ML19347C286
| ML19347C286 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 10/03/1980 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Marshall W AFFILIATION NOT ASSIGNED |
| References | |
| NUDOCS 8010170210 | |
| Download: ML19347C286 (1) | |
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NUCLEAR REGULATORY COMMISSION g(
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l Mr. Wendell H. Marshall Route 10 l
Midland, Michigan 48640 l
Dear Mr. Marshall:
l My letter to you of July 9,1980 discussed a position taken by the NRC staff regarding the frequency at which correlation strength test sampling should be performed at the Midland Nuclear Plant as new safety related concrete is being placed.
In that letter, I noted that the applicant would submit a reply i
to our request 421.7 in July 1980, and that a copy of that reply would be for-warded to you once received.
Enclosed is the applicant's reply of July 14, 1980. The reply is consistent with our position and includes a clarification which we find acceptable regard-ing pours of less than 100 cubic yards once a week.
The reply concludes this matter to our satisfaction.
Sincerely, I
l A. Schwencer, Acting Chief Licensing Branch No. 3 Division of Licensing
Enclosure:
As stated i
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As of March 11, 1930, the central batch plant at the Midland jobaite was dis-
=antled and replaced by an off-site batch plant. :io safety-related structural cencre.e was prcduced at the off-site batch plant pending the amer.d=ent of the ccnstructica precedures to reflect the above-stated ccafo: cance with Section 6.11 cf A'!SI :Th5.2.5-1973, including the specified exception. 3ased upon cur under-ctanding cf the Staff's agree =ent vith the above-stated pcsition, concrete batching frc= the off-site tatch plant vill ;rceeed.
Wa
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require that each class of concrete has a companicn 9:000 mixture for use on.tonstruction icints buttering pump lines, and such otner a..:lications as shown on,:ne drawine.s.
As a.c.c ro.c r i a t e to the concrete mix, the crout mix is specifie' **
'a the Cencrete mix without the addition of coarse aggregate, leaving the cement, po::olan, sand (fine aggregate 3/3 iner or less', and admixtures in the same ratio as before and enough water to previde the desired censistency, but not exceeding the maximum water /(cement + po zolan) ratio established for the concrete mix.
Since this will produce a grout at least as strong as its companion concrete (due to the high cement content per cubic yard), testing of all the materials used in canufacturing grout is done as part of the concrete in-process testing program, and this accomelishes satisfactorv c.uali:v control cf the cr0ut.
For grouts with a higher cement-sand ratio than the c:rresponding concrete mix, ccepressive strength is established and tested in accercan;e with ASTM C 109-75, Standard Test for Compressive Strength of Cement Mortars.
3.8.1.6.1.2.2 Ba t ching, M i x inc., and Trans.ecrtinc.
Fine and coarse a c. rec. ate is delivered to the batch clant in v
accordance with the recommendations of ACI 304.
The free m isture content of aggregates is determined in accordance with ASTM C 566, Test for Total Meisture Content cf Aggregate by Drying.
Occassionally, ASTM C 70, Test for Surface Meisture ir Fine Aggregate, is used to adjust the amoun Of added mixing water.
The measurement of all sclid materials, a c. c. r e c. a t e s, cement, l
ao::olan, and powdered admixtures is by weight.
Water and lic.uid e
i admixtures are measured bv weight or volume.
The measurine. of all materials is in accordance with the tolerances specified in
.n.e.o.
C 9,,.
The batch plant is tested and certified in accordance with National Re'.d.v Mixed Concrete Association (NRM C A ) requirements bv.
a qualified independent agency, prior to concrete production and thereafter (for work prior to April 1, 1977) every 25,000 CY of concrete produced or every 6 months, whichever comes first.
After April 1, 1977, the batch plant is inspected every 6 months to ASTM C 94-72, Standard Specification for Ready Mixed Concrete.
Between March 14, 1980, and June 24, 1950, no Category I concrete was produced.
After June 24, 1980, the applicable standard for i
inspection is ASTM C 94-73a.
The frequency of inspection is everv 6 months.
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