00 Y RB-SECR 3,4 RB-07 2,3,4 16 6 IP1I17C RWS pump C 10.01 Y IS-767 3,4 IS-02 2,3,4 17 6 IP117D RWS pump D 10.01 Y IS-767 3,4 IS-01 2,3,4 18 7 CV3704 RS/DW floor drain sump inb-isolation 20.04 N BAY-8 5 RB-02 4 19 7 CV3705 RS/DW floor drain sump out-isolation 20.04 N BAY-8 5 RB-02 4 Y.
20 7 CV4357 Tonis hard pipe vent line isolation 73.01 N RB-NECR 5 RB-04 P1524 4 21 7 CV2234 HPCI cond ppg discharge to CRW isol 52.00 N RB-HPCI 3,5 RB-08 4 22 7 CVI804A CRD/ A recirc pumnp mini purge supply 64.01 N RB-757 5 RB-13 4 23 7 CV1804B CRD/ B recirc pump mini purge supply 64.01 N RB-757 5 RB-13 4 24 7 CV4910B RWS/Loop B dilution isolation valve 10.01 N PH-727 3,4 PH-03 4 25 7 CV4909 RWS/River water radwaste dilution isolation 10.01 N PH-727 3,4 PH-03 4 26 7 CV4415 MS/Main steam isolation valve (MSIV) 83.01 N DW-757 5 DW-01 4 27 7 CV2081 ESW loop B diesel cooler isolation 54.00 N TB-757 3,4 TB-01 4 28 7 CV2080 ESW loop A diesel cooler isolation 54.00 N TB-757 3,4 TB-02 4 29 8 MO1903 RHR B drywell spray out-isolation 49.00 N BAY-14 5 RB-03 4 30 8 M01932 RHR/LOOP B Torus spray outboard isolation 49.00 N BAY-14 5 RB-03 4 31 8 M01934 RHR/LOOP B Torus return isolation 49.00 N BAY-13 4,5 RB-03 4
ATTACHMENT A Seismic Walkdown Equipment List (SWEL) 5 Safety Enhanced Item Equip Equipment SUS Anc. Equipment Function For Area Major No. Class ID Equipment Description No. Y/N Location Note 4 IPEEE Walkby No. Mod? Notes Y,
32 8 SV4357 CV4357 control air supply isolation 73.01 N RB-NECR 5 RB-04 P1524 4 33 8 M01920 RHR pump D isolation valve 49.00 N RB-NWCR 3,4 RB-05 4 34 8 M01940 RHR/LOOP B Hx bypass valve 49.00 N RB-NWCR 3,4 RB-06 4 35 8 M02404 RCIC Turbine steam supply isolation 50.00 N RB-RCIC 3 RB-09 4 RB-RiR 36 8 M02003 RHR/LOOP A LPCI inboard inject 49.00 N VR 3,4,5 RB-10 4 RB-RHR 37 8 M02004 RHR Loop A LPCI Inject valve 49.00 N VR 3,4 RB-10 4 RB-RHR 38 8 M01904 RHR B LPCI out-inject valve 49.00 N VR 3,4 RB-10 4 39 8 M01908 RHR shutdown cooling suction isolation 49.00 N DW-775 3,4,5 DW-02 4 RB-RHR 40 8 MO1909 RHR shutdown cooling out-suction isolation 49.00 N VR 4,5 RB-10 4 41 8 M02000 RHR A inb-drywell spray valve 49.00 N RB-786 5 RB-15 4 42 9 1VEF030A Bat. Room exhaust fan 30.00 Y CB-800 1,2,3,4,5 Y CB-07 2,3,4 43 9 1VEF030B Bat. Room exhaust fan 30.00 Y CB-800 1,2,3,4,5 Y CB-07 2,3,4 44 10 1VAC030A CRHVAC, AC unit 30.00 Y CB-800 1,2,3,4,5 Y CB-07 2,3,4 45 10 I VAC030B CRHVAC, AC unit 30.00 Y CB-800 1,2,3,4,5 Y CB-07 2,3,4 46 10 IVACOII HVAC/RHR & CS ROOM AC Unit A 34.00 y RB-NWCR 3,4 RB-06 2,4 47 10 IVAC015A RCIC/LOOP A RCIC Room Cooling Unit 34.00 y RB-RCIC 3 RB-09 2,4 48 10 IVAC015B RCIC/LOOP B RCIC Room Cooling Unit 34.00 y RB-RCIC 3 RB-09 2,4 49 11 IVCHOOIA Control building chiller A 30.01 Y RB-812 3,4 RB-17 2,4 50 12 1K004 HVAC Instrument air compressor B 30.04 Y RB-786 5 RB-16 2,3,4 51 14 1DIO 125 VDC Div I Dist panel 2.00 Y CB-757 1,2,3,4,5 CB-01 2,4 52 14 1DI 1 125VDC div I distribution panel A 2.00 Y CB-757 1,2,3,4,5 CB-01 2,4 53 14 IDI3 125VDC div 1 distribution panel C 2.00 Y CB-757 1,2,3,4,5 CB-01 2,4 54 14 1D40 25OVDC distribution panel 88.00 Y CB-757 3 CB-02 2,4 55 15 1D2 125VDC Div 2 Battery 2.00 Y CB-757 1,2,3,4,5 CB-03 2,4 56 15 1D4 250VDC Battery 88.00 Y CB-757 3 CB-04 2,3,4 57 15 IDI 125VDC Div I Battery 2.00 Y CB-757 1,2,3,4,5 CB-05 2,3,4 Y8, 58 16 ID12 125 VDC div cDI I battery charger 2.00 Y CB-757 1,2,3,4,5 CB-01 P1900 2,3,4,5 59 16 ID120 125VDC back-up charger 2.00 Y CB-757 _ 1,2,3,4,5 CB-01I T P19ý00-- 2,3,4,5
