Title:
【発明の名称】貯蔵状態の炉内構造物からの放射線を遮蔽する方法及び構造体
Document Type and Number:
Japanese Patent JP2977233
Kind Code:
B2
Abstract:
A cylindrical coffer dam assembly (30) is described for use in temporary shielding personnel from nuclear reactor stored internals' (14) radiation. The coffer dam (30) is made up of substantially equal segments (40) small enough to pass through the equipment hatch of the reactor containment building. The segments are pre-fabricated at a factory, transported to the plant, introduced individually into the containment building, and assembled together in sealing relation at the operating floor into a complete coffer dam. The coffer dam is moved to the reactor vessel and connected to the reactor vessel upper flange (22) in sealing relation. The coffer dam can be disconnected, disassembled, removed and re-used at other nuclear reactors.
Inventors:
FURANKU AAUIN BAUAA
ROBAATO SUTEIIBUN MABURETEITSUSHU
NOERU FUIRITSUPU GURIMU
ROBAATO SUTEIIBUN MABURETEITSUSHU
NOERU FUIRITSUPU GURIMU
Application Number:
JP15960290A
Publication Date:
November 15, 1999
Filing Date:
June 18, 1990
Export Citation:
Assignee:
UESUCHINGUHAUSU EREKUTORITSUKU CORP
International Classes:
G21C11/00; G21C1/02; G21C11/02; G21C13/00; G21C19/00; G21C19/02; G21C19/24; (IPC1-7): G21C11/02; G21C13/00; G21C19/02; G21C19/24
Domestic Patent References:
| JP60181688A | ||||
| JP5583891A |
Other References:
【文献】米国特許4654188(US,A)
【文献】米国特許4355790(US,A)
【文献】米国特許4299658(US,A)
【文献】欧州公開43394(EP,A1)
【文献】米国特許4355790(US,A)
【文献】米国特許4299658(US,A)
【文献】欧州公開43394(EP,A1)
Attorney, Agent or Firm:
Koichiro Kato (1 person outside)