TNAG-1658-FCO40-2306-Daya-Bay-nuclear-power-station-project-safety-concerns-in-Ho-1987 — Page 86

1997-11-04 18:17

GNPJUC SHENZHEN

65709

P.11

2 -

The conclusions of the re-check of the first layer are as follows :

Preparation of Bars

(1) The preparation of bars (ie. the cutting and banding) takes place

the construction away from

area. It is performed against liste prepared from EdF information sheets and does not require the use of

of bars needed the design drawings to determine the number of bars

(thereby removing the possibility that the drawings may be misinterpreted at the number this stage). The details of the various types of bar and prepared are recorded On a "Rebar Delivery Order" which accompanies the bars to the constructión area. The bara themselves are "tagged" to enable them to be checked against the delivery orders.

(2)

and

For the first layer of the raft, the records from the preparation of

that the bara confirm

all bara Vere correctly cut

bent and

transferred to the construction 8188.

(3) After concrete placement the 316 omitted starter bara were located.

prepared for the first layar Were

No other bars which installed were found.

Installation of Vertical Bars

but not

(4) A11 the locations for each segment where vertical bars protrude from the raft (8,076 in Lotal) have been checked and, apart from the 316 omitted

bars, there are bars installed in all cases.

a few discrepancies as follows:

There

■

starter bars,

In a small number of cases the bar locations are from the precise coordinates on the drawings,

fav

ma

Away

In the outer arga of the raft there are 255 bars installed in addition to those shown on the drawings.

In 20 locations 32 ma bars have been used in place of 25 mm and in 6 locations 25 mm bars in place of 32 mm.

The

EdF designers have since reviewed the "as built" status and have confirmed that there is no consequence to the design.

A full explanation of the origin of these bars is given in the end of this appendix.

Installation of Horizontal Bars

(5) Thera

nota at

during the

adequate photographic records taken reinforcement of the central area of the raft to verify tha correct installation of 100% of the horizontal baza in this area. There is further verification from QC checks made both by HCCM and JVC.