ML19281C241
| ML19281C241 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 10/08/2019 |
| From: | NRC |
| To: | NRC/NRO/DLSE/LB4 |
| References | |
| Download: ML19281C241 (13) | |
Text
1 Vogtle PEmails From:
Rankin, Jennivine Sent:
Tuesday, October 8, 2019 1:34 PM To:
Vogtle PEmails
Subject:
FW: REV 1 - Presentation Material for LAR-19-XXX_WEC LAR 228 PCS Wetted Perimeter Changes Attachments:
LAR-19-Wetted Perimeter Test PSM - Public Version Rev 1.pdf For the October 10, 2019 pre-submittal public meeting.
From: Kellenberger, Nicholas <X2NRKELL@SOUTHERNCO.COM>
Sent: Tuesday, October 08, 2019 12:29 PM To: Patel, Chandu <Chandu.Patel@nrc.gov>; Habib, Donald <Donald.Habib@nrc.gov>
Cc: Arafeh, Yasmeen N. <YNARAFEH@southernco.com>; Unikewicz, Steven M. <SMUNIKEW@SOUTHERNCO.COM>
Subject:
[External_Sender] REV 1 - Presentation Material for LAR-19-XXX_WEC LAR 228 PCS Wetted Perimeter Changes Chandu/Don, Sorry for any confusion this update creates, but weve decided to add one slide (see page 7) with a diagram of the different elevations described in the LAR. We figured the old adage a picture is worth a thousand words still holds true.
Please use this updated material during the public call Thursday.
- Thanks, Nick Kellenberger Vogtle 3 and 4 Site Licensing phone: (706) 437-2333 mobile: (803) 391-9671 From: Kellenberger, Nicholas Sent: Tuesday, October 8, 2019 9:47 AM To: Patel, Chandu <Chandu.Patel@nrc.gov>; Habib, Donald <Donald.Habib@nrc.gov>
Cc: Arafeh, Yasmeen N. <YNARAFEH@southernco.com>; Steven M. Unikewicz (SMUNIKEW@SOUTHERNCO.COM)
<SMUNIKEW@SOUTHERNCO.COM>
Subject:
Presentation Material for LAR-19-XXX_WEC LAR 228 PCS Wetted Perimeter Changes Chandu and Don, Attached are the materials for the public call on Thursday for PCS Wetted Perimeter Changes. The draft LAR was previously provided.
- Thanks, Nick Kellenberger Vogtle 3 and 4 Site Licensing phone: (706) 437-2333 mobile: (803) 391-9671
Hearing Identifier:
Vogtle_COL_Docs_Public Email Number:
488 Mail Envelope Properties (BN6PR09MB1298B5AC32AAE440F390A135989A0)
Subject:
FW: REV 1 - Presentation Material for LAR-19-XXX_WEC LAR 228 PCS Wetted Perimeter Changes Sent Date:
10/8/2019 1:34:22 PM Received Date:
10/8/2019 1:34:26 PM From:
Rankin, Jennivine Created By:
Jennivine.Rankin@nrc.gov Recipients:
"Vogtle PEmails" <Vogtle.PEmails@nrc.gov>
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BN6PR09MB1298.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 1913 10/8/2019 1:34:26 PM LAR-19-Wetted Perimeter Test PSM - Public Version Rev 1.pdf 130751 Options Priority:
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LAR Pre-Submittal Meeting:
PCS Wetted Perimeter Test Modification October 10, 2019
LAR Pre-Submittal Meeting Agenda
- Background Information
- Draft LAR
- Proposed Licensing Bases Changes
- Summary 2
Background Information
- The VEGP Units 3&4 Combined Licenses (COLs), Appendix C, currently requires the PCS wetted perimeter test to be performed directly at the spring line (approximate elevation of 244 ft.).
- The draft LAR proposes changes to the Vogtle Units 3&4 licensing bases to allow the Containment Vessel (CV) wetted perimeter test measurement to be taken at any elevation between the 266 ft. elevation and the spring line.
