Published March 10, 1988 | Version v1
Patent Metadata-only

Feedwater control in a PWR following reactor trip

Creators

Description

Excessive primary cooldown and start up of the auxiliary feedwater system in a pressurized water reactor (PWR) following a reactor trip are avoided by switching to primary coolant Tavg programmed, main feedwater flow control in place of normal level programmed control. The low Tavg set point at which the main feedwater isolation valves are closed is lowered below the no load Tavg temperature set point and the flow rate is decreased gradually to zero at a Tavg between these two set points. In addition, the low low-level set point at which the auxiliary feedwater system is started is lowered if possible, and/or the level signal is filtered, or the start signal delayed, to increase the margin to the low low-set point

Availability note (English)

Available from the Patents Office, Private Bag X400, Pretoria, 0001, South Africa.

Additional details

Publishing Information

Imprint Pagination
29 p.
IPC:
Int. Cl. F 22 D; G 05 D; G 21 C.
IPC
Int. Cl. F 22 D; G 05 D; G 21 C.
Patent number
ZA patent document 87/6416/A/

INIS

Country of Publication
South Africa
Country of Input or Organization
South Africa
INIS RN
19068618
Subject category
S22: GENERAL STUDIES OF NUCLEAR REACTORS;
Resource subtype / Literary indicator
Non-conventional Literature
Descriptors DEI
AUXILIARY SYSTEMS; CONTROL; COOLANTS; FEEDWATER; PWR TYPE REACTORS; REACTOR START-UP
Descriptors DEC
ENRICHED URANIUM REACTORS; HYDROGEN COMPOUNDS; OXYGEN COMPOUNDS; POLAR SOLVENTS; POWER REACTORS; REACTORS; SOLVENTS; START-UP; THERMAL REACTORS; WATER; WATER COOLED REACTORS; WATER MODERATED REACTORS

Optional Information

Secondary number(s)
US priority 912,854.