ML12320A305

Licensee Slides for November 15, 2012 Public Meeting to Discuss License Amendment to Use Reg Guide 1.6 Revision 1

ML12320A305
Person / Time
Site:	Callaway
Issue date:	11/15/2012
From:	Union Electric Co, Ameren Corp
To:	Plant Licensing Branch IV
Lyon C
References
RG-1.061, Rev 1, TAC ME9839
Download: ML12320A305 (21)

Text

License Amendment Request To use Reg. Guide 1.61 Rev. 1

Meeting Agenda

• Introductions Fred Lyon/Tom Elwood

• Meeting Purpose Tom Elwood

• Plant Modification Description Walt Muskopf

• Use of Reg. Guide 1.61 Rev. 1 Walt Muskopf

• Results & Conclusion Walt Muskopf

• Summary Tom Elwood

• Schedule S h d l T Tom El Elwood d

• Open Discussion All 2

Introductions

Introduction of Meeting g Attendees

• Ameren Missouri (Union Electric Co.)

• Tom Elwood (Supervising Engineer Engineer, Regulatory Affairs)

• Walt Muskopf (Project Manager - Major Projects)

• Ameren Missouri Consultant

• Dave Shafer (Licensing Consultant)

• AREVA, NP

• Alan Stalker (Project Manager, Major Projects & Upgrades)

• Frank F k Gregory G (Structural (St t l Supervisory S i Engineer)

E i ) - by b phone h

• David Maxham (Technical Consultant) - by phone

• ADVENT Engineering

• Jeff J ff Sh Shulman l (Project (P j t Engineer)

E i ) (by (b phone) h )

• Burns & McDonnell

• Mike Henry (Project Manager) 3

Meeting Purpose

• Inform NRC of forthcoming LAR to be submitted in December 2012

• LAR will request prior NRC approval to use the methodology in Reg. Guide 1.61 Rev. 1 in lieu of Reg. Guide 1.61 Rev. 0 for analysis y of new Integrated g Head Assembly y ((IHA),

), similar to Diablo Canyon

• Damping values determined using weighted average methodology in Reg. Guide 1.61 Rev. 1 will be used for the response spectrum analysis of the IHA only only.

• Includes development of reaction loads from the IHA on the Replacement Reactor Vessel Closure Head (RRVCH) and on the containment cavity wall embedments.

embedments

• Also includes use of Reg. Guide 1.61 Rev. 1 to determine damping values for OBE & LOCA 4

Plant Modification Description Current Reactor Vessel Closure Head (RVCH) ( )

Current RVCH Assembled Current RVCH Cable Hookups 5

Plant Modification Discussion Current Reactor Vessel Closure Head (RVCH) ( )

Current RVCH in Cavity Current RVCH on Stand 6

Plant Modification Description New Replacement Reactor Vessel Closure Head (RRVCH) with Integrated Head Assembly (IHA) 7

Plant Modification Discussion Major j Features of the Integrated g Head Assembly y ((IHA))

I t Integrated t d Lift Rig Ri CRDM Fans Integrated Missile Shield Quick Detach Seismic Supports Head Vent Valves Relocated Folding Cable Supports Integrated Ductwork Integrated Shielding 8

8

Plant Modification Description Comparison of Original and Replacement CRDM Seismic Supports Current CRDM Seismic Platform IHA CRDM Seismic Ring g

9

Plant Modification Description Integrated g Head Assemblyy (IHA) ( )

• IHA is a new steel structure

• Damping values from Reg. Guide 1.61 Rev. 1 will be used for the response spectrum analysis of the IHA only.

• IHA is predominantly a bolted steel structure, therefore application of Reg.

Reg Guide 1.61 1 61 Rev.

Rev 1 provides a more realistic representation of this steel structure.

• Application of Reg. Guide 1.61 Rev. 1 prevents an overly conservative design of the IHA and the need to redesign the existing i ti containment t i t cavity it wallll seismic i i anchorh embedments.

• Reg. Guide 1.61 Rev. 1 will also be used to develop the reaction loads from the IHA on the Replacement Reactor Vessel Closure Head (RRVCH) and on the containment cavity wall embedments.

10

Use of Reg. Guide 1.61 Rev. 1 Current Licensing g Basis ((FSAR Table 3.7(N)-1) ( ) )

• Reg.

Reg Guide 1 1.61 61 Rev Rev. 0 Reg. Guide 1.61 Rev. 0 Damping Values Structure St t or Operating O ti Basis B i Safe S f Shutdown Sh td Component Earthquake (OBE) Earthquake (SSE)

Welded 2% 4%

Connections Bolted 4% 7%

Connections 11

Use of Reg. Guide 1.61 Rev. 1 Proposed p Change g to Licensing g Basis

• Reg. Guide 1.61 Rev. 1 Reg. Guide 1.61 Rev. 1, Table 1, Damping Values Structure or Component Safe Shutdown Earthquake (SSE)

Welded 4%

Connections Bolted-Bearing 7%

Connections Note: For steel structures with a combination of different connection types, use the lowest specified damping value, or as an alternative, lt ti use a weighted i ht d average damping d i value l based b d on the number of each type present in the structure.

