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Tennessee Valley Authority Division of Engineering Design Civil Engineering Branch Geologic Services PIIIPPS BEND NUCLEAR PLANT GEOLOGIC FOUNDATION REPORT DESCRIPTIONS OF FAULTS 19-25 Andrew P. Avel Supplement 1 to Revision 1 (November 1980)
Tennessee Valley Authority Division of Engineering Design Civil Engineering Branch Geologic Services PIIIPPS BEND NUCLEAR PLANT GEOLOGIC FOUNDATION REPORT DESCRIPTIONS OF FAULTS 19-25 Andrew P. Avel Supplement 1 to Revision 1 (November 1980)
Knoxville, Tennessee December 1980 1
Knoxville, Tennessee December 1980 1
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l 8101220$l\i


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   , .                                    PHIPPS BEND NUCLEAR PLANT GEOLOGIC FOUNDATION REPORT DESCRIPTIONS OF FAULTS 19-25 s
                  *
Introduction Since March 1980, seven additional faults have been mapped in the founda-tion bedrock at Phipps Bend Nucl' ear Plant. Four faults are located in the unit 1 essential service water spray pond, and three are in the unit I control and division 1 diesel generator buildings (Exhibit 1). Reports referenced in the following general descriptions are transmittals from the TVA Office of Power to the NRC Office of Nuclear Reactor Regulation.
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   , .                                    PHIPPS BEND NUCLEAR PLANT
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GEOLOGIC FOUNDATION REPORT DESCRIPTIONS OF FAULTS 19-25 s
Introduction Since March 1980, seven additional faults have been mapped in the founda-tion bedrock at Phipps Bend Nucl' ear Plant. Four faults are located in the unit 1 essential service water spray pond, and three are in the unit I control
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and division 1 diesel generator buildings (Exhibit 1). Reports referenced in the following general descriptions are transmittals from the TVA Office of Power to the NRC Office of Nuclear Reactor Regulation.
Descriptions Fault 19, reported on June 3, 1980, is a transverse fault located on the southern perimeter of the unit 1 essential service water spray pond (Exhibit 2).
Descriptions Fault 19, reported on June 3, 1980, is a transverse fault located on the southern perimeter of the unit 1 essential service water spray pond (Exhibit 2).
The fault trace is defined by a weathered zone approximately 8 inches wide, striking N. 42    W. and dipping nearly vertical. Bedding is offset (right-lateral movement) a maximum of 8 inches at its intersection with the fault zone. The fault extends southeastward under the overburden and northwestward 35 feet into the excavation, where it transitionally terminates into a near-i vertical joint. Where the fault intersects Quaternary terrace deposits, no deformation was observed.
The fault trace is defined by a weathered zone approximately 8 inches wide, striking N. 42    W. and dipping nearly vertical. Bedding is offset (right-lateral movement) a maximum of 8 inches at its intersection with the fault zone. The fault extends southeastward under the overburden and northwestward 35 feet into the excavation, where it transitionally terminates into a near-i vertical joint. Where the fault intersects Quaternary terrace deposits, no deformation was observed.
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Faults 21 and 22, reported on August 22,.1980, are reverse faults located in the west half of the unit 1_ essential service water spray pond (Exhibit 2).
Faults 21 and 22, reported on August 22,.1980, are reverse faults located in the west half of the unit 1_ essential service water spray pond (Exhibit 2).
Both faults strike N. 40  E. and dip away from each other at 83    SE. (21) and 58 .NW. (22). Both fault plancs are defined by calcite zones, 0.5 to 3.0 inches wide, which show minimal deformation of adjacent beds. These faults were traced to their intersections with the Quaternary terrace deposits, which showed no evidence of deformation.
Both faults strike N. 40  E. and dip away from each other at 83    SE. (21) and 58 .NW. (22). Both fault plancs are defined by calcite zones, 0.5 to 3.0 inches wide, which show minimal deformation of adjacent beds. These faults were traced to their intersections with the Quaternary terrace deposits, which showed no evidence of deformation.
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to vertical. They truncate the north limb of an anticline and intersect the axis of a syncline.
to vertical. They truncate the north limb of an anticline and intersect the axis of a syncline.
Fault 25 is a thrust fault which is located in the north end of the division 1 control building. The fault plane is defined by a weathered zone i
Fault 25 is a thrust fault which is located in the north end of the division 1 control building. The fault plane is defined by a weathered zone i
l              1 to 3 inches wide, striking N. 51    E. and dipping 6  SE. in the south section and 33  NW. in the north section. Little or no deformation of adjacent beds
l              1 to 3 inches wide, striking N. 51    E. and dipping 6  SE. in the south section and 33  NW. in the north section. Little or no deformation of adjacent beds I
:
was mapped.
I was mapped.
Summary l
                                                                  '
Fault 19 is a transverse fault formed by stress relief due to pressure l              from the northwest and southeast during formation of the Saltville fault i                                                .
Summary
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l Fault 19 is a transverse fault formed by stress relief due to pressure l              from the northwest and southeast during formation of the Saltville fault i                                                .
:  .


r                                                                                      T s .
r                                                                                      T s .
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family (250 mybp). All others are either thrust or reverse faults which resulted from similar stresses during the same time period (Paleozoic Era).
family (250 mybp). All others are either thrust or reverse faults which resulted from similar stresses during the same time period (Paleozoic Era).

