ML19276H266
| ML19276H266 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/17/1968 |
| From: | Moseley N US ATOMIC ENERGY COMMISSION (AEC) |
| To: | James O'Reilly US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7910160552 | |
| Download: ML19276H266 (2) | |
Text
.
r 3's December 17, 1968 J. P. O'Reilly, Chief, Rcactor Inspection & Enforcement Br.,
Division of Compliance, licadquarters INQUIRY MEMOPAliDUM IIEPROPOLITAN EDISON CCMPAN't, (TIIREE MILE ISLAND), 289/68-A CONCRETE VOIDS - TENDON GALLEY Mr. Vernon Steubner, Resident Engineer, Three Mile Island (Met-Ed) 1968, to report telephoned Region I at 10:00 a.m. on December 16, voids in the concrete of the tendon galley of the containment The pertinent facts obtained from Mr. Steubner are as building.
follows:
The concrete for the reactor base is essentially complete.
1.
When the forms were removed from two sections of the tendon 2.
galley, concrete voids were observed near three tendons.
The voids were caused by scrap wood and mud.
The mud came off 3.
The scrap wood was removed from this area.
with the concrete forms.
The area of the voids was chipped back to solid cone-nte.
4.
(Est. 5 - 10 cubic feet of void).
The maximum depth from the surface caused by the wood was 5.
approximately 12 inches - by the mud, 2 inches.
The inside of these three tendons conduit and several others 6.
was tapped in order to listen for indications of other voids The results indicated the rest of the concrete was sound.
Het Ed's analysis of the problem was that several pieces 7.
of scrap lumber, which were left behind when these two The mud was sections were cicaned, prevented a solid pour.
washed into the form by rain.
The wood and mud should have been removed but were not detected until the forms were removed.
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7 Inc., (UE&C) Construction United Engineers and Constructors,(GA), Ar,chitect-Engineer 8.
Manager, and Gilbert Associates to agree with Met-Ed's analysis and that thk remaining concr is sound.
E C, A procedure has been prepared and npproved by Met-Ed, and GA to repair the voids using epoxy coment, 9.
l and is One of the tendons was for the 90 wire tendon sys t
10.
not to be used.
tendon system.
ire Mot-Ed does not plan to repair the voids near the 170 wRe l
tendons until the middle of January, 1969.90 i
11.
l xy time permits in order to gain experience using the epo cement repair procedure.
d Region I is planning an inspection at Three Mile IslanM 12.
1969.
the week of January 6,
~15 the repair schedula should change.
~
I l
N. C. Moseley Senior Reactor Inspector E. G. Caso, DRS cct l
R. S. Boyd, DRL (2)
S. Lovine, DRL DRL (2) i l
D. J. Skovholt, L. Kornblith, Jr., CO l
REG files lllI
14i?
090 I
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