ML19003A315

To Integrated Final Safety Analysis Report, Chapter 2, Section 2.4.10, Flooding Protection Requirements

ML19003A315
Person / Time
Site:	Turkey Point
Issue date:	12/21/2018
From:	Florida Power & Light Co
To:	Office of New Reactors
Shared Package
ML19003A318	List: L-2018-237, Integrated Final Safety Analysis Report Tier 1, Rev. 0 ML19003A292 ML19003A296 ML19003A298 ML19003A299 ML19003A300 ML19003A301 ML19003A302 ML19003A304 ML19003A306 ML19003A307 ML19003A308 ML19003A309 ML19003A311 ML19003A312 ML19003A313 ML19003A314 ML19003A315 ML19003A317 ML19003A319 ML19003A320 ML19003A321 ML19003A322 ML19003A323 ML19003A324 ML19003A325 ML19003A326 ML19003A327 ML19003A328 ML19003A329 ML19003A330 ML19003A331 ML19003A332 ML19003A333 ML19003A334 ML19003A335 ML19003A336 ML19003A337 ML19003A338 ML19003A339 ML19003A340 ML19003A341 ML19003A342 ML19003A344 ML19003A345 ML19003A347 ML19003A348 ML19003A349 ML19003A350 ML19003A351 ... further results
References
L-2018-237
Download: ML19003A315 (1)

Text

2.4.10-1 Revision 0 Turkey Point Units 6 & 7 - IFSAR 2.4.10 Flooding Protection Requirements The design basis flood elevation for Units 6 & 7 is established at 24.8 feet NAVD 88, as presented in Subsection 2.4.2.2. The design basis flood elevation is a result of the probable maximum storm surge including wave run-up, details of which are described in Subsection 2.4.5. The elevations of floor entrances and openings of all safety-related structures (also referred to as the design plant grade elevation, which is 100 feet, or 30.48 meters, for the AP1000 reference datum) are at 26 feet NAVD 88. Because the design basis flood elevation is below the entrance floor elevations of the safety-related structures, the safety functions of the plant are not affected by the design basis flood event.

Subsection 2.4.2.3 describes the flood elevation as a result of the local intense precipitation (also referred to as the local probable maximum precipitation or local PMP) for Units 6 & 7. The local PMP flood analysis is performed on the conservative basis that all underground storm drains and culverts are clogged. As indicated in Subsection 2.4.2.3, the maximum flood water level in the Units 6 & 7 power block area, where safety-related structures, systems, and components (SSCs) are located, is 24.5 feet NAVD 88 during the local PMP storm event. Consequently, the local PMP storm event does not cause flooding impacts to the safety-related SSCs.

Because none of the Units 6 & 7 safety-related SSCs are adversely affected by any of the postulated flood events, no flood protection measures are required for Units 6 & 7. Additionally, no technical specifications or emergency procedures to implement flood protection activities are required.

As addressed in Subsection 3.4.1.1.1, the roofs of safety-related structures are designed to preclude accumulation and ponding of water during storms, including the local PMP event. The design basis snow and probable maximum winter precipitation load on the roofs of safety-related structures is presented in Subsection 2.3.1.3.4.

The Units 6 & 7 plant area is built up to higher elevations from the adjacent grade and is surrounded by a retaining wall structure with the top of the wall elevation varying from 20 feet to 21.5 feet NAVD

88. The safety-related structures of Unit 6 and Unit 7 are at least 750 feet and 690 feet away from the nearest retaining wall, respectively. In addition, the retaining wall, though not a safety-related structure, is designed to withstand the hydrostatic and hydrodynamic forces from hurricane surge up to the probable maximum storm surge and coincidental wave run-up actions.