Protection is accomplished by the rapid insertion of negative reactivity with control rods or other reactivity mechanisms to shut down the fission more » process and reduce heat generation in the fuel. Data networks transfer information between systems for control, display, and recording. The Plant Instrumentation, Control, and Data Systems and the Reactor Instrumentation and Control System of the ANS are planned as an integrated digital system with a hierarchical, distributed control structure of qualified redundant subsystems and a hybrid digital/analog protection system to achieve the necessary fast response for critical parameters. This paper describes the reactor control and plant protection systems' conceptual design of the Advanced Neutron Source (ANS). Six thermocouples in instrumented fuel elements, 3 fission chambers and 22 self-powered detectors provide the majority of signals for all parts of the ACRR Control System. These channels contain digital readouts and peak hold circuits for data retention after the pulse. This includes most of the pulse diagnostic channels such as peak power, pulse energy yield, reactor periods and maximum fuel temperature. The remainder of the ACRR instrumentation is for diagnostic purposes. The ACRR timer is a multifunctional timer which fires rods in pulse modes and drops rods in all modes of operation. Operational interlocks, which assist the operator in performing operations in a proper sequence, are also contained in a single drawer. All shutdown logic, including spare shutdowns for experiments, are contained in a single instrumentation drawer. A shutdown interrupts power to the magnet power supply. The wide-range log/ linear percent power channels provide shutdown capability for each linear-power range and for reactor period. All regulating rods (2 safety, 6 control and 3 transient rods) are mechanically driven by stepping-motor drives which along with digital position indicators are capable of 0.25 mm resolution. The components of the control system are rod drives and position indicators, two wide-range log/linear power channels, fuel temperature instrumentations, a shutdown drawer, an operational interlock drawer, and the ACRR timer. The control system consists of all components used to control power and reactivity. The PPS is not used for control purposes, but is solely intended to provide protective action. Manual scram and the low detector bias voltage scram are provided in all modes of operation. C and 115% of nominal maximum steady-state power of 2.0 MW. ![]() The LSSS values for these safety channels are, respectively, 1400 deg. In the steady-state modes of operation, the PPS has scram capability on fuel temperature and percent power. ACRR Technical Specification LSSS values for these parameters are 1400 deg. ![]() In the pulse modes of operation, each PPS instrumentation drawer has scram capability on fuel temperature, peak power (nv), and energy (nvt). The PPS satisfies the intent of the more » IEEE-279 standard, in as much as it contains diverse, redundant, and physically and electrically-isolated protective action channels. The safety related instrumentation for the ACRR is contained in the Plant Protect System (PPS), which includes two instrumentation drawers and the magnet power supply. During the first two years of operation, the ACRR Control System has performed in an excellent manner satisfying all of its original objectives. The ACRR Control System replaced the ACPR control console and includes many features which improve safety, control, and flexibility in the operation of the reactor. The Annular Core Research Reactor (ACRR) Control System was designed by Sandia National Laboratories and built by General Atomic Company.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |