ML19221A427

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TMI-2 Sys Criteria for Use of Steam Generator B for Cooldown at High Pressure, Revision 3
ML19221A427
Person / Time
Site: Crane 
Issue date: 04/24/1979
From:
GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML19221A425 List:
References
NUDOCS 7905230008
Download: ML19221A427 (9)
v • d • e


Text

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t THREE kILE ISLAND UNIT 2 SYSTEM CRITERIA FOR USE OF STEAM GENERATOR "B" FOR COOLDO'JN AT HIGH TRESSURE (REV 3) e'.

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162 198 F*,

INDEX 1.0 Systees Criteria 2.0 Functional Performance Requirements 3.0 Applicable Codes and Standards 4.0 Design Basis a

5.0 Sizing Requirements 6.0 Layout Requirements 7.0 Environmental Requirements 8.0 Sampling Requirements 9.0 Material Requirements 10.0 Electrical Require =ents e

l'1. 0 Testing Requirements 12.0 Instr umentativu and Control Require = cats 13.0'

'w'ater Chemistry O

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e 162 199

THREE KILE ISLAND UNIT 2_

System Criteria for Use of Steam Cenerator "B" for Cooldown at High Pressure 10 SYSTEMS CRITERIA This document defines the design criteria for providing for water to water cooling in steam generator "B" to remove decay heat on a long term basis.

2.0 FUNCTICNAL PERFORMANCE REQUIREMENTS Recirculation of high pressure closed cycle cooling water thru the secondary side of the steam generators for removal of decay heat from the primary coolant.

The ultimate heat sink shall be river water.

Intermediate cooling is provided by the secondary services closed cooling water system.

3.0 APPLICABLE CODES AND STANDARDS Piping

-ANSI B31.1 Heat Exchangers

-ASME Section VIII Tanks

-ASME Section VIII Pumps 8

-Rydraulic Institute Standards Valves

-ANSI B16.5, B16.34 1;ot e : ASME Section III components will be utilized when available.

4.0 DESIGN BASIS 4.1 The system may be designed as non-seismic category I.

4.2 The system shall be designed for long term centinuous cooling for a minimum of two years.

4.3 The system shall be desigacd to operate with a loss of off-site power.

4.4 The system shall include a surge tank to accommodate changes in fluid volume and temperature in the closed loop.

Surge volumes shall be adequate to prevent liquid or gaseous releases during system transients and startup.

4.5 The system shall have the capability to regulate the te=perature and flow rate of cooling water entering the steam generator.

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162 200 WP

t 4.6 The system shall have the capability to preheat the feedwater to 160-180 F at flow up to 50 CPM during the filling of the steam generator.

4.7 The system shall operate independently of any cooling system for steam generator "A" to the extent that sinr.le active ~

f ailures vill not preclude cooling of the primary system.

4.8 The system shall be equippt with sufficient test and instrumentation connections for system preoperational 'esting and normal operation.

4.9 The systcm shall be designed to supply cooled water to the steam

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generator through the main feedwater nozzle and receive heated water through the main steam nozzle.

4.10 The system design shall employ all velded connections to the greatest extent possible to minimize system Icakage.

4.11 The system shall include provisions for future addition of auto-matic controls and alarms without interruption of system function.

4.12 The system design shall maintain containment integrity.

4.13 The system design shall provide means for monitoring and controlling cooling water chemistry requirements as specified in Section 13.

4.14 The system design shall minimize dependence on auxiliary support systems (bearing cooling vater, lubrication oil, instrument air).

Loss of instrument air shall not change the operating parameters (flov and temperature) of the system.

o 4.15 The systec pressure shall always be maintained at a pressure higher than the primary coolant pressure so there vill be no leakage of primary water into the closed cooling system.

4.16 The system shall be designed to remove the required heat load with_.

I the,ariations in the te=perature of the ultimate heat sink shown in Section 5.1.

4.17 This systen shall have provisions for installation of a future water purificat.lon system

';ith capability (discharge and shielding) to handle radioactive resin.

Installation and startup of this equipment shall not interrupt sys t em f unction.

4.18 The system shall be provided with proper overpressure relief devices.

The discharge from overpressure relief devices shall be piped so :

o minimize the spreading of contaminated fluids.

Surge tank rc_.ief valve (s) shall be sized to protect against failures of the makeup or blanketing gas valves as applicable.

4.19 Relicf alve shall also be capable of relieving the water expansion in the acconuary side of the steam generator should the cooling water flov be lost.

The =2xi=um heatup rate is 50 F/Hr.

The system shall have proper connections, pu=p suction strainer, and other provisions for flushing of n6v piping and components prior to startup.

New piping and co=ponents shall be in a clean and neutralized state when installed.

Chemical cleaning shall not be used after installation.

4 162 201

4.20 The cooling water syste=s f or sten = generator "B" shall be isolated f rom the steam generator "A" cooling water systc=s on both sides of the new heat exchanger.

4.12 The syste= shall be checked for correct valve align =ent.

Those iteus which could interfere with the proper function of the syste=

shall be locked out.

Vents and drains shall be provided.

4.22 Provision shall be made to hold up any system leakage or drainage (on feedwater and SSCCW sides) prior to release to uncontrolled drainage systems.

4.23 Provisions shall be made to make small incre= ental changes in feedwater flow (! 25 gpm) to the steam generator and.to reduce total flow to a maximum of 10-50 gpm during filling.

4.24 The system shall have provisions for rdtrogen addition during fill of the steam generator if required.

4.25 Provisions shall be mede to manually supply makeup at system pressure without interruption of system operation.

Demand shall be indicated by a low level alarm on the surge tank.

4.26 A recirculation line to meet the minicum flow requirements of the pu=p shall be provided.

e' Loss of system function shall be alarred in the ccatrol room.

427 5.0 SIZING REQUIREMENTS 5.1 The syste= shall be designed to rect the following requirerents:

(a) flow through steam generator 3000 to 5000 gpm (b) steam generator inlet te=perature 800F (c) steam generator outlet te=perature 800F-2500F (d) design pressure 650 psi (e) river water temperatures 34 to 850F (f) river water flow rate as required to rc=ove heat load 6

(g)' heat exchanger duty 30.x 10 Bru/hr.(includes heat from 1 RC Pump) 6.0 1.AYOUT REQUIREMENTS 6.1 The cystem equip =ent shall be located to facilitate construction and future modifications, and case the accesa during operation.

6.2 The syste= flow path shall consist of cooled water entering the steam generator through the main feedwater no::le exiting the steam generator through a main stca: line, entering the new heat exchanger (cooler), and returning to the steam generator using the new system pu=p.

162 202

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10.8 Electrical load list (to be c on f i r=e d) :

Load Ep Voltage Source a) PGE Decay Heat Pu=p/WPPS 700 4000 Bus 2-4 b) Nuclear Services River 400 4000 Bus 2-4E Water Pu=p NR-P-1C or ID c) Secondary Services Closed 200 460 Bus 2-41B Cooling Water Pu=p SC-P-1B or 1C 10.9 " Criteria for Cencral Modification to the BCP Electrical Syste="

are applicable.

Also refer to " Criteria for Loss of Off-Site BOP Electrical Power."

11.0 ESTING REQUIREMENTS Provisions shall be made for preoperat2onal testing of the syste=,

including hydrostatic tests and flushing of new piping.

Flanges shall be provided at the new pump suction and discharge to' isolate the pu=p during system hydrostatic testing if required to protect t? e pu=p seals.

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12.0 INSTRUENTATION AND CONTROL REQUIREMENTS,

12.1 The sy stem shall be designed to p'rovide' instrumentation sufficient to =6,nitor f unctional perf or=ance requirements including:

(a) pu=p discharge pressure, 0-800 psig (b) stca: generator inlet and outlet te=perstures, 50-250 F (c) flow rate, nominally 3000 gpe, =axi=um 5000 gpm (d) river water inlet and outlet te=peratures, 0-100 F (e) surge tank high and low indication and alar:s 12.2 Critical instru=entation shall be duplicated, specifically,indepen-dent sensors and indicators for steam generator inlet and outlet temperatures and system flow rate.

12.3 Area radiation monitoring shall be provided where the eculp=ent and co=ponents are installed.

12.4 The attsched list of instrumentation shall be operable when the system is placed in service.

12.5 Instru=ents, including power supply, shall be independent from

.instrc=catation f or ste a= gene rator "A".

Instruments shall be supplied frc= an even-nu=bered plant instru=ent bus.

If availabic, uninterruptible power shall be used.

12.6 Control circuits for existing equip =ent shall be reviewed to ensure that no spurious autc=atic, anual, or interlock signals will cause incorrect operation of the system.

Specifically, all auto =atic EEergency f eedwater actuation signals shall be def eated and all auto =atic control signals to the feedwater control valves shall be disabled.

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12.7 Provisiens shall be made fer locating controls and remote indicators in the Unic 2 control room (future).

12.8 Controls and indicators are to be segregated f rom those for sten:

generator "A" using a separate panel or a separate section of a

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co= mon panel.

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12.9 Control stall be anual.

Run/off/ trip indicator lights shall be provided for motor 1; open/close/ trip lights shall be provided for valves.

12.10 Control cables should have 50%, and preferable 100%,

to allow for future modifications..

12.11 Radiation monitoring and alares shall be provided at the outlet of the steam generator and at the secondary services closed coolir.g vater outlec of the new heat exchanger.

The conitors shall be capable of detecting leakage f rom the reactor coolant system into the steam generator or the secondary services closed ;ooling water systet.

12.12 Thermowells capable of using mercury glass the rmometers shall be provided_

as close as practical to th e steam generator inlet and outlet.

13.0

!!ATEk CHEMISTRY

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13.1,* The system water cht=istry for the steam generator shall bc

=aintained in accordance with the f ollowing:

(a) pH @ 77 F 9.3-10.5 (controlled by NH OH addition 1 (b) 02 dissolved 100 ppb Max. 2 (OTSG 300 F)4 (c)

Cation conductivity 10 u=ho / cm, Max (d)

Hydrazine At least 300% of stoichiometric 0 2

concentration 13.2 The makeup and fill water chemistry for the steam generator shall be in accordance with the following:

02 dissolved 100 ppb Max j

Cation conductivity 1 u=ho / cm kax(OTSC 300 F)

  • 13.3 Means shall be provided to add a=monia hydroxide and hydrazine to the syste= associated with the steam generator.

The che=ical addition point shall be downstream of the future water purification f

system.

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