ML19347E163
| ML19347E163 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 03/02/1981 |
| From: | Draper E GULF STATES UTILITIES CO. |
| To: | Seidle W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| Shared Package | |
| ML19347E159 | List: |
| References | |
| RBG-9799, NUDOCS 8104240155 | |
| Download: ML19347E163 (5) | |
Text
,
u GULF STATES UTILITIES COMPANY POST oaPt CE Box 29S1 5 EAU M oNT.
TExA s 777o4 A REA COOE 71 3 638 663*
March 2, 1981 RBC-9799 File Nos. G9.5 G15.4.1 Mr. W. C. Seidle, Chief Reactor Construction & Engineering Support Branch U. S. Nuclear Regulatory Co= mission Region IV Office of Inspection &
Enforcement 611 Ryan Plaza, Suite 1000 Arlington, TX 76011
Dear Mr. Seidle:
River Bend Station Unit 1 Refer to: RIV Cocket No. 50-458/ Report 80-13 1
This letter responds to the infraction contained in your I&E Report No. 50-458/80-13, as required by 10CFR 2.201.
This inspection of River Bend Construction l
activities was perfor=ed by Mr. A. B. Beach during the months of November and December, 1980.
1 It is requested that the time allowed for responding to any future Notices of Violation be related to the date that Gulf States Utilities receives the Notice and not related to the date of the Notice.
In this manner, Gulf States Utilities 0
will be allowed full benefit of the response time.
0V 3 i
s.$ ' d g We trust that the enclosed response satisfactorily answers the concerns raised
/f in your report. We shall be glad to discuss any further points that you may h"Ve-J'(
j,1 S incerely,
{$.
N--
E. L. Draper Vice President-Nuclear Technology ELD /RJK/jm Enclosure h'lO4 240l l
UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION STATE OF LOUISIANA I
PARISH OF WEST FELICIANA I
In the matter of I
Docket Nos. 50-458' 50-459
-GULF STATES UTILITIES COMPANY l
(River Bend Station, 1
Units 1 and 2)
E. L. Draper, being duly sworn, states that he is a Vice President of Gulf States Utilities Company; that he is authorized on the part of said Company to sign and file with the Nuclear Regualtory Commi ssion the documents attached hereto; and that all such statements made and matters set forth therein are true and correct to the best of his knowledge, information, and belief.
I
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E. L. DRAPER Q
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j Subscribed and sworn to before me, a Notary Public in and for the State and Parish above named, this M day of M4/M)
, 1981.
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' Notary' Public 6 and for I
West Feliciana, Louisiana l
My Con:missica Expires:
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ENCLOSURE I NRC Finding 50-458/80-13 River Bend Station - Unit I Failure to Follow Procedures to Maintain Uniform Concrete Consistency at Point of Placement Criterion U of Appendix B to 10CFR50 requires.that activities affecting quality be prescribed by documented procedures of a type appropriate to the circumstances, and shall be accomplished in accordance with these procedures.
1.
Stone & Webster Construction Specification No. 210.370, Revision 5, " Placing Concrete and Reinforcing Steel," requires that concrete placements conform to the provisions of ACI 304 (73), " Measuring, Mixing, Transporting, and Placing Concrete." Section 9 states, " experience indicates that slumps below 2 inches are impractical for pumping."
2.
Stone & Webster Construction Specification No. 210.350, Revision 2, " Mixing and Delivering Concrete," requires, under " Delivery," that freshly mixed concrete shall be delivered to the point of placement in a thoroughly mixed, homogeneous condition, with uniform consistency from batch to batch.
3.
Stone & Webster Specification No. 210.361, Revision 1, " Concrete Testing Services," requires that, except for the required frequency (50 cubic yardsi, slump test of concrete in delivery mix trucks may be waived when adding wit.theid water, provided the amount of withheld water does not exceed that of a previously tested and accepted concrete load of the same mix and size, and having not had less than the same amount of withheld water added to similar concrete proportions.
Contrary to the above:
A review of records during the period November and December,1980, for Category I placements ABS-W-83B4, AB4-W-93B5, AB5-W-83B3, ET20-S-67S2, and RB3-W-80 indicates procedures were not followed in that:
1.
Slumps as low as 1-1/4" were pumped.
2.
Subsequent batches were not adjusted to increase.the slump and provide uniform consistency.
3.
A review of the records during November and December, 1980, for Category I concrete placements CB7-W-115J2, SC4-W-859, RB3-W-80, FB3-W-90, CB7-W-11556, and CB7-W-11552 indicates that the slump tests were not being performed in accordance with the frequency required when withheld water added exceeded that of a previously tested load.
o.
ENCLOSURE I NRC Finding 80-13 RBS-Unit 1 Page 2 of 3 COMMENTS:
Stone & Webster has taken corrective action in numerous areas of concrete production to ensure that variation in concrete consistency is. reduced.
Principal actions have included: Changing the cement grind.. reducing'the variation in concrete aggregate gradation, reducing' time of obtaining aggregate moisture content, increasing slump and air content of concrete, and reducing discharge time from truck mixers.
Stone & Webster Field Quality Control (FQC) has issued a report titled,'" Concrete Production Summary and Analysis", in which specific actions.in.the above areas-are outlined and methods for monitoring trends are displayed.
Stone & Webster believes that action previously taken, when combined with~
corrective steps listed in response to this audit, will effectively reduce concrete consistency variations.
CORRECTIVE STEPS WHICH HAVE BEEN TAKEN AND RESULTS ACHIEVED:
1.
Engineering and Design Coordination Report lk). P-1609 has been. issued to allow the use of a microwave oven to expedite performance.of concrete aggregate moisture content tests.
2.
The coarse aggregate stockpile sprinkling system has been refined to in:rease control of moisture content.
3.
E&DCR No. C-1966 has been issued to limit discharge of concrete to 50 minutes after batching or 300 revolutions of the truck mixers.
4.
Stone & Webster Quality Assurance Inspection Plan No. R1-210.370-F0507 has
~
been revised to delete the 1/2 gallon per cubic yard tolerance for water additions requiring performance of slump tests. S&U FQC has instructed all concrete inspectors to conform to specification requirements for frequency of performance of slump tests and FQC review of subsequent concrete placement inspection reports has verified. compliance to the instruction.
5.
S&W FQC has established a temporary test area at the batch plant, to assist the concrete supplier by providing bumediate results of the effects of batching changes on the concrete, in order that corrective action can be taken to ensure concrete consistency. This action will assist the batch plant operator in developing better judgement as to what concrete consistency is required to be batched, to provide optimum placeability at the point of placement.
ENCLOSURE I NRC Finding 80-13 RBS-Unit I Page 3 of 3
-CORRECTIVE STEPS WHICH WILL 3E TAIGN TO AVOID FURTHER VIOLATIONS:
1.
Stone & Webster will install moisture gauges in the batch plant fine aggregate bins, to provide continuous monitoring of moisture content.
2.
To minimize discharge time of concrete af ter batching, Stone & Webster Construction has been instructed to ensure roadways are open to provide concrete trucks ready access to placing equipment and to order less cubic yards of concrete per truck when placing rate is anticipated to.be reduced due to configuration of/or access to a particular concrete placement.
3.
S&W FQC is performing a time study of concrete delivery and discharge to determine if additional measures are required to expedite the discharge time of concrete from truck mixers.
DATE L EN FULL COMPLIANCE WILL BE ACHIEVED:
All instructions issued in writing and in full compliance as of March 1, 1981.
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