ML19210A105
| ML19210A105 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/28/1978 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7910240824 | |
| Download: ML19210A105 (2) | |
Text
e s (3 (7E REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
DISTRIEUTION FOR INCOMING MATERIAL 50-289 REC: REID R W ORG: HEREEIN J G DOCDATE: 07/26/7S NRC METROPOL EDISON DATE RCVD: 06/02/7?
DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED SUDJECT:
LTR 1 ENCL 0 FURNISHING
SUMMARY
OF THE 1978 OTS6 INSVC INSPEC.
PLANT NAME:THREE MILE ISLAND - UNIT 1 REVIEWER INITI AL:
XJM DISTRIBUTOR INITIAL.
- DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS *****************+
GENERnt DISTRIBUTION FOR AFTER ISSUANCE OF OPERATING LICENSE.
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FOR ACTION:
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POST OFFICE BOX 542 RE A DING, PENNSYLVANI A 19603 TELEPHONE 215 - 929-3601 July 28, 1978 GQI,1288 Director of Nuclear Reactor Regulations Attn:
R. W. Reid, Chief Operating Reactors Branch No. k U. S. Nuclear Regulatory Cc:=11ssion Washington, D. C.
20555
Dear Sir:
Three Mile Island Nuclear Station Unit 1 (T'4I-1)
Operating License No. DPR-50 Docket No. 50-289 OTSG Inservice Inspection Per a telephcne conversation between Mr. G. B. Zwetzig of your office and Mr. R. J. Stevens of Met-Ed, we are forwarding this sunmary of the 1978 OTSG Inservice Inspection.
Eddy Current exam _:.aticn was perfcmed on about 9% of the tubes (approx.
1,h20 tubes) in the 13 OTSG, and about 12% of the tubes (approx.1,900 tubes) in the 1A OTSG. The 12% inspection of the 1A OTSG resulted from a 9% initial inspection and a 3% additional inspection, as discussed below. The tubes selected for examination were derived frcm a modification of a 75 baseline inspectica program sugget ted by B&W to provide a more statistically repre-.
sentative sampling of the tube bundle. The tube inspection program concer-trated en the " tube lane" erea and the bundle periphery, based en failure histories at other E&W units.
The inspection results were as follows: A 65% through wall defect, classified as a manufacturing type, was found in OTSG 1A, Rev 1, Tube 16, at a pcsition approximately 3 inches above the 3rd Tube Support " late.
This tube was explosively plugged, and as a result of this defeat, the ad-ditional 3% inspection progran was ecmpleted. Cne tube on the 13 OISG (Rev 81, Tube 22) was explosively plugged as a preventive measure, because it was not cbvious whether or not a defect existed. No significpr g!gra a gn was noted in either OTSG.
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