Term
| Function of Service Water |
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Definition
| "supply screened and strained river water to the intake structure, turbine and reactor buildings for plant cooling purposes during all modes of operation. Can also provide an inexhaustible supply of river water to the condenser hotwell to maintain feed flow to the reactor. Supplies water to Sodium Hypochlorite and fire protection system (jockey pump); and provides a backup water supply to the seal water system." |
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Term
| Service water standby pump start pressure setpoint |
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Definition
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Term
| RBCCW standby pump start pressure setpoint |
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Definition
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Term
| Indication that service water standby pump is actually in standby |
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Definition
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Term
| #11 Service water pump power supply |
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Definition
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Term
| #12 Service water pump power supply |
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Definition
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Term
| #13 Service water pump power supply |
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Definition
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Term
| Service water auto strainer backwash cycle. |
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Definition
| MO-2358 opens at 2.1 psid across strainer; closes at 0.9 psid. |
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Term
| Purpose of seal water system |
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Definition
| Designed to supply 48 gpm of well water (service water backup) filtered through a 50 micron filter to pump seals. |
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Term
| Purpose of Emergency Service Water |
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Definition
| "Provide cooling to EFT A/C condensers, ECCS pump motor oil coolers and ECCS room coolers under loss of off-site power and accident conditions." |
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Term
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Definition
| Provide cooling to EDGs which must operate under loss-of-station power and accident conditions. |
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Term
| Normal service water system line-up and capacities |
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Definition
| "Two pumps providing a total of 10,000 gpm at a discharge pressure of ~58 psig." |
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Term
| Winter operations of service water system |
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Definition
| One pump may be capable of supplying adequate cooling. |
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Term
| Service Water Pump low pressure setpoint |
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Definition
| 40 psig discharge pressure |
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Term
| Service Water Standby pump start sequence |
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Definition
| Standby pump will start when discharge pressure on running pump reaches 40 psig. |
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Term
| Indication that non-running pump is in standby |
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Definition
| White indicating light on C-06 |
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Term
| Service water discharge header automatic strainer operation. |
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Definition
| Continuous rotation of 4 rpm; Backwashed on a periodic basis to maintain dP across strainer drum between 0.9 and 2.1 psid (controlled by auto open/close of backwash control valve). |
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Term
| Purpose of seal water system anti-siphon device |
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Definition
| Prevents Well and domestic water system from being contaminated with river water if the service water system pressure becomes higher than WDW supply pressure. |
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Term
| Components sealed by seal water system |
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Definition
| Circ pumps; Cooling tower pumps; RHRSW pumps; Electric fire pumps; Diesel fire pump; screen wash/fire pump. |
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Term
| "Connection between Service water and ESW, EDG-ESW systems" |
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Definition
| Service water system supplies cooling to Emergency service water system and provides backup supply to EDG-ESW system. |
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Term
| Which service water components are monitored for radiation before it leaves the plant? |
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Definition
| "All service water from the building, except discharge from V-AC-6 RCIC room air cooler, MG Set oil coolers, and plant admin building ventilation and A/C units." |
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Term
| Which service water components are monitored by discharge canal sample radiation monitoring? |
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Definition
| "V-AC-6 discharge, MG Set oil coolers, plant admin HVAC." |
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Term
| Connection between Service water and the condenser/RPV. |
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Definition
| Service water can be aligned to supply emergency (RPV) makeup water to the hotwell. |
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Term
| "What effect does (physical) removal of a service pump have on EDG-ESW, ESW and RHRSW system piping seismic operability?" |
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Definition
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Term
| Auto strainer differential pressure operating parameters. |
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Definition
| Maintain below 2 psid by proper backwashing; Do not operate strainer if pressure exceeds 10 psid. |
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Term
| General precaution associated with service water pumps and their discharge valves. |
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Definition
| Do not operate service water pumps with discharge valve closed except for short times (less than 2 minutes) when starting and stopping requires valve to be closed. |
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Term
| Reason for closing discharge valve before stopping a service water pump. |
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Definition
| Prevent severe water hammer when check valve closes. |
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Term
| Service water pump starting limitations |
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Definition
| "Twice from ambient temperature and once from rated. For subsequent starts, 60 minutes idle time or 30 minutes running at full speed is required." |
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Term
| Emergency power supply to service water auto strainer |
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Definition
| Auto strainer has no emergency power supply. Therefore if the service water system is being run off the diesel generators during emergency conditions the bypass basket strainer must be valved in to service if the auto strainer dP rises above 5 psid. |
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Term
| Describe #12 service water pump's participation in the load rejection (load-shed) scheme. |
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Definition
| "On station loss of power coincident with initiation of ECCS, #12 service water pump will be included in the load rejection scheme so that when the diesel generators start they will carry only essential loads." |
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Term
| Describe # 11 service water pump's participation when #13 standby diesel is started. |
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Definition
| "On start of 13 Diesel, #11 service water pump will be included in the load shedding and its auto-start function will be disabled to avoid potential water hammer. However, the pump may be manually started, if desired, after 13 DG is running at steady state." |
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Term
| Control power to #11 Service water pump |
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Definition
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Term
| Control power to #12 Service water pump |
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Definition
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Term
| Control power to #13 Service water pump |
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Definition
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