ML22035A189

Email from NRC (Angela Wu) to Duke (Paul Guill) - Oconee SLRA - Request for Public Meeting

ML22035A189
Person / Time
Site:	Oconee
Issue date:	01/31/2022
From:	Angela Wu NRC/NRR/DNRL/NLRP
To:	Gambrell R, Guill P Duke Energy Corp
Wu A
References
Download: ML22035A189 (2)

Text

From: Wu, Angela To: Guill, Paul F; Gambrell, Reene Cc: Johnson, Marieliz

Subject:

Oconee SLRA - Request for Public Meeting (Feb 17 @ 1:30pm)

Date: Monday, January 31, 2022 12:54:00 PM

Hello Paul & Reene,

The staff is interested in having a public meeting to discuss the topics below, following receipt of the RAI Responses (ML22010A129). Would February 17 th for a 1.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> public meeting starting at 1:30pm work for you?

TRP 143.2 - Metal Fatigue of Non-Class 1 Components (RAI 4.3.3-2):

The response to RAI 4.3.3-2 indicates that the stress analyses for the pressurizer sampling piping of Oconee Units 2 and 3 meet the acceptance criteria in paragraph 102.3.2(d) of the USAS B31.1 code. The paragraph allows that the difference between the allowable stress at the maximum temperature (Sh) and the sum of longitudinal stresses may be added to the 0.25Sh term of equation (1) of paragraph 102.3.2. Equation (1) calculates the allowable stress range S A using the 0.25Sh term.

However, the following references indicate that the applicant used paragraph 104.8.3.B of the B31.1 code (1977 Edition), which compares the SA+Sh term with the total longitudinal stresses, rather than paragraph 102.3.2(d) that modifies the 0.25Sh term (

References:

Equations 8, 10 and 11 in the stress summary of Calculation No. OSC-2404, Revision 18, page 9 for ONS Unit 2 and Equations 8, 10 and 11 in the stress summary of Calculation No. OSC-2191, Revision 22, page 10 for ONS Unit 3). Please clarify why the applicants response does not cite paragraph 104.8.3.B of the B31.1 code.

TRP 143.9 - Cycle Projections (RAI 4.3.1-1):

Discuss the 80-year cycle estimates of Transients 5, 6, 19, 20A, 20B and 20C in UFSAR Table 5-2 to confirm that the cycle estimates are significantly lower than the design cycles of these transients. Note that the response to RAI 4.3.2-1 indicates that Transients 3 and 4 have a cycle estimate on the order of 1000 cycles.

TRP 143.9 - Cycle Projections (RAI 4.3.1-3):

The response to RAI 4.3.1-3 indicates that the HPI nozzle and reactor vessel head components use reduced transient cycles, as reduced from the design cycles, for 80-year fatigue analyses. Describe the reduced cycles and basis of the reduced cycles (e.g., 80-year projected cycles) for these components.

Thanks!

Angela

Angela Wu, Project Manager NRR/DNRL/NLRP Office: OWFN 11-G3 l Phone: 301-415-2995