Control device for the withdrawal of control rods
Description
Purpose: To suppress the control rod worth as less as possible upon start-up and shutdown of BWR type reactors. Constitution: In the conventional control rod withdrawing operations, control rods to be withdrawed are divided into four groups and then withdrawed successively from the first group. However, according to this method, the control rod worth becomes highest at the time of withdrawing the third group and, if the control rod should fall, local power up would be resulted to impair the fuel integrity. In this invention, upon withdrawing a specified group of control rods, they are withdrawed once at an intermediate withdrawal position and, after all the control rods of the specified have been withdrawed to the withdrawal position, these control rods are finally withdrawed. In this way, the control rods worth upon withdrawal can entirely be reduced to improve the safety. (Kamimura, M.)
Availability note (English)
Available from JAPIO. Also available from INPADOC.Additional details
Publishing Information
- Imprint Pagination
- 12 p.
- IPC:
- Int. Cl. G21C7/16.
- IPC
- Int. Cl. G21C7/16.
- Patent number
- JP patent document 60-117188/A/
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 17047501
- Subject category
- S22: GENERAL STUDIES OF NUCLEAR REACTORS;
- Resource subtype / Literary indicator
- Non-conventional Literature
- Descriptors DEI
- BWR TYPE REACTORS; CONTROL ELEMENTS; CONTROL EQUIPMENT; CONTROL ROD WORTHS; REACTOR CONTROL SYSTEMS; REACTOR SHUTDOWN; REACTOR START-UP
- Descriptors DEC
- CONTROL SYSTEMS; ENRICHED URANIUM REACTORS; EQUIPMENT; POWER REACTORS; REACTOR COMPONENTS; REACTORS; SHUTDOWN; START-UP; THERMAL REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS
Optional Information
- Secondary number(s)
- JP patent application 58-225764.