ML19312B702

Submits Changes to PSAR Per Engineering & Const Work Performed Subsequent to PSAR Submittal,Including Suppl 5

ML19312B702
Person / Time
Site:	Oconee
Issue date:	08/20/1968
From:	Willie Lee DUKE POWER CO.
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 7911180021
Download: ML19312B702 (3)

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Dear Dr Morris:

Reflecting our engineering and construction work subsequent to submittal of the PSAR, including Supplement No 5, we have found it necessary to correct and/or change the several areas as IIsted below. We believe that all changes will either not affect or will enhance the integrity and safety of the plant.

Section 5 - Containment System f_agg Paraaraoh jdag Summary of Chanaes 5-13 5.1.2.9 2

Delete last sentence referring to cooling coils in primary shield.

Cooling coils are omitted since study concluded that peak concrete temperature during normal operation is conservatively estimated at 138' which is well within the 150* limit for sustained temperature exposure to concrete.

50-15 4.2 Correction:

In third complete paragraph on the page, revise first sentence to read as follows: "In addition to the visual inspection, randomly selected splices shall be tenslie tested in accordance with the following schedule for each position, bar size and grade of bar:"

Insert new paragr.aph after third complete paragraph, as follows:

" Test spilces may be made by having test bars of 3 ft length spliced in sequence with the production bars.

In addition, two production splices will be cut out and tested for each 100 test splices."

This additional paragraph will eliminate the need for cutting out test splices from the production work and replacing them with two additional spilces while still maintaining actual on-site conditions, i

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.g Dr Peter A Morris Page 2 August 20, 1968 Pjtqg Paracraoh jdng Summary of Chanaes Our field experience with Cadweld splices through July 22, 1968, is sunnarized below in support of this change:

Total Total Sister Total Production Solices Solices Tested SoIIces Tested 3,040 80 13 Bar Size Specified Average Break and Grade Ultimate Stress Stress

1. 11 - AIS 70 KS1 78 KS1

1. 14S - A432 90 KSI 102.3 KS1

1. 185 - A432 90 KS1 97.4 KS1 98.9% of test splices exceed 125% yield with only one #14S splice falling below. This failure was in the bar 31" from end of Cadweld sleeve and occurred at a stress of 68 KS1 which is 113% yleId.

SE-1 3

8 Correction:

Change A442, Grade 55 to A516, Grade 60.

This change was made to facilitate ultrasonically testing plate.

SE-3 10 2

Correction:

Change ASTM A442 to ASTM A516 for the same reason.

Yours very truly, W S Lee WSL/s cc Mr William C Seidle Division of Compliance 230 Peachtree St, Suite 818 Atlanta, Georgia 30303 l

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