ML19221A489
| ML19221A489 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/10/1979 |
| From: | Capodanno G GENERAL PUBLIC UTILITIES CORP. |
| To: | Mattson R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7905230080 | |
| Download: ML19221A489 (16) | |
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Inter-Office Memorandum Date April 10, 1979 IsAd Service
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Suhect TMI-2 Modification Criteria for use of Steam Generators for Short.
& Long Term Cooldown Three Mile Tsland To.
W.
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Cobean m on The attached criteria is forwarded for use in designing plant modifications to use the "A" and "B" steam generators as water to water heat exchangers for decay heat removal._
The attached implementation plan has been developed in conjunction with on site design personnel and identifies the schedule for this work, priorities, justifications, and responsible organizations.
In developing procedures for operation and start up of the a systems, the following items must be considered:
- 1. The means to be used during start up of the "B" generator schemes to minimize any possible carry over of radioactive contaminants throughout the closed cooling loop and hence additional portions of the plant.
2.
The threshold level of activity at which the closed loop should be shut down.
This should be predicated on expected leakage rates and consequent rate of contamination.
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9 Tl!REE MILE ISLAND UNIT 2 SYSTEM CRITERIA FOR USE OF STEAM GENERATORS FOR SHORT AND LONG TERM COOLDOWN (REV. 1) 7 8
4/10/79
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ask fTS 3 APP $00E0 163 165 4
INDEX 1.0 SYSTEMS CRITERIA 2.0 SHORT TERf1 BASIS 2.1 Functional Performance 2.2 Applicable Code And Standards 2.3 Design Basis
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2.
.4 Sizing Requirements 2.
.5 Layout Requirements 2.
.5.1 Steam Generator "A" 2.
.5.2 Steam Generator "B" 2.
.6 Environmental Rgquirements 2.
.7 Samplinn Requirements 2.
.8 Material Requirement 2.
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Electrical Requirements 2.
.10 Testing Requirements 2.
.11 Instrumentation And Control 2.
.12 Water Chemistry Requirements
.p 3.0.
LONG TERM BASIS 3.1 Functional Performance Requirements 3.2 Applicable Codes and Standards 3.3 Design Basis
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l 3.4 Sizing Requirements 3.5 Layout Requirements 3.6 Environaental Requirements (Continued)
3.7 Sampling Requirements 3.8 Material Requirements 3.9 Electrical Requirements 3.10 Testing Requirements 3.11 Instrumentation And Control Requirements 3.12 Water Chemistry e
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Page 1 of 11 THREE MILE ISLAND UNIT 2 System Criteria For Use Of Steam Generators For Short And Long Term Cooldown 1.0 SYSTEMS CRITERIA This document defines the design criteria for providing for water to water cooling in the steam generators to remove decay heat on a short term and long term basis.
2.0 SHORT TERM 1 ASIS 2.1 Functional Performa1ce Requirements Recirculation of low pressure clo ed cycle water thru the secondary side 01 the steamy generators for removal of decay heat from the primary coolant.
Th,e ultimate sink shall be river water.
2.2 Appliccble Code And Standards,
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Piping
- ANSI B31.1 Heat Exchanges
- ASME section VIII Tanks
- ASME Section VIII Pumps
- ASME Section VIII or APl Valves
- ANSI B16.5, B15.34 163 168 e
Page 2 of 11
.3
.Desian Basis
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.3.1 Steam, Generator A Use the existing condensate - fecdwater system.
Operate one condensate pump with the o r.h e r s standby..
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The condensate booster pump and feedwater pump are not running and the cooling water-is pumped thru (impellers removed and aux. cooling water not required).
The feedwater heaters are bypassed and the water enters the steam generator thru normal main feedwater connection and out the main steam connection to the main condenser via the condenser makeup line.
A manual means of locking the makeup control valve in position shall be provided.
Alternate diesel generator power must be supplied to electrical components wherc
_ necessary.in case of loss of off-site power to provide proper system operction.
Circulating water system ir, rormal operation will be used.
In case of loss of off-site power, diesel powered alternate cooling water source (river water) will be employed.
Diesel power to circulating water pump discrarge valve will be used.
Makeup shall be taken from th condensate storage tanks by gravity to the condenser.
Loss of condenser vacuum requires opening of the vacuum breaker (to be diesel powered), and recirculation of the condensate pump discharge to cool condensate in hotwell.
System shall be checked for correct valve alignment.
Those.
items which could interfere with the proper function of the system shall be locked out.
Connections shall be provided for tie in of the long term cooling system.
These connections and any non-isolatable portions of the short term cooling scheme shall be of
,7 adequate pressure class to be compatible with the design pressure of the long term system.