3
Draft LAR Initial Test Program (ITP) (continued)
Testing includes a containment water coverage test. The containment coverage is measured at the base of the upper annulus in addition to measuring coverage at the spring line for the full flow case and a lower flow case using the PCCWST to deliver cooling water to the containment shell.
- UFSAR Subsection 14.2.9.1.4 describes how the flow testing is to be performed. This includes item d) [] Water delivery and coverage is verified at the initial minimum water level and as each of the first two standpipes is uncovered. Water coverage is measured at the spring line and the base of the upper annulus as described in Subsection 6.2.2.4.2.
4
Draft LAR Initial Test Program (ITP) (continued)
- The air baffle panels, located above the spring line cause construction and testing difficulties. The air baffle panels are attached to the containment vessel starting at approximately elevation 255.
- If the water coverage measurement location is adjusted to above the spring line, the air baffle installation and subsequent PCS wetted coverage test can be decoupled and neither will be impacted by the other activity.
- The WGOTHIC evaluation model wetted coverage assumptions more closely align with a coverage measurement location between elevation 266 ft. and the spring line.
- The model is not limited to strictly measuring the wetted coverage at the spring line.
5
Draft LAR 6
Initial Test Program (ITP) (continued)
- It is functionally equivalent to measure the wetted perimeter at any of the following elevations:
- 244 ft. (approximate elevation of the spring line),
- 255 ft. (approximate elevation of the top of the air baffle seal plate), or
- 266 ft. (proposed upper elevation)
- The exact elevation is not relevant as long as it is below the second weir (approximate elevation 269 ft.)
- The proposed range of elevations is consistent with the conservative assumption of a maximum 90% wetted coverage in the AP1000 WGOTHIC containment evaluation model.
Containment Elevations 7
Draft LAR Initial Test Program (ITP) (continued)
- The change to allow a range of elevations as the measurement location for the test does not change the requirement to perform the test as described in Tier 1 or the UFSAR.
- The change does not change the performance requirements of the test.
8
Proposed Licensing Bases Changes COL Appendix C ITAAC
- ITAAC 2.2.02.07b.i, which requires the PCS flow test be performed and the containment shell coverage to be measured at the spring line, is proposed to be changed to allow the containment shell coverage to be measured at any elevation between 266 ft. and the spring line.
UFSAR Tier 2
- UFSAR Subsection Table 3.9-17, Note 1, is proposed to be revised to recognize that air baffle panels may be needed to be removed at the containment vessel spring line to permit visual inspection of the water coverage and the vessel coating. If needed, the panels to be removed shall be approximately 90 degrees apart.
- UFSAR Subsection 6.2.2.4.2 is proposed to be revised to reflect that the containment coverage will be measured at the base of the upper annulus in addition to the coverage at any elevation between elevation 266 ft. and the spring line.
9
Proposed Licensing Bases Changes UFSAR Tier 2 (continued)
- UFSAR Table 6.2.2-1, Note 3 is proposed to be revised to reflect that the wetted coverage will be measured as the linear percentage of the containment shell circumference wetted measured at any elevation between elevation 266 ft. and the upper spring line for the safety analysis flow rate conditions.
- UFSAR Subsection 14.2.9.1.4 is proposed to be revised to reflect that the water coverage will be measured at any elevation between elevation 266 ft. and the spring line and the base of the upper annulus as described in Subsection 6.2.2.4.2.
10
Summary SNC proposes to revise the PCS Wetted Perimeter Test to allow the test measurement to be performed at any elevation between 266 ft. and the spring line.
- It is functionally equivalent to measure the wetted perimeter at any of the following elevations:
- 244 ft. (approximate elevation of the spring line),
- 255 ft. (approximate elevation of the top of the air baffle seal plate), or
- 266 ft. (proposed upper elevation)
- The exact elevation is not relevant as long as it is below the second weir (approximate elevation 269 ft.)
- The proposed range of elevations is consistent with the conservative assumption of a maximum 90% wetted coverage in the AP1000 WGOTHIC containment evaluation model.
11