ML18191B212

COL Docs - Discussion of Functional for ITAAC 2.3.04.02.ii (Index No. 328)

ML18191B212
Person / Time
Site:	Vogtle
Issue date:	07/09/2018
From:	NRC
To:	NRC/NRO/DLSE/LB4
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Download: ML18191B212 (4)

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Vogtle PEmails From: Hoellman, Jordan Sent: Monday, July 9, 2018 2:38 PM To: Vogtle PEmails

Subject:

Discussion of "Functional" for ITAAC 2.3.04.02.ii [Index No. 328]

Attachments: ITAAC 328 functional discussion for public call.pdf Please see the attached discussion for the definition of functional as it relates to ITAAC 2.3.04.02.ii [Index No. 328] for discussion at the public meeting on July 12, 2018.

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Hearing Identifier: Vogtle_COL_Docs_Public Email Number: 316 Mail Envelope Properties (SN6PR09MB26085018A9B0AA5412435447D5440)

Subject:

Discussion of "Functional" for ITAAC 2.3.04.02.ii [Index No. 328]

Sent Date: 7/9/2018 2:38:25 PM Received Date: 7/9/2018 2:38:28 PM From: Hoellman, Jordan Created By: Jordan.Hoellman2@nrc.gov Recipients:

"Vogtle PEmails" <Vogtle.PEmails@nrc.gov>

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SNC DISCUSSION OF FUNCTIONAL FOR ITAAC 2.3.04.02.ii [INDEX NUMBER 328]

ITAAC 2.3.04.02.ii [328] FPS As-built Pipe Stress Report is very similar to other ITAAC involving ASME piping design reports which are supported by stress analyses performed to the rules of ASME Section III.

One difference that does exist is the use of the term functional in the AC for ITAAC 328 as compared to functional capability for other piping design ITAAC.

In reference to ITAAC 328; SNC defines functional as:

Functional in this context refers to the capability of the piping to withstand the combined normal and seismic design basis loads without a loss of ability to provide water for firefighting capability.

The basis for this definition is:

1. ITAAC 328 pertains to Fire Protection piping shown on COL Appendix C Figure 2.3.4-2 (the figure) which is required to remain functional following a safe shutdown earthquake (SSE).

2. UFSAR Subsection 9.5.1.1.1 defines the requirement for fire protection (piping) shown on the figure and states: Following a SSE, provide water to hose stations for manual firefighting in areas containing safe shutdown equipment.

3. The piping shown on the figure, designated as ASME Class B (JCB) and F (RCF), is designed to provide the functional requirement to provide water for manual firefighting called out in UFSAR Subsection 9.5.1.1.1 and is analyzed to survive normal operating (service) loads and seismic (SSE) loads.

4. Piping that was chosen to survive the normal operating loads and SSE loads that the analyzed design calls for are derived from the piping design specification APP-GW-P1-001.

5. Piping design specification APP-GW-P1-001 stipulates that the piping (both Class B and F) shown on the figure will remain functional following a SSE. The primary difference in the pipe design (stress analysis) for these two classes of pipe is that the stress allowable limit for Class F is higher than Class B but both classes of pipe are designed to not break and continue to provide water for manual firefighting following a SSE.

AP1000 FPS Piping Class Pipe Design Stress Limits RCF equal to the smaller of 4.5 Sh and 3.0 Sy Note 1 JCB equal to the smaller of 3.0 Sh and 2.0 Sy Note 2 Note 1: Reference piping design specification APP-GW-P1-001 and stress analysis APP-FPS-PLR-511. This stress limit is applied to those portions of piping systems required to remain functional meaning to withstand combined normal and seismic design basis loads without a loss of its ability to provide water for firefighting capability.

Note 2: Reference piping design specification APP- APP-GW-P1-001 and stress analysis APP-FPS-PLR-100. This stress limit is applied to those portions of piping systems required to maintain functional capability (i.e., piping is designed to withstand the effects of earthquakes without a loss of its ability to convey fluids from one location to another).

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Where Sh is Code Allowable Stress and Sy is Yield Strength. These equations and allowable load combinations are covered in UFSAR Table 3.9-8.

6. The as-built FPS piping will be analyzed to at least the rules of the ASME Section III, Class 3 (i.e.,

satisfying associated stress equations and allowable stresses).

ITAAC 328 will demonstrate ITAACs acceptance by requiring as-built piping to be reconciled with the as-designed stress analyses to demonstrate it remains functional following a SSE.

References:

1. APP-GW-P1-001, Piping Design Criteria for AP1000 - The scope of these criteria covers the loadings, methods of analysis and acceptance criteria for Seismic Category I ASME III, Seismic Category II and Non-seismic ASME B31.1 Code piping.

2. APP-FPS-PLR-511, Piping Analysis Report for Fire Protection System (FPS) APP-FPS-PLR-5Zone 1, Containment Building Room 11400. The scope of this analysis covers the FPS piping classified as RCF.

3. APP-FPS-PLR-100, Piping Analysis for Passive Containment Cooling System Piping in Room 12306 Aux. Bldg. The scope of this analysis covers the CNS FPS penetration.

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