ML19261F032
| ML19261F032 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/03/1972 |
| From: | Maccary R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7910180649 | |
| Download: ML19261F032 (3) | |
Text
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i Docket No. 50-289 I
R. C. DeYoung, Assistant Director for Pressurized Vater Reactors, L TAR - METROPOLITA.i 4DISON CNPANT, THREE MILE ISLAND NUCLEAR STATION UNIT fl. RING GIRDER REPAIRS, REQUEST FOR ADDITIONAL SUtUCTURAL INFORMATION The review of the Addendue f2, dated June 30, 1972, to the document entitled " Report on Containment Building Ring Girder Construction and Repair" filed on December 3,1972, has been completed by the Structural Engineering Branch, and we find that additional information is required. The additional information requested concerns structural design and construction aspects and is contained in the enclosure.
We require a response to this request for additional information by August 28, 1972, to m intain the current schedule.
R. R. Maccary, Assistant Director for Engineering Directorate of Licensing Raclosure:
Request for additional information for Three Mile Island #1 ring girder a.
Plant name: Three Mile Island #1 b.
Licensing stage: OL c.
Docket number: 50-289 d.
Branch and project manager requesting assistance: PWR #2, H. Schierling e.
Requested completion date: 9/15/72 f.
Technical Review branches involved: Structural Engineering Branch g.
Description of request: Review of repairs of the ring girder h.
Review Status: Additional information requested. Technical Assistance Request Number: L: TAR 30 (Partial) 1486 126 OmG >
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A. Gia=b us s o, L V. MacDonald, L ec v/ enclosure:
S. lianauer, DRTA J. iirndrie, L K. Kniel. L L. Shao, L ll. Schierling, L A. Gluck: nann, L 1486 127 i
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Form AEC-318 (Rev. 9-53) u.1 Fvtue8EM mMING omQ d ue-O-m '390
Docket No. 50-289 Metropolitan Edison Company Three Mile Island Nuclear Station, Unit #1 Structural Engineering Branch Request for Additional Infor=ation 1.
The Addendum #2 should '
sent, in addition to the four loading cases listed (normal operation, test concition, accident condition, initial prestress), the load combinations which include the OBE, D3E, airplane impact and tornado loads. A listing of mini =um safety factors in the repaired girder joints should be included. Where the shear bars are used to. carry also the bursting forces due to prestress and the tensile stress ceccentrations due to tendon curvature and the " hole" effect of flexible sheathing, the corresponding loads should be in-cluded in the analysis. The effects of shrinkage, creep of concrete, and relaxation of prestressing should be considered in all cases where they may modify the normal forces acting on the horizontal joints and therefore change the friction resistance of the joint.
2.
It has been previously agreed that welding of rebars will be accept-able only when the conditionn listed in Sections 7.0 (Butt Weld Splices),
8.0 (Reinforcing Steel Butt Weld Procedure), 9.0 (Nondestructive Testing of Butt Welded Rebar Joints) and 10.0 (Repair of Reinforcing Steel Mechanical Defects by Welding), of addendum #1, dated January 19, 1972, are satisfied. Indicate compliance with these conditions separately for the north part and the south part of the girder. Indicate the percentages of bars butt welded and/or repaired by welding scoarately for the north and south part of the girder.
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