ML20170A406
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Page 1 of 9 DSAR-7.6 Instrumentation Systems Operating Control Stations Rev 2 Safety Classification: Usage Level:
Safety Information Change No.: EC 70007 Reason for Change: Remove reference to waste gas.
Preparer: T. Rice Fort Calhoun Station
DSAR-7.6 Information Use Page 2 of 9 Operating Control Stations Rev. 2 Table of Contents 7.6 Operating Control Stations.............................................................................................4 7.6.1 General Layout .............................................................................................. 4 7.6.2 Main Control Room ....................................................................................... 5 7.6.3 Radioactive Waste Disposal System Control Panels .................................... 6 7.6.4 Miscellaneous Local Control Stations ............................................................ 7 7.6.5 Features Which Enhance Safety ................................................................... 8 7.6.6 In-Plant Communication System ................................................................... 8 7.6.7 Off-site Communication ................................................................................. 9 7.6.8 Deleted .......................................................................................................... 9 7.6.9 Deleted .......................................................................................................... 9
DSAR-7.6 Information Use Page 3 of 9 Operating Control Stations Rev. 2 List of Figures The following figures are controlled drawings and can be viewed and printed from the listed aperture card.
Figure No. Title Aperture Card 7.6-1 Control Room Panels ......................................................................... 36563
DSAR-7.6 Information Use Page 4 of 9 Operating Control Stations Rev. 2 7.6 Operating Control Stations 7.6.1 General Layout Normal plant control is handled in the control room. This room is located in the northeast corner of the auxiliary building at elevation 1,036'-0". The room is adjacent to the operating floor of the turbine building.
Other control functions are handled at the following locations:
- a. The waste disposal system is controlled from panels AI-100, AI-102, and AI-103, located in the auxiliary building on the north side at elevation 989'-0".
- b. Deleted
- c. Local control stations for the diesel-generators, panels AI-133A and AI-133B, are installed in the diesel-generator rooms. The diesel-generators can be started locally and controlled from these panels in the event that the control room cannot be occupied.
Diesel-generator loads can be controlled from switchgear and control centers under such circumstances.
- d. The auxiliary building area ventilation air temperatures are controlled at local panels adjacent to the air handling units.
- e. Air compressors are controlled from a local panel. This panel includes sequencing controls.
- f. Deleted
- g. The demineralized water system has instrumentation and controls in panel AI-104, located in the water plant area of the Service Building.
- h. Deleted
- i. Deleted
- j. Deleted
- k. The Spent Fuel Pool Cooling System is controlled locally.
DSAR-7.6 Information Use Page 5 of 9 Operating Control Stations Rev. 2 7.6.2 Main Control Room The location of the main control room is shown in P&ID 11405-A-8. This location places the control room in an area designed as Class I with regard to seismic disturbances and tornadoes. It also provides easy physical access to the turbine room and the reactor plant. The plant has been laid out to minimize the length of cable run to the switchgear. A cable spreading room is located directly underneath the control room. The arrangement inside the control room is shown in Figure 7.6-1.
The main control board is a duplex benchboard. Panel CB-4 is located in the corner of the L. Directly to the right of panel CB-4 is panel CB-10/11. Panel CB-1/2/3 is located to the left of panel CB-4. The instrumentation and controls located in CB-4, CB-10/11 and much of CB-1/2/3 largely have no design function. Remaining functional instrumentation and control items include Distributed Control System (DCS) board mounted workstation operator interface units.
The left-hand third of CB-1/2/3 is occupied by the component cooling and raw water system controls. These systems also operate automatically, and the operator can override the automatic controls. The controls located here govern pump operation and the valves which determine the flow paths used by the coolant. The latter capability is given the operator so that he can maintain control of the system in the event of malfunctions. Component cooling water system flow is controlled from panel AI-45, behind the main control board.
The extreme right-hand end of the main control board is formed by the electrical panel CB-20. The electrical distribution system within the plant and the electrical connections between the plant and external electrical systems are controlled here. Once set up, this board requires minimal operator attention during normal plant operation.
Computer "desks" are arranged in the area directly before the main control boards. These desks include the operator's console with equipment and user terminals for communication with the computers and provision for writing areas.
A row of panels exists across the room from the main control board. The last cabinets in this line are the radiation monitoring panels AI-33A, AI-33B, and AI-33C. These panels have alarms, indicators, and recorders for the radiation monitors.
DSAR-7.6 Information Use Page 6 of 9 Operating Control Stations Rev. 2 Two rows of panels behind the main control board contain instruments, controls, and auxiliary equipment (e.g., power supplies) which require only occasional supervision. The functions of these panels include component cooling water system controls, auxiliary building ventilation and purge systems controls, fire detection and lighting.
Panels AI-106A and AI-106B are the control room air conditioning system control panels and are located out of the main operating area along the south wall of the control room. These panels contain controls and instrumentation for the control room air conditioning units, emergency filtration units, and the control room iodine monitor. These systems are designed to require minimal operator attention.
7.6.3 Radioactive Waste Disposal System Control Panels The radioactive waste disposal system is controlled by a combination of automatic, remote-manual, and local operations. Remote-manual operations are conducted from panel AI-100 located in the auxiliary building at elevation 989'-0" near the processing equipment. The panel also contains supervisory instrumentation for the automatic functions and annunciators.
