ML19308C159
| ML19308C159 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/28/1976 |
| From: | Iskyan H BURNS & ROE CO. |
| To: | |
| References | |
| TASK-TF, TASK-TMR PROC-760228-01, NUDOCS 8001210492 | |
| Download: ML19308C159 (38) | |
Text
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SYSTEM DESCRIPTION (Index No. 21)
RADWASTE DISPOSAL, REACTOR COOLANT-LIQUID (B&R Dwg. No. 2027, Rev. 16)
JERSEY CENTRAL POWER & LIGHT COMPANYI THREE MILE ISLAND NUCLEAR STATION UNIT NO. 2 Issue Date:
February, 1976 Prepared by:
H.
Iskyan Burns and Roe, Inc.
700 Kinderkamack Road Oradell, N.J.
07649 0001210 1
TABLE OF CONTENTS FOR RADWASTE DISPOSAL, REACTOR COOLANT-LIQUID Section Page
1.0 INTRODUCTION
1 l.1 System Functions 1
1.2 Summary Description of the System 2
1.3 System Design Requirements 5
2.0 DETAILED DESCRIPTION OF SYSTEM 7~
2.1 Components 7
2.2 Instruments, controls, Alarms and 19 Protective Devices 3.0 PRINCIPAL MODES OF OPERATION 22 3.1 Startup 22 3.2 Normal Operation 22 3.3 Shutdown 2 'A 3.4 Special or Infrequent Operation 28 '-
3.5 Emergency 28 4.0 HAZARDS AND PRECAUTIONS 28 e
w
APPENDIX TITLE TABLE NO.
Reactor Coolant Bleed Hold-Up Tanks 1
Evaporator Condensate Test Tanks 2
Reactor Coolant Drain Pump 3
Waste Transfer Pumps 4
Evaporator Condensate Pumps 5
Reactor Coolant Evaporator 6
Major System Valves 7
Instrumentation and Controls 8
Panel Mounted Annunciators 9
Computer Inputs 10 t
~
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RADWASTE DISPOSAL -
REACTOR COOLANT LIQUID SYSTEM
1.0 INTRODUCTION
1.1 System Functions The functions of the Radwaste Disposal - Reactor Coolant Liquid System are:
a.
Boron removal from Reactor Coolant for reactivity control b.
Collection of all Reactor Coolant wastes c.
Hold-up storage of Reactor Coolant to allow decay, d.
Process Reactor Coolant liquid by ion exchange to remove corrosion and fission products so that its radioactivity level will be as low as practicable.
e.
Redundant sampling and monitoring of the Reactor coolant liquid before discharging it.
f.
Controlled discharge of the Reactor Coolant liquid waste.
g.
Recovery of boric acid by evaporation.
h.
Volume reduction of the radioactive liquid waste by evaporation.
. i.
Stripping of radioactive gases, j.
Venting of gases to Waste Gas System.
k.
Transfer of concentrated wastes for disposal.
The Reactor Ccolant Liquid Waste Disposal System has inter-l faces with the folicwing systems.
(Drawing numbers refer
to Burns and Ron, Inc. flow diagrams):
a.
Reactor Coolant Make-Up and Purification (Dwg. No. 2024). ~
b.
Demineralized Service Water (Dwg. No. 2007).
c.
Radwaste Disposal-Miscellaneous Liquids (Dwg. No. 2045) d.
Reactor Building Emergency Spray and Core Flooding (Dwg. No. 2034).
e.
Spent Fuel Cooling (Dwg. No. 2026) f.
Steam Generator Secondary Side Vents and Drains s
(Dwg. No. 2414) g.
Radwaste Disposal-Solid (Dwg. No. 2039) h.
Circulating and secondary Services Water (Dwg. No. 2023) i.
Make-Up Water Treatment and Condensate Polishing (Dwg. No. 2006) j.
Radwaste Disposal - Gas (Dwg. No. 2028) k.
Sampling - Nuclear System (Dwg. No. 2031) 1.
Radwaste Pumps Seal Water (Dwg. No. 2496)
Nitrogen for Nuclear and Radwaste Systems (Dwg. No. 2036) m.
n.
Auxiliary Steam (Dwg. 2004) o.
Nuclear Services Closed Cooling Water (Dwg. 2030) p.
Instrument Air (Dwg. 2012).
q.
Radwaste Disposal Reactor Coolant Leakage Recovery (Dwg. 2632).
1.2 Summarv Description of the System (Refer to B&R Dwg. No. 2027, Rev. 16
-' As the uranium fuel is consumed with core burnup, the concentration of boron in the reactor coolant is reduced.
Initially the concentration is reduced by simultaneously bleeding highly borated reactor coolant and feeding non-borated coolant into the reactor loops.
The highly borated coolant is stored in one of the three Reactor Coolant Bleed s
2
+
e Holdup Tanks.
The nonborated water is feed into the suction of the Makeup Pumps where is it injected into the reactor loops. After the boron concentration has been reduced to 190 ppm by feed and bleed:, deboration is accomplished by diverting borated water from the Makeup System through the Deborating Demineralizers.
After deboration, the deborated water goes to the suction of the Makeup Pumps where it is injected into the Core.
Feed and Bleed operations are controlled from the Feed and Bleed Panel No. 9 located in the Control Room.
Additional information on feed and bleed operations are described in the Reactor Coolant Make-Up and Purification System Description (Index No. 17) and the Babcock and Wilcox Plant Operations Manual (7.00)
The Reactor Coolant Bleed Hold-Up Tanks collect liquid from the following sources:
a.
Letdown Line Relief Valve Drain.
b.
Distillate from Unit #1 Miscellaneous Waste Evaporator.
c.
Core Flooding Tank Bleed.
d.
Reactor Coolant Evaporator Distillate.
e.
Make-Up Tank Drain.
f.
Reactor Coolant Letdown Bleed.
g.
Spent Fuel Cooling System Purification Loop h.
Reactor Coolant Drain Header.
i.
