ML20150B573

Preliminary Sys Description Nitrogen Pneumatic Sys

ML20150B573
Person / Time
Site:	Brunswick
Issue date:	03/10/1988
From:	CAROLINA POWER & LIGHT CO.
To:
Shared Package
ML20150B571	List: ML20150B568 ML20150B573
References
NUDOCS 8803170062
Download: ML20150B573 (14)

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I CAROLINA POWER & LIGHT COMPANY i

BRUNSWICK STEAM ELECTRIC PLANT UNIT 1 l

r SYSTEM DESCRIPTION

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j NITROGEN PNEUMATIC SYSTEM i

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88033700h

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PDR 310 ADOCp 05V00324 P

(2589NE L/ mss )

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PARAGRAPH PAGE l

i l.0 G ENERAL DESC RIPTION........................................ !

1.1 System Func t !ons.......................................... !

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'l.2 System Description........................................ 1 i

1.3 Component Descrip tion.................................... 1 i

1.3.1 C ryogenic Tank................,.................... !

l.3.2 Ambient Vaporizers................................ 2 i

1.3.4 Unit Crosstle Valve................................. 2 e

1.3.5 Tank Fill Station................................... 2 2.0 INSTRUMENTATION AND CONTROL............................ 2 2.1 De s i g n Ba s is.............................................. 2 2.2 Functional and Operational Control.......................... 2 t

l 2.2.1 Cryogenic Tank Control............................. 2 2.2.2 Ambient Vaporizers................................ 2

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2.2.3 Pressure-Regulating Valves.......................... 3 2.2.4 Unit Crosstle Valve................................. 3 i

2.2.5 Annunc ia t o rs...................................... 3 l

l 2.3 Monitoring Instrumentation................................. 3 2.4 Instrument and Control Setpoints............................ 4 l

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3.0 SYSTEM AND COMPONENT DESIGN PARAMETERS............... 4 t

3.1 System Design Data....................................... 4 j

3.2 Component Design Da ta.................................... 5 i

3.2.1 C ryoge nic Tank.................................... 5 4

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j 3.2.2 Ambient Vaporizers................................ 5 l

l 3.2.3 Re f uel Valve s...................................... 5 f

I 3.2.4 Pressure Control Valves............................. 5 i

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i 4.0 SYST EM D ESIG N D AT A......................................... 6 i

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P ge1 1.0 General Description 1.1 System Functions The Nitrogen Pneumatic System provides gaseous nitrogen which is dry, oil-free, and free of foreign materials to pneumatically operated instruments and controls in the primary containment.

1.2 System Description

The gaseous nitrogen for the Nitrogen Pneumatic System is provided from cryogenic tanks located in the yard area southeast of the Unit 2 Reactor Building. The tanks are located on an east-west line with the Unit 1 tank on the east end. Liquid Nitrogen is converted to gaseous nitrogen by the ambient vaporizers. Two 200% vaporizers are provided with each cryogenic tank system.

Two parallel pressure-regulating valves are provided downstream of the ambient vaporizers for improved reliability. A single pipe run is provided from the pressure regulator valves to the Reactor Building for Unit 1. At the southeast corner of the Reactor Building, the line tees to Teed the Division I and Division 11 headers of the Reactor Building. The Nitrogen Pneumatic System supplies the following control systems:

A.

Main Steam isolation Valves B.

Safety Relief Valves C.

Reactor Building Closed Cooling Water Flow Centrol Valves D.

Reactor Recirculation E.

Suppression Chamber Yacuum Breaker Valves in-line strainers are provided for each nitrogen line upstream of each pressure regulating valve.

The Nitrogen Pneumatic System is utilized during power operation, and it eliminates the introduction of oxygen into the drywe!! due to the operation of pneumatic controls.

The Nitrogen Pneumatic System may be isolated during outages to permit use of the non-interruptible instrument air while plant personnel are working and entering the drywell.

.The Unit I and Unit 2 Nitrogen Pneumatic Systems are crosstled immediately downstream of the ambient vaporizers but upstream of the pressure-reducing i

valves. This provides a nitrogen source backup for the two systems.

1.3 Component Description 1.3.1 Cryogenic Tank j

The vertical cryogenic tank has a useable storage capacity of 11,000 gallons of liguld nitrogen. The tank serves to store Itquid nitrogen as well as provide the driving pressure for the system. The tank is to maintain the liquid nitrogen at 150 psig with a liquid nitrogen temperature of -350*F.

(2589tdL/ ass)

Pcge 2 1.3.2 Ambient Vaporizers The ambient va rizers are sized for delivery of 80 scfm of gaseous nitrogen at ISO

. The ambient vaporizers operate on an approach temperature wi 20' of ambient. Two ambient vaporizers are provided. One is normally valved out as standby. Each vaporizer is 200% capacity to permit it to supply two systems (both Unit I and Unit 2 simultaneously).

The vaporizer's isolation valves will automatically close on low vaporizer outlet temperature. This prevents passage of !! quid nitrogen into the piping downstream of the vaporizers. This is a self-regulating temperature control valve.

1.3.3 Pressure Regulating Valves The pressure regulating valves will maintain the nitrogen lines at 110 psig at the regulator valve outlet. The valves are self-regulating on downstream pressure.

1.3.4 Unit Crosstle Valve This valve is normally closed. The valve position is controlled from the control room by control switches. A control switch is provided for each RTGB.

1.3.3 Tank Fill Station The Tank Fill Station is located adjacent to the tank.

2.0 INSTRUMENTATION AND CONTROL 2.1 Design Basis The Nitrogen Pneumatic System is designed with the capability of supplying all the nitrogen needed to operate the instrumentation and pneumatic controls en the RNA headers in the drywell. The system is designed to operate automatically requiring a minimum of operator attention.

2.2 Functional and Operational Control 2.2.1 Cryogenic Tank Controls The cryogenic tank regulation controls. pressure is maintained by the tank's pressureAs nee pressure. An economizer system is used to ensure this gas is utilized by the pneumatic system feeding the drywell rather than dumping the tank boil off to atmosphere.

The tank is protected from extreme overpressure by a safety relief valve and rupture disc.

An alarm in the control room signals low tank pressure. Local and control raom indication is proviced for tank level and pressure.

2.2.2 Ambient vaporizers Since the vaporizers have no moving parts, no controls are required.

Radiant and convective heat transfer to the environment ensure boil off of the liquid nitrogen in the vaporizer.

(2589NE L/sss )

Page 3 To prevent passing Il ;ld nitrogen, the vaporizer is automatically 7

isolated by low vaportzer outlet temperature.

Control room and local Indication of the vapor!zer outlet temperature are provided. Vaporizer outlet temperature is alarmed for a low setpoint.

2.2.3 Pressure Regulating Valves The valve is self-regulating based on the downstream pressure. The rise in downstream pressure will cause the valve to c!cse as the pressure is satisfied.

Local indication of the downstream pressure is provided at pressure 4

regulating valves.

2.2.4 Unit Crosstle Valve The unit crosstle valve will be normally closed. Upon loss of a storage tank the remaining tank will be used to supply both units with nitrogen.

The control room operator can open or close the crosstle valve from the control room by an override switch.

Until the Unit 2 Nitrogen Pneumatic System is operational, the crosstle valve vill be open at a!! times. This is necessary to utilize the normal boll-off of the Unit 2 tank.

2.2.5 Annunciators The following are annunciators associated with the Nitrogen Pneumatic System:

Annunciator Unit (s)

Annunciator Panel No Cryogenic Tank 1 Pressure Low 1

Later Cryogenic Tank 2 Pressure Low 2

Later vaportzer Outlet Temp. Low and 2 Later Nitrogen Header Pressure Low 1

Later l

Division !

Nitrogen Header Pressure Low 1

(Later)

Division !!

2.3 Monitoring Instrumentation Table 2.3.1 is a table of instrumentation that provides monitoring functions for the safe operation of this system. Instruments ilsted in this section that also provide tnp functions are again listed in Section 2.4, Instrument and

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Control Setpoints.

