ML19309F549

Discusses Faulting in Unit 1 ESW Pumping Station & Unit 2 Turbine Bldg Area.Nrc Considers Fault Zones 15 & 16 to Be Associated W/Deformational Activity Related to Early Geologic History of Region.Util 800219 & s Encl

ML19309F549
Person / Time
Site:	Phipps Bend
Issue date:	04/08/1980
From:	Rolonda Jackson Office of Nuclear Reactor Regulation
To:	Baer R Office of Nuclear Reactor Regulation
References
NUDOCS 8004300021
Download: ML19309F549 (1)

Text

{{#Wiki_filter:% 800.4300021 y- _ vg k UNt1LD S TA TEs ,.[g NUCLEAR REGULATORY COMMISSION 4 1 C WASHING T ON, D. C. 20555 %,, [(e APR 8 1980 MEMORANDUM FOR: Robert L. Baer, Chief Light Water Reactors Branch No. 2, DPM FROM: Robert E. Jackson, Chief Geosciences Branch, DSS

SUBJECT:

FAULTING IN UNIT 1 ESW PUMPING STATION AND UNIT 2 TURBINE BUILDING AREA t As per the requirements outlined in our August 14, 1978 memorandum, J. Wills of the Tennessee Valley Authority (TVA) informed S. Wastler on September 24 and October 22, 1979 that additior.al faulting had been discovered at the Phipps Send Nuclear Plant. The NRC staff has received and evaluated the attached TVA letter reports. The reports dated October 24,1979 and February 19, 1980 respectively are entitled " Reverse and Transverse Faults in the Unit 1 ESW Pumping Station" (TVA designated number 15) and " Fault Zone in the Rock Foundation for the Unit 2 Turbine Building" (TVA designated number 16). These reports provide the geologic data and mapping of Fault 7ones 15 and 16. Based on the NRC staff's evaluation of these reports, similar past TVA reports / and the resulti g staff fault evaluations (e.g. November 1,1979), the f staff considers fault zones 15 and 16 to be associated with deformational g activity related to the region's carly geologic history, sometime before i 250 million years before present. In addition, the staff agrees with TVA in that Fault zone 16 is the extention of faults 7, 8 and 9. Faults 7, 8 and 9 are discussed in the July 18, 1979 memorandum from R. Jackson to Robert Baer. Therefore, the staff considers the faults non-capable within the meaning of Appendix A to 10 CFR Part 100. y-b.e de A Robert E. Jagkson, Chief Geosciences Brdnch, DSS

Enclosure:

As' stated cc: w/ enclosure J. Faight R. J ackson L. Reiter J. Greeves. R. Benedict S. Wastler S. Goldberg PDR l ocal PDR

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400 Chestnut Street Icwer II February 19, 1980 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. Denton:

In the Matter of the Application of ) Docket Nos. STN 50-553 Tennessee Valley Authority ) STN 50-554_ In a October 22, 1979, telephone conversation, Jerry Wills of my staff notified Bob Benedict of your staff that an additional fault had been, discovered at our Phipps Bend Nuclear Plant in the unit 2 turbine building A conference call was subsequently made to the NRC geologist, area. Sandra Wastler, on October 23, 1979, to discuss the fault. The enclosure provides a detailed description of this feature. We do not consider this minor fault to be capable within the meaning of Appendix A to 10 CFR Part 100. Very truly yours, TENNESSEE VALLEY AUTHORITY ff$, ]^.A L. M. Mills, Manager Nuclear Regulation and Safety Enclosure a a toongapys 9 4 i ~ 'A 390 L

PHIPPS BEND Nt' CLEAR PLANT Fault "one In The Rock Foundation For ~ The Unit 2 Turbine B'ilding Centinued excavation of the weathered rock in the south end of the Unit 2 turbine building has exposed complex-folding and faulting (see attached map A). This.areaLis defined by a weathered, faulted, contorted rock zone striking approximately N.50 E and dipping from horizontal to vertical, but generally parallel to the regional dip. 'On the east perimeter of the turbine building excavation, the faults extend under the overburden. They are exposed again by excavation 300 feet to the east in the CCW trench, from which they can be traced along the excavated rock surface to the CCW pumping station (see attached map B). This fault zone (designated number 16) is an extension of. faults 7, 8 and 9, located in the CCW pumping station fcundation. This was reported to NRC in a memorandum from J. E. Gilliland to H. W. Centon, dated April 30,1979 (tiEB 790502 521). Examination of the overburden-rock contact around the perimeter of the excavation has revealed no offsetting of Quaternary terrace de-posits. The folds and faults in the Unit 2 turbine building excavation-show no evidence which would indicate that they did not occur in the early tectonic development of the Paleozoic (250+ million years). folding and faulting in this araa. These faults, having been stable -for 250 ; million years are not considered to be capable of producing ground off-sets or generating earthquakes. Therefore, we-do not classify them as capable faults, within the meaning of Appendix A to 10CFR part.100. e e

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400 Chestnut Street Tower II October-24, 1979 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Co= mission Washington, DC 20555

Dear Mr. Denton:

In th*e Matter of the Application of ) Docket Nos. STN 50-553 Tennessee Valley Authority ) STN 50-554 In a September 24, 1979, telephone conversation, Jerry Wills of my staff notified Bob Benedict of your staff that additional f aults had Unen discovered at our Phipps Bend Nuclear Plant in the area of the tuit l'ESW i pumping station. A conference call was subsequently made to the NRC geologist, Sandra Wastler, on September 24, 1979, to discuss the fault. The enclosure provides a detailed description of this feature. We do not consider this minor fault to be capable within the meaning of Appendix A to 10 CFR Part 100. Very truly yours, TENNESSEE VALLEY AUTHORITY '( ; i l i st.l. .s L. M. Mills, Manager ~ Nuclear Regulation and Safety Enclosure i 7 91 os 00 / s5'Jf' 0

PHIPPS BEND NUCLEAR PLANT REVERSE AND TRANSVERSE FAULTS IN THE UNIT 1 ESW PUMPING STATION Geologic mapping of foundation bedrock in the Unit 1 ESW pumping station has revealed two reverse ' faults in the southeast quadrant of the building, and two transverse faults located west of the reverse faults. They are grouped as fault zone 15 and designated R1, R2, T1,. and T2 (see attached photos and drawing for locations). Faults R1 and R2 are reverse faults parallel to the axis of an anticline to the southeast. R1 dips 67* NW. and strikes N. 50* E. R2 dips 76* SE. and strikes N. 50* E. Both fault traces are defined by calcite-healed fractures that extend across the floor of the excavation from the south wall-to the east wall of the building. Transverse faults T1 and T2 are located west and northwest, respec-tively, of R1 and R2. T1 consists of three nearl'y vertical branches, one striking N. 52* W., and the other two striking N.10* E. The fault traces are defined by calcite-healed fractures that offset bedding from 3 to 7 inches. T2 is 70 feet north of T1 and exhibits essentially the same characteristics. All four faults described were formed during the Paleozoic Era and are characteristic of tectonic forces that developed during the formation of the Saltville fault family. These faults, having been stable for 250 my, are not considered to be capable of producing ground offsets or generating earth-quakes. Therefore, we do not classify them as capable faults, 'within the meaning of Appendix A to 10 CFR Part 100.

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