Evaporator Condensate Test Tanks.
j.
Reactor Coolant Drain Tank The Reactor Coolant Drain Header receives liquid from the followi5g sources:
a.
Reactor Coolant Drain Tank (One Line).
b.
Core Flooding Tank Drains (Two Lines).
n w
c.
Pressurizer Drain (Ono Line).
d.
Reactor Coolant Loop Drains (Four Lines) e.
Steam Generator Secondary Side Vents and Drains (One Line),
f.
Steam Generator Drains (Two Lines).
g.
Decay Heat Line Drains (Three Lines).
h.
Core Flooding Line Drains (Three Lines)
The Reactor Coolant Drain Pump takes suction from the drain s
The pump has a low suction pressure interlocked to prevent damage.
The Reactor Coolant Bleed Hold-Up Tanks collect primary coolant liquid wastes.
Before removal from the Bleed Hold-Up Tanks, the contents are recirculated to obtain a representative sample for determining disposition of the liquid.
The Reactor Coolant Evaporator is used to concentrate non-volatile radioactive liquid and boric acid.
The concentrated liquid is transferred either to the Conenetrated Wante Tank for disposal or to the Reclaimed Boric Acid Tank for reuse.
The volatile and non-condensable gases are removed by a gas stripper and directed to the Waste' Gas System.
The 1
distillate is either pumped through the Evaporator Conden-
, sate Demineralizers to the Evaporator Condensate Test Tanks, or it is returned to a Reactor Coolant Bleed Hold-Up tank for storage.
The Evaporator Condensate Demineralizers are provided to further 7emove baron or radioactivity, Whenever an Evaporator j
~
Condensate Test Tank is filled, it is isolated from the sys-tem and its contents and recirculated for sampling.
If the radioactivity level or pH is not Jcceptable, the liquid is _
gccycled through the Evaporator Condensato Demineralizars.
If the same is determined acceptable for release, the tank contents are pumped to the Mechanical Draft Cooling Tower for discharge.
A radioactivity monitor is located in the plant discharge line.
If a high radioactivity level is detected, a signal automatically closes two discharge valves in series and shuts down the Evaporator Condensate Pumps.
1.3 System Desian Requirements The system is designed to prevent unacceptable radioactivity from being released to the environment.
The design requirements for the Radwaste Disposal-Reactor Coolant Liquid System are divided into the categories listed below:
a.
Deborating functions b.
Waste Disposal functions c.
Equipment specifications A.
Deboratino Functions The Radwaste Disposal - Reactor Coolant Liquid System is designed to remove boron from the Primary Coolant in two ways.
The boron concentration can be reduced to approximately 190 ppm through the feed and bleed method.
To further reduce the boron concentration, the Deborating Demineralizers are used to reduce the loop concentration from 190 ppm to 17 ppm.
During this deboration one Demineralizer will be completely exhausted and the second will be in use.
~
I -,
The combined retention of both demineralizers is 94 lbs.
of boron.
The beds will maintain this capacity for five(5) in-place regenerations or three (3) years of service life.
t B.
Waste Disposal Functions The Reactor Coolant Liquid Waste Disposal System is also designed to remove radioactive substances that might be introduced to the Reactor Coolant.
The system is capable of removing an amount radioactivity equivalent to that which would be introduced into the coolant if 1% of the fuel failed.
The following design requirements are pro-vided to prevent the release of unacceptable radioactivity to the environment.
a.
Redundant sampling and monitoring of liquid.
b.
Release of liquid only by positive operator action.
c.
Monitor in discharge line which automatically activates an alarm and shuts down the system if unacceptable radio-activity is detected.
d.
High dilution before being discharged to the river.
The Reactor Coolant Bleed Hold-Up Tanks have a combined capacity of 33,000 ft3 This capacity exceeds the handling volume of reactor water from two back-to-back startups from cold shutdown.
- The design maximum annual liquid handling by the system is assumed to be:
Waste Source Quantity (gal /yr.)
Comments Startup Expansion 128,000 4 cold startups Startup-Dilution 88,000 2 cold startups at beginning of life and 1 cold startup at 100 and 200 full power days.
I
( i l
t
Waste Source Quantity (cal /yr.)
Comments Deborating 172,000 Dilution from 1460 ppm initial criticality-to 190 ppm boron 110,000 Dilutiod from 1070 ppm to 190 ppm boren(sub-sequent fuel loadings).
C.
Equipment Specifications General equipment design specifications are listed below:
l.
Tanks and pumps - ASME Boiler and Pressure Vessel Code 1968 Section III-C or Section VIII (depending on the radio-activity level of the fluid).
See Tables 1-6.
2.
Valves and Pumps
" Draft ASME Code for Pumps and Valves for Nuclear Power",Section III, Class C.
3.
Piping - ANSI B31.7,0, N-3.
l 4.
Welding - ASME Boiler and Pressure Vessel Code,Section IX.
2.0 DETAILED DESCRIPTION OF SYSTEM 2.1 Components 2.1.1 Reactor Coolant Drain Tank:
WDL-T-3 The Tank absorbs blowdown from the Pressurizer relief valves, and receives and measures leakage from the RC Pump Seals and RC valves.
The discharge from the tank is pumped through a cooler to the Reactor Coolant Bleed Holdup Tanks.
The Reactor
. Coolant Drain tank is normally n.'trogen blanketed and vented to the Holdup Tanks.
The RC Drain Tank, and its associated pumps, va'.ves and heat exchanges are discussed in the Reactor Coolaat Drain System Description (Index No. 64).
. '* ~
d 2.1.2 Reactor Coolant Bleed Hold-Uo Tanks WDL-T-1A, WDL-T-1B, WDL-T-lc The purpose of the three Reactor Coolant Bleed Hold-Up Tanks (Table 1) is to collect and hold up the Reactor Coolant liquid wastes.
Each tank has a capacity of 11,000 ft (80,000) gal. ).
Liquid entering a tank is sprayed through a sprayer at the top of the tank to allow the release of the entrained gases A nitrogen blanket-. of two (2) psig is maintained on the tanks to displace oxygen.
Nitrogen dilution pre-vents corrosion and keeps the hydrogen concentration below the explosion limit.
A pressure relief valve (WDL-R3A, WDL-R4A, WDL-R3B, WDL-R4B, WDL-R3C or WDL-R4C) automatically relieves the gas pressure to the Waste Gas Header when the pressure builds up.
When the liquid is pumped from one of the tanks, thus reducing the pressure in the tank, the nitrogen blanket is automatically replenished by opening of an automatic pressure controlled valve in the line connected to the Nitrogen System.
If the activity of the WDG Radwaste storage Tanks is low, the gas (mostly nitrogen) may be recycled by directing the gas to the Blc3d Holdup Tank.
During normal operation most of the Reactor Coolant Bleed Hold-Up Tank influent liquid is the Reactor Coolant Let-down Bleed.
However, the tanks receive liquid from several other sources as listed in Section 1.2.
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Redundant waste transfer pumps are provided to pump the liquid from the Reactor Coolant Bleed Hold-Up Tanks.
Remote controlled valves are used to select the flow path and regu-late flow.
This capability allows the pump to meet the flow rate requirements for the following discharges:
a.
Unit #1 Miscellaneous waste Evaporator - 12.5 gpm b.
Unit #2 Reactor Coolant Evaporator - 15 gpm c.
Clean-Up Demineralizers System - 100 gpm d.
Recirculation to Bleed Hold-Up Tanks O-to 100 gpm e.
Unit Discharge Line - O to 100 gpm f.
Return to Make-Up and Purification System - 45 gpm Before processing, the liquid is recirculated to obtain a representative sample.
The disposition of the liquid depends upon the results of the sample analysis.
The Reactor Coolant Bleed Ho.ld-Up Tanks are located in the Auxiliary Building and at an elevation of 280'-6".
2.1.3 Deborating Demineralizers WDL-K-1A, WDL-K-1B Two deborating demineralizers, piped in parallel, are used to reduce the boron concentration of the Reactor Coolant.
The resin is anion (OH) form, nuclear grade.
The boron concentration may be reduced below 190 ppm by putting one of the demineralizers in service.
(At higher baron con-
'centrations, the feed and bleed method is used).
The deborating demineralizer remains in service as long as the effluent quality is loss than 0.1 ppm baron.
Once the quality exceeds 0.1 ppm, the second unit is put in service.
The boron concentration of the Reactor Coolant is reduced until a lower limit of 17 ppm is reached.
This is the low-
_9_
est practical limit to ba obtained by ths use of the demineralizers.
The effluent liquid is then returned to the Makeup system upstream of the Makeup filters.
The Deborating Demineralizer's resin can be regenera ted in place.
A demineralized water line for backwash as well as a caustic inlet for regeneration are connected to the de-mineralizers.
The backwash outlet goes to the Miscellaneous waste Tank and the spent regenerant outlet goes to the Neutralizer Tanks of the Radwaste Disposal Miscellaneous Waste System.
The spent resin may also be sluiced to the Spent Resin Storage Tanks and replaced with new resin from the Resin Addition Tank.
A nitrogen line is connected to the demineralizers for the sluicing process.
The total regeneration and sluicing processes are done automatically.
For further information about the automatic processes see L*A Manual (38.00).
The demineralizers have vent lines going to the Waste Gas System.
The deborating Deminerali-zers have relief valves which discharge to the Auxiliary Building floor drain.
The effluent line of the Deminerali-zers has a connection leading to the sampling station.
When effluent quality limitations are not met, or the differential pressure across the demineralizer is high
. ~ (20 psid), the demiaeralizers may require regeneration and the standby unit put en the line.
If the limitations are quickly exceeded, the resin should be replaced.
The water effluent limits t.re 6-8 pH,
.1 ppm baron,
.1 ppm total solids (including dissolved and undissolved radioactive
~
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~=>=-v
=
o solids, not excluding H BO and Li OH) and conductivity 3
3 proportional to Li OH and H B0.
The resin will.also 3
3 be replaced when maximum activity limits are exceeded.
The Deborating Demineralizers are located in the Auxiliary Building at the elevation of 305'.
Their diameter is 60" and shell height 102".
They are made of 304 SS and are of seismic class I.
Their design pressure and temperature are s
150 psig and 200 F.
respectively.
2.1.4 Clean-Up Demineralizers WDL-K-2A, WDL-K-2B The two Clean-Up Demineralizers are provided to remove radioactive products from'the Liquid Radwaste.
The liquid is from the Reactor Coolant Bleed Hold-Up Tanks which has passed through the clean-up fitlers.
The effluent liquid passes through the clean-up after-filters and is recirculated to the Reactor Coolant Bleed Hold-Up Tanks or is directed to the Reactor Coolant Evaporator.
One of the Demineralizers is kept in service while the other acts as a standby unit.
The resins are mixed-bed, nuclear grade with a cation-to-anion volume ration of 1 to 3.
The resin has a high removal efficiency for corrosive particles and fission products.
The operating demineralizer should be removed from service,
. the standby demiceralizer put into operation, and the de-pleted resin replaced, if the Decontamination Factor is 10 or less for cesium or 100 for nonvolatile isotopes and iodine.
Other limits requiring resin replacement are 15 psid-across the demineralizer, effluent boron (2,270 ppm),
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g e
efflunnt chlorides (.1 ppm), efflurnt pH (6-8), effluent total solids (1.0 ppm including dissolved and undissolved radioactive solids but excluding H BO and LiOH), and 3
3 excessively high radiation levels in the demineralizer.
The spent resin is sluiced to the spent Resin Storage Tank and new resin is replaced from the Resin Addition Tank.
For sluicing purposes, the Demineralizers have a nitrogen and demineralized water inlet.
The sluicing process is completely automatic.
For "futher information about this process see L*A Manual (38.00).