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4 (2sS9NE L/sss )

Page 4 TABLE 2.3.1 MONITORING INSTRUMENTATION Instrument Indicator / Recorder Function Designation Location Cryogenic Tank i Pressure (Later)

RTGB Cryogenic Tank 2 Pressure (Later)

RTGB Vapori::er Outlet Temp. Unit 1 (Later)

RTGB Vaporizer Outlet Temp. Unit 2 (Later)

RTGB Nitrogen Header Press. Division I (Later)

RTGB Nitrogen Header Press. Division II (Later)

RTGB Cryogenic Tank 1 Pressure Low (Later)

XU Cryogenic Tank 2 Pressure Low (Later)

XU Vaporizer Outlet Temp. Low Unit 1 (Later)

XU Vaporizer Outlet Temp. Low Unit 2 (Later)

XU Nitrogen Header Press. Low Division I (Later)

XU Nitrogen Header Press. Low Division II (Later)

XU Cryogenic Tank 1 Pressure (Later)

Local Cryogenic Tank 2 Pressure (Later)

Local Cryogenic Tank I Level (Luter)

Local Cryogenic Tank 2 Level (Later)

Local Cryogenic Tank I Level (Later)

RTGB Cryogenic Tank 2 Level (Later)

RTGB Vaporizer Outlet Temp. Unit 1 (Later)

Local Vaporizer Outlet Temp. Unit 2 (Later)

Local PCV Outlet Pressure (Unit 1)

(Later)

Local PCV Outlet Pressure (Unit 2)

(Later)

Local 2.4 Instrument and Control Setpoints Table 2.4.1 is a list of all instrumentation that provides trip functions.

TABLE 2.4.1 Instrument and Control Setpoints Nitrogen Pneumatic System Inst.

Trip Setpoint and Instrument Trip Function Designations Function Cryogenic Tank 1 Pressure Low (Later) 140 psig decreasing Cryogenic Tank 2 Pressure Low (Later) 140 psig decreasing Vaporizer Outlet Temp. Low Unit 1 (Later)

-10*F decreasing l

Vaporizer Outlet Temp. Low Unit 2 (Later)

-10*F decreasing Nitrogen Header Press. Low Division I (Later) 95 psig decreasing Nitrogen Header Press. Low Division II (Later) 95 psig decreasing 3.0 SYSTEM AND COMPONENT DESIGN PfaAMETERS 3.1 System Design Data Nitrogen Output 40 SCFM, moisture-free, no particulates at each interface (2589NEL/ mss) 1

Page5 location 3.2 Component Design Data 3.2.1 Cryogenic Tank Type Vertical Capacity 11,000 Gallons Media Liquid Nitrogen Design Pressure 250 psig Temperature

-350*F Average Time between refuel 7 days Tank Refuel Level 3,500 Gallons Manufacturer (Later)

Diameter / Length 8'-8"/39'-6 t" Shell Thickness 1/4 inches Head Thickness 1/4 inches 3.2.2 Ambient Vaporizer Type (Later)

Capacity 80 SCFM Operation Ambient Temp. Difference Design Pressure 235 psig Fin Material Aluminum 3.2.3 Relief Valves Valves Setpoints Cryogenic Tank 1 Relief valve 175 psig Cryogenic Tank 2 Relief valve 175 psig 3.2.4 Pressure Control Valves Valve Setpoint Press. Control Valve A 110 psig (Unit 1)

Press. Control Valve B 110 psig (Unit 1)

Press. Control Valve A 110 psig (Unit 2)

Press. Control Valve B 110 psig (Unit 2) i (2589NE L/ms s )

Pag 2 6 3

4.0 SYSTEM DESIGN DATA The Nitrogen Pneumatic System is designed with the capability of supplying all nitrogen requirements in the drywell required for plant safety. The Nitrogen Backup System provides an independent pneumatic source of bottled nitrogen to selected safety-related loads in the drywell in the event of either a LOCA or the-loss of the Nitrogen Pneumatic System. During a LOCA, the Nitrogen Pneumatic System to the drywell is isolated and the Nitrogen Backup System is used. The control operator may override the Nitrogen Pneumatic System isolation and open the isolation valves by control switch.

The Nitrogen Pneumcic System is designed to operate during any design basis event and is designed to Class I Seismic requirements. (Applicable to portions of the system inside the Reactor Building.)

The piping system was designed in accordance with the Power Piping-Code, American National Standards Institute (ANSO B31.1.0-1967. The cryogenic tank system piping was designed in accordance with the Petroleum Refinery Piping Code, ANSI B31.3.0. The cryogenic tank was designed in accordance with ASME Section VIII, Division 1, Boiler and Pressure Vessel Code. Due to system leakage, and operation discharge in the drywell; the drywell will require atmosphere pressure adjustments on an estimated three-day basis.

Fencing with lockable gate is provided around the storage tank facility to prevent tampering with the system controls.

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