Emergency reactor shutdown device
Description
Purpose: To smoothen the emergency operation of the control rod in a BWR type reactor and to eliminate the external discharge of radioactively contaminated water. Constitution: A drain receiving tank is connected through a scram valve to the top of a cylinder which is containing a hydraulic piston connected to a trombone-shaped control rod and an accumulator is connected through another scram valve to the bottom of the cylinder. The respective scram valves are constructed to be opened by the reactor emergency shutdown signal from a reactor control system in such a manner that drain valve and a vent valve of the tank normally opened at the standby time are closed after approx. 10 seconds from the opening of the scram valves. In this manner, back pressure is not applied to the hydraulic piston at the emergency time, thereby smoothly operating the control rod. (Sikiya, K.)
Availability note (English)
Available from JAPATIC. Also available from INPADOC.Additional details
Publishing Information
- Imprint Pagination
- 5 p.
- IPC:
- Int. Cl. G21C7/14.
- IPC
- Int. Cl. G21C7/14.
- Patent number
- JP patent document 57-57284/A/
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 14779897
- Subject category
- S22: GENERAL STUDIES OF NUCLEAR REACTORS;
- Resource subtype / Literary indicator
- Non-conventional Literature
- Descriptors DEI
- BWR TYPE REACTORS; CONTAMINATION; CONTROL ELEMENTS; DELAY CIRCUITS; ECCS; HYDRAULIC CONTROL DEVICES; LEVELS; REACTOR SHUTDOWN; SCRAM; SYSTEMS ANALYSIS; TIMING CIRCUITS; VALVES; VENTS
- Descriptors DEC
- CONTROL EQUIPMENT; ELECTRONIC CIRCUITS; EQUIPMENT; FLOW REGULATORS; REACTOR COMPONENTS; REACTOR PROTECTION SYSTEMS; REACTORS; SHUTDOWN; WATER COOLED REACTORS; WATER MODERATED REACTORS