For venting, the Clean-up Demineralizers have lines going to the Waste Gas System.
The Demineralizers have relief valves which discharge to the Auxiliary Building floor drain.
The effluent line of the Demineralizers has a connection leading to the sampling station.
Each demineralizer is provided with a 2" by-pass line and a manual valve used during plant start-up.
The inlet flow is controlled to a maximum of 30 gpm by a flow control valve.
The Clean-Up Demineralizers are located in the Auxiliary Building and at an elevation of 280'-6".
Their diameter is 30" and shell height 66".
They are made of 304 SS and are of seismic class I.
Their design temperature and pressure
'- are 200 F and 150 psig, respectively.
O M...
2.1.5 Reactor Coolant Evaporator WDL-Z-1 (Table 6)
The functions of the Reactor Coolant Evaporator are to:
a.
Concentrate the radioactive solution b.
Recover boron c.
Remove radioactive gases d.
Produce a low-radioactive high quality distillate.
s The influent liquid is pumped through the Cleal-Up Dem-ineralizers.
It can also come from the reclaimed Boric Acid Tank or the Evaporator Condensate Test Tanks.
The distillate is directed to the Evaporator Condensate'-Dem-ineralizers.
The concentrated liquids are pumped either to the Reclaimed Boric Acid Tank or to the Concentrated waste Tank.
Gases are removed from the influent by a gas stripper which is ven'ted to the vent header.
The Reactor Coolant Evaporator is composed of the systems listed below with their major components (Refer to AMF Beaird Dwg. 37.00-0133):
1.
Influent Feed Tank System a.
Feed Tank b.
Feed Tank Heating Coil c.
Feed Pumps (2) d.
Concentrate Discharge Pump (1)
^*
2.
Concentrator System a.
Heating Tube Bundle b.
Condensate Return System c.
Condensate Pump (1) d.
Condensing Tube Bundle
'e.
Demisters and Sieve Plates f.
Vacuum Pumps (2)
- _... _ _. - ~
3.
Gas Stripper Systrm a.
Reboiler b.
Gas Stripper Column c.
Gas Stripper Condenser d.
Gas Stripper Pumps (2) e.
Preheater f.
Gas Stripper Vacuum Pumps (2) 4.
Distillate Discharge System a.
Distillate Reservoir (36 gal.)
b.
Distillate Pumps (2) c.
Distillate Cooler The Feed Tank System influent liquid normally is from the Reactor Coolant Bleed Hold-Up Tanks, the Reclaimed Boric Acid Tank, or the Evaporator Condensate Test Tanks.
The flew is automatically controlled by the feed tank level.
Redundant feed pumps are provided to circulate the liquid between the concentrator and the feed. tank.
The concentra-tor eductor removes a preset amount of the concentrator bottoms for recirculation back to the feed tank.
When the boric acid concentration reaches 12%, the feed tank contents are pumped to the Reclaimed Boric Acid Tank by automatically valving the feed pump discharge.
If the Boric Acid is not to be recovered, the bottoms are sent to the Concentrated Waste Tank for disposal via Unit 1.
The Evaporator operates at a vacuum of approximately 20 inches of mercury and at a temperature of 160 F.
The evaporator feed from the feed tank flows over the heating tube bundle for evaporation.
Demisters and sieve plates are provided to remove the entrained boric acid and solid particles to the concentrator bottoms.
The vapor flows
- i MM
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M
over a condensing tubs bundle and the distillate is discharged through the gas stripper, where non-condensible vapors are removed and pumped to the Waste Gas System.
The concentrator bottoms are returned to the feed tank by the eductor.
The distillate reservoir receives the concentrator distillate.
Redundant distillate pumps are used to direct the liquid through the distillate cooler and through the Evaporator condensate Demineralizer to the Evaporator Condensate Test Tanks, or directly to the Bleed Hold-Up Tanks.
Approximately 10% of the liquid is returned to the concentrator as distillate reflux.
A conductivity cell is provided at the distillate reservoir.
If the purity does not meet the pre-set quality, a signal closes the distillate discharge line valve and opens the reject line to the feed tank.
When the.tigh conductivity signal has cleared the condensate is redirected to its normal discharge path to the Evaporator Demineralizer.
In addition to the Gas Sampling System, and the Auxiliary Building Sump which receives drainage, there are several other important support systems.
The Auxiliary Steam System provides heat to evaporate the process water.
Nuclear Ser-
. vice Closed Cooling Water cor.denses the evaporated steam.
The NSCCW supply valve, NS-V32, shuts with an ES Signal.
The WDG System receives noncoldensable gas.
Instrument Air controls many system components.
Demineralized water is used to ilush the concentrator, desuperheat incoming Auxil-iary S team, and as pump seal water.
Radwaste nitrogen is used to blanket the concentrator during a shutdown.
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For a more detailed description of the Reactor Coolant Evaporator, see vendor manual (37.00) by AMF Beaird, Inc.
The Reactor Coolant Evaporator is located in the Auxiliary Building and at an elevation of 280'-6".
It is seismic class I.
2.1. 6 Evacorator Condensate Deminera lizers WDL-K-3A, WDL-K-3B s
The Evaporator Condensate Demineralizers are provided to remove boron and radioactivity.
Normally, the distillate from the Reactor Coolant Evaporator is directed through one of the demineralizers to the Evaporator Condensate Test Tanks.
However, a valve, WDL-V134, which is controlled by a keylocked hand switch on the Radwaste Panel, 'is pro-vided so that the demineralizers can be bypassed.
The liquid in the test tanks can also be recirculated through the demineralizers.
One demineralizer is usually in service while the second
. acts as a standby.
However, they can be operated in either series or in " parallel".
A high differential pressure alarm is provided to indicate a clogged resin bed.
A sample point to the Nuclear Sampling System is provided to monitor demin-eralizer effluent quality.
The resins are mixed-bed, commer-cial grade, d-OH type with a cation / anion volume ratio of 1 to 3.
Each unit. is sized to process 85,000 gallons while maintain-ing an effluent quality of:
1.
pH - 6.5-7.5 at 77 F
~
2.
Total solids including dissolved and undissolved solids, but excluding H 0
and LiOH - less than 1.0 ppm 3
3 3.
Boric acid (H B03) as baron - less than 1.0 ppm 3
- l
~
Linns for nitrogen and demineralized water are connected to,the demineralizers for sluicing the exhausted resin to the spent Resin Storage Tank.
The demineralizer resin is replenished from the Resin Addition Tank The sluic-ing process is completely automatic.
For further informa-tion see L*A Manual (38.00).
valve WDL-V515 is used to vent the demineralizers to the atmosphere.
Valve WDL-R7A, discharging to the Auxiliary Building floor drain, servos as relief for demineralizer WDL-K-3A, and valve WDL-R7B serves the same purpose for demineralizer WDL-K-3B.
Resin traps are provided in the outlet lines of the demineralizers.
The resin traps drain to the Auxiliary Building floor drains.
The inlet lines (the recirculation and the one coming from the Reactor Coolant Evaporator) have connections to the sample station.
The maximum flow through each of the demineralizers is 20 gpm.
Their diameter is 30" and shell height 66".
They are of seismic class II.
They are made of 304 S.S.
and their design temperature and pressure are U
140 F and 150 psig, respectively.
The Evaporator Condensate Demineralizers are located in the Auxiliary Building at the elevation of 280'-6".
2.1.7 Evaporator Condensate Test Tanks WDL-T-9A, WDL-T-9B The two Evaporator Condensate Test Tanks (Table 2) collect
~
the effluent liquid of the Evaporator Condensate Deminerali-zers.
They provide hold-up storage to allow continuous operation of the Reactor Coolant Evaporator without dis-charging to the enviroment.
While one tank is being I
~
filled the contents of the other are recirculated to obtain a representative sample.
If the sample indicates the contents cannot be discharged to the environment, they
- i
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are recirculated through the Evaporator Condensat Demin eralizers or returned to a Bleed Hold-Up Tank for reproces sing.
If sampling indicates the pH radioactivity, and solids levels are satisfactory, the tank'r contents are pumped to the Mechanical Draft Cooling Tower for discharge Interlocks discussed in Section 2.2.1 prevent the discharge of high level radioactive wastes or the discharge of wast without high dilution.
es The tanks vent to t he atmosphere s
i The suction lines of the Evaporator Condensate Pump s can be drained to the Auxiliary Building sump.
i The, Evaporator Condensate Test Tanks are located in th Auxiliary Building at elevation 280'-6".
e 2.1.8 Reactor Coolant Drain Pumo, WDL-P-7 The Reactor Coolant Drain Pump (Table 3) is used to drain the Reactor Coolant System when the reactor i ing.
s not opert-The single stage centrifugal pump is rated at 100
\\
with a total dynamic head of SC ft.
gpm is on Panel 301B.
Control and indication The pump motor is powered from MCC 2-42A The pump is interlocked to stop with low sucti No seal water is required.
on pressure.
Building at elevation 282'-6".The pump is located in the React 2.1.9 Waste Trans fer Pumps WDL-P-5A, WDL-5B The Waste Transfer Pumps (Table 4) are used to discharge or recirculate the-contents of the Reactor Coolant Bl Hold-Up Tansk, WDL-T-1A, eed 1B, lc.
They are located on the 280'-6" level of the Auxiliary Building The single stage centrifugal pumps require no seal water.
They are rated at 100 gpm with a Total Dynamic Head of 150 ft. Control and I
h l - 1 i
indication is from Panel 301B and Panel 9.
Pumps WDL-P-5A and WDL-P-5B are powered from MCCs 2-3 2A and 2-42A, respec-tively.
Both pumps are normally in AUTO with only one pump running.
The idle pump will automatically start if the run-ning pump stops.
There is no low suction pressure trip, but an alarm will sound on Panel 3OlB with low pressure in either suction header, s
2.1.10 Evaoorator Condensate Pumos WDL-P-llA, WDL-P-llB The Evaporator Condensate Pumps (Table 5) recirculate liquid in the Evaporator Test Tanks or discharge liquid to the Mechanical Draft Cooling Towe.rs.
The Pumps are adjacent to the Evaporator Condensate Test Tank on the 280'-6" level of the Auxiliary Building.
The single stage centrifugal pumps i
are rated 50 gpm with 75 feet Total Dynamic Head.
There is no low suction pressure interlock, but an alarm will sound on Panel 3OlB with low pressure in either pump suction header.
Control and indication are also on Panel 301B.
The Pumps will stop on a high radiation signal in the plant dis-charge line.
Per se, there is no interlock to stop the pump on high radiation or high discharge flowrate to the Mechanical Draft Cooling Towers (MDCT).
However, the pumps discharge valve to the MDCT, WDL-V99, will shut if there is a hisa discharge flow or high radiation signal.
WDL-P-llA and
~ WDL-P-llB are powered from MCC 2-32A and 2-42A respectively.
2.1.11 Maior System Valves For a description of the major system valves, see Table 8.
2.2 Instrubents, Controls, Alarms, and Protective Devices 2.2.1 Instruments and Controls The Radwaste Disposal Reactor Coolant Liquid System has five l
puri 3 ; the Reactor Coolant Drain ~ Pump WDL-P-7, the Waste, _ ___
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Transfer pumps WDL-P-5A and WDL-5B, and the Evaporator Condensate Pumps WDL-P-llA and WDL-P-llB.
Each pump has discharge pressure instrumentation.
The Waste Transfer Pump has flow element and associated Differential Pressure Indicator.
The plant WDL Discharge Flow rate and total integral flow is indicated on Panel 301B.
All system pumps have indication and control on Panel 301B.
Additionally the Waste Transfer may be controlled from the Feed and Bleed.
Panel No. 9.
The Reactor Coolant Bleed Hold-Up Tanks and Evaporator Condensate Test Tanks are provided with level instuumentation.
The Reactor Coolant Bleed Hold-Up Tanks have temperature and pressure instrumentation.
All demineralizers and filters are provided with differential pressure instrumentation to alert the operator of a clogged condition.
With a Unit No. 2 high discharge WDL flowrate signal, the Evaporator Condensate Pumps (WDL-P-llA/B) will stop, their associated discharge valves (WDL-93/A/B) will shut.
The Unit discharge valve (WDL-V99) will shut, and the supply valve from the Neutralizer Tank Pumps (WDL-V100) will shut.
1 In order to open and remain open the Unit No. 2 discharge valve, WDL-v99, the following conditions must be met:
(1)
Unit No. 1 not discharging (Unit No. 1 discharge valve WDL-V257 closed).
(2)
Minimum flow to Unit No. 2 Mechanical Draft Cooling Towers (for dilution).
(3)
Unit No. 2 maximum WDL discharge flow rate not exceeded (4)
No high radiation signal from common Unit No.1/2 discharge (river water pit), and (5)
No high radiation signal in Unit No. 2 WDL discharge l
flow path.
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Flow to the Clean Up Demineralizers is controlled by inlet Flow Control Valve, WDL-V149.
The Evaporator Condensate l
(WDL-3A and 3B), Deboration (WDL-3A and 3B), and Clean Up Demineralizers (WDL-K-2A and 2B) have extensive control logic which automatically sluices out the exhausted resin and replaces it with new resin.
Deborating Demineralizers (WDL-K-1A and 1B) have controls to automatically regenerate 1
with caustic injection.
Additional discussion of interlocks, i
controls, and instrumentation associated with the Reactor Coolant Evaporator and Demineralizer are included in the AMF Beai i (37.00) and L*A Water (38.00) Manuals.
For additional information on the instrumentation and j
controls of the system, see Table 8.
2.2.2 Alarms and Computer Inputs For alarms and computer inputs, see Tables 9 and 10 respectively.
2.2.3 Protective Devices The Condensate Demineralizer Bypass,WPL-V-134,and the Dis-charge to the river, WDL-V99, both have key interlocks which require positive operator action to open Section 2.2.1 discusses some radiation safety interlocks.
Reactor Building isolation is provided to the Reactor Coolant Drain Header with an ES signal which shuts WDL-V1125 and WDL-V22, in the event of a LOCA.
The following components / headers are protected from over-pressure by relief valves.
Reactor Coolant Bleed Hold-Up Tanks (2; each)
Reactor Coolant Bleed Hold-Up Tanks Inlet Header (1)
Deborating Demineralizers (1 each)
Clean Up Demineralizers (1 each)
Evaporator Condensate Demineralizers (1 each)
The Reactor Coolant Drain Pump, WDL-P-7, will stop with low suction pressure.
3.0 PRINCIPAL MODES OF OPERATION 3.1 Startuo The startup of the Radwaste Disposal Reactor Coolant Liquid System requires lining up the proper valves (for the func-tion it is desired to perform) and startup of the appropriate pumps.
The pumps can be started from Radwaste Panel 3OlB, and the valves can be operated from Panel No. 15, Panel 301B, the Unit 2 Nuclear Sampling Panel, or locally.
Those support systems necessary for operation are referenced under that component in Section 2.1.
3.2 Normal Coeration The operation of the Radwaste Disposal -
Reactor Coolant Liquid System is dependent on reactor operation and the
. ~ quantity of the liquid handled.
Operations can be described as follows.
3.2.1 Deborating Demineralizers (Boron Dilution)
The deborating demineralizers are used to reduce the primary coolant's boron concentration when the concentration is 190 ppm or less.
This operation is automatic after the deminer-r eur 1
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alizers are put in service.
The path into the deborating demineralizers from the reactor coolant let-down bleed, is through 2-1/2" valves WDL-V45, and WDL-V81A or WDL-v81B (for demineralizer WDL-K-1A and WDL-K-1B, respectively).
The outlet of the decineralizers is a 3" pipe, reduced to 2-1/2" and having WDL-ll8A and WDL-Vll8B (for demin-eralizer WDL-K-1A and WDL-K-1B, respectivel y).
The effluent is returned to the Reactor Coolant Make-Up and Purification System upstream of the Make-Up Filters.
The outlet line i
also branches out to a 1/2" line with valve WDL-V77 and j
leads to the nuclear sampling station.
3.2.2 Reactor Coolant Bleed Hold-Up Tanks The Reactor Coolant Bleed Hold-Up Tanks receive liquid from the feed and bleed operations, volume changes in the Reactor Coolant System or drainage, etc.
The Reactor Coolant Bleed Hold-Up Tanks receive liquids as indicated in Section 1.2.
Normally, one tank is valves to receive the liquid.
A summary of the operations, after the liquid is collected, is listed
- below, a.
A 2 psi nitrogen blanket is maintained on the tank.
The nitrogen flow into the tanks through a 1" line (reduced to 1/2") with a 1" globe valve WDL-V158A, B,
C and check valve WDL-vl92A, B,
c.
The tank is vented to the Waste Gas Header through a 1" diaphragm valve WDL-V26A, (B,C).
One Waste Transfer Pump is used to recirculate the liquid to obtain a representative sample.
The outlet line from each tank, is a 3" pipe with connections to two 3" suction headirs which connects to either of the two Waste Transfer Pumps.
The suction line (s) from the tank (s) to Waste Transfer Pump WDL-P-5A has 3" gate valv e (s)
WDL-V166A (B,C), (locked opent..
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The tank outlet lines connect to one suction header through a 3" diaphragm valves (WDL-V29A, (B,C), and to the other suction header through 3" diaphragm valves WDL-V28A (B,C).
Waste Transfer Pumps WDL-P-5A & SB each draw suction from their suction header through WDL-V31A and 31B respectively.
