ML19210A236
| ML19210A236 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/29/1975 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| GQL-1553, NUDOCS 7910240949 | |
| Download: ML19210A236 (3) | |
Text
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LTR ME YO REPOR7 OYaEA
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POST OFFICE BOX 542 READING, PENNSYLVANI A 19603 TELEPHONE 215 - 929-3601 September 29, 1975 GQL 1553
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Dear Sir:
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V Docket No. 50-289 e
Operating License No. DPR-50 Three Mile Island Nuclear Statier Unit'l (TMI-1)
Pursuant to our letter of July 11, 1975, please be inf:rmed that as a result of analyses perfor ed on the rip rap of the dikes at TMI, the folleving deficiencies have been identified:
1.
In several areas the rip rap is s-al' - or thinner than criginally specified. To correct this situaticn, additional rip rap of the proper sice vill be placed in these areas.
2.
In one 225-fcot-long area just scuth of the Unit 2 intake structure the existence of a tce can net be verified due to the presence of a thick covering of spoil material.' To provide such verificaticn, a trench will be dug through the speil. If this excavatien reveals the presence of a tee, all spoil material covering the tce vill be re=cved; if it does not, a tce vill be placed.
3 In the area between the two intake structures and in ancther 250 rect-lens area just ncrth of the Unit 1 intake structure a tee prcbably dces not exist. To correct this situation, additicnal, coarse rip rap =aterial vill be placed at the base of the rip rap facing in these two areas to serve as a tee.
h.
In the area between the two intake structures and just ncrth cf the Unit 1 intake structure there is essentially no filter blanket present. This is net considered to represent a sericus situatien in that any a'diticnal d
rip rap which is placed en the facing to restore lost filter volume vill increase the thickness of the facing and thereby decrease the need for a filter; therefore, no attempt vill be made to replace the filter blanket in these areas except by the applicatien of additional rip rap to the dike facing.
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-2 All of the repairs mentioned in items 1 through h above are expected to be ecmpleted by the end of 1975, river ccnditions and other facters per=itting.
In the meantire, a region-by-regien analysis perfor=ed,by cur censultants indicates that the existing rip rap facing of the dike vill be cdequate to withstand design flev velocities and wave heights.
We trust this succittal is adequate; however, should you have any questiens regarding this matter, please do not hesitate to centact =e.
Sincerely,
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lR. C. Arnold Vice President RCA:JFV:tas File:
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