ML22024A036

Breakout Questions - Trp 60 - Fatigue Monitoring

ML22024A036
Person / Time
Site:	Oconee
Issue date:	01/19/2022
From:	Angela Wu NRC/NRR/DNRL/NLRP
To:
Wu A, 301-415-2995
Shared Package
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References
Download: ML22024A036 (4)

Text

Oconee SLRA: Breakout Questions SLRA Section B3.1, Fatigue Monitoring TRP: 60 Question SLRA SLRA Background / Issue Discussion Question / Request Number Section Page (As applicable/needed) 1 B3.1 B-281 SLRA Section B3.1 indicates that the high 1. Clarify whether the implicit energy line break (HELB) analyses do not fatigue analysis (SLRA exclude break locations based on fatigue 4.3.3) for the Non-Class 1 so that the Fatigue Monitoring program piping systems, which does not apply to HELB. This discussion involves a stress range does not clearly describe whether the reduction factor, has a implicit fatigue analysis (SLRA 4.3.3) for potential impact on the the Non-Class 1 piping systems, which HELB location postulation.

involves a stress range reduction factor, If so, identify the HELB may have a potential impact on the HELB analysis as a TLAA and location postulation. provide the disposition of the TLAA and its basis.

In addition, the staff finds a need to clarify whether the HELB location postulation does not use cumulative usage factors as 2. Clarify whether the HELB an input for the break location location postulation does determination. not use cumulative usage factors as an input for the break location determination.

Question SLRA SLRA Background / Issue Discussion Question / Request Number Section Page (As applicable/needed) 2 B3.1 B-281 SLRA Section B3.1 states that the 1. Clarify whether the Fatigue program assures that the number of Monitoring program ensures occurrences of each critical transient that each design cycle as remains within the limits of the fatigue well as the CUF and analyses. The SLRA also indicates that environmental CUF limits the design transients and associated (1.0) is not exceeded during design cycles are listed in Oconee the subsequent period of UFSAR Tables 5-2 (RSC other than extended operation. If not, pressurizer surge line) and 5-23 provide the basis for why (pressurizer surge line). each design cycle is not identified as the limits of the This discussion does not clearly address fatigue analyses.

whether the Fatigue Monitoring program ensures that each design cycle as well as the CUF and environmental CUF limit 2. Clarify whether the cycle (1.0) is not exceeded during the counting surveillance limit subsequent period of extended operation. addressed in Enhancement 3 includes the design cycles Enhancement 3 of the program, in part, (UFSAR Tables 5-2 and 5-states that the program will be enhanced 23) and other cycles to expand existing corrective action assumed in flaw evaluations guidance associated with exceeding a (e.g., flaw tolerance and cycle counting surveillance limit. crack growth evaluations)

Clarification is needs as to what the cycle as well as the CUF and counting surveillance limit means. environmental CUF limit.

Question SLRA SLRA Background / Issue Discussion Question / Request Number Section Page (As applicable/needed) 3 B3.1 B-281 The following reference addresses stress- 1. Describe the stress-based based fatigue crack growth analyses and monitoring activities that related activities (AD-EG-ALL-1632, are performed in the Revision 2, Integrated Fatigue Fatigue Monitoring Management, Section 5.5.5, Item 2.c). program, including the The procedure also refers to the components under the FatiguePro and WESTEM software as stress-based fatigue applicable computer software. monitoring.

These observations suggest that the Fatigue monitoring program uses stress- 2. Discuss the stress-based based monitoring for fatigue fatigue crack growth management. However, SLRA Section monitoring activities and B3.1 does not clearly discuss the stress- related analyses that are based monitoring activities that are referenced in the program conducted as part of the Fatigue procedure (AD-EG-ALL-Monitoring program. 1632, Revision 2, Item 2.c).

In addition to the stress-based monitoring activities, the staff also needs to confirm that automatic cycle counting are 3. Clarify whether automatic performed by using the FatiguePro and cycle counting are WESTEM software in the Fatigue performed by the using the Monitoring program. FatiguePro and WESTEM software in the Fatigue Monitoring program.

4 UFSAR UFSAR, Table 18-1 lists the programs, 1. Clarify whether the Table activities and TLAAs for the initial license Thermal Fatigue 18-1 renewal term (60-year operation). The Management in UFSAR table does not identify the Fatigue Table 18-1 is the existing Monitoring program but does identify the program of the Fatigue Thermal Fatigue Management program Monitoring program for the related to fatigue monitoring activities and subsequent period of TLAAs. extended operation. If not,

Question SLRA SLRA Background / Issue Discussion Question / Request Number Section Page (As applicable/needed)

The staff needs to clarify whether the identify the existing existing Thermal Fatigue Management is program of the Fatigue the existing program of the Fatigue Monitoring program.

Monitoring program for the subsequent period of extended operation.