ML19308D779
| ML19308D779 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 09/27/1974 |
| From: | Maccary R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Grier B US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8003130824 | |
| Download: ML19308D779 (3) | |
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EVALUATION OF' CONSTRUCTION DEFICIENCY REPORT CONCERNIflG CONCRETE SiltENGTHS IN THE DOME OF THE CONTAIfMENT.
CRYSTAL RIVER, UNIT 3, DOCKETS 0-302(TAR-1047)
Branch and Coonizant Engineer Raouesting Assistance: Technical Assistance Branch, J. B. I!enderson -
Requested Completien Date: None Technical Review Branches Involved: Struct. ural Engineering Branch Dascripton of Regest; ha to F. Schroeder datad August i,1974 (tan-1047)
Review Status:. Coc.plete
- 17. acbordance with your request, the Str.:ct::rd Encineerine Branch, Directarote ::f Licensing, has reviewed the facts s5rroundide +he Goostruct'% Deficiency Recort which resulted fmn low 8-f.iv concrete strengths for a portica of concreta placed in the cce ac Crystal River, Unit 3.- W fcund that tr!th additfor.al infcrtutica provided lay telephone.from Mr. J. Henderson ana Mr. L. Geratan of RO tha con ~ crete as placed has within S0-days reached the specified design strength.~ The delayed strength gain vili have no detrimental effects on the safe *y mrgins providad for in the containrent.
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W therefore conclude that this issh has been satisfactorily resolved.
A surmary ofefacts related to this issue are' attached in the. enclosure.
Ach of jthe concern in this situation mold have been eliminated if f7.tho constmetor and quality contro1 group:had. followe'd, the SAR.
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': 1 conmittment;.instaad ofiallowing' the deviation.of earlyitesting of' 3 ~. 4the 9(Fday:.cy:linders.' 2 - J.;~~ ' T.S " v Hn ~; % ?.
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FACT SU:'."ARY CRYSTAL RIVER, U? LIT 3 L
LO'J STREi!GTH C0tl CRETE
- 1.. Concrete ' design strength was to be 5000 psi at 23 days.
2.
Concrete placement L-9. in the doce consisting of 129 cubic yards was comp 1eted 4/4/74.
3.
Low 7-day strengths were found based on previous data which l
' indicated that 28-day strength would not be met.
4.
Low 14-day strength were also found.
5..
The 28-day strength average was 4570 psi.
6.
The SAR (p. 5-14) required a set of test cylinders was to l
contain-2 tur testing at 7-days, 2 at 23-days and 2 at 90-days, however the 90-day cylinders were apparently used in attempting to raise the average when it was apparent the 7-day strength was low.
7.
Cause was found to be that ce. Tent did not meet specifications, apparently due to the grind not being fine enough.
8.
Concrete cores were then taken feca the dome e m of the L-9 j
placement.
9.
The 90-days cores ranged frca 5783 to 5520 psi,.-; ell chove the F
5000 psi minimum. The low rate of strength gain is in all 1
probability related directly to the larger than pecified
[ particle size, reducing the surface area availabTe for bydration.
This would then lengtcen the time for the concrece to achieve
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its design strength.
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