ML102910699
| ML102910699 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 01/23/2009 |
| From: | - No Known Affiliation |
| To: | Office of Information Services |
| References | |
| FOIA/PA-2010-0116 | |
| Download: ML102910699 (3) | |
Text
2.7 Inadequate Vibration during Pour D e
May identify additional perspective on this issue as RCA related efforts proceeds
==
Description:==
Concrete, especially low slump concrete, requires rigorous mechanical intervention in order to spread through the forms and move around tightly spaced reinforcement. Vibration helps remove excess entrapped air and water. However, excessive vibration could result in segregation of concrete constituents, while too little vibration could result in voids and aggregate pockets even when the concrete slump is within spec.
Data to be Collected and Analyzed:
(1)
Vibration inspection reports. A sample is provided in Exhibit 1.
(2)
Existence of voids and aggregate pockets. (Exhibit 2 and Willie Easman interview.)
(3)
Segregation of concrete constituents. (Exhibit 2)
(4)
Conduct interviews of former plant employees if available. (Exhibit 3)
Verified Refuting Evidence:
- 1. Adequate mechanical vibration provided. (Ex 1).
- 2. Visual and Petrographic observations show relatively dense matrix with air voids that do not appear excessive. (Ex. 2)
- 3. Although several NCRs addressed voids and aggregate pockets that required corrections and were repaired, they are more a manifestation of slump issues than vibration (See FM 2.3 and Easman interview)
Reviewed by: Dr. Avi Mor, 352-795-6486, ext 1030 -
P11 CR3 Team Office Verified Supporting Evidence:
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Concrete Sunooier:-
General Ccrntrc~to:
Lcc ation:
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vez", Col:St Cýý-rcrtc, Inc.
L~i~rt Assc
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J. A. J.nes FOUR: 729 RB Inspector:
-Date 1-73 SUDGRADE INSPECTION:1A JOINT PREPARATION:
OK FORMS:
Properly Coated Free From Holes Seams Tight Clean Proper Shoring &
Alignment Supports REI iF C02CE.;H;'3:
Proper Clearance []
Proper Support 5
Clean r-No. Tie Rods OK Location Tie Rods vzrieri EMBEDDED ITEMS: (List) rnnfnrm5-- fo dwri,..
ECUIP;MENT:
Al V. C:
I 11.k mAnn niern~vn1ns VIUPOLUl 0.IU I Zl 0,l, UI rQ LOIS 10 'ýW Frenuencv n1us Placement Equipmenz.
2 -
6" 'Whiteman Concrete Pumps and 1 - 5 yd. bucket Tremie Pipes - Number NA Size NA Location NA PLAC WENT:
Consolidation Procedure Mechanical Vibration Grouted Yes Time 12:30 -
12:-45 R-1 Location Lower Const. Jt.
Concrete -
Lift Depth 1 8Bi max.
Direction of Pour N to S; S to N.
REMARKS:
E~xceptions: None T-. 34 -3.4 FITT.STZURCH TE'T'.1.3 t,`3 'T r!ýY T. 1_____U.
REPO PROJ Concr Arch-i Gener Locati SUBGI JOINT It FORMI Pro Fre Sea C le Pro Ali EQUIP No.
Pla.
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ý7 Tre PLACE Con Gro Cor REMAR 1 -Fl 2 -F1
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AS A MUTUAL PROTECTION TO CLIENTS. THE PUBLIC AND OURSELVES.
ARE SUBMITTED AS THE CONFIDENTIAL PROPERTY OF CLIENTS.
AND A FOR PUBLICATION OF STATEMENTS, CONCLUSIONS OR EXTRACTS FROM OUR REPORTS IS RESERVED PENDINO OUR-VWRITTEN APPROVY REPORT of CONCRETE PLACEMENT MbQR
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WA 99'~
PRTED TO:
ECT:
ete Supplier:
Engineer:
al Contractor:
on:
FLORIDA POWER CORP.
CRYSTAL RIVER PLANT UNIT NO. 3 West Coast Concrete, Inc.
Gilbert Assoc., Inc.
J. A. Jones Pour # 362 R3 RADE INSPECTION: N/A PREPARATION: Hin. k SCM perly Coated e From Holes ims Tight
.an per Shoring & Supports gnment REINFORCEMENTS:
Proper Clearance []
Proper Support Clean No. Tie Rods OK Location Tie.Rods OK EME MENT:
& Size of Vibrators 3 - 9,500, 1 - 11,000 Freq
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rero 114l-7U,,34'lJ i
ALL REPORTS OR AEG
- 0o Report No.
AL..
Date 2-1-72 Date 1-26-72 tEDDED ITEMS: (List)
Conforms to drawings uency Plus Location N/A ocation N/A ur West to East rior to concrete placement.
BURGH TESTING LABORATORY.
/4I.,
~Th1W MAVG cement Equipment I - Whitney Concrete Pump loppers mie X=-
Number N/A Si'ze N/A MENT:
solidation Procedur W -%.
4 6A 174'k
.&4 e
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VA~a tf utel'4 NIA Time 18" Max.
N/A LI icrete - Lift Depth Direction of Po, JKS:
EXCEPTIONS:
Final cleanup.
This item corrected p:
orldo Power Corp.,
nne t..
orida Power Corp., EYrTi TL-Tompo-TL - W. T. Hurst,
WALEY,.P.E.
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