ATTACHMENT A Seismic Walkdown Equipment List (SWEL) 5 Safety Enhanced Item Equip Equipment SUS Anc. Equipment Function For Area Major No. Class ID Equipment Description No. Y/N Location Note 4 IPEEE Walkbv No. Mod? Notes Y,
60 16 1D43 250 VDC battery 1D4 charger 88.00 Y CB-757 3 CB-01 P1900 2,3,4,5 61 16 ID25 120VAC instrument AC power supply 17.00 Y CB-757 1,2,3,4.5 CB-02 2,4 Y,
62 17 IG021/ENG SBDG 24.01 Y TB-757 1,2.3,4,5 TB-01 P1748 2,4,5 Y,
63 17 IG031/ENG SBDG 24.01 Y TB-757 1,2,3,4,5 TB-02 P1748 2,4,5 64 18 IC129B RHR loop B instrument rack 49.00 Y RB-NWCR 3,4,5 RB-05 2,3,4 65 18 IC129A R-R loop A instrument rack 49.00 Y RB-SECR 3,4,5 RB-07 2,3,4 66 18 1C120 HPCI instrument rack 52.00 Y RB-HPCI 3 RB-08 2,3,4 67 18 1C126A Main steam instrument rack 83.01 Y RB-757 1,3 RB-12 2.3,4 68 18 IC126B Main steam instrument rack 83.01 Y RB-757 1,3 RB-13 2,4 69 18 PT4599A SRV/RCS PT 80.00 Y RB-786 2 RB-14 2A4 70 19 TE4325 Torus water temp 59.00 N BAY-4 1,2,3,4.5 RB-01 4 71 19 TE4324 Torus water temp 59.00 N BAY- 15 1,2.3,4.5 RB-03 4 72 20 IC008 Aux power panel 99.28 Y CB-786 1,2.3,4,5 CB-06 2,4 73 20 1C013 TIP control board 78.02 Y CB-786 I Y CB-06 2,3,4 74 20 1C024 Vertical board 70.00 Y CB-786 5 Y CB-06 2,3,4 75 20 IC026 HVAC TB & CB Cont panel 30.00 Y CB-786 3.4.5 Y CB-06 2,4 76 20 1C031 Turbine generator relay panel 99.30 Y CB-786 1,2,3,4,5 CB-06 2,4 77 20 1C033 RHR Div 11,CS panel 49.00 Y CB-786 3,4 CB-06 2,3,4 78 20 1C043 CS Div I Core Spray vertical board 51.00 Y CB-786 3 Y CB-06 2,3,4 79 20 IC152 SBDG vent control cabinet 24.01 Y TB-757 1,2,3,4,5 TB-01 2,4 80 20 1C092 SBDG Gauge board 24.01 Y TB-757 1,2,3,4,5 TB-01 2,3,4 81 20 IC094 SBDG IG-21 control panel 24.01 Y TB-757 1,2,3,4,5 Y TB-01 ld,2,4 82 20 1C093 480VAC SBDG Control panel 24.01 Y TB-757 1.2,3,4,5 TB-02 2,3,4 RB-CRD 83 21 IR002A MSIV Accumulator 83.01 Y RR 5 RB-11 2,3,4 84 21 IVHX031B Non-essential cooling HX 30.00 Y RB-812 1,2,3,4,5 RB-17 2,4 85 21 IT113B Jacket water expansion tank 24.01 Y TB-757 1,2,3,4,5 TB-01 2.3,4 86 21 IT115B Diesel air receiver tank 24.01 Y TB-757 1,2,3,4,5 TB-01 2,3,4 87 21 ITt168 Diesel air receiver 24.01 Y 1B-757 1,2,3,4,5 TB-01 2,3,4 88 21 IT113A Jacket water expansion tank 24.01 Y TB-757 1,2,3,4,5 TB-02 2,4 89 21 IT115A Diesel air receiver tank 24.01 Y TB-757 1,2,3,4,5 TB-02 2,4
ATTACHMENT A Seismic Walkdown Equipment List (SWEL) 5 Safety Enhanced Item Equip Equipment SUS Anc. Equipment Function For Area Major No. Class ID Equipment Description No. Y/N Location Note 4 IPEEE Walkby No. Mod? Notes 90 21 ITI 16A Diesel air receiver 24.01 Y TB-757 1,2,3,4,5 TB-02 2,4 91 21 ITI 17A Diesel air receiver 24.01 Y TB-757 1,2,3,4,5 TB-02 2,4 92 21 IT037B 1000 gal diesel oil day tank 23.00 Y TB-757 1,2,3,4,5 TB-03 2,4 93 21 1T105A CAV/CV4304 Control Air Supply Accumulator 73.04 Y RB-NECR 5 RB-04 2,3,4 94 21 IT037A 1000 gal diesel oil day tank 23.00 Y TB-757 1,2,3,4,5 TB-04 2,4 R1B-CRD 95 21 IR002C MSIV Accumulator 83.01 Y RR 5 RB-Il 2,3,4 96 21 ITI05B CAV/CV4305 Control Air Supply Accumulator 73.04 Y RB-NECR 5 RB-04 2,3,4 97 0 PSE4357 Torus hard pipe vent line rupture disc 73.01 N RB-NECR 5 RB-04 P1524 4 Table Notes:
