ML20030A343

Chapter 6 to Final Hazards Summary Rept for Big Rock Point, Power Sys Equipment

ML20030A343
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	11/14/1961
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
References
NUDOCS 8101090350
Download: ML20030A343 (7)

Text

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' O Section 6 g

Page 2 6.2.2 The main turbine condenser is a fabricated steel, horizontal, single pass, divided water box de-acrating type unit of conventional cons truction. It is spring supported and solidly connected to the turbine exhaust flange. The unit has an effective condensing surface of 27,500 square feet. The condenser is located dir ectly beneath the low pressure turbine with its tubes perpendicular tc the turbine centerline. Provision is made for accommodating bypass steam at reduced pressure in the condenser, (No additional condensing surface is required for this function, however). Admiralty metal tubing is used with Munta metal tube sheets.

6.2.3 A 6000 gallon, oversized, baffled, stcrage-type hotwell is -

provided to allow decay of short-lived radioactivity. The hotwell is divided by a partition plate parallel to the tubes to facilitate location of tube leaks.

6.2.4 A single twin-element, two-stage steam-jat ejector with stir-face type inter and after-condenser is provided. Each ele-ment is capable of removing 10 cfm of free air leakage plus 1.4 lbs/hr of hydrogen and 10.1 lbs/hr of oxygen gas from the reactor.

6.2.5 A motor-driven, wet-type, rotary vacuum pump with a capac-ity of approximately 600 cfm of air at 15" Hg absolute pres-sure is provided for rapid evacuation of the ccadenser steam -

space at startup.

6.2.6 The air and gas removt equipment discharges to the main exhaust stack.through oversize piping systems which pro-vide holdup time enroute.

6. 3 CONDENSATE AND FEEDWATER SYSTEhi AUXILIARIES 6.3.1 Extraction Drains and Vents t

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6. 3.1.1 Extraction steam for feedwater heating is taken from three l

points off the turbine to the respective heaters. The two higher pressure extraction lines are provided with automatic bleeder trip valves to protect the turbine from flooding, in the event of a heater tube break, or over-speed from steam flashing out of the heater after a turbine trip.

6. 3.1. 2 Water collected from the turbine moisture removal stages is piped to the drain cooling sectioriof either the high inter-mediate or low pressure heate'rs.

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drams are cascaded to the condenser where they are de-aerated and added to the condensate flow.

6.3.2 Condensate Pumps

6. 3. 2.1 Two half-capacity, vertical, multi-stage centrifugal pumps 1

pump the condensate from the hotwell through the condensate system to the suction of the reactor feed pumps.

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Secdon 6 Page 3 I

i 6.3.2.2 The condensate pumps deliver condensate through the air ejector inter and after-condenser, turbine gland seal con-denser, condensate demineralizers, low pressure feed-water heater, and intermediate pressure feedwater heater, r

in series.

6.3.3 Condensate Demineralizer System 6.3.3.1 Three half-capacity mixed-bed ion exchangers designed for a maximum flow rate of 50 gpm/ftd are provided for removal of reactor solids carry-over and turbine-condenser system corrosion products from the full condensate flow.

In normal operation, two of the demineralizers will clean up the full condensate flow, while the third is being regen-erated or is on standby.

6.3.3.2 An external resin regeneration system consists of cation resin regeneration tanks and a combinatiot anion regen-eration tank and regenerated resin storage tsnk. Spent resins ~ are hydraulically sluiced from the desnineralizers to this system, where they are separated, individually regenerated and stored.

6.3.3.3 Spent resins are monitored for radiation level after removal from the ion exchangers before classification and regeneration.

If resin is found to contain a concentratic a of radioactive mat-erial as to pose unwarranted handling and disposal problems with the regeneration waste solution, the resin is sluiced directly to the radwaste system resin storage tank and re-placed with a fresh resin charge. Resin of low activity level is regenerated' and returned to service. Because of the potential radiation levels associated with this equipment, the ion exchangers and resin regeneration tanks are shielded with 2 inches of lead. The regeneration system is connected with the cleanup demineralizer and waste demineralizer so that this system is the source of resin supply for the clean-up and waste demineralizers. It is also possible to return used resins from the cleanup demineralizer for back-wash and regeneration.

6.3.4 Feedwater System 6.3.4.1 Feedwater Pumps Two feedwater pumps, taking suction directly from the condensate system, discharge feedwater through the high pressure heater and through a common header to the reactor steam drum.

They are horizontal, multistage, centrifugal pumps.

l 6.3.4.2 Feedwater Heaters Three feedwater heaters are located in the condensate circuit.

The. low pressure and intermediate pressure heaters are of the horizontal-mounted U-tube type with removal tube bundles, l

integral drain coolers, and bolted head covers.

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Section 6 page 4 The high pressurc heater is of the horizontal U-tube type with integral drain cooler. Channel connections are welded and tube maintenance is performed by cutting and removing a skirt section en the shell.

.6.4 AUXILIARY COOLING WATER SYSTEMS Piping and instrumentation details for the following systems are shown in Drawing M-111.

r 6.4.1 Service Water System _

6.4.1.1 The service water system is an open system in nich strained water is supplied from pumps in the intake struc-ture and returned to the lake along with the discharge from the circulating water system.

6.4.1.2 The service water system removes heat from the following equipment:

Generator Hydrogen Coole rs Turbine Lube Oil Coolers Feed Pump Bearings and Oil Coolers Air Compressor Aftercoolers and Jackets Miscellaneoas Sample Coolers Air Conditioning System j

Reactor Et. closure Air Coolers Space Heating and Cooling Reactor Cooling Water Heat Exchangers Two fult-capacity, verticaI turbine type service water pumps are provided.

6.4.2 Reactor Cooling Water System

6. 4. 2.1 The reactor cooling water system is a closed intermediate cooling loop utilizing demineralized water to remove heat from the following pieces of equipment:

Reactor Shield Cooling Panels Reactor Cleanup Non-Regenerative Heat Exchanger Reactor Shutdown Heat Exchanger Fuel Pit Cooling Water Heat Exchanger Miscellaneous Sample Coolers Reactor Recirculating Pump Coolers The reactor cooling water heat exchangers are the equip-6.4.2.2 ment by which the removed heat is transferred to the service water system. The return header is monitored to indi cate and alarm excess radioactivity buildup. Two full capacity, vertical motor driven pumps are provided which take suction from the concrete cooling water return tank and recirculate the cooling water through the heat exchangers to the various equipment services listed above.

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m Section 6 Page 5 6.~ 4. 3 Condenser Circulating Water System

6. 4. 3. l' Condenser cooling water is drawn from Lake Michigan through a submerged line extending out approximately 1400' from the shore. This line empties into the intake structure on the shore, where the water passes.through bar racks and screens and is then pumped through undergrcund 1

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lines to the condenser b'y two half-capacity, vertical, axial flow, wet-pit type pumps. The circulating water is carried

- from the condenser through an underground line to the i

discharge headworks at the shoreline. The circulating water discharges through an adjustable weir chamber at its terminus.

6.4.3.2 The intake structure consists of two compartments, each with a sloping bar rack, a traveling water screen, and a cir ulat-ing water pump. A third center compartment supplied s

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screened water from either or both of the two other cor..,

rt-ments forms the pump well for the two service water pumps,-

the scre'.n wash pump, the electric and diesel engine driven fire pumps and the fire system jcckey pump. Provision for stop logs for dewatering either of the two principal compart-ments is also included. Pumps and screens are removcd for maintenance throughroof hatches in the enclcsing struc-ture. The emergency diesel generator is housed immediately adjacent to the intake structure.

6. 5 MAKEUP WATER SYSTEM Makeup water to the stean) and condensate system, and demineralized water for the reactor cooling water system-and other requirements are supplied by a single mixed-bed ion exchanger of standard commercial design. Operation of the demineralizer is manually initiated as determined by demineralized water requirements.

6. 6 INSTRUMENT AND SERVICE AIR SYSTEM Three 70 cfm motor driven, non-lubricated air ccmpressors rated at 105 psig supply both instrument and service air to the plant. Each compressor has its own receiver, the receivers being sized to provide approximately 10 minutes normal air requirements after a loss of auxiliary pawcr.

Normally, one compressor will supply all plant air, with a sccond on automatic standby. Air from the three receivers q

passes into a commm header which supplies service and instrument air. A dryer is provided in the instrument air supply r

i line. The system is shown in Drawing M-133.

6. 7 ELECTRICAL SYSTEM 1

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f Section 6 Page 6 i

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6. 7.1.1 The electrical system consists of the main power equipment, the auxiliary power system and the emergency power systera,

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as shown on the electrice.1 single line meter and relay dit.-

i grams, Drawings E-101 and E-102.

6. 7.1. 2 '

The main power equipment is comprised'of the main generator, the generator breaker, the main transformer and the linc breaker.- The breakers and transformer are located in the t -

cutdoor substation from which power is delivered into the i

- Consumers Power Company transmission systerr..

6. 7.1. 3 The auxiliary power system is the normal source of service power to the station under both operating and shut-down cen-ditions. The general philosophy of design of this sj stem is to supply duplicated services from different buses, where-4 ever possible, so that failure of one bus would still permit operation of the alternate unit. This is done primarily for continuity of plant operation.

