ML24332A049

Enclosure - Request for Additional Information Clarification Questions

ML24332A049
Person / Time
Site:	07201042
Issue date:	11/27/2024
From:	Storage and Transportation Licensing Branch
To:
Shared Package
ML24332A047	List: ML24332A048 ML24332A049
References
EPID L-2022-LLA-0017, CAC 001028
Download: ML24332A049 (3)

Text

Enclosure Materials RAI clarifications RAI 8-3. Provide the following information for the UFSAR Tables on the material properties:

(1) Correct the material density in the UFSAR Tables:

8-37. ASTM A-572 Grade 60 8-38. ASTM A29 Grade 1010 through 1020 8-39. ASTM A706 Grade 60 8-40. ASTM A449 Type 1, <1 in. dia.

8-41. ASTM A449 Type 1, diameters > 1.0 in. to 1 1/2 in 8-42. Material Properties, ASTM A-572 Gr. 50 8-43. Material Properties, SA-572 Gr. 65 - Applicable to EOS-HSM-SC Only These tables list density units of lb/ft3 but the density values listed appears to be in lb/in3. For reference 0.28 lb/in3 = 484 lb/ft3.

TNs response: Units for density will be corrected to lb/in3 (2) Provide the material specification, elastic modulus, yield strength, tensile strength, and source for the tensile and yield values in UFSAR Table 8-38. This table identifies the material as ASTM A29 Grade 1010 through 1020. The staff notes that ASTM A29, Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought, calls out a number of ASTM specifications. ASTM A29 is included in ASME Section II Part A but the mechanical properties are not listed in ASME Section II Part D Table U and Table Y-

1. ASTM grades identified in ASTM A29 that are incorporated into ASME Section II that are included in Part D Table U and Table Y-1 do not match the material grade or the properties identified in UFSAR Table 8-38.

TNs response: TN understands the question and will revise to resolve use of inconsistent codes. NRCs focus was on yield and ultimate strength. TN will look at AISC 360 Appendix 4 as a starting pointing.

(3) Provide the material specification, yield strength, tensile strength, and source for the tensile and yield strength values in UFSAR Table 8-39. This table identifies the material as ASTM A706 Grade 60, Standard Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete Reinforcement, that is not listed in ASME Section II Part D. The staff note that the footnotes to Table 8-39 Identity the source of information as ASME Section II Part D tables, but ASME Section II, Part D, Table U or Table Y-1 does not include material property data for any grade of this material.

TNs response: TN understands the question and will revise to resolve use of inconsistent codes. TN will look at AISC 360 Appendix 4 as a starting pointing. NRCs concern is with the elevated temperatures.

(4) Clarify the intended application of the material properties for ASTM A706 Grade 60 in Tables 8-24, Material Properties, ASTM A615 Grade 60 and ASTM A706 Grade 60 Reinforcing Steel, and Table 8-39, Material Properties, ASTM A706 Gr. 60. The staff notes that both tables include material properties for ASTM A706 Grade 60, but the material property values and sources referenced for these values are different.

TNs response: Properties in two tables are different. Slight discrepancy. Table 8-39 will be updated to AISC 360 Appendix 4.

This information is needed to satisfy the requirements of 10 CFR Part 72.236(b).

Related Structural Clarifications S-1 Since the design of the Flat Plate Support (FPS) structure for the EOS-HSM-SC has now changed as a result of this amendment, please submit the design calculations that support the values reported in UFSAR Tables 3.9.8-11 to 3.9.8-13.

This information is needed to satisfy the requirements of 10 CFR Part 72.236(b) and (l).

TNs response: TN will provide supporting calcs for the change in this amendment.

S-2 For the revision of the FPS structure, verify that adding Note 22 to revision 0E of Drawing EOS01-3300-SAR (for the EOS-HSM-SC) to increase the thickness of stiffener plates 113 and 114 shown on Drawing EOS01-3000-SAR (for FPS structure) will be sufficient to invoke this change in the fabrication of the FPS rails, when no revision is made to Drawing EOS01-3000-SAR.

This information is needed to satisfy the requirements of 10 CFR Part 72.150, 72.236(b) and (l).

TNs response: TN believes note on drawing is sufficient. No further response needed.

S-3 In UFSAR section 3.9.8.10.2, a 12 x 1 plate is mentioned in a list of FPS items designed per the AISC 360 Code. Provide an item number(s) from drawing EOS01-3000-SAR to help identify the function of this item for staff.

This information is needed to satisfy the requirements of 10 CFR Part 72.236(b) and (l).

TNs response: It is Item 106 on drawing EOS01-3000. No further response needed.

S-4 In UFSAR sections 2.1.2, 2.4.2.2, and 8.2.1.3 a change was made from the previous version to say that the EOS-HSM-SC is designed per AISC N690 Code but constructed per AISC 360. A statement was added that important-to-safety welding is performed per AWS D1.1 Code. Explain why these two changes were made.

This information is needed to satisfy the requirements of 10 CFR Part 72.236(b) and (l).

TNs response: TNs preference is to keep consistent with commercial construction requirements but will review to determine if any notes are needed to meet design requirements.

S-5 Assumption 5 of calc EOS01-0262 R2 says that the reductions in temperature-dependent material properties for the A29 headed studs and A706 or A449 tie bars are scaled to those of the A572 Grade 60 materials. Is this statement still true, or are the temperature-dependent properties tabulated in FSAR section 8 now being employed?

This information is needed to satisfy the requirements of 10 CFR Part 72.236(b) and (l).

TNs response: Based on discussion for RA 8-3, TN understands this question and will review calculations to align material properties with FSAR tables.