- 1. Component is inaccessible during normal plant operations or RF023. To be inspected later when accessible.
a) ID41 is a substitute for 1D42.
b) Inspection of 1A3 does not include inaccessible areas while energized. Other inspections performed are judged to be sufficiently representative to meet the intent of the walkdown guidance.
c) I X91 is a substitude for IX3 I d) Two bays of panel 1C094 that contain high voltage equipment items could not be opened for anchorage inspection, Next scheduled LCO for this panel is first quarter of 2014.
e) Additional inspection of internal components is required due to operational restraint. Additional inspection is deferred to a later date when the component is tagged-out.
f) Inspection of all internal compartments does not include inaccessible areas while energized due to operational and safety restraints. Other inspections performed are judged to be sufficiently representative to meet the intent of the walkdown guidance.
- 2. Component has anchorage. 69 items have anchorage, performed detailed inspection on 36 items with anchorage
- 3. Detailed anchorage inspection to be performed.
- 4. Five safety function designations are:
- 1. Reactor reactivity control
- 2. Reactor coolant pressure control
- 3. Reactor coolant inventory control
- 5. Containment function
- 5. P number is the design package that modified the system, structure, or component.
Attachment 3 to NG-13-0368 Revised Table E-1 "Summary of Inaccessible Equipment" 1 page follows
EPlan for Future Seismic Walkdown of Inaccessible Equipment As identified in the SWEL for DAEC in Appendix C, six (6) items have been deferred until the next scheduled outage for each equipment item. Table E-1 summarizes the reasons each item was deferred. Action Requests (AR's) have been initiated to identify these deferred components and to provide a schedule for the future Seismic Walkdowns for these items.
Table 0-1. Summary of Inaccessible Equipment Component ID Description Reason for Inaccessibility 1B09 480VAC IS Load Center Equipment energized - equipment outage required. Current schedule for equipment outage is in fourth quarter of 2013.
1X091 480VAC Transformer Equipment energized - equipment outage required. Current schedule for equipment outage is in fourth quarter of 2013.
1C094 SBDG 1G-21 control panel Equipment energized - equipment outage required. Current schedule for equipment outage is in first quarter of 2014.
1B91 480VAC Intake MCC Equipment energized & needed for plant operation. Anchorage was verified but not all sections of MCC opened. Equipment outage required. Current schedule for equipment outage is in fourth quarter of 2013.
1D14 125VDC RCIC MCC Equipment energized & needed for plant operation - Anchorage was verified but not all sections of MCC opened. Equipment outage required. Current plan is to complete inspections by RF024 (Fourth quarter of 2014) 1D41 25OVDC MCC Equipment energized-equipment outage required. Current plan is to complete inspections by RF024 (Fourth quarter of 2014)
E-i