ML19261F065
| ML19261F065 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/13/1972 |
| From: | US ATOMIC ENERGY COMMISSION (AEC) |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML19261F063 | List: |
| References | |
| NUDOCS 7910180679 | |
| Download: ML19261F065 (6) | |
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ENCLOSURE NO. 1 METROPOLITAN EDJSON C0"PANY - CENEPJ.L FUBLIC UTILITIES CORPORATION THREE "ILE ISLAND CIT 1 Sep tember 6, 1972 SU:! MARY The applicant briefly described tne preseat status of repairs on the south 180* of the ring girder. Questions by the staff regarding the ring girder repair were presanted verbally to the applicant and were discussed.
These questions had been prepared by A. Gluckmann, Structural Engineering Branch (See Enclosure No. 2), and were based on his revieu of "Addendua 3, Repert on Containcent Building Ring Girder Construction and Repair", dated August 23, 1972. We requested and the applicant agreed to address these questions in an addendum by September 22, 1972.
The TMI-l schedule and our list of outstanding items were discussed be tween J. Thorpe (GPU) and H. Schierling (Licensing, Project Manager).
DETAILS 1.
Regarding our proposed questions the applicant provided the following information:
Construction joints at nominal elevations 443 f t-0 in and a.
446 ft-9 in are being excavated.in those locations where a good aggregate interlock does not exist, in some instances up to 2 ft deep.
The location of the neu construction joints wtre shown in a sketch.
The final construction joint. a combination of existing and new joint, will provide suf ficient aggregate interleck such that the entire shear forces will be carried by friction in the concrete without relying on the rebar.
THe bursting forces behind the bearing plates for the tendons will be carried by the spirals behind the bearing plates. The shear forces due to an aircraft impact are small (102 kips per foot) when transmitted over the entire ring girder crossection.
However, the applicant was ut.able to specif ty the atresses at the point of impact.
b.
Detailed QC. documentation is being followed in all repair procedures.
Applicant provided us with a suenary of all uelds perforr.ed on the north 180* (See Enclosure No. 3 and RO Inspection Report No. 50-289/72-0S), indicating that no butt
- welds exist in that portion.
Repair of nick's in rebars was almost entirely eliminated since cost damaged rebar had been cut out.
When necessary nicks were repaired by cadwelding.
1486 184 7p 791073o
. c.
We told the applicant that we will require one consolidated report on the entire repair of the ring girder since there are numerous inconsistencies between the original report (December 1,1971) and the addenda 1 through 3 due to the additional information and evidence uncovered during the repair.
This report,houever, will not be required for the ACRS meeting scheduled for November 1972.
2.
S. Folsom (R0 Region I) showed some slides of the ongoing repair, in particular of highly congested rebar in some locations.
L. Beratan (RO) expressed concern since it appears difficult that in such locations concrete can be placed in a consolidated manner without voids.
J. Wright (GPU) described the detailed precautions taken during the pouring of concrete and stated that the concrete indeed would be consolidated in such conjested areas.
- Houever, K. Nodland (Gilbert Associates) did not rule out the possiblity of small voids. We reques ted
- 'ie appliccat to analyze the effect of small voids with regard to stress distribution.
The applicant stated that his present estimate for completion of the entire ring girder repair is January 15, 1973.
3.
Installation and Tensionin: of Tendons Tendon conduits have been repaired and tested for zero leakage at 10 psi for 10 minutes.
Applicant will be ready for installation and tensioning of vertical tendons on the north 1S0* in approximately 1 month.
Detailed procedures are presently prepared by Ryerson Company and evaluated by Gilbert Associates. We e:cpressed concern that tensioning on the north 180* only will unnecessarily impese a non,symetrical load on the entire containment building.
Since the repairs on the south 180* will not be completed at that time, additional damage might result. The applicant will inform us sufficiently in advance of any tensioning.
I85
E!!CLCSURE 50. 2 TIIREE : ILE ISLA'!D C'!IT S0. 1 RI:!G GIRDER REPAIRS PFJLI:!I:!MY LIST OF OUESTIONS FOR DISCCSSIO:: DURI::G "ECTI:!G CS Ser tember 6, 19 7 2 The filing by the apolicant of Addendum #3, dated August 23, 1972, to the previously filed:
Report on Centainment Building Ring Girder Construction and 1.
Repair, dated December 1, 1971.
2.
Addendum 1 to above, dated January 21, 1972.
3.
Letter tc A. Giambusso, dated ::ay 31, 1972.
4 Addendum 2 to above, dated June 30, 1972.
5.
Addendum 3 to above, dated August 23, 1972, raises the fcllowing questions which we would like to present verbally to the applicant during our scheduled meeting on Wednesday, September 6, 1972.
I.
Addendum #3; answer to question 5.25:
Present in a sketch the new joint arrangement.
a.
b.
Explain the procedure by which complete aggregate interlock of the at the joints will be achieved, considering that part existing joints, left in the structure af ter repairs, cannot be changed.
Justify the safety f actor of two quoted in the answer.
c.
d.
Justify the statement that shear bars do not carry additicnal stresses due to the " bursting" forces and " hole" effect.
e.
Explain the statenent, tha t the stresses due to the aircraft impact are low.
II.
Addendum '!3; answer to question 5.26:
a.
Justify the staterent that in the :: orth 180* of girder no welding of rebars has been used during repair operations.
1486 186
. Explain the meaning of the statement "cadwelding is expected b.
to be used almost exclusively f or the repairs" of the South 180*.
III. Present a suggestion as to the method to be followed for documenting the complete repair procedure for North and South parts of the girder, af ter the repair operations are terminated.
1486 187
ENCLOS URI: 3 lbtropolitan Edison Company Three lille Island Unit 1 Docket No. 50-2G9 RING GIRDER SlRetARY REPAIRS NORT11 180' Caduelds Date Cut-Out Butt Spiral
. Poured Pour No.
Cadwelds o r Re_ j ec.t Welds Replacements Core Iloles 2/16/72 R-335 134 12 6(3) 24 3
3/3 R-341 46 1
2(2) 4 3/8 R-345 251 3/20 R-353 266 32 3/27 R-358 53 3/29 R-359 76 10 3/29 R-360 172 13 21 4/4 R-36 3 54 1
3/23 R-355 286 20 3/2 R-340 134 12 3/18 1:-415 129 9
8/15 R-413 328 39 34 2
8/10 R-410 134 5
46 3
8/2 R-408 336 21 7/28 R-407 309 18 4
7/20 R-40 3 338 17 53 4
7/17 R-402 322 29 41 3
6/20 R-394 377 17 80 6
6/14 R-389 3S6 13 60 4
6/9 R-387 274 14 46 m
7/7 R-395 380 25 59 2
7/11 R-397 308 13 48 2
7/13 R-400 367 32 6/2 R-332 318 13 59 O
6/9 R-336 427 9
70 59 8
673
_2 9_
__ _.4 9_
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TOT.\\L
- NOTES:
(1)
Repair cut out to provide access for other work.
(2)
Repair cut out and replaced with full length bar.
(3)
Repair cut out and replaced with cadweld.
E:' CLOSURE 4
!!ctronolitan Edison Corgany-General Public Utilities Threc !!ile Island Unit 1
'o.
50-239 Docket c
Meeting - Sep tember 6,19 72 ATTE: DA::CE LIST
!!a t Ed - GPU J. Thorpe D. Reppert Z. Wrig:it R. Burns Gilbert Associates K. :iodland D. Krause United Enr,ineers & Constructors A. Titne AEC A. Glucknaan, L-SEB L. Shao, L-SEE L. Beratan, RO-HQ
]khh
)hh S. Folson, R0-I 11. Schierling, L-PWR-2