TNAG-1658-FCO40-2306-Daya-Bay-nuclear-power-station-project-safety-concerns-in-Ho-1987 — Page 87

1987-11-04 18:18

LIN

GNPJVC SHENZHEN

65709

P.12

3

ric

(6) There are photographic records of the placement of horizontal bare in various sample parts of the outer segmenta of the raft, The photographs confirm that, for these samples, bars of all types are aorrectly installed. Furthermore, quality control records also show sample checks at several stages and also confirm correct apacing and locations, These samples include a 100% check of 3 layers of bars in опе complete 90 degree outer segment (one of the four outer segments). In this casa the 100% check covers the correct number, location and diameter of bars.

@quivalent

The photographe and QC records are

to taking a complete "wedge" or "slice" of the first layer

of the first layer and re-confirming by two separate methods that 100% of the bars in the sample are installed in the correct locations,

(7) The raft im

@ymmetrical atructure where the reinforcement in the outer layers 1.8 * pattern which ia repeated around the circumference. In addition to the

the quality control sample checks referred to in (6), there are records of further checks by JVC on the uniformity of the reinforcement patterns. These are 100% checks that pattera of all types of bar in all the outer segments is repeated consistently all round the circumference.

In the case of the non-conformance, a single error was systematically repeated around the periphery. Similarly, however, for all other types of bar it is concluded that the correct placing was systematically repeated.

apart from

The foregoing gives full confidence that,

the non-conforming starter bars and the minor discrepancies noted in the vertical bars, the drawings were interpreted correctly and a high standard of installation achieved. The minor discrepancies in the vertical bars have been approved by the designer (in most cases they are additional baza) and it is concluded that, apart from the inclined starter bare, the first layer ie fully acceptable.

These conclusions, as noted earlier, have been reviewed and re-confirmed in two independent ways !

(1) An audit by JVC'a QA Department.

(2) A review

review by EdF and confirmation from 2d7's senior management that JVC's intent to accept the first layer is entirely in accordance with the decision EdF would take under such circumstances for their own projects.

Consequently, JVC General Management is fully satisfied with the first layer as described here.