ML19221A426
| ML19221A426 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/24/1979 |
| From: | GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| Shared Package | |
| ML19221A425 | List: |
| References | |
| NUDOCS 7905230007 | |
| Download: ML19221A426 (11) | |
Text
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THREE MILE ISLAND UNIT SYSTEM CRITERIA FOR USE OI' STEAM CENERATCR "A" FOR SHORT AND LONG TERh COOLDOWN (REV. 3) e'e' B & R Task #TS 3
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Tech. Mod. #16 a
- 17 a Approved
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. 1.0 SYSTEMS CRITERIA 2.0 (DELETED)
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3.0 LONG TERM DESIGN BASIS 3.1 Functional Performance Requirements
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3.2 Applicable' codes and Standards 3.3 Des ign Eas.is 3.4 Sizing Requirements 3.5 Layout Requirements 3.6 Environmental Requirements 3.7 Sampling Req airements 3.8 Material Requirements 9
3.9 Electrical Requirements 3.10 Testing Requirements 3.11 Instru=entation and Control 3.12 k'a t er Chemistry Requirements 162 187 O
THREE MILE ISIJJ'D UNIT 2 System Criteria for Use of Steam Generator "A" for Short and Long Term Cooldown 1.0 SYSTEMS CRITERIA This document defines the design for providing for water to water cooling in steam generator "A" to remove decay heat.
2.0 (DELuTED)
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3.0 LONG TERM BASIS 3.1 Functional Performance Requirements Recirculation of high pressure closed cycