Abstract: A self-test system for a nuclear power plant, nuclear reactor protection system is disclosed. Nuclear protection systems are the electronic controls, typically including circuit cards, located intermediate between sensors (as for detecting core overheat) and a control (as for providing rod injection to shut down a reactor). Constant surveillance of the nuclear system protection system is provided by a microprocessor that serially addresses protection system circuit cards and loads them at pre-determined input points with test commands. The addressed cards are thereafter simultaneously activated by a system-wide command. The test command is a pulse which is so short in duration that its affect is transparent to the system and cannot cause overall system operation. The pulse passes through the actuating electrical components to verify, on the real actuating path, the operating integrity of the system.

Abstract: Color video images are remotely painted on the screen of a conventional color television receiver or a video monitor utilizing electronic color image storage means in a control device. The control device comprises a manual input unit, an image or picture element memory, a palette or color memory controllable independently of the image memory, and color television signal generating circuitry. The system includes further features enabling an artist to record and to recreate the painted images. In one embodiment, relatively high resolution is achieved with minimal staining of adjacent image portions.