ML20058P812
| ML20058P812 | |
| Person / Time | |
|---|---|
| Site: | Neely Research Reactor |
| Issue date: | 10/22/1993 |
| From: | Karam R Neely Research Reactor, ATLANTA, GA |
| To: | Dan Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 9312270284 | |
| Download: ML20058P812 (21) | |
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deorgia Institute of Technology
.$ NEELY NUCLEAR RESEARCH ' CENTER SM 'm '
900 ATLANTIC DRIVE ATLANTA. GEORGIA 30332<l4255.
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- 97 (h04) 894-3600 7
l October 22, 1993
-l Mr. Douglas M. Collins, Chief Nuclear Materials Safety and Safeguards Branch ,
Division of Radiation Safety & Safeguards U.S. Nuclear Regulatory Commission, Region II 101 Marietta St. N.W., Suite 2900 .;
Atlanta, GA 30323-0199 !
Dear Mr. Collins:
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Enclosed are two Blueprints, designated Drawing #1 and #2, that-pertain to the design and construction of the Containment Building.
- which- houses the Georgia Tech Research Reactor. Drawing:. #1 shows (Highlighted by red) that the ground floor (Reactor Basement) is at. I an elevation of 892.92 feet from'" sea level". The floor itself is 7' feet 8 inches thick and made of concrete. ' This floor rests on a steelu plate (1/4 in. thick) . Below the steel plate there is ~a layer-(2 inch thick) of sand and asphalt and below this sand and asphalt there.is' -
a one foot thick layer of concrete. The-steel plate in the floor- i foundation is tied to the cylindrical steel tank (7/16 in thick) to '
form a " sealed" containment structure.
The total thickness of the floor foundation is therefore's ,
[7'-8" + 2"(sand and asphalt) + 1/4 inch steel plate + 1' concrete] !
= 8. 85 feet. Subtracting 8.85 ft. from 892.92 ~ feet gives an elevation .-
of 884.07 feet.
Robert and Company (see Attachment A) has determined-from the original boring . log that, at 884 feet, the . containment building- a structure rests on partially decomposed rock which should support a -
pressure bearing of 10,000 PSF. .;
Additionally, the floor foundation rests on a concrete ring 1.5; foot thick,, excavated 11.59 feet deep through the bedrock foundation.
~
j This concrete ring rests on hard Gray. Gneiss rock at.an elevation of f 872.5 feet from sea level. .(See Drawing #2.and' Attachment A,JTest-Boring Record). The ring. forms an upside'down cup filled.with rock "
formation so that motion in any direction is not possible.
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n i Tsles: $42507 GTRIOCAAtt : Fax:404 853-9325 (Venfy 404 894 3000)
- A Urut of the Unwersity System of Georo:a .. An Eaual Education ana Emolovment Opportisuty institutron .
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Mr. Douglas M. Collins October 22, 1993 Page 2 Conclusion. The sewer problems in Atlanta may cause some surface ,
or near surface, loose dirt to move from on place to another. .This may impact some structures if the foundations of these structures are not anchored to bedrock. The Containment Building of the Neely Nuclear Research Center is firmly anchored ' and. Its integrity 'is assured under any scenario of sewer collapse.
I am also enclosing a report addressed to me by Dr. Rodney D. Ice for additional information. Please consider this letter as an interim report. We are continuing to evaluate what other steps might be l needed.
I Should you have any questions, please let me know.
Sincerely, 0 & Woh w ,
R.A. Karam, Ph.D., Director Neely Nuclear Research Center RAK/ccg i
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inna Gwpa 3mS &m so;wcx us: m nmre October 4,1993 LMr. Donald Alexander Manager Facilities Engineering j1 Plant Operations Division E Georgia Institute of Technology
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~RE: Nuclear Reactor Building ,
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Dear Mr. Alexander:
Per the discussion with you on October 1,1993, We understand that there is an existing 72" diameter
- tt.dcrground storm sewer line runs through the northwestem comer of the building and you are concemed .:
about the safety of the reactor if the storm sewer should collapse. M By examining the original building drawings and specifications prepared by Robert and Company in 1960L under job number 5816, we have determined that the reactor structure is supported on'a 8 foot thick reinforced concrete circular mat and is independent of the rest of the building structure.' The bottom of the . '
. reactor foundation mat is at elevation of 884.00 ft, which puts it in the range of soft weathen:d rock or.
partially decomposed rock as indicated by borings #1 through #4 of the original boring log. This should *
- have allowable bearing pressure of 10,000 psf as the foundation was originally designed for.
The reactor and its foundation mat have gone through more than a quaner of century's rigorous test and- Q
- should remain structurally sound as long as the underlaying bearing rock remains unchanged.' l
.We, as structural engineers, can not predict what effect on the bearing rock would be in the event of the ; j collapse of th'e storm sewer, It is a job of the soils engineer. _We suggest that.you contact a qualified soils'- 'i engineer regarding this matter.. But the reactor structure should not be damaged even if the building L 4 adjacent to it should collapse, since they are separated by an expansion joint, not physically attached to ? y each other. :l It is premature for us to do any further investigation at this time, but we will be glad to help if We know-what kind of soil condition that we will be dealing with, We hope this will relieve some of your concern. ;;
if you have any questions concerning the above, please call. l
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.i Sincerely, '
! ROB RT AND COMPANY: l j i
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Arthur C. Koo .