Revision as of 09:05, 31 January 2020

Geologic Foundation Rept Descriptions of Faults 19-25, Suppl 1 to Revision 1
ML19341A144
Person / Time
Site: Phipps Bend  Tennessee Valley Authority icon.png
Issue date: 12/31/1980
From: Avel A
TENNESSEE VALLEY AUTHORITY
To:
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ML19341A142 List:
References
NUDOCS 8101220211
Download: ML19341A144 (4)
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Text

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Tennessee Valley Authority Division of Engineering Design Civil Engineering Branch Geologic Services PIIIPPS BEND NUCLEAR PLANT GEOLOGIC FOUNDATION REPORT DESCRIPTIONS OF FAULTS 19-25 Andrew P. Avel Supplement 1 to Revision 1 (November 1980)

Knoxville, Tennessee December 1980 1

l 1

l 8101220$l\i

S

, . PHIPPS BEND NUCLEAR PLANT GEOLOGIC FOUNDATION REPORT DESCRIPTIONS OF FAULTS 19-25 s

Introduction Since March 1980, seven additional faults have been mapped in the founda-tion bedrock at Phipps Bend Nucl' ear Plant. Four faults are located in the unit 1 essential service water spray pond, and three are in the unit I control and division 1 diesel generator buildings (Exhibit 1). Reports referenced in the following general descriptions are transmittals from the TVA Office of Power to the NRC Office of Nuclear Reactor Regulation.

Descriptions Fault 19, reported on June 3, 1980, is a transverse fault located on the southern perimeter of the unit 1 essential service water spray pond (Exhibit 2).

The fault trace is defined by a weathered zone approximately 8 inches wide, striking N. 42 W. and dipping nearly vertical. Bedding is offset (right-lateral movement) a maximum of 8 inches at its intersection with the fault zone. The fault extends southeastward under the overburden and northwestward 35 feet into the excavation, where it transitionally terminates into a near-i vertical joint. Where the fault intersects Quaternary terrace deposits, no deformation was observed.

Fault zone 20, reported on August 22, 1980, is located in the unit 1 essential service water spray pond (Exhibit 2). The fault zone strikes N. 50 E. and dips 66 SE. It can be traced across the spray pond excavation, extending under the overburden to the NE and SW. The zone consists primarily of two parallel reverse faults separated by a zone of contorted rock. The zone was traced to its intersection with the Quaternary terrace deposits, which showed no evidence of deformation.

l l

I Ii ,

L

v. p 7, 1
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a, 1

Faults 21 and 22, reported on August 22,.1980, are reverse faults located in the west half of the unit 1_ essential service water spray pond (Exhibit 2).

Both faults strike N. 40 E. and dip away from each other at 83 SE. (21) and 58 .NW. (22). Both fault plancs are defined by calcite zones, 0.5 to 3.0 inches wide, which show minimal deformation of adjacent beds. These faults were traced to their intersections with the Quaternary terrace deposits, which showed no evidence of deformation.

Faults 23, 24, and 25, reported on August 22, 1980, are located in the unit 1 control and division 1 diesel generator be.ildings ' (Exhibit 3). An earlier examination revealed no deformation of the Quaternary terra:e deposit.

Fault 23, a reverse fault located in the diesel generator building, extends from ti$e west wall of the fuel building across the excavation c d below the construction fill to the west. The fault plane is defined by a calcite-filled fracture which strikes N. 40 E. and dips 84 SE.

Fault zone 24 consists of interconnecting thrust and reverse faults located in the south end of the diesel generator building. These faults, which are associated with folding, strike N. 35 - 49 E. and dip from 70 SE.

to vertical. They truncate the north limb of an anticline and intersect the axis of a syncline.

Fault 25 is a thrust fault which is located in the north end of the division 1 control building. The fault plane is defined by a weathered zone i

l 1 to 3 inches wide, striking N. 51 E. and dipping 6 SE. in the south section and 33 NW. in the north section. Little or no deformation of adjacent beds I

was mapped.

Summary l

Fault 19 is a transverse fault formed by stress relief due to pressure l from the northwest and southeast during formation of the Saltville fault i .

r T s .

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family (250 mybp). All others are either thrust or reverse faults which resulted from similar stresses during the same time period (Paleozoic Era).

No evidence was found during this investigation which would indicate that the faults did not occur in the early tectonic development of the Paleozoic folding and faulting in this area. The area, having been stable for 250 million years, is not considered to be capable of producing ground offsets

or generating earthquakes. Therefore, we do not classify any of the faults as capable, within the meaning of Appendix A to 10CFR part 100.

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