ML20062E074
| ML20062E074 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 09/29/1978 |
| From: | Frazar R HOUSTON LIGHTING & POWER CO. |
| To: | Hubacek W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| Shared Package | |
| ML20062E072 | List: |
| References | |
| 781116, NUDOCS 7812040127 | |
| Download: ML20062E074 (2) | |
Text
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Iloustoa. Teus 77001 Mr. W. G. Ilubacek U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region IV 611 Ryan Pla za Drive, Suite 1000 Arlington, TX 76012 RE:
RESPONSE TO NKC INSPECTION FINDINGS SOUTil TEXAS PROJECT, UNITS 1 f, 2 DOCKET NO. S0-498/77-06, ST-HL-AE-201,
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DATED FL\\Y 23, 1977 j
SUBJECT:
UTILIZATION OF LEVEL I QC INSPECTORS FOR CONCRETE PREPLACEMENT AND PLACEMENT INSPECTION SOUTli TEXAS PROJECT ELECTRIC GENERATING STATION
Dear Mr. Ilubacek:
The purpose of this letter is to inform you of our plans relative to utilization of Level I QC Inspectors for concrete preplacement and placement inspection activities.
l We have re-evaluated our position as stated in our response to your audit of April 26-29, 1977 (Docket No. 50-498/77-06).
In October,19/7, we made an inquiry to the Joint ACI-ASME Committee on Concrete Pressure Components for Nuclear Service (SC-3C) for clarification of the Code intent.
A copy of our inquiry is attached.
To date, we have not received clarification from this committee.
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lie plan to begin using Level I QC Inspectors for quantitative inspections in accordance with the team concept as referenced in Appendix VII - 4100 of ACI 359 - ASME Section III, Division 2,
" Proposed Standard Code for Concrete Reactor Vessels and Containments."
These inspectors will receive training including written exaninations.
Level I QC Inspectors who have cet the qualification requirenents set forth in Appendix VII - 3311 and passed the examinations will perforn inspections and tests per Table VII-4100-1.
Level II QC Inspectors will continue to evaluate inspection and test results.
It is our intention to develop this progran as soon as possible, and to begin utilizing these Level I Inspectors as soon as they complete t raining.
'i81'20 401M
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l H re,'m i:j.t.nj & Poaer Compar:v Mr. W. G.lllubacek:
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Page 2 Septeaber 29, 1978 i
Level I-QC Inspectors will work under the direction of a certi-fied Level II QC Inspector, with no more than three Level I Inspectors-assigned to each Level II Inspector.
The following are exampics of quantitative inspections to be performed by Level I QC Inspectors:
Reinforcing Steel Inspection - checking for correct number, site, and spacing of bars; checking lap length, development length and concrete cover; and checking security of bars and projection of dowels.
Embed Inspection - checking for correct number, type, and
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location of embeds; checking for bent studs, clearance between embeds and rebar, and security of embeds; and '
checking type, location, and security of waterstop, 4
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Formwork Inspection - checking for cicanliness, mortar
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tightness, structural support, dimensions, and location
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of forms; checking type and spacing of form ties; checking j
1 for proper application of form release agents; and checking j
t location and size of chamfer strips.
i Construction Joint Inspections - checking preparation, sur-face moisture condition, location, and cleanliness of concrete construction joints.
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Tendon Sheathing Inspection - checking joint preparation and physical and weather protection.
Concrete Placing - checking setup of hoppers and tremies, placing of screeds, backup placement equipment, weather pro-tection provisions, mix design, rate of placement, vertical 4
drop and lift thickness; and checking the temperature of embedded items and forms.
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We trust that you will find this. position satisfactory. 'Should you require any further clarification or information, please advise.
Very truly yours,
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R. A. Fr ar, Manager Quality As3 trance Depar.tment RAF: j w Attachment cc:
Messrs. E. A. Turner H. L. Key
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