ML22024A035

Breakout Questions - Trp 47 - Water Control Structures

ML22024A035
Person / Time
Site:	Oconee
Issue date:	01/20/2022
From:	Angela Wu NRC/NRR/DNRL/NLRP
To:
Wu A, 301-415-2995
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Download: ML22024A035 (3)

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Oconee SLRA: Breakout Questions SLRA Section B2.1.34, Inspection of Water-Control Structures Associated with Nuclear Power Plants AMP TRP: 047 Question SLRA SLRA Background / Issue Discussion Question / Request Number Section Page (As applicable/needed) 1 Table 3-1340 Item 3.5.1-060 claims to be consistent Explain why Table 2 items 3.5.1 with NUREG-2191, and manages Loss associated with this Table 1 of material (spalling, scaling) and item are not provided. If cracking due to freeze-thaw. However, determined to be an error or the staff could not find the Table 2 items associated with this Table 1 item. omission, correct SLRA accordingly or provide corresponding Table 2 items.

2 B2.1.34 B-235 SLRA provides enhancements 1, 2, and Clarify whether enhancements 3 to include preventive actions to ensure for preventive actions need to the structural bolting integrity. However, include coating material it does not appear that SLRA includes selection.

an enhancement of preventative actions for coating material selection discussed in Section 2 of Research Council for Structural Connections.

3 B2.1.34 B-236 AMP enhancement 5 is related to sliding Clarify whether enhancement 5 surfaces for Element 3. However, should be related to both enhancement no. 5 also establishes Elements 3 and 6.

acceptance criteria for sliding surface.

4 B2.1.34 B-238 AMP enhancement 14 seems to include 1. Clarify where the sheeting is two separate components (piles and used and how their aging sheeting). The staff understands that effects are managed.

Table 3-1455 sheet piles are located at the exterior of 3.5.2-23 the condenser circulating water intake 2. Clarify which Tables 1 and 2 structure, and sheet piles are included line items are associated with as Table 2 AMR line item in Table 3.5.2- the sheeting.

23. It is not clear to the staff where the sheeting is used.

5 Table 2-303 During the on-site audit, the staff 1. Clarify if metal siding is 2.4.4-1 observed that the Keowee powerhouse subject to aging management structure was covered with metal siding review and will be managed Table 3-1382 during SPEO for Keowee on the exterior, however, metal siding 3.5.2-4. powerhouse, and if so, how appears not to be part of the AMR and where is it addressed in review in Tables 2.4.4-1 and 3.5.2-4. the SLRA.

2. Confirm if metal siding was included in the corresponding Tables 1 and 2 for other structures.

6 B2.1.24 B-234 For the Penstock, Power Tunnels, 1. Explain the rationale and Spillway, and Intake structures, the staff difference in aging Table 3-1386 noticed that aging effects of bolting, management scope of these 2.5.2-4 thru concrete, and steel are managed by two AMPs for the Penstock, 3-1389 both the FERC Inspection programs for Power Tunnels, Spillway, and the Keowee Hydro Station and the Intake structures, and how it is Inspection of Water-Control Structures determined.

AMP. The staff needs additional clarification regarding the differences 2. How do inspectors know and limitations on scope of inspection of which components are under each particular program. their responsibilities to ensure that no inspection for these components will be missed?

7 2.4.2 2-300 SLRA states the breaker vault is Discuss what supported by the powerhouse operating actions/procedures will be floor, and its walls and roof are taken to ensure that aging constructed of thick concrete. However, effects for inside of the breaker the staff found during the onsite audit vault and its equipment that inside of the breaker vault (e.g. supports will be adequately interior concrete, ceiling) and equipment

supports are not being inspected for managed, and how it is or will aging management. be addressed in the SLRA.

8 N/A N/A During the onsite audit, the staff noticed Clarify whether these aging water infiltration in the area of the draft mechanisms/effects are tube, and calcium leaching on the identified in the previous ARs powerhouse basement wall. It is not (If yes, provide ARs on clear if these aging mechanisms/effects ePortal) and what corrective were identified in the previous actions have been taken.

inspections.

9 Table 3-1436 SLRA Table 3.5.2-19, indicates that a Explain how the steel piping 3.5.2-19 steel piping tunnel from the condenser tunnel can be properly circulating water discharge pipe system managed by the Inspection of exposed to groundwater/soil Water-Control Structures AMP.

environment will be managed for loss of material by the Inspection of Water-Control Structures AMP. The SLRA cited Note F to indicate that this material is not in the GALL-SLR.

10 B.2.1.34 B-234 SLRA states that structural components Clarify whether sluice gates and commodities monitored under this are within the scope of SLR program include sluice gates. and subject to AMR. If yes, explain how their aging effects However, the staff could not locate the are adequately managed associated AMR items, it is not clear during the SPEO?

whether sluice gates are within the scope of SLR and subject to AMR.