Each waste Transfer Pump can discharge to the Reactor Coolant Evaporator,WDL-Z-1,
to the Make-Up and Purification System (upstream of the Make-Up Filters), to the Unit 1 Miscellaneous Waste Evaporator, to the Clean-Up Filters,*or recirculate back to any of the Reactor Coolant Bleed Hold-Up Tanks.
A 1/2" branch is provided off the recirculation pipe, through a 1/2" valve WDL-V37 to the Nuclear Sampling System.
The disposition.of the tank contents is determined by applying the following criteria to the sample:
1.
If the boron concentration, activity and tritium levels permit, the liquid can be returned to the Makeup System without further processing.
2.
If the activity level and the boron concentration is high, the liquid is pumped through the Clean-Up Demineralizers to the Reactor Coolant Evaporator.
3.
If the activity level is low and the boron concentration
,is high, the liquid may be directed to the Reactor Coolant Evaporator and may bypass the Cleanup Dcmineralizers.
4.
If the Reactor Coolant Evaporator is not operational, a stool piece connection can by added so that the liquid is direcied to the Unit #1 Miscellaneous Waste Evaporator.
l _
5.
If the sample of the liquid in the Reactor Coolant Bleed Hold-Up Tank (s) indicates that the liquid can be released to the environment, a spool piece can be added so that the liquid can be pumped to the plant discharge line upstream of the radiation monitors.
One Waste Transfer pump is valves to transfer liquid from the Reactor Coolant Bleed Hold-Up Tanks.
As the liquid is removed from the tank, nitrogen or waste gas is automatically added to maintain a positive tank pressure of about 2 psig.
3.2.3 Refctor Coolant Evaporator 7
Prior to the Evaporator operation, Reactor Coolant is pumped from the Reactor Coolant Bleed Hold-Up Tanks into the 1,000 gallon. Evaporator Feed Tank.
The operation is moni-tored and automatically controlled by a liquid level con-troller which regulates a waste inlet flow control valve, while a backup float control valve in the feed tank mechani-cally prevents the tank from over filling.
The feed pumps continually circulate the process fluid between the feed tank and the concentrator.
A concentrator level control downcomer pipe constantly drains off a given amount of concentrator bottom. for mixing with the faed solution in the feed tank and recirculation to the con-centrator.
A built-in weir around the tube bundle in the concentrator automatically maintains correct liquid level in the concentrator.
An integral low temperature, low pressure steam tube bundle is the heating media for evaporation in the con-l centrator.
The system operates at a low temperature of l
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o 160 F or less at a vacuum of approximately 20" Hg.
The i
concentrator shell is protected from over-pressure by a 13 psig -
15 psig rupture disc.
Steam pressure and temper-ature are controlled from the Auxiliary Steam System at approximately 10 psig saturated steam, 9766#/Hr. at 193 F.
Nuclear Service Closed Cooling Water is used to condense the steam vapors in the integral concentrator condenser.
A conductivity cell continuously monitors the distillates after it leaves the concentrator in the distillate reservoir.
If the distillate does not meet the desired quality,,
a signal is sent to the parallel discharge and reject valves to divert the impure distillate back into the feed tank.
Demisters and sieve trays are located above the boiling section of the concentrator for removing entrained impuri-ties and moisture from the steam vapor.
Ten percent of the pure distillate is refluxed back into the sieve trays to further purify these vapors.
The non-condensable gases in the concentrator are removed via a vacuum connection in the condensing section of the evaporator for discharge to the Waste Gas Header.
A distillate cooler is provided to reduce the temperature of the pure distillate to less than 120 F.
The distillate normally flows from the Reactor Coolant Evaporator through one of the Evaporator Condensate Demin-eralizer~s to one of the Evaporator Condensate Test Tanks.
The liquid may be sampled as it flows into the Evaporator Condensate Test Tanks.
The Evaporator may be adjusted to process continously or in batches.
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, Evaporator Condensate Test Tank when one of the Evaporator Condensate Test Tanks is full, the other tank is put in service.
The filled evaporator Condensate Test Tanks' contents are recirculated using one of the Evaporator Condensate Puraps, to obtain a repre-sentative sample.
s Depending on the results of the sample, the liquid is recirculated through one of the Evaporator Condensate Demineralizers or is directed to the plant discharge line.
3.2.5 Evaporator Condensate Demineralizer
~
The Evaporator Condensate Demineralizer receive distillate from the Reactor Coolant Evaporator and processes this liquid to produce reactor grade water at the demineralizer effluent.
The demineralizers contain a mixed bed, H-OH type resin and have a normal flow of 15 gpm.
A resin trap is.provided at each demineralizer effluent to trap any resin Which may escape from the demineralizer
{
resin bed.
l 3.2.6 Clean-Uo Demineralizers l
The Clean-Up Demineralizers receive coolant from the' l
l Reactor Coolant Bleed Hold-Up Tanks and are used to re-duce the radioactive level of this fluid.
The deminerali-zer effluent can be directed to the Reactor Coolant Evapora-tor, directly to the plant discharge line (via a spool piece),._a recirculated back to the Reactor Coolant Bleed
H'old-Up Tanks.
Clean-Up Filters and Clean-Up After Filters are provided on the influent and effluent lines respectively.
The demineralizers have a mixed bed nuclear resin with a cation to anion ration of 3 to 1 and have a normal flow of 20 gpm.
'3. 3 Shutdown The system has no special method of shutdown.
The liquid flow through a particular pipe line or component can be discontinued by stopping the associated pump (s) and shutting the appropriate valves.
3.4 Special or Infrequent Operation If the Reactor Coolant must be processed but the Evaporator is in operative, flow is then directed to the Unit 1 Miscellaneous Evaporator through a spool piece.
3.5 Emergency The WDL System operation is not required in a Loss of Coolant Accident.
The Reactor Coolant Bleed Holdup Tanks are isolated from the Reactor Building with either an ES signal or Pressurizer Relief Valve lifting (see System Description Index No. 64).
Nuclear Closed Cooling Water to the Evaporator Cooler is secured by an ES signal.
