Title:
METHOD FOR MONITORING ATTACHMENT ON INTERNAL WALL OF PIPE IN REACTOR PRESSURE VESSEL AND SAMPLING DEVICE FOR ATTACHMENT ON INTERNAL WALL
Document Type and Number:
Japanese Patent JP3709515
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a device and a method for collecting the specified quantity of attachment from the pipe installed in the water in a reactor pressure vessel, prohibiting collection of internal wall attachment from a branch pipe.
SOLUTION: An inlet mixer 3 is placed on a bearer 11 of a pipe internal wall attachment collecting device 10 provided at a reactor well 8, and a pump 16 is driven to suck water in the inlet mixer 3 through a filter 15. At this time, a motor 14 is driven to rotate a brush 13. The internal wall attachment is thereby separated and recovered by a filter 15. If necessary, after completing collection, calipers or the like are used to confirm the surface area of a part from which the attachment is separated. After collecting work is completed, the inlet mixer 3 is restored. The specified quantity of attachment can be collected even frame pipe installed in the reactor pressure vessel, prohibiting collection of the internal wall attachment from a branch pipe and re-injection timing of zirconium or the like can be evaluated.
Inventors:
Shigeki Ohno
Nobuo Tada
Minoru Maeda
Nobuo Tada
Minoru Maeda
Application Number:
JP2000050890A
Publication Date:
October 26, 2005
Filing Date:
February 28, 2000
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
G01N1/04; G21C17/00; G21C17/003; G21C17/01; G21F9/00; G21F9/28; (IPC1-7): G21C17/003; G01N1/04; G21C17/00
Domestic Patent References:
| JP3249540A | ||||
| JP9292486A | ||||
| JP8005773A | ||||
| JP8071520A | ||||
| JP2105036A | ||||
| JP9297197A |
Attorney, Agent or Firm:
Hirotsugu Yoshioka