TNAG-1658-FCO40-2306-Daya-Bay-nuclear-power-station-project-safety-concerns-in-Ho-1987 — Page 57

J

NOV 10 87. 12:01 TIBCOOL) HK GOVT.

1987-11-04

18:31

GNPJVC SHENZHEN

“P.13′′

65709

P.03

Note on 255 Additional Bars

The checks

the installation of the vertical bars in the foregoing refers, and a further explanation is given as follows.

centre of the

raft and

The installation of vertical bars started in the progressed outwarde, There are two diameters of bar used, ie. 25 and

certain radius

32 mm. In general, one diameter is used up to a centre and then

and then there

there is a change to the several such changes over the full radius of the raft.

other diameter.

from the There are

от the

The inversions in diameter (ie. the use of 32 mm in place of 25 conversa) occurred mostly at the boundary between areas of 32 and 25 mm bars. In most cases 32 om bars were used where stricr interpretation drawings would allow 25 but in a few cases there was the converse. work progressed outwarde sone additional bara were prepared to compensate for the use of slightly more 32 mm bars than required in the inner area.

+

Ав

the work progressed outwards there was another situation arising where there were practical difficulties in fixing one particular shape of bar

bar in the location shown. on the drawings. Due to the limited space availabla there were 255 of these bare which could only be placed in 8 nearby location. However, to ensure strict compliance with the drawings, 255 replacement bars were made to a alightly different shape et the lower end which enable them to be put in the required place. Both the original bars and the new bars were installed by the contractor; thereby

thereby accounting for the net surplus of bars in the final installation.

Although these points have no consequence on the design, and although che contractor took reasonable practical action under the circumstances to follow the drawings, the details should have been reported to JVC at the time they occurred. This lack of reporting has since been corrected. EdF designers take no exception to the presence of these bars,

The

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