CLASS II (UPS) LOAD LIST

Control & instrumentation
Item	Qty.	Load(KVA)
48 VDC SV	1800	7.00
Transmitter	550	1.00
PLC		2.20
Server/SCADA		2.25
CR Panel inst		2.97
EM. Relay	1000	2.00
Electrical system
Pump Indicator	35	0.20
Pump actuator	50	0.20
Lighting	22	3.00
Miscellaneous
Fire alarm system		1.00
CCTV system		1.00
Access control system		1.00
Panel Indicator		0.20
Nuclear Instruments		1.50
Other Electrical Loads
DG set control panel		1.00
SCADA sub station		2.00
Electrical Panels		2.00
Lighting loads		2.00
Other C&I loads		8
Total Load		40.53

TABLE – V

CLASS I (DC) LOAD LIST

Sl. No.	Load Details	kVA rating
1.	Exit lights for low block, high block and ROP s/s	21 kVA
2.	Indicating lamps	0.56 kVA
3.	Trip coils of ACB	2.5 kVA (Random load)
4.	Spring charging motors	0.4 kVA(Random load)
	Total load (Continuous + Random load)	24.46 kVA

Annexure-1

1.         Technical specifications for Electrical System

1.1       Applicability

Applies to electrical power supply systems.

1.2       Objective

To ensure the availability of electric power supply for safe operation of the plant.

1.3       Specifications

1.3.1    Class-IV power supply

At least one out the two nos., 33 KV feeders will be available before start of the campaign. In case of outage on any one of the feeders, the same will be made available within one month.

In case of major faults in 33KV switchgear, transformer, 415V L.T. switchgear, L.T. cable or bus duct, the same will be rectified and will be made available within one month.

1.3.2        Class-III power supply

1.3.2.1  Out of the two nos., 1000 KVA DG-sets, one DG-set will always be available. If

             any DG set goes out of service, it will be made available for operation within 7 days. However, at start of the campaign, both DG sets shall be available.         

1.3.2.2  Minimum stock of 2500 liters of diesel will always be available.

1.3.2.3  During class-IV power supply restoration, parallel operation of DG set with grid

             is not envisaged.

1.3.2.4    Single Air compressor system is provided on class-III power supply. To ensure

            the readiness and availability of emergency compressor system, it will be

             periodically checked for its healthiness.

1.3.2.5   ‘Specific fuel consumption’ of both DG sets will be measured on annual basis.

1.3.2.6   At least one Aviation Warning Light above 45 m height of stack level shall be available.

1.3.3   Class-II (Uninterrupted Power Supply (UPS) System)

One unit of 230V, 50 KVA A/C single phase, seismically qualified UPS power supply will always be available. If any UPS goes out of service, it will be made available for operation within 7 days. However, at start of the campaign, both UPS sets shall be available.         

1.3.4    Class-I (D.C. Power Supply)

At least one battery bank will be always kept in charged and healthy condition. In case of outage of any battery bank, the same will be made available within 72 hours.

1.4       Basis

1.4.1         Plant’s simultaneous maximum demand of 2455 KVA and connected loads of 3600 KVA are required to be met for normal operation. The simultaneous maximum demand of 2455 KVA can be met by any one of the two 33KV feeders.

1.4.2         Class III power supply is provided by DG sets. Rating of each DG set is such that 100% emergency loads can be started and fed even by one DG-set.

1.4.3         The DG-sets are provided with 2 nos. of fuel day-tanks of 2500 lt. capacity each. A provision of 2500 lts. of diesel stock will ensure operation of Off-gas blowers and exhaust (E2) fans for about 10 hours and with both day tanks, if kept filled up, these equipments can be run for a period of about 24 hours. That will provide sufficient time for arranging additional stock of diesel, as needed.

1.4.4         Under the black-out conditions, class-II UPS system is necessary for nuclear instruments, communication systems, essential lighting etc.

1.4.5         Exit lights need uninterrupted DC power supply, which can be fed by any one of the two DC battery banks.

1.4.6         110V DC control supply is required for operation and trip function of class-IV & class-III breakers.