12

Use of Reg. Guide 1.61 Rev. 1 Proposed p Change g to Licensing g Basis ((cont.))

• Reg. Guide 1.61 Rev. 1 Reg. Guide 1.61 Rev. 1, Table 2 Damping Values Structure or p g Basis Earthquake Operating q ((OBE))

Component Welded 3%

Connections Bolted-Bearing 5%

Connections

• Note from Table 1 will also be applied to OBE &

LOCA 13

Use of Reg. Guide 1.61 Rev. 1 Requested q Approval pp of Methodology gy Changes g 10 CFR 50.59(c)(2)(viii) requires NRC approval of licensee-proposed changes that result in a departure from a method of evaluation described in the FSAR used in establishing the design bases or in the safety analyses.

• For the Callaway IHA seismic analysis, the methodology of Reg. Guide 1.61 Rev. 1 is being used, as modified by applying the footnote of Table 1 for the SSE to Table 2 for the OBE as well (where the footnote does not appear).

• P NEI 96 Per 96-07, 07 a proposed d change h constitutes tit t a departure d t ffrom a method th d off evaluation if it:

• changes any element of the analysis methodology described in the FSAR unless the results are conservative or essentially the same, or

• uses new or different methods of evaluation that are not approved by the NRC for the intended application.

Although Reg. Guide 1.61 Rev. 1 is an NRC-approved Reg. Guide, and although Diablo Canyons license amendment and accompanying SER dated September 29, 2010 provides precedence for use of Reg. Guide 1.61 Rev. 1, due to differences between Diablo Canyons IHA design and licensing basis in comparison to Callaways Callaway s, and in light of the above-described modified use of Reg. Guide 1.61 Rev. 1, Ameren Missouri has conservatively determined that its proposed use of Reg. Guide 1.61 Rev. 1, as modified, is a departure from a method of evaluation and thus requires prior NRC approval.

14

Use of Reg. Guide 1.61 Rev. 1 Weighted Average Damping Values for IHA Response Spectrum Analysis Total of 315 connections in the IHA which transfer a significant level of inertia load load.

• 48 Welded Connections

• 267 Bearing - Bolted / Pinned Connections

• 84.8% bearing - bolted connections

• No friction - bolted connections

• Based upon p the footnote to Reg.

g Guide 1.61 Rev. 1, Table 1 and the quantities above, the weighted average is calculated below For OBE:

(3% x 48 + 5% x 267) / (48+267)

(48 267) = 4.70%

For SSE:

(4% x 48 + 7% x 267) / (48+267) = 6.54%

15

Use of Reg. Guide 1.61 Rev. 1 Actual Damping p g Values Used in Analyses y Table 1: IHA Seismic and LOCA Load Analysis Method Summary OBE SSE LOCA Horizontal Vertical Horizontal Vertical Horizontal Vertical Analysis USM1 USM1 USM1 USM1 Response Response Method Response Response Response Response Spectra3 Spectra3 Spectra2 Spectra2 Spectra2 Spectra2 D

Damping i 4 50%

4.50% 4 50%

4.50% 6 25%

6.25% 6 25%

6.25% 6 25%

6.25% 6 25%

6.25%

1. USM refers to the use of Uniform Support Motion (enveloped spectra) p ) as inputp to the response p spectra p analysis.

y

2. OBE and SSE enveloped response spectra inputs were applied where the IHA tie rods are attached to the containment cavity wall and where the IHA lift rods and the bottom ring beam are attached to the RRVCH.

3. LOCA response spectra inputs were applied where the IHA lift rods and the bottom ring beam are attached to the RRVCH.

16

Results & Conclusion Preliminary stress ratios for all safety-related safety related and non-safety-related linear components, plate components p p and connections are less than 1.0 and, therefore, meet the ASME Code.

17

Summary Ameren Missouri will be requesting prior NRC approval to use the methodology in Reg Reg. Guide 1.61 1 61 Rev.

Rev 1 in lieu of Reg Reg.

Guide 1.61 Rev. 0 for analysis of the new Integrated Head Assembly (IHA).

• Damping values determined using Reg. Guide 1.61 Rev.

1 will be used for the response spectrum analysis of the IHA only.

• Includes development of reaction loads from the IHA on the Replacement Reactor Vessel Closure Head (RRVCH) and on the containment cavity wall.

• Also includes use of Reg. Guide 1.61 Rev. 1 to determine damping values for OBE & LOCA 18

Schedule

• License Amendment Request will be submitted in December 2012.

• Design Change Package complete by October 2013

• Request R t NRC approvall off Li License Amendment Request by September 2013 19

Open Discussion License Amendment Request to use Reg Guide 1 Reg. 1.61 61 Rev Rev. 1 Questions?

20