~ Assistant Vice President 1 Stmetural Department 04 E Jcc: Mike Kluttz d
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P b P e D ATTACHMENT B l 1 I l i j 1 i l l l
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MEMORANDUM Oct. 13, 1993 TO: R.A. KARAM, Ph.D. Director, Neely Nuclear Resea.tch Center FROM: R.D. ICE, Ph.D.[ Eoard Certified Health Physicist Manager, Office of' Radiation Safety RE: NRC information request regarding GTRR and potential sinkhole The nearest storm dralnage sewer to the nuclear reactor is located in the North parking lot of Neely Nuclear Research Center (NNEC). The sewer line bends SW and goes underneath the NW corner of the laboratory support facility. At its nearest point, the sewer line is over 110 feet from the nuclear reactor and 70 feet from the nuclear reactor containment facility. The storm sewer is 72 inches in diameter and is made of concrete-pipe. This ir a tributary sewer line that IM follows the natural drainage contours of the surface The sewer runs roughly 1200 feet east of Atlantic Drive to a trunk sewer which lies in the low land west of the I-75/85 Expressway. The reactor containment building is a cylindrical 7/16" steel tank having an 82' diameter and a torispherical dome rising about 50 feet above ground level. The sides of the tank are lined with 12" concrete. It has been designed as a leak tight barrier to prevent any escape of gas or fission products. It has a flat bottom which rests upon 12 inches of concrete. Above the 12 inches of concrete is a two inch layer of sand followed by a steel plate that forms the base of the containment facility. Above the steel plate is 7 foot, 8 inches of concrete. This thick slab serves two purposes; it provides ballast against the buoyant force of ground water; and it supports the remainder of the interior building structure , including the reactor. The top of this slab is the basement Iloor There have been no significant watershed changes f or the past 30 years around the facility. Ground level approximates the first floor level of the reactor containment building. The ground tapers of f f rom south to north about 20 f eet ef f ectively draining the area around the containment facility to the tributary - storm sewer located in the North parking lot. The top of the tributary storm sewer is one or two feet below the bottom level of the reactor containment. The recent catastrophic City of Atlanta sinkhole, 1 approximately a mile away. was associated w2 th the collapse of the major sewer trunk line, not the tributary sewer line that serves Neely Nuclear Research Center. As a result of the collapse, a u .)
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v rainwater back flow situation ' developed in the tributary sewer i line, leading to flooding o.f the North parking lot. This flooding- ' was .the result of an acute trunk line incident and is not-indicative of problem with the tributary : sewer line that serves. , NNRC. a Seismic. history for Atlanta was reviewed in the Preliminary Safety Analysis Report developed prior to building'the nuclear. , reactor. In summaryr Atlanta was noted to be one of -the more a favorable nuclear reactor sites in the U.S. .In March 1993,. Law' Engineering did a specific assessment of seismic hazards :for-Georgia Institute of Technology. They reviewed seismic history, performed probabilisitic and deterministic seismic ground. motion , studies and made estimates of potential ground motion. The' report validated Standard Building Code seismic coefficient requirements in general and recommended specific seismic coefficients for-Georgia Institute of Technology. Robert and Company (Attachment One, dated Oct. 4, 1993), has I reviewed the original nuclear reactor building . drawings, test zi ground borings and building specifications regarding a potential ! storm sewer collapse. The test ground borings beneath the nuclear reactor containment building Indicate rock a t- an approximate elevation of 884 ieet (above sea level).. Review of construction' l diagrams (Attachment Two), indicate that the finished ground' floor of the reactor containment building is at 892.92' feet. When the 8-foot, 10" pad (Concrete / steel / sand base) is subtracted from'the ground floor elevation, it is evident that the entire pad is. [ setting on rock. Based upon the location of'the test borings, it. '; is also evident that the building contractors had to remove some : rock to provide a level base for the containment facility. ' Review of engineering diagrams for the containment' facility i foun6ation (Attachment No. 3) indicate further building support. j Around- the edge of the containment facility are additional-reinf orced concrete pads. =l These pads.are 42" inches thick and ; penetrate deep into the rock. The tops of the pads are at an ~ l elevation of 876 feet. : i.
Conclusions:
't
\
- 1. The recent nearbyLsinkhole was an acute problem on.a City. ;
of Atlanta major sewer trunk line and not a problem with the. : tributary storm sewer line servicing Neely Nuclear Research Center. 3 i
- 2. Topography of the f acility provides for adequate drainage. l of the center.
- 3. The nuclear reactor containment f acility foundation is on-bedrock and is anchored by additional footings into bedrock around )
the edges.
/
- 4. Containment. vessel integrity would be maintained-in any catastrophi-c event. .
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4 REFERENCES
- 1. Meeting of Oct . 1,.1993 with Jim DePriest, Don Alexander, Brad Satterfield, Ratib Karam and Rod Ice.
- 2. PSAR, Safeguards Report for the Georgia Tech Research Reactor, January, 1960.
- 3. Law Engineering, Seismic liazard Study, GIT, March 1993.
4 '. Robert and Company,' Letter dated Oct. 4; 1993 ( Attachment No. 1)
- 5. Construction Diagram showing cross-section of containment facility " Typical Containment Shell Section" (Attachment No. 2).
- 6. Construction Diagram showing containment facility footings,.
Section 1-3 (Attacnment No. 3). c:\ admin \ sinkhole i 1
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