3 S;esmic classification shall be non-siessic Category I.
Provisions shall be made for slow,' controlled filling of the steam generator to avoid water hammer (steam bubble collapse) and too rapid cooling of the steam generstac.
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Page 3 of 11 2.3.7 Steam Generator "B" System to be closed cycir,to contain contamination, utilizing an existing heat exchanger - pump system.
This system to be cross connected to existing feedwater system downstream of feedpumps and to main steam system.
Flow direction in the steam generator is in through the main feedwater connection and cut through the main steam nozzle.
Flow control shall be manual via a valve (either existing or new) in the pump discharge line.
Alternate diesel power shall be supplied to electrical components where necessary in the closed loop to provide proper system operation in the event of loss of offsite power.
Closed cycle system to use demineralized water with makeup taken f-om the demineralized water. system.
L Provide new surge tank if~necessary.
Provide connections for tie in of long tern cooling system.
Connections provided for the future addition of the long term cooling scheme and non-isolatable. portions of the short term scheme shall be of adequate pressure class to be compatible with the design pressure of the long term system.
For temperature control, provisions shall be made to bypass the heat exchanges on the closed cycle side.
_3 Siesmic classification shall be non-siesmic Category I.
Provisions shall be made for slow, controlled filling of the steam generator to avoid water hamner (steam bubble collapse) and too rapid cooling of the steam generator.
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System shall be checked for correct valva alignment.
Those items which could interfere with the proper
, function of the system shall be locked out.
Vents and drains shall be provided.
2.4 Sizino Requirements Flow to Steam Generator 3000 gpm Heat Exchanger Outlet Temp /S.G. Jnlet 1000 F Heat Exchanger Inlet /S.F. Ou tl e,t 120 F
.200 F
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System Pressure Capability of existing componepts Heat Exchanger Duty 30 x 10 Btu /hr River Water Flow 32 to 850 F River Water Inlet Temperature Steam Gen.
"A" 17,100 gpm River Water Flow Steam Gen.
"B" Approx. 4,000 gpm 163 170
Page 4 of 11 2.5 Layout Requirements 2.5.1 Steam Generator "A"
' Reference Figure 1 attached.
Secondary side shall utilize existing condensate, feedwater, and main steam systems.
On the river water side, the nuclear services cooling water system shall be cross connected to the circulating water system to provide cooling on loss of offsite power.
Cross connections shall be made in the pumphouse from the huelear services river water to the secondary services river water system, and in the turbine building from the secondary services river water system to the circulating water sys,, tem.
u, The cooling water system to steam generator " A" must be isolated from steam generator SB" cooling system.
2.5.2 Steam Generator "B" Reference Figure 2 attached.
Secon'dary side shall utilize portions of the existing feedwater and main steam system cross connected with new piping to the existino secondary services' closed cooling water system.
These cross connections shall be made in the turbine building.
On the river water side,the nuclear services cooling water system shall be cross connected to the secondary services river water system in the river water pump house.
Provision shall be made to bypass the heat exchanges on the closed loop for temperature control.
2.6 Environmental Requirement All equipment is or shall be located indoors in the river water pump house or turbine building except the altern~ ate diesel generators which shall be suitable for outdoor installation.'
f 2.7 Samplino Requirements Sarapling provisions on the steam generators inlet and outlet for water chemistry and radiation monitoring.
2.8 Material Recuirement 163 171 All materials shall be compatible with the fluids I
being pumped.
Page 5 of 11-
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2.9 Electrical Requirements (Later) 2.10 Testino Requirements Provision shall be made for preoperational testing of,the system, including hydrostatic testing and flushing of new piping.
2.11 Instrumentation And Control Revi.ev existing instrumentation and controls to assure proper function of system under new conditions.
Specific consideration shall be given to the affects on system operation of spurious automatic control signals to existing giant components that are part of this system.
Instrumentation to be provided for the following:
Flow 0- 6000 GPM range Temperature 0 - 5000F Pressure Pump shut of f head Radiation Monitoring Area =onitoring where equipment and components are installed Instrumentation and controls shall be local.
Flow and temperature control shall be manual.
Critical instrunentation shall be redundant.
2.12 Water Chemistry Requirements Water chemistry shall be maintained in accordance with the following:
PH @ 77 F 9.3 - 10.5 0
(dissolved) 100 PP B max 2
(OTSG < 300 F) 2 Cation Conductivity 1.0 y mho / cm Hydra:1ne At least 300% of stoichimetric 0
concentration 2
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LONG TERM BASIS Functional Performance Requirements Recirculation of high pressure closed cycle cooling water thrt' the secondary side of the steam generators for removal of decay heat from the primary coolant.
The ultimate heat sink shall be river water.
Applicable Codes and Standards Piping
- ANSI B31.1 Heat' Exchanges - ASME Section VIII Tanks
- ASME Section VIII Pumps
- ASME Section VIII or APl Valves
- ANSI B16.5, B16.34
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Electrical (later)
Note:
ASME Section III components will be utilized when available Design Bases
.1 The system shall be designed as non-seismic category I.
.2 The system shall be designed for long term continuous cooling for a minimum of two years.
.'3 The system shall be designed to operate with a loss of off-site power.
.4 The system shall have the ability to accommodate changes in fluid volume and temperature in the closed loop.
.5 The system shall have the capability to regulate the temperature of cooling water entering the steam generator.
.6 The system shall be designed to operate at 100% capacity with a loss of a single active component.
.7 The system shall be equipped with sufficient test and instrumentation connections for system preoperational testing and-normal operation.
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.8 The system shall be designe,d to supply cooled water to the steam generator through the main feedwater nozzle and receive heated water through the main steam nozzle.
.9 The system design shall employ all welded connections to the greatest extent possible to minimize system leakage.'
.10 The cooling system loop for the "A" steam generator shall be designed-to minimize the unavailability of the "A" steam generator when bringing the cooling system on line.
163 173 1
Page 7 of 11
.3 11 The system shall include provisions for future addition of automatic controls and alarms.
.3.12 The system design shall maintain containment integrity.
.3.13 The system design shall provide means for controlling cooling water chemistry requirements as specified by B & W.
.3.14 The system design shall minimize the use of auxiliary support systems (bearing cooling water, lubrication oil, instrument air).
.3.15 The system shall be designed to operate at a pressure higher than the primary coolant pressure so there will be no leakage of primary water into the closed cooling system.
.3.16 The system shall be designed to remove the required heat load with variations in the temperature of the ultimate heat sink.
.3.17 The system design must include the capabi.ity to degas the cooling water.
.3.18 The system shall have provisions for a future clean-up system should the cooling water become contaminated.
.3.19 The system shall be provided with proper ' overpressure relief devices.
.3.20 The system shall have provisions for proper system flushing prior to startup.
.4 Sizing Require-ants
.4.1 The system shall be des,igned to meet the following requirements:
(a) flow through steam generator 3000 gpm (b) steam generator inlet temperature 100 F 0
0 (c) steam generator outlet temperature 120 to 200 F (d) design pressure at S/G inlet 800 psi 0
(e) river water temperatures 34 to 85 F (f) river water flow rate as required to remove heat load with a 10 F or less increase in river water temperature
.5 Layout Requirements
.5.1 The system equipment shall be loc'ated to facilitate constr,uction and ease of access during operation.
.5.2 The system flow path shall consist of cooled water entering the steam generator through the main feedwater nozzle, exiting the steam generator through the main steam line, entering the heat exchanges (coolers) and returned back to the steam generator using the system pumps.
(Refer to figure 3).
The ultimate heat sink shall be provided by the nuclear services river water system.
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Page 8 of 11
- l. 6 Environmental Requirements l.6.1 All equipment shall be located indoors except the alternate diesel generators which shall be suitable for outdoor installation.
I. '7 Sampling Requirements
!.7.1 Adequate sampling connections shall be providea. for, water chemistry and radiation monitoring.
i.8 Material Requirements
. 8.1 All wetted materials shall be compatible with the water being handled.
.9 Elec'trical Requirements
.9.1 (later)
.10 Testing feguirements
.10.1 Provisions shall be made for preoperational testing of the system, ~
-including hydrostatic tests.
.11 Instrumentation and Control Requirements
.11.1 The system shall be designed to provide instrumentation sufficient to monitor fun.ional performance requirements includiag:
(a) pump discharge pressure, 0 - 800 psigv (b) steam generator inlet and outlet temperatures 50 - 250 F (c) flow rate, nominally 3000 gpm (d) river water inlet and outlet temperatures 0 - 100 F
.12 Water Chemistry
.12.1 Water chemistry shall be maintained in accordance with the following:
(a) ph @ 77 F
9.3 - 10.5
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(b) 02 dissolved 100 ppb max.'
(otsg<300 F) 2 (c)
Cation conductivity
- 1. 0 pmhs / cm (d)
Hydrazine at least 300% of stoichio-metric 0 concentration 2
Critical instrumentation,shall be, redundant.
Area radiation monitoring shall be provided where the equipment and components are installed.
Specific consideration shall be given to the affects on i
system operation of spurious automatic control signals to existing plant components that are part of this system.
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