ML18025A281
| ML18025A281 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 02/17/1976 |
| From: | Curtis N Pennsylvania Power & Light Co |
| To: | Butler W Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18025A281 (5) | |
Text
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U.S. NUCLEAR REGULATORYCOM'ION NRC F M 19F.
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NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL DOCKET NU FILE NUMBER 8
38 TO:
Mr Butler GALETTE R
~[ORIGINAL OCOPY DESCRIPTION 0 NOTO R IZE D SUNCI ASSIFIED FROM:
PROP Penn Power
& Light Co Allentown, Pa N W Cuttis INPUT FORM ENCLOSURE
DATE OF DOCUMENT 2-17-76 DATE RECEIVED 2-20-76 NUMBER OF COPIES RECEIVED one signed Ltr furnishing info & proposed changes modifications to concrete requirements in ACX 318-71.....(
one cy rec'd)
DIST PER LPM MINOR 3-8-76 BONG".. B,ZMOVZ ACKN0%LEDGE'0 PLANT NAME:
Susqueahnna 1 & 2 S
PETY ASSIGNED AD:
BRANCH CHXEP:
FOR ACTION/INFORMATION ASSIGNED AD :
BRANCH CHIEF
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ENVIRO 3-8-76 eh f PROJECT MANAGER:
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ENG NEE KNIGHT SIHWEIL PAWLICKI INTERNALD ISTR I BUTION BENAROYA IPPOLITO OPERATXNG REACTORS STELLO ERNS BALLARD SPANGLER SXTE TECH GAMMILL STEPP HULMAN LPDR'IC NS ASLB NRC FORM 105 {2.7GI SERAI PROJECT MANAGEtIENT BOYD P.
COLLINS HOUSTON'ETERSON MELTZ
}IELTEMES SKOVHOLT REACTOR SAPETY ROSS NOVAK ROSZTOCZY CHECK AT & I SALTZtIAN RUTBERG EXTERNAL DISTRIBUTION NATL LAB REG, V"IE LA PDR CONSULTANTS OPERATING TECH EISENHUT SHAO BARR SCHWENCER GRIMES ANALYSIS DENTON & MULLFR BROOKHAVEN NATL LAB ULRXKSON(ORNL)
SITE ANALYSIS VOLlkIER BUNCH J ~ COLLINS KREGER CONTROL NUMBER
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O'PISTIL TWO NORTH NINTH STREET, ALLENTOWN, PA. 1810'I PHONE~ (215) 821-5151 Bicentennial February 17, 1976 REPu1at j Flte cy Sn)an chBhcn ann8 chdrchMnn Director of Nuclear Reactor Regulation Light Water Reactors Branch No. 1-2 U. S. Nuclear Regulatory Commission Washington, DC 20555 ll ATTENTION:
Walter R. Butler, Chief SUSQUEHANNA STEAM ELECTRIC STATION I MODIFICATIONS TO CONCRETE SPECIFICAT ER 100450 FILES 840-2, 15 PLA-104 Docket Nos.
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Dear Dr. Butler:
We are modifying certain concrete requirements in ACI 318-71 with the objective of improving our schedule and cost considerations while retaining a high level of construction quality.
We are submitting this change together with supporting justification for your review.
PROPOSED CHANGE 15'1:
The requirements of ACI 318-71, Paragraph 6.4.1. are modified as follows:
A.
The last sentence of this paragraph is deleted in its entirety and. the following shall be substituted.:
"vertical joints. shall be thoroughly wetted. immediately before placing of new concrete".
The purpose of this change is to delete the present ACI 318-71 Code statement requiring unnecessary cement coating of vertical construction joints.
The inclusion of this provision in the ACI 318-71 Code and'ther industry standards is intended to ensure adequate bond between existing concrete and. a new placement.
This method has been included in various industry specifications for many years as a standard procedure to ensure that there is adequate cement paste along the vertical face of a construction joint to bond the old concrete with the new.
We believe that this practice is unnecessary for the Susquehanna Project since the procedures employed on the Project ensure a vertical construction joint which is at least as good as, and in many cases is superior to, those made following the old. practice of co'ating with neat cement grout.
PENNSYLVANIA POWER 8
LIGHT COMPANY
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P PLA-104 Page 2
Our present procedures require that all vertical construction joints shall be roughened and. thoroughly wetted before placing of new concrete.
In addition, the placement is consolidated by mechanical vibrating equipment to ensure complete contact of the wet concrete with the face of the formed joint, so that the required. bond. will be developed between the two placements.
We have obtained. opinions from several experts in the field. of concrete design and construction and all of them support this procedure as the preferred method. of developing bond at vertical construction joints.
Among these are Mr. Lewis H. Tuthill-Concrete Engineering Consultant, Mr. Fritz Kramrisch-Chairman ACI 318 "C"-Subcommittee, Mr. Richard D. Gaynor-Vice President of Engineering and Research, National Ready Mixed Concrete Association.
We intend. to impelement this change on March 5, 1976.
This change will be submitted in a future PSAR Amendment.
If you have any questions regarding this
- change, please contact us.
Very truly yours, N.
W. Curtis Vice President-Engineering and Construction Sworn to and Subscribed. before me 976
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