ML19261E912
| ML19261E912 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/13/1973 |
| From: | Beratan L US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7910170970 | |
| Download: ML19261E912 (3) | |
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SEP 13 $73 O
E. M. Howard, Chief, Raaetor Construction Branch, RO:1 THRU: G. W. Reiz.auth, Chf ef, Techniem1 Assistance Branch, RO HEETING AT THRIJ MILE ISLAND - MOVEMENT OF YERTICAL EZARING PLATES DOCKET NO. 50.'289 At the request of the licenmee a meeting was held at the plant sita on August 29, 1973 with representatives of the Directorate of Licensing (L), the Directorate of Regulatory Operations (RO), the 1teensee, the licensee's A&E, the constructor and a consultant from Pittsburgh Tasting Laboratories (PTL). The purpose of the meeting was to present all relevant information on tha vertical bearing piste movements to DL and RO and to allow thoes who wished to, to make a physical inspection of the affected bearing plates.
Mr. Artuso of PTL presented the results of his inspection. In essence, ha stated that from====ination of the concrete mortar which over lapped the bearing platas there were no signs of relative movement between the bearing plates and the concrete since none of the mortar was cracked. Also it was noted by Artuso that there was a tight joint between the edge of the bearing plate and the edjacent concrete.
These observations were made on the plates which the =ariman movements was reportad. It was his conclusion that the reported bearing plate movements did not taka place.
The licensee reported that the jig which held the dial gages were s
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attached to the jack by a magnetic fixture. In the cases where the readings were high (0.143 inches) it was stated that it was because the fixture had slipped. After approximately 10 vertical tendons had been insralled the dial gage fixture was valded to the jack and the gage readings indfestad significantly smaller deflections.
The inspectors made a physical inspection of the bearing plates. It was observed that the concrete had been bush-hammered.between the bearing plates and c,a one side ciretmaferentially around the done.
This was done to provide a depression in the concrete to promote drafnage away from the bearing plates. Because of the bush-hm===aring of the concrete around the bearing plates this inspector was not able to confirm Mr. Artuso's observations. As for the high dial readings which allegedly resulted from slippage of the magnetic fixture; the movements were recorded in the QC documentation and no nota was made
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SEP13 373 E, O Hrvard It was resolved that the licensee would subnit a report to DL in an attempt to provide assurances that movements experienced by the bearing
- plates are not vital to the safety of the containment and that there are no voids under the bearing plates. The licensee at this point declines to either remove any of the bearing plates, or to drill holes through the bearing plates to probe or use other means to provide assurances that there is full bearing under the plate and an absence of voids in the concrete.
0.ss:t !? ped ty LL L..
a L. L. Beratan Senior Structural Engineer Technical Assistance Branch, RO
Enclosure:
List of Attendees ces B. H. Grier, RO J. B. Henderson, RD H. D. Thornburg, 10 D
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L. C. Shao, L R. Shewmaker, L A. C. Clucicnann,, C 1483 202 omer >
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m EVALUATION OF TENDON BEAP.!NG PLATE INTEGRITY MEETING WEDNESDAY AUGUST, 29, 1973 ATTENDEES NAME COMPANY R.M. Bernero AEC A. Gluckman AEC L. Beratan AEC R.E. Shewmaker AEC Seth C. Folscm US AEC R0 I Law Narrow US AEC R0 I R.W. Heward Jr.
GPUSC J.H. Wright GPUSC R.H. Mason GPUSC W.T. Gunn GPUSC S. Levin GPUSC R.E. Meidig Jr.
GPUSC J.E. Wright GPUSC QC D. Tough GPU/GAI Dale D. Krause GAI Kaare E. Ncdland GAI D.K. Croneberger GAI J.F. Artuso PTE V.E. Cichocki UE&C Const./QA/QC Coord.
R.L. Hawkins UE&C Const./QA/QC Norman A. Vitale UE&C QC 1483 203
. rank ?. Long UESC QC D.H. Rappert GPUSC