NOV 10 '87 12:05 TIBCOOU) HK GOVT
GUANGDONG NUCLEAR POWER JOINT VENTURE COMPANY LIMITED
Position of The Treatment of Non-conformance of Omitted Starter Rebars in First Layer of Unit 1 Raft in
Daya Bay Nuclear Power Station
Mr. Zan Yunlong, General Manager
3rd November, 1987
P.19
The main purpose of inviting the friends from the H.K. engineering and scientific sectors to visit the site today is to take this opportunity to give you an overall briefing of the position of the treatment of the non-conformance of the omitted starter rebars in the first layer of the Unit 1 Raft.
1.
The Cause of the Non-conformance and the Policy of Treatment
The placing of the reinforcing bare on the first layer of the Unit 1 Raft of the Daya Bay Nuclear Power Station started in July.
The pouring of the first concrete commenced on August 7. The concreting of the first layer the Raft completed September 11.
of
on
the
After the commencement of placing the reinforcing bars on second layer of the Raft, staff from JVC and HCCM found on 14 in and 15.09.87 that the spacing of the inclined starter bars
It was the first layer was not in accordance with the drawings. later determined that the effect was the omission of some of this type of bars, and the formal notification from BCCM was received on 17.9.87. Work on the Unit 1 Raft stopped, pending a full scale investigation of this non-conformance.
The investigation confirmed
confirmed that the omitted reba rs inclined starter rebars on the first layer of the Unit 1 Raft. The total inclined starter rebars should be 576, but actually 260 were placed, with 316 amitted, This non-conformance directly caused by
the misinterpretation of drawing by the
were
the
wa s
contractor.
The technical effect of this non-conformance is limited and be overcome. However, this non-conformance should not occurred at this early and relatively simple stage
can
ha ve
of
construction.
· 1
1