ML19262A488
| ML19262A488 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/01/1972 |
| From: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | John Miller METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7910300431 | |
| Download: ML19262A488 (3) | |
Text
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Distribution:
Local PDR Docket file' DRL Reading PWR-2 Docket No. 50-289 HR RCDEYoung
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HSchierling DFRoss CO (2)
W tropolitan Edison Company AGluckmann Attn.
Mr. J. G. !! iller Vice President P.O. Box 542 Reading, Pennsylvania 19603 Gentlemen:
We have reviewed your report entitled " Containment Building Ring Cirder Construction and Repair", dated December 1,1971, and the addendum to the report, dated January 21, 1972.
Based on the information contained in these documents we have concluded that the repaired ring girder is capable of withstanding the design lands, which may be applied to the structure duting its life, provided special attention is given to the items listed in the enclosure.
We request that you provide a commitment to fully ic:plement the procedures outlined in the enclosure.
Sincerely, Original Signed BY R C.DeYoung R. C. DeYoung, Astoistant Director for Pressurized Water Reactors Division of Reactor Licensing Enclasure.
Repair & Surveillance Procedures for Containment Building Ring Cirder cc: w/ enc 1 Ceneral Public Utilities Service Corporation, R. W. Heward, Project Manager P.O. Box 1018, Reading, Pennsylvania l'3603 General Public Utilities Service Corporation, J. a. Thorpe, Safety and Licensing Manager, 260 Cherry Hill Road, Parsippany, New Jersey 07054 Shaw, Pittman, Potts, Trowbridge & Madden, Attn:
Mr. Gerald Charnoff, Esq.,
910 - 17th Street, NW, Washington, D. C.
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form AEC-310 (Rev.9-53) AECM 0240
- u s covtaNvtNT *NT'No ONE mo mor 7se 7910300 C/3/ A
6M r-REPAIR AND SURVE!LLANCE PRCCFDURES FOR COSTAINMENT EUILDING RING GIRDER THREE MILE ISLAND NUCLEAR STATION, UNIT 1 1.
Special attention should be given to quality assurance and quality control.
2.
Six samples of concrete-epoxy-concrete joints should be prepared and stored in environment similar to the cue obtaining in the ring girder. Three cf these samples should be tested for tensile and sherr strength af ter one year and three sa:ples af ter three years after initial start-up.
The tests should show that the epoxy joints have a strength better than or at least equivalent to the concrete strength.
The results of these tests should be referred to the Commission within 1C days.
3.
Install permanent structural provisions to facilitate access to the ring girder and dome area for the purpose of inservice inspecticns.
4.
Conduct gage readings and visual inspection during the prestressing operations, during the acceptance and leak tests and 6, 12, 24 and 36 months after the acceptance test.
These examinations should be perforced by competent inspectors and with the aim of uncovering evidence of structural distress.
Crack patterns should be recorded during each inspection.
During the acceptance test the precedure indicated in the AEC Safet, Guide alS should ce fellcwec and in acdition strain gage readings and visual inspection should be made as suggested in the referenced reports.
5.
Submit to the Commissien detailed reports of the results of the surveillance program within 10 days af ter the completion of those aspects of the prcgram scheduled to be conducted at prestressing, at acceptance test, and at 6, 12, 24 and 36 cenths after the initial containment leak rate test.
These reports will be usec f or the purpose of review and possible revision of the inservice surveillance pregram.
6.
If a final weather-proofing treatment of the top surface of the ring girder and of the dome is used, the insulating charreteristics of the weatber-prcofing material (to reduce the the.
gradients) as
.a well as its ability to accommodate development rud covement of cracks in the ccacrete surf ace of the dcte should be carefully developed and specified.
This weathar-prcofing should be such as to permit the visual inspection of concrete crack patterns.
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Paferences 1.
" Report on Containment Building Ring Girder Construction and Repair, Three Mile Island Nuclear Station, Unit No. 1",
Metropolitan Edison Co.pany, December 1, 1971.
2.
"Addendura to Report on Containment Building Ring Cirder Construction and Repair, Three Mile Island Neclear Station, Unit No.
1,"
Metropolitan Edison Company, January 21, 1972.
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