ML081580034
| ML081580034 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 06/04/2008 |
| From: | Duke Power Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML081580034 (7) | |
Text
Meeting with United States Nuclear Regulatory Commission Rockville, MD June 4, 2008 Duke
Participants:
Stephen Newman, Regulatory Compliance Lawrence Llibre, Major Projects Group Clifford Davis, Major projects Group Dr. Sami Rizkalla, Testing Director, NCSU Constructed Facilities Lab Agenda:
Introductions
Purpose of Meeting Brief Description of Natural Phenomenon Barrier System (NPBS) Modifications Employing a Fiber-Reinforced Polymer (FRP) System Proposed Utilization of FRP System on Solid Concrete Brick Masonry
> Overview of FRP Test Program Presently Being Conducted at North Carolina State University
- Discussion of FRP Test Program and NRC's Questions/Concerns
> Closing Remarks
~Duke Description of NPBS Modifications o
Unit 3 Control Room North Wall fortify wall to address tornado wind & differential pressure loads and tornado-generated missiles
> install structural steel barriers (wind, differential pressure, and missiles)
Standby Shutdown Facility (SSF) Systems Located within Units 1, 2, and 3 West Penetration and Cask Decontamination Tank Rooms
> improve protection of SSF-related cabling and piping from tornado wind & differential pressure loads and tornado-generated missiles
> apply FRP s em directly to existing masonry construction (differential pressure) and install heavy-duty siding / girt system (wind) utilize TORMIS (missiles)
June 4, 2008 I
Duke Description of NPBS Modifications YPower o
SSF Diesel Fuel Tank Vents protect vent path from tornado wind load and tornado-generated missiles reconfigure vent located immediately adjacent to SSF wall and install structural steel barrier modification complete o
SSF Trench Cover protect elevated portion of cable / pipe trench from tornado wind &
differential pressure loads and tornado-generated missiles install reinforced concrete structure over affected portion of trench modification complete o
Units 1, 2, and 3 Borated Water Storage Tanks (BWST's) improve protection of critical volume of each unit's BWST from tornado-generated missiles install structural steel barrier wall with independent foundation June 4, 2008 2
Duke
'Power Description of NPBS Modifications Unit 3 Control Room North Wall Interior Masonry Wall --\\
SSF Exposed Trench June 4, 2008 3
PDuke 6Power Proposed Solution Using FRP System o Application: Bond-critical application for flexural strengthening of non-load bearing, infill masonry walls to resist higher design loads.
o Loading Condition: Uniform pressure on masonry wall resulting from tornado-induced differential pressure causing tensile stresses in FRP system.
Note: FRP system will not be relied upon as a compressive reinforcement.
June 4, 2008 4
Duke Proposed Solution Using FRP System 6CPower o Location: Surfaces of selected Units 1, 2, and 3 West Penetration and Cask Decontamination Tank Room walls.
o Cask Decontamination Tank Room walls: single wythe, in-fill panels constructed of hollow-core concrete blocks (corrected Safety Evaluation received March 26, 2008)
West Penetration Room walls: double wythe, in-fill panels constructed of solid concrete bricks (subject of current testing program and future LAR)
June 4, 2008 5
Duke
'Power Proposed Solution Using FRP System Typical FRP Application Existing Unreinforced Masonry Wall Vertical FRP Reinforcing I
Horizontal FRP Reinforcing June 4, 2008 6