ML20076K039
| ML20076K039 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 07/01/1983 |
| From: | Fiedler P GENERAL PUBLIC UTILITIES CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| TASK-03-03.A, TASK-3-3.A, TASK-RR NUDOCS 8307080010 | |
| Download: ML20076K039 (3) | |
Text
.
GPU Nuclear Corporation M
ys 100 Interpace Parkway w
a Parsippany, New Jersey 07054 201 263-6500 TELEX 136 482 Writer's Direct Dial Number:
July 1, 1983 Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch f5 Division of Licensing U.S. Nuclear Reguls;.ary Commission Washington, D. C.
20555
Dear Mr. Crutchfield:
bubject: Oyster Creek Nuclear Generating Station Docket No. 50-219 SEP Topic No. III-3A, Effects of High Water Level on Structures During the integrated assessment of the subj ect SEP topic, the NRC staff requested GPUN demonstrate that safety-related structures remain functional for a short-term hydrostatic loading and can resist floatation up to 22 ft.
mean sea level (MSL).
GPUN has recently completed analyses for hydrostatic loading and floatation resistance for the following structures:
Reactor Building Turbine Building Diesel Generator Building New Radwaste Building Results of the analyses are summarized below:
Reactor Building Floatation - Reactor Building exhibits a factor of safety against floatation in excess of 1.10 as required by NUREG 0800 considering only a portion of the available dead load.
Foundation Wall Integrity - For a water table elevation of 23'-0",
our calculation indicates that the wall exhibits sufficient capacity to carry all required loads indicated below.
This demonstrates structural adequacy of wall construction.
e307080010 830701 PDR ADOCK 05000219 I
P PDR GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
Base Mat Structural Integrity - Hydrostatic uplift pressure is less than the minimum soil bearing pressure.
Therefore, the mat foundation is unaffected by increased water depth.
Loadings considered for the Reactor Building analyses are:
- 1) hydrostatic pressure
- 2) soil lateral pressure
- 3) 200 psf surcharge at grade level
- 4) adjacent foundation loadings Vertical dead and live load reactions from floors and walls above the point of stress calculation were not considered in the design combinatier s for maximum lateral hydrostatic and soil pressure.
This results in a conservative design condition, since the reinforcing steel requirements are overstated.
Turbine Building Floatation - The turbine building exhibits a factor of safety against floatation in excess of 1.10 considering available dead load only.
Foundation Wall Integrity - For a water table elevation of 23'-0",
all reinforcing steel was determined to be adequate to resist the applied loading without exceeding the allowable working level stress of 20,000 psi.
Base Mat Structural Integrity - Hydrostatic uplift pressure is less than the minimum soil bearing pressure due to dead load acting alone.
Therefore, the mat foundation is unaffected by the increased water depth.
Loadings considered for the Turbine Building analyses are:
- 1) hydrostatic pressure
- 2) soil lateral pressure
- 3) 200 psf surcharge at grade
- 4) adjacent foundation loadings
- 5) floor dead loads
- 6) floor live loads
- 7) wall dead load Diesel Generator Building Floatation - The Diesel Generator Building exhibits a factor of safety against floatation in excess of 1.10 considering available dead load only.
Foundation Wall Integrity - The floor of the Diesel Generator Building is at elevation 23 '-0" MSL which is the same elevation as the flood water.
Therefore, there is no hydrostatic preebure on the walls.
Base Mat Structural Integrity - Hydrostatic uplift pressure is less than the minimum soil bearing pressure due to dead load acting alone.
Therefore, the mat foundation is unaffected by the increased water depth.
_ ~_
New Radwaste Building Floatation - The new Radwaste Building exhibits a factor of safety against floatation in excess of 1.10 considering available dead load only.
Foundation Wall Integrity - The floor of the new Radwaste Building at elevation 23'-0" MSL which is the same elevation as the flood water.
Therefore, there is no hydrostatic pressure on the walls.
Base Mat Structural Integrity - Hydrostatic pressure is less than the minimum soil bearing pressure due to dead load acting alone. Therefore, the mat foundation is unaf fected by the increased water depth.
Very truly yours, A1 p
nl _^&
V1 -
Pe.ter tedler Vice President and Director Oyster Creek 1r l