ML19332B095
| ML19332B095 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 08/08/1980 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | |
| Shared Package | |
| ML19332B093 | List: |
| References | |
| 50-458-80-07, 50-458-80-7, NUDOCS 8009250395 | |
| Download: ML19332B095 (2) | |
Text
b v
Docket No. 50-458/80-07 APPENDIX B NOTICE OF DEVIATION Based on the results of the NRC inspection conducted July 15-18, 1980, it appears that certain of your activities were not conducted in conformance with your commitments to the Commission and with the standard industry practice for the placement of concrete as indicated below:
A.
Hot Weather Concreting The River Bend PSAR, in Section 3.8.4.6, requires that workmanship conform to ACI 305-72, " Recommended Practice for Hot Weather Concreting."
1.
ACl 305-72, paragraph 5.2, " Inspection," states that, " Inspectors thould record at frequent intervals air temperature, concrete temperature, general weather conditions, wind velocity, and relative humidity.
The record should include frequent checks on temperatures of concrete as delivered and after placing in the forms, and obser-vations on the performance and appearance of the concrete as delivered and after placing in the forms."
Contrary to the above:
The inspection record for concrete placement No. ET-15-94-J6-1 did not contain the wind velocity, relative humidity, temperature of the concrete as placed, nor the observations on the performance and appearance of the concrete as placed. Ambient air temperature varied from 98 to 101 degrees F at the time of placement.
2.
ACI 305-72, paragraph 4.2.4.1, states that, "Whatever temperature limitation is considered worthwhile can be maintained to best advantage if mixers, belts, pump lines, and chutes are shaded.
Pump lines and other surfaces can be kept appreciably cooler by covering them with damp burlap, kept damp with a soaker hose."
Contrary to the above:
Placement No. Er-15-W-94J6-1 was accomplished by pumping via an exposed and unprotected rigid pipeline approximately 300 feet long.
Ambient air temperature varied from 98 to 101 degrees F.
This is a deviation.
B.
Concrete Placement The River Bend PSAR, in Section 3.8.4.6, requires that workmanship conform to ACI 304-59 (sic-73), " Recommended Practice for Measuring, Mixing, Trans-porting, and Placing Concrete."
B009250 M b
ACI 304-73, Chapter 9, " Pumping Concrete," paragraph 9.7, " Field Control,"
states that, "For pumped concrete, it frequently is desirable to sample at both the point of delivery to the pump and the point of discharge from the line and perform correlation testing to determine if any siginificant changes in slump, air content, and other mix characteristics are occurring.
i If significant changes are found to be occurring, appropriate allowance should be made for them."
I Contrary to the above:
l During placement No. ET-15-V-94J6-1, the IE inspector observed a significant loss of slump which caused plugging of the pipeline.
It was verified that no sampling was performed at the discharge of the pipeline and that appro-priate allowances for increasing the slump at the line discharge were not considered or initiated.
This is a deviation.
2