Supply Control System

Nuclear steam supply control system— Implements the operator s control decisions and automatically changes the plant to and maintains it at selected operating states. Reactor protection system—Protects the reactor core and the NSSS by monitoring operating parameters and initiating safeguard actions on the detection of abnormal conditions. 

After issuance of this document generally referred to as the McNarney directive, the ASF set up a system aimed at closer co-ordination of the various phases of procurement and distribution. Known as the Supply Control System, it was formally announced in ASF Circular 67, 7 March 1944. Its aims were summarized as follows by the Requirements and Stock Control Division, ASF, at the time the system was being put into operation ... 

The Supply Control System adjusts production to demands by requiring realistic estimates of equipment and weapons needed for ... 

In conformity with the provisions of ASF Circular 67, the Chief, CWS, established a Materiel Planning Branch in April 1944 to compute requirements under the Supply Control System. There was a difference of opinion between the two Assistant Chiefs, CWS, over who should control the work of this branch. General Waitt, Assistant Chief for Field Operations, believed he should have the responsibility because he felt that the determination of requirements should be entirely divorced from procurement and supply activities.General Ditto, Assistant Chief for Materiel, maintained on the other hand, that the requirements function could not be separated from procurement and supply activities and that he should therefore have jurisdiction over the new branch. General Porter intervened with a compromise solution by directing that the Chief of the Materiel... 

Memo, Reqmts and Stock Control Div, ASF, sub The Supply Control System. Reqmts and Stock Control Div ASF File. 

Shortly after the Supply Control System was inaugurated, the War Department revised its troop basis to include about 13,000 organizations. The Materiel Planning Branch computed requirements for these units on a Table of Allowances basis. It used a key punch multiplier to obtain the gross requirement of chemical warfare items by multiplying the number of units, organizations, and individuals on the current troop basis by the stated number of items listed for the unit, organization, or individual on the Tables of Allowances. 

The gross requirement was the keystone on which estimates were based under the Supply Control System. It was modified for each item in accordance with one or more of the following factors stock on hand, estimated special requirements, current issue experience, amount in the pipeline needed to maintain an even flow of supplies, production lead time, impending standardization of a substitute item, abnormal replacement rates of principal components, and required special handling or storage. 

Another move to improve the spare parts situation came with the inauguration of the Supply Control System. In order to analyze the stock control position of each of the 10,000 CW parts, it was necessary to scrutinize carefully their procurement and supply status. To obtain the necessary data on spare parts as well as on end items, the Materiel Planning Branch was assigned the mission of collating the Stock Status reports and the monthly procurement reports. 

Though the stock control system led to marked improvement in the issue of items, a serious deficiency in the distribution system still remained. That deficiency was failure to control the flow of materials from production lines to the depots. "That, said General Lutes after the close of World War II, "is an excellent illustration of one of the most important lessons about Army supply that is, that the supply process is an individual entity and cannot be broken down into un-co-ordinated phases such as production, stock control, and distribution. With the advent of the supply control system in the Army in the spring of 1944 came a concerted effort to co-ordinate the various phases of the supply process. ... 

See ch. XIII above for fuller discussion of the Supply Control System. 

In addition to the controlling computer the system contains only a small control unit - PSP-4 (weight approx. 5 kg.) which among other system components includes a motor control system integrated closely with the PS-4 ultrasonic system. For communication between the PSP-4 control unit and the robot as well as robot power supply is used a single cable less than 10 mm. in diameter. 

The electronic block, which includes block of the analysis and registration and control system engines, and block of the source-receiver of acoustic oscillations are universal for any installations of this type. As the source-receiver of acoustic oscillations the ultrasonic flow detector is usually use. It s, as a rule, the serial devices for example y/f2-12. The electronic block contains the microprocessor device or PC, device of the power supply and management of engines... 

The next step is to apply a number of loss control credit factors such as process control (emergency power, cooling, explosion control, emergency shutdown, computer control, inert gas, operating procedures, reactive chemical reviews), material isolation (remote control valves, blowdown, drainage, interlocks) and fire protection (leak detection, buried tanks, fire water supply, sprinkler systems, water curtains, foam, cable protection). The credit factors are combined and appHed to the fire and explosion index value to result in a net index. 

For LOCs of 5 percent and greater, the O9 concentration should not exceed 60 percent of the LOC, but with continuous monitoring the O9 may be kept 2 percent below the LOC (NFPA 69, 1992). Neutronics, Inc., of Exton, Pennsylvania, supplies an inerting control system that has had wide apphcation in many industries. 

Programmable Logic Controller (PLC) A microcomputer-based solid-state control system which receives inputs from user-supplied control devices such as switches and sensors, implements them in a precise pattern determined by instructions stored in the PLC memory, and provides outputs for control or user-supplied devices such as relays and motor starters. 

A few TCRs to balance the reactive power supply. They may generate harmonics, which must be suppressed to avoid any resonance. T.SCs and TCRs are monitored through a feedback control system,... 

Motor-driven reciprocating compressors are sometimes used in tonnage oxygen plants. To maintain a uniform output, the plant must be supplied with a constant weight flow of air. As ambient conditions change weight flow, a control system as shown in Figure 8-40(f) can be used to keep the plant supplied with the proper quantity of air. The necessary steps in this system are ... 

The facility costs are based on the concept of a mobile remote repair facility. The advantages of this concept are low-cost, minimal shielding requirements, and flexible use of the overall repair facility. The main components for a remote repair are the electron accelerator, the power supply, and the robotic control system including the remote video system. Table 14 shows the estimated costs for these main components. 

The facility stores ammonia to supply nearby fertilizer manufacturers. It is transported to the plant by ship, transferred and stored in the tank for transfer as needed. The facility mainly consists of a storage tank, a refrigeration system, a control system, and a pipe connecting the tank with the plants. Ammonia is transported and stored as a refrigerated liquid (-33 C) at atmospheric pressure. 

Solid-State DC Drives. The controlled-thyristor rectifier and separate-field DC motor is the solid-state motor drive in greatest use. The combination provides control over at least a 10 1 speed range, plus an additional two to three times by field weakening. Depending upon the power level, the rectifier is operated directly from the AC supply lines, or via a transformer. Typical speed regulation of 2% can be accomplished with a single control system. The horsepower and speed limitations are set by the DC motor, not by the semiconductor rectifiers. The DC motor and rectifier can be combined to any required power level. 

Capacitors as bulk units can be connected to the supply busbar via a fuse switch, molded-case circuit breaker of air circuit breaker. In this type of installation control is purely manual, and in cases of a reasonably constant load and where the amount of power factor correction is limited such a manually controlled system is perfectly adequate. The supply authority may, however, require to be informed that a capacitor bank is permanently connected to the supply. Capacitors are more generally connected either in banks controlled from a VAR sensitive relay or across individual loads (e.g. motors). 

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