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6. 7.1. 4 The emergency power system provides power for those services necessary to prevent serious damage or hazards to equipment and persennel in the event of loss of the aux-iliary power system.

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J 6.7.2 Auxiliary Power 6.7.2.1 Auxiliary power is obtained from either tie main ger.erator or from the transmission system for normal plant ojierating or shutdown con-ditions, respectively, through the station service transformer con-i nected to the 2400 volt switchgear bus. ~ Each of the two 480 volt systems obtain power from a separate transformer connected to the 2400 volt bus.

6.7.2.2 A 125 volt DC battery system furnishes power for ncrrnal switchgear control, turbine control, annunciators and various emergency functions, including the DC mo:or -

operated sphere. isolation valves.

6.7.2.3 The reactor instrumentation and protection circuits are fed from three 120 volt AC buses. Each of two buses is supplied a

from a different 480 volt system through its own motor-generator set. Each motor-generator is equipped with a -

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'lywheel to sustain operation during normal power system dis tu rbances. The third bus is supplied from the 125 volt f-DC system through a static inverter.

' 6. 7. 3 Emcrgency Power Emergency power is obtained from a diesel-generatcr whhh j

is automatically started on a loss of auxiliary power. The -

electric driven fire pump and reactor building air-locks are i

automatically available for service as soon as the diesel 3

generator has reached rated voltage. Other emergency services can be selected manually as required.

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Section 6 Page 7

6. 8 ~

PLANT SERVICES SYSTEMS

-Conventional services are provided for the plant as described below and shown in the following drawings:

Drawing M-Il9 Service Building Ventilation Drawing M-124 Turbine & Service Building Ventilation Drawing M-125 Reactor Building Service Systems

6. 8,.1 Fire Protection

6. 8.1.1 The fire protection system furnishes water to all points throughout the plant area, buildings, etc., where water for fighting fires may be required. Water is provided by an electric driven fire pump rated 1000 gpm at 110 psig, or during an outage of the electric pump, a full capacity standby diesel driven pump. Normally, pressure is maintained in the fire system by a small fire system jockey pump and accumulator tank. Each of the pumps on the fire system takes suction from the circulating water intake structure.

6. 8.1. 2 Hose houses, hose-racks, automatic sprinkler-heads, and manual fire extinguishers are located throughout the plant.

A CO2 system is provided for purging H2 from the generator.

6.8,2 Sanitary service 1

6. 8. 2.1 The sanitary system collects all sanitary wastes from the plant buildings, and conveys them by gravity into a septic tank. The effluent is chlorinated before discharge into Lake Michigan.

6.8.2.2 A laundry consisting of an automatic washer and dryer is provided for washing articles of protective clothing that are used during operation and maintenance in the controlled I

access areas cf the plant. Water from this laundry is collected in a laundry waste tank and monitored. Depend-ing on the activity level, the laundry wsstes will be either

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processed or discharged to the circulating water canal.

6.8.3 Potable Water

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Domestic water is supplied by a well located approximately 800 feet east of the plant. A well water transfer pump draws I

water from the well water storage tank and delivers it to the domestic water pump that '.s located in the screen struc-tur e.

The domestic water pump supplies an accumulator which maintains a system pressure of approximately 80 psig. The accumulator is pressurized by the plant service air system.

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i Section 6 Page 8 6.' 8. 4 Heating and Ventilating 6.8.4.1 Heating steam is supplied to various parts of the plant by a 15 psig oil fired package boiler.

6.8.4.2 During the summer, cooling is provided by ventilating through local cooling coils supplied from the service water system.

6.8.4.3 The reactor containment vessel and portions of the turbine building are provided with both forced and induced draft ventilation.

This provides for ventilating all potentially contaminated areas so as to avoid the existence of any hazardous condition to the plant proper or surrounding areas during normal plant ope ration.

6,8.4.4 The reactor containe ent vessel ventilation air inlet and ou:let pene-trations are each provided with a pair of pneumatically operated valves which close automatically on loss of power or on any scram signal. Each pair of valves consists of one swi:rg type valve with a high temperature synthetic rubber seat and one butterfly type valve with high temperature synthetic rubber lining. Each pair of valves for each pene-tration is connected in series. The valve operators are arranged for " air to open" and " spring to close". The operator springs in the closed position exert sufficient torque on the valve disc shafts to positively seat the valve discs and assure essentially 100% air tightness. A test connection is provided to pneumatically test the tightness. The closing time of each type of valve is six (6) seconds or less.

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