4.0 HAZARDS AND PRECAUTIONS Since the system operates as moderate temperaturs and pre-sures, the greatest hazard would an inadvertent release of radidactivity.
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The release could have resulted from an inadvertent discharge of,high level waste or a system rupture.
To preclude releasing radioactive liquids to the environment, the following precautions are observed:
a.
All batches are manually released.
b.
All batches are sampled before released.
Redundant monitors located in the discharge line auto-c.
matically close two valves (in series) and shut down the Evaporator Condensate Pump (s) if they detect a preset radiation level.
To minimize the danger, should a system leak or break occur, the following precautions are taken:
a.
Components are located in separate, shielded cubicles.
b.
Local floor drains direct all liquids to one of the sumps for recovery and processing.
Radiation alarms warn of high radioactivity.
c.
Normal radiological precautions must be observed while in the vicinity of or while operating any portion of the system.
Nitrogen used for blanketing can displace oxygen.
Sample air,and/or ventilate if a leak is suspected, or someone enters a nitrogen blanketed tank.
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TABLE 1 REACTOR COOLANT BLEED HOLD-UP TANKS Identification WDL-T-lA, WDL-T-1B, WDL-T-lC Manufacturer Nooter Corporation capacity - gallons / tank 82,286 Installation Horizontal Outside diameter & Length 15'-6", 60'-8-1/4" I
Shell Material SS Type 304 Shell thickness, in.
5/16 Desigt. tempera ture, F
150 Design pressure, psig 20 Corrosion allowance, in.
O Design Code ASME 1968 Sect. III, Class C Code stanp required Yes i
Classification Level Code N-3 Quality Control 3
Seismic I
cleanliness B
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TABLE 2 EVAPORATOR CONDENSATE TEST TANKS I
Identification WDL-T-9A, WDL-T-9B Manufacturer Richmond Engineering Co.,
Inc.
Capacity - gallons / tank 11,860 Installation Vertical Outside diameter & Length 11'-6"; 16'-11-1/8" Shell material SA-240, 304 S S Shell thickness, in.
3/8 Design temperature, F
150 Design pressure, psig Static head Corrosion allowance, in.
O Design code ASME Code stamp required No Classification Level Code C
Quality Control 4
Seismic II Cleanliness D
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TABLE 3 REACTOR COOLANT DRAIN PUMP l
PUMP DETAILS Identification WDL-P-7 Number installed 1
Manufacturer Crane-Deming Model No.
A-50 Type Single Stage Horizontal Centrifuga Rated speed, rpm 1750 Rated capacity, gpm 100 Rated total Dynamic Head, ft.
50 NPSH, ft.
3 Design pressure, casing, psig 150 Design temperature, F
200 Lubricant / Coolant oil /N/A Min. flow requirements, gpm 3
MOTOR DETAILS Manufacturer Westinghouse Type Squirrel Cage Induction Enclosure Drip proof Rated Horsepower 5
Speed, rpm 1750 Lubricant / Coolant oil / air Power requirements 460V, 35, 60 Hz, 6.8 amps full load Power Source 480V MCC 2-42A
_Classifica tiEn Level Code N-2 Quality Control Q-1 Seismic I
Cleanliness B
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TABLE 4 WASTE TRANSFER PUMPS PUMP DETAILS Identification WDL-P-5A, WDL-P-5B Number installed 2
Manufacturer Crane-Deming Model No.
A-10 Single stage horizontal centrifugal Type Rated speed, rpm 3500 Rated capacity, gpm 100 Rated total Dynamic Head, ft.
153 NPSH, ft.
8 Design pressure, casing, psig 100 Design temperature, F
150 Lubricant / Coolant oil /N/A.
Min. Flow requirements gpm 4
Seal water yes MOTOR DETAILS Manufacturer Westinghouse Type Squirrel Cage Induction Enclosure Drip proof Rated horsepower, hp 15 Speed, rpm 3500 Lubricant / Coolant oil / air Power requirements 460V, 35, 60 Hz, 18.3 amps full Ic.)
Power Source 480V MCC 2-32A for Pump WDL-P-5A 480V MCC 2-42A for Pump WDL-P-5B Classificati n Level N-3 Code Quality Control Q-3 Seismic I"
Cleanliness B _ _ _ _
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TABLE 5 EVAPORATOR CONDENSATE PUMPS PUMP DETAILS Identification WDL-P-llA; WDL-P-llB Number installed 2
Manufacturer Crane-Deming Model No AA Type Single stage horizontal centrifugal Rated speed, rpm 3500 Rated capacity, gpm 50 Rated total dynamic head, ft.
75 NPSH, ft.
6 Design pressure, casing, psig 50 Design temperature, F
150 Lubricant / Coolant oil /N/A Min. flow requirements, gpm 3
Seal water yes i
MOTOR DETAILS Manufacturer Westinghouse Type Squirrel cage Lifeline "T"
Enclosure Drip proof Rated horsepower, hp 3
Speed, rpm 3500 Lubricant / Coolant oil / air Power requirements 460V, 3W, 60 Hr, 1.3 amp full load Power Source 480V MCC 2-32A for Pump WDL-P-llA 480V MCC 2-42A for Pump WDL-P-llB Classification Level Code N-3 Quality control Q-3.
Seismic I
Cleanliness B
~34-
TABLE 6 REACTOR COOLANT EVAPORATOR Identification WDL-Z-1 Manufacturer AMF-Beaird Capacity, gpm (distillate) 15 Operating temperature, F 160 Operating pressure, in (Hg) 20 overpressure protection, psig 13-15 (rupture disk)
Steam inlet pressure, psia 30 Steam inlet flow, lb/hr 7500 Steam inlet temperature, F 193 Cooling water flow, gpm 680 l
Cooling water A T, F pts 20 Reflux flow, gpm 1.5 (10% of capacity)
Distillate outlet temp. F 120 i
Feed Tank capacity, gal 1000 Feed Pump flow, max., gpm 100 t
Design Code ASME Section III Subsection C i
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