ND-18-1330, Preliminary Amendment Request (Par): Column Line 1 Wall Reinforcement Area Change (PAR-18-026)
| ML18292A706 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 10/19/2018 |
| From: | Whitley B Southern Nuclear Operating Co |
| To: | Document Control Desk, Office of New Reactors |
| References | |
| ND-18-1330, PAR-18-026 | |
| Download: ML18292A706 (8) | |
Text
B. H. Whitley Southern Nuclear Director Operating Company, Inc.
Regulatory Affairs 3535 Colonnade Parkway Birmingham, AL 35243 Tel 205.992.7079 October 19, 2018 Docket Nos.: 52-025 ND-18-1330 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Southern Nuclear Operating Company Vogtle Electric Generating Plant Unit 3 Preliminary Amendment Request (PAR):
Column Line 1 Wall Reinforcement Area Change (PAR-18-026)
Ladies and Gentlemen:
The U.S. Nuclear Regulatory Commission (NRC) issued the Vogtle Electric Generating Plant (VEGP) Unit 3 combined license (COL) (License No. NPF-91) to Southern Nuclear Operating Company (SNC) on February 10, 2012.
By SNC letter ND-18-1305, dated October 19, 2018, SNC submitted License Amendment Request (LAR), LAR-18-026 (ADAMS Accession Number ML18292A660), to revise information in the VEGP Unit 3 Updated Final Safety Analysis Report (UFSAR). The LAR proposes to change the vertical reinforcement information provided in the VEGP Unit 3 column line 1 wall from elevation 135'-3" to 137'-0".
SNC is submitting this Preliminary Amendment Request (PAR), PAR-18-026, to minimize construction delays for VEGP Unit 3 during the NRCs evaluation of the related LAR. The determination of whether the NRC has any objection to SNC proceeding with construction based on the proposed licensing basis changes identified in the LAR is requested on or before November 19, 2018. Delayed determination regarding this PAR could result in delay of the completion of the column line 1 wall for VEGP Unit 3.
A description of the proposed change and the reason for the change are contained in the Enclosure to this letter. This PAR has been developed in accordance with guidance provided in the most recent revision to the Interim Staff Guidance on Changes during Construction Under 10 CFR Part 52, COL-ISG-25 [ADAMS Accession Number ML15058A377] and corresponds accurately and technically with the above-mentioned LAR-18-026. The technical scope of this PAR is consistent with the subject LAR. Section 7 of the Enclosure further identifies and details the scope of the no objection finding sought in this PAR.
This letter does not contain any NRC commitments. This letter has been reviewed and confirmed to not contain security-related information.
U.S. Nuclear Regulatory Commission ND-18-1330 Page 2of4 Should you have any questions, please contact Ms. Paige Ridgway at (205) 992-7516.
I declare under penalty of perjury that the foregoing is true and correct. Executed on the 19th of October 2018.
Respectfully submitted, Brian H. Whitley Director, Regulatory Affairs Southern Nuclear Operating Company
Enclosure:
Vogtle Electric Generating Plant (VEGP) Unit 3 - Preliminary Amendment Request:
Column Line 1 Wall Reinforcement Area Change (PAR-18-026)
U.S. Nuclear Regulatory Commission ND-18-1330 Page 3 of 4 cc:
Southern Nuclear Operating Company / Georgia Power Company Mr. S. E. Kuczynski (w/o enclosure)
Mr. D. G. Bost (w/o enclosure)
Mr. M. D. Meier (w/o enclosure)
Mr. D. H. Jones (w/o enclosure)
Mr. J. B. Klecha Mr. G. Chick Mr. D. L. McKinney (w/o enclosure)
Mr. T. W. Yelverton (w/o enclosure)
Mr. B. H. Whitley Ms. C. A. Gayheart Mr. C. R. Pierce Ms. A. G. Aughtman Mr. D. L. Fulton Mr. M. J. Yox Mr. E. W. Rasmussen Mr. J. Tupik Mr. W. A. Sparkman Ms. A. C. Chamberlain Ms. A. L. Pugh Ms. P. Reister Ms. K. Roberts Document Services RTYPE: VND.LI.L00 File AR.01.02.06 Nuclear Regulatory Commission Mr. W. Jones (w/o enclosure)
Ms. J. Dixon-Herrity Mr. C. Patel Ms. J. M. Heisserer Mr. B. Kemker Mr. G. Khouri Ms. S. Temple Mr. F. Brown Mr. C. J. Even Mr. A. Lerch Mr. S. Walker State of Georgia Mr. R. Dunn Oglethorpe Power Corporation Mr. M. W. Price Ms. A. Whaley Municipal Electric Authority of Georgia Mr. J. E. Fuller Mr. S. M. Jackson
U.S. Nuclear Regulatory Commission ND-18-1330 Page 4 of 4 Dalton Utilities Mr. T. Bundros Westinghouse Electric Company, LLC Mr. L. Oriani (w/o enclosure)
Mr. C. Churchman (w/o enclosure)
Mr. M. Corletti Mr. M. L. Clyde Ms. L. Iller Mr. D. Hawkins Mr. J. Coward Other Mr. S. W. Kline, Bechtel Power Corporation Ms. L. A. Matis, Tetra Tech NUS, Inc.
Dr. W. R. Jacobs, Jr., Ph.D., GDS Associates, Inc.
Mr. S. Roetger, Georgia Public Service Commission Ms. S. W. Kernizan, Georgia Public Service Commission Mr. K. C. Greene, Troutman Sanders Mr. S. Blanton, Balch Bingham NDDocumentinBox@duke-energy.com, Duke Energy Mr. S. Franzone, Florida Power & Light
Southern Nuclear Operating Company ND-18-1330 Enclosure Vogtle Electric Generating Plant (VEGP) Unit 3 Preliminary Amendment Request:
Column Line 1 Wall Reinforcement Area Change (PAR-18-026)
(This Enclosure consists of 4 pages, including this cover page.)
ND-18-1330 Enclosure PAR-18-026: Column Line 1 Wall Reinforcement Area Change Page 2 of 4 Pursuant to 10 CFR 52.98(c) and in accordance with 10 CFR 50.90, Southern Nuclear Operating Company (SNC) submitted license amendment request (LAR)-18-026 to change the Vogtle Electric Generating Plant (VEGP) Unit 3 licensing basis documents associated with Combined License No. NPF-91.
Accordingly, SNC requests the determination of whether the NRC has any objection to SNC proceeding with construction of VEGP Unit 3 column line 1 wall, which is subject to the changes proposed in LAR-18-026. Delayed determination regarding this PAR will result in delay in the construction completion of VEGP Unit 3 Auxiliary Building, as identified in the Preliminary Amendment Request (PAR) provided below, to be provided by the date shown below.
PAR Request Number:
SNC PAR-18-026 Station Name:
VEGP Unit Number(s):
3 4
PAR Request Date:
October 19, 2018
- 1. NRC PAR Notification Requested Date (see Block 7 for basis): November 19, 2018
- 2. License Amendment Request References (as applicable):
LAR submittal date and SNC Correspondence Number: LAR-18-026 - October 19, 2018 / ND-18-0305 Expected LAR submittal date:
- 3. Brief Description of Proposed Change:
The proposed change would revise information in UFSAR (plant-specific DCD) Table 3H.5-3 and UFSAR Figure 3H.5-3, in regard to the vertical reinforcement provided in the Vogtle Unit 3 column line 1 wall (Wall 1). Per UFSAR Figure 3H.5-3, the design of the Wall 1 from elevation (EL.) 117'-6" to EL. 135'-3" requires outer layer reinforcing bar (rebar) curtains (north & south face) consisting of #11@6 vertical bars with #11@6" horizontal bars. A second layer of #8@12" vertical bars is required to begin development length below EL.
135'-3" and extending splice length above EL. 135'-3" on the south face only. At Vogtle Unit 3, there were no second layer #8@12" vertical bars installed in the south face for the entire length of Wall 1 around EL. 135'-3" prior to concrete placement of Wall 1 from EL. 117'-6" to EL. 135'-3".
The #8@12" vertical rebar will be installed with a mechanically headed reinforcement (T-head) beginning at EL 135'-3", providing full development of the bars at and above EL.137'-0", in accordance with ACI 349-01 and ACI 318-11. As a result of this change, through the development length of the rebar, the provided minimum amount of reinforcement area is 3.12 in2/ft and the required area of reinforcement is 2.81 in2/ft.
The #11@6" vertical and horizontal reinforcement on the north and south face remain unchanged. The configuration of the Vogtle Unit 4 Wall 1 remains unchanged.
These changes impact UFSAR Table 3H.5-3 and UFSAR Figure 3H.5-3.
ND-18-1330 Enclosure PAR-18-026: Column Line 1 Wall Reinforcement Area Change Page 3 of 4
- 4. Reason for License Amendment Request:
The design change specifies the installation of the #8@12" vertical reinforcement considering headed reinforcement and requires the #8@12" vertical reinforcement to be fully developed at EL. 137'-0" instead of EL. 135'-3". Since the #8@12" vertical bars are not fully developed below EL. 137'-0" as part of this change, the bars are not considered to be credited as a portion of the provided steel area below EL. 137'-0".
The development length (Ldt) of a #8 headed reinforcement in tension is Ldt=16", consistent with ACI 349-01 and ACI 318-11, Section 12.6. Given the existing construction joint at EL. 135'-3", the available height of wall to develop the bars prior to EL. 137'-0" is 21".
Therefore, the installation of these bars using a headed reinforcement ensures that the bars will be fully developed at EL. 137'-0" and above, consistent with provisions of ACI 318-11.
The design of Wall 1 above EL. 137'-0" remains unchanged, and the area between EL.
135'-3" and EL. 137'-0" was reevaluated and remains in compliance with the requirements of ACI 349-01 and ACI 318-11. The required reinforcement to satisfy ACI 349-01 and ACI 318-11 requirements is calculated using Finite Element Analysis (FEA) using the applicable load combinations and design criteria, in accordance with UFSAR Table 3.8.4-2 and ACI 349-01. The demand in the wall between EL. 135'-3" and EL. 137'-0" remains less than the capacity of the wall. The proposed change does not impact the seismic analysis of the nuclear island because it does not affect the mass or stiffness of the seismic model.
A conservative refinement of the reported FEA results was performed. For the impacted region of Wall 1 (EL. 135'-3" to EL. 137'-0"), the provided area of reinforcement considered is 3.12in2/ft (#11@6"). The evaluation determined a maximum required area of steel, along the entire evaluated length of wall between EL. 135'-3" and EL. 137'-0", of 2.801 in2/ft, for load combinations which do not consider simultaneous thermal and SSE loads, consistent with UFSAR Table 3H.5-3 reported values. The resulting interaction ratio of the conservative refinement for the impacted region is IR=0.898 (2.801 in2/ft / 3.12 in2/ft). For consistency with significant figures in UFSAR Table 3H.5-3, a required area value of 2.81 in2/ft is included in the proposed markups, which conservatively bounds the actual required area of 2.801 in2/ft.
Note that for load combinations which consider simultaneous thermal and SSE loads, the required area of steel is 3.085in2/ft, with a corresponding interaction ratio for the impacted region of IR=0.989 (3.085in2/ft / 3.12in2/ft). Since the interaction ratio is less than 1.0, this change is acceptable and continues to satisfy the acceptance criteria of ACI 349-01 and applicable design criteria.
Since conformance is maintained with the applicable codes and standards identified in the underlying UFSAR information and margin exists to justify the deviation, the change to the vertical reinforcement provided in the Vogtle Unit 3 Wall 1 from elevation 135'-0" to 137'-0" is found to be acceptable.
The proposed change requires a change to Tier 2* information in UFSAR Table 3H.5-3 and UFSAR Figure 3H.5-3. Therefore, the proposed change requires NRC approval in accordance with 10 CFR 52.98(c).
Additional details are provided in the referenced LAR (LAR-18-026).
ND-18-1330 Enclosure PAR-18-026: Column Line 1 Wall Reinforcement Area Change Page 4 of 4
- 5. Is Exemption Request Required?
Yes No If Yes, Briefly Describe the Reason for the Exemption.
No exemption required.
- 6. Identify Applicable Precedents:
No precedent identified.
- 7. Impact of Change on Installation and Testing Schedules:
A delayed determination regarding this PAR will result in delay of the installation of rebar and concrete pours for the Vogtle Unit 3 column line 1 wall, as described below.
As such, this PAR requests a no objection finding related to the changes described in LAR-18-026 by the date identified in Block 1 above (or sooner if reasonably achievable) to allow for appropriate notifications and release of further activities dependent on construction of the Vogtle Unit 3 column line 1 wall, as noted below.
Specifically, SNC is requesting a no objection finding to allow:
Installation of rebar and concrete pour for the Column Line 1 wall from 135'-3" to 163'-0" Installation of rebar and concrete pour for the Column Line 1 wall from 163'-0" to 180'-0" Construction holds have been issued for these activities.
A no objection finding for the above activities would allow for VEGP Unit 3 construction activities to proceed.
- 8. Impact of Change on ITAAC:
No ITAAC are affected by this change, but it will impact the closure of the ITAAC. Final approval of the License Amendment Request will be necessary for closure of the related ITAAC, but a no objection finding is requested for this PAR in order to proceed with construction pursuant to the process outlined in COL Condition 2.D(1), Changes during Construction. This PAR should be considered for any inspections related to ITAAC 3.3.00.02.a.i.d (item No. 763) of the VEGP Unit 3 COL Appendix C Table 3.3-6.
- 9. Additional Information:
None