ML19210B238
| ML19210B238 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/27/1973 |
| From: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | John Miller METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7911040187 | |
| Download: ML19210B238 (3) | |
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Docket No. 50-289 SEP 3 71773 Metropolitan Edison Company ATTN:
Mr. Jahn G. Miller Vic, President P. O. Box 542 Reading, Pennsylvania Centlemen:
In July, it was reported to us that inspection data taken during ne pre-stressing of the vertical tendons of the Three Mile Island, Unit I., reactor building indicated that some tendon bearing plates had recessed into the concrete. Such recession could, of course, be indicative of significant voids in the underlying concrete. While we avaited your investigation of this matter, we urged you in our August 17, 1973 letter, to obtain direct verification that there were no significant voids. We were aware that the tendon stressing crev was on the site at that time, which would facilitate bearing plate removal and restoration.
On August 29, 1973, memoers of the Atomic Energy Commission's staff visited the site to inspect the subject bearing plates and discuss the n:atter with your staff. As a consequence of that meeting, you submitted a special report, dated September 6, 1973, in which you argued, in summary, that:
1.
The design of the concrete and its reinforcements is not deficient.
2.
The procedures used to pour the concrete were well planned and controlled.
3.
The measurements in question were intended as a safety control, not to measure recession.
4.
The technique used to take these measurements was faulty and the
,.3 resulting data, especially for the early measurements on the pf
.O vertical tendons, is not reliable.
g tv 5.
Although physical inspection is confused by subsequent bushhammering*
of the concrete, there is no evidence of any recession by the bearin'g plates having occurred.
Based on the information available to us now, we do not believe that the h
bearing plates have recessed significantly and we expect that the concrete beneath the bearing plates is without significant voids. However, we cannot x7243/L:PWR-4 RO As:TR L:PWR-4,,,,
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!ictropolitan Edison Company let the matter rest there because of the number of plants, including y% r own, in which there have been serious problems with concrete quality.
Therefore, to provide a conclusive demonstration of the correctness of the analysee made to date, we will require the removal of at least two of the upper bearing plates for the vertical tendons to permit inspection of the concrete beneath. We recom:nend the bearing plates for tendons V-79 and V-105 for removal. Please notify the regional office of the Atomic Energy Commission's Regulatory Operations of your intent ar.d schedule prior to removing the bearing plates.
Sincerely.
0%' Serned ey K. R. conee R. C. DeYoung, Assistant Director for Pressurized Water Reactors Directorato of Licensing cc: lir. Gerald Charnoff Shaw, Pittman, Potts
& Trowbridge 910 - 17th Street, N. W.
Washington, D. C.
20006
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20006 P. O. Box 2063 Harrisburg, Pennsylvania 17105 General Public Utilities Service Corporation ATTN Mr. R. W. Howard DISTRIBUTION:
Project Manager Docket 260 Cherry Hill Road PWR-4 Rdg Parsippany, New Jersey 07054 AEC PDR Local PDR General Public Utilities Service RCDeYoung Corporation JHendrie ATTN Mr. T. M. Crimmins, Jr.
OGC Safety and Licensing Manager NDube (w/3 encis) 260 Cherry Hill Road ASchwence.
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Weldon Arehart, Chairman EIGoulbourne (2)
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Londonberry Township RFD #1 Middletown, Pennsylvania 17057 C. Robert Budd, Chairman Board of County Commissioners of Dauphin County Dauphin County Courthouse P. O. Box 1295 Harrisburg, Pennsylvania 17108 Pennsylvania Electric Company Vice President, Technical N
1001 Broad Street Johnstown, Pennsylvania 15907 Mr. R. A. Heiss, Cordinator (W/o enc 1)
Pennsylvania State Clearinghouse Governor's Office of State Planning and Development P. O. Box 1323 Harrisburg, Pennsylvania 17120 l585 055 4
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