ML23067A052

SLRA - Scoping and Screening, Sections 2.3.3.2 and 2.3.3.4

ML23067A052
Person / Time
Site:	Saint Lucie
Issue date:	03/08/2023
From:	Vaughn Thomas NRC/NRR/DNRL/NLRP
To:
References
Download: ML23067A052 (4)

Text

St. Lucie SLRA: Breakout Questions SLRA Sections 2.3.3.2 & 2.3.3.4 Scoping and Screening:

TRP:

Note: Breakout Questions are provided to the applicant and will be incorporated into the publicly-available audit report.

Technical Reviewer David Nold 12/27/2021 Acting Technical Steve Jones 01/11/2022 Branch Chief Breakout Session Applicant Staff NRC staff To be filled out by PM during breakout Question SLRA SLRA Background / Issue Discussion Question / Request Outcome of Discussion Number Section Page (As applicable/needed) 1 2.3.3.2 491 of FSAR Section 9.2.2.3.3 Service SLRA Table 3.3.2-2 Component 1572 Environment reads in part: Component Cooling Water -

Cooling (Page The component cooling water pumps, Summary of Aging Water 3.3-99) heat exchangers and portions of the Management Evaluation for System piping and valves are located outdoors. Component Type Pump These components are designed to Casing (component cooling operate under the following water) does not contain an environmental conditions: ambient air Environment of Air - outdoor temperature from 30°F to 120°F, 100 (ext) for the Unit 1 Component percent humidity, salt laden atmosphere, Cooling Water pumps 1A, 1B &

torrential rains and hurricane winds. 1C.

SLR-8770-G-083 Florida Power and Light St. Lucie Nuclear Unit 1 - Flow The staff requests additional Diagram Component Cooling System clarification as to whether Unit Sheet 1A, Coordinate H-6 displays the 1 Pump 1A, 1B & 1C casings

component cooling water pumps, are exposed to the harsher thermowells, heat exchangers and outdoor environment as portions of the piping and valves as described in FSAR Section being in the Component Cooling Area. 9.2.2.3.3.

2 2.3.3.4 521 & SLRA Table 3.3.2-4 Diesel Generators The staff requests information Diesel 522 of and Support Systems - Summary of pertaining to the lack of Generators 1572 Aging Management Evaluation contains a symmetry between the Unit 1 and (Pages Component Type Tank (Unit 1 diesel oil and Unit 2 Diesel Oil Storage Support 3.3- storage) for the Material Coating with tanks internal environments.

Systems 129 & an Environment of Air - outdoor (int).

3.3-130) In contrast, Table 3.3.2-4 contains two line-items for two different internal tank environments for the Component Type Tank (Unit 2 diesel oil storage) pertaining to the Material Coating. The internal tank environments listed are: Air

- indoor uncontrolled (int) and Fuel Oil (int).

3 2.3.3.4 500 SLRA Section 2.1.4.2 Nonsafety-Related The subject Vent to Outside Diesel thru Affecting Safety-Related - 10 CFR Diesel Generator Bldg lines Generators 526 of 54.4(a)(2) reads in part: appear to meet the and 1572 In accordance with 10 CFR 54.4(a)(2), requirements of 10 CFR Support (Table the SSCs within the scope of license 54.4(a)(2) (i.e., the first bullet Systems 3.3.2- renewal include: above). The staff request

4) additional information:

2.1.4.2 All nonsafety-related systems, structures,

• to clarify the intended Nonsafety- and components whose failure could function of the Unit 2 Related prevent satisfactory accomplishment of screening components and Affecting any of the functions identified in 10 CFR where these components are Safety- 54.4(a)(1)(i), (ii), or (iii). reflected in SLRA Table 3.3.2-Related 4; This scoping criterion requires an

• to clarify whether the Unit 1 assessment of NNS SSCs with respect to Vent to Outside Diesel the following application or configuration Generator Bldg lines contain categories: similar screen components but

not shown on the respective

• NNS SSCs that may have the potential SLR boundary drawings; and to prevent satisfactory accomplishment whether the Unit 1 & Unit 2 of safety functions, Vent to Outside Diesel

• NNS SSCs directly connected to SR Generator Bldg lines contain SSCs that provide structural support for flame arrestors subject to AMR the SR SSCs, and with an intended function of fire

• NNS SSCs that are not directly protection.

connected to SR SSCs but have the potential to affect SR SSCs through spatial interactions.

SLR-2998-G-096 Florida Power and Light St. Lucie Nuclear Unit 2 - Flow Diagram Emergency Diesel Generator System Diesel Engine 2A1 Sheet 1A, Coordinate A-4 displays Quality Group D pipe 2-DG-237 as a Vent to Outside Diesel Generator Bldg from the Diesel Oil Day Tank 2A1. The last component on the end of this pipe is not defined on the Unit 2 Legend drawing 2998-G-078 contained on the Curtiss Wright e-portal.

This last component appears to be a type of screening (e.g., strainer / bird screen) device. In addition, there is no flame arrestor displayed as being contained in this vent line. SLRA Table 3.3.2-4:

Diesel Generators and Support Systems

- Summary of Aging Management Evaluation does not contain a component type Screen and the listings of Component Type Strainer do not contain an external environment of Air -

outdoor (ext) with an internal environment of Diesel exhaust (int).

Nearly similar Unit 2 configurations are displayed on drawings: SLR-2998-G-096, Sheet 2A (for Diesel Oil Day Tank 2A2);

SLR-2998-G-096, Sheet 1B (for Diesel Oil Day Tank 2B1); and SLR-2998-G-096, Sheet 2B (for Diesel Oil Day Tank 2B2).

In comparison, Unit 1 drawing SLR-8770-G-096, Sheet 1A Florida Power and Light St. Lucie Nuclear Unit 1 - Flow Diagram Emergency Diesel Generator System Diesel Engine 1A1, Coordinate F-3, displays Quality Group D pipe 2-DG-193 as a Vent to Outside Diesel Generator Bldg from the Diesel Oil Day Tank 1A1.

Pipe 2-DG-193 does not display a screen component at the discharge of the pipe nor does the drawing show flame arrestors within the pipe from Tank 1A1 to the atmosphere. Nearly similar Unit 1 configurations are displayed on drawings: SLR-8770-G-096, Sheet 1B (for Diesel Oil Day Tank 1A2); SLR-8770-G-096, Sheet 2A (for Diesel Oil Day Tank 1B1); and SLR-8770-G-096, Sheet 2B (for Diesel Oil Day Tank 1B2).

ML23067A052