Panel AI-100 is used to control the following functions:
- a. Water transfer from the waste holdup tanks, hotel waste tanks, and spent regenerant tanks to the inlet treatment header or monitor tanks;
- b. Treated water from the monitor tanks to the overboard header or for further treatment; In cases where redundant components are provided, selection of the equipment to be used is made from the panel. Equipment which is supervised from this panel, and normally operated automatically, can also be operated manually from this panel as follows:
- 1. Waste holdup recirculation pump
- 2. Auxiliary building sump tank and pumps
- 3. Spent regenerant tank pumps
- 4. Waste filters (no controls)
- 5. Spent resin tank
- 6. Containment sump pumps The portions of the liquid and solid radwaste processing system in the Radioactive Waste Processing Building are controlled from local panels near the mobile process equipment. Because of the nature of this equipment, each system has its own unique controls.
DSAR-7.6 Information Use Page 7 of 9 Operating Control Stations Rev. 2 7.6.4 Miscellaneous Local Control Stations As far as possible, the control of plant systems is concentrated in the control room. The diesel-generators can also be controlled from panels located in the diesel-generator rooms. As described previously the waste disposal system is controlled from outside the control room; other panels, described below, have also been found desirable to control local functions. The local panels are:
- a. Deleted
- b. Diesel-generator panels (AI-133A and AI-133B): These panels include master switches which disconnect all external sources of supply from the station bus, shed all non-essential loads, disconnect all engine and generator protective devices except overspeed trip and isolate control from the safeguards panels, AI-30A and AI-30B. Operation of the master switch allows local operation of the diesel breaker emergency switch to connect the generator to the station bus. VA-759A and VA-759B provide temperature control for AI-133A and AI-133B to maintain the temperature equal to or less than 50°C (122°F). Each diesel-generator is also provided with an integral panel which permits starting the unit and isolating control of the engine from the control room.
- c. Temperature control panels for the auxiliary building ventilation systems:
The panels contain controllers only (see Section 9.10.2.1); thermostats are located elsewhere.
- d. Vacuum deaerator control panel (AI-105): This equipment normally operates automatically; the panel contains supervisory equipment.
- e. Air compressor control panel: The air compressors run automatically; the panel includes unloading controls, supervisory instrumentation, and an operation sequence switch.
- f. Deleted
- g. Deleted
- h. Screen wash panel (AI-120): This panel contains screenwash pump controls and supervisory instruments. Traveling screen local control panels AI-340A/B/C/D/E/F interface with the Distributed Control System (DCS) and control each associated screen and integral wash system.
- i. Deleted
- j. Deleted
DSAR-7.6 Information Use Page 8 of 9 Operating Control Stations Rev. 2 7.6.5 Features Which Enhance Safety All panels and consoles are enclosed. Panels within the control room are individually air cooled where required. All cables enter from the cable room below; the sleeves between the cable room and control room are sealed. A fire originating outside the control room could not spread to the control room through the duct system or cable sleeves. Further, since combustible materials are excluded from the control room as far as practical, the danger of fire in the control equipment is minimized.
The panels were arranged to minimize the span of attention required from the operator for better monitoring of plant conditions. Items most likely to require frequent or immediate attention are grouped toward the center of the panel and equipment requiring less frequent attention toward the ends of the panel. The decommissioned plant retains the pre-shutdown control board arrangement although most items not related to spent fuel pool cooling no longer provide any function.
7.6.6 In-Plant Communication System The in-plant communication system comprises two separate systems, a GAI-Tronics Transistorized Communication (GTC) system and a sound-powered, telephone system. The dial telephone system is not a plant-wide system and is not intended for in-plant communication. The dial telephones each have individual numbers and are connected to the District's internal telephone system and the local telephone company exchange.
OPPD's 800 Mhz radio communication trunking system has been expanded to Fort Calhoun and is available to various groups at the plant. This system is not considered a plant wide system.
The basic GTC system is made up of handsets which have a local speaker amplifier and are distributed at strategic locations throughout the plant. Jack stations are also located in containment for use with portable handsets and amplifiers.
DSAR-7.6 Information Use Page 9 of 9 Operating Control Stations Rev. 2 Two single channel sub-systems complement the basic three channel system. As an aid to fuel handling operations, handsets at the fuel pool area and the refueling crane inside the containment permit intercommunication between these areas and the control room. Certain handsets in the control room are, therefore, equipped with an additional channel. The GTC system is supplied from the 120-Volt instrument ac system (see Section 8.3.5).
The sound-powered telephone system is provided to facilitate maintenance and to back up the main electronic system. Sound-powered telephone jacks are distributed throughout the plant at certain GTC system locations.
Portable handsets and portable headsets are provided. The system has two channels to provide the facility for two separate conversations utilizing up to the total number of handsets and headsets available.
7.6.7 Off-site Communication Off-site communication comprises five separate systems, a dial telephone system connected to the District's internal telephone system and the local telephone company in Blair and Omaha; dedicated leased telephone lines for various functions; a microwave transmission system; 800 Mhz two way radio system and backup radio systems (Washington County Sheriff contact and emergency 800 Mhz radio communication backup with all OPPD's power plants) provided in case of failure of telephone and/or radio system.
7.6.8 Deleted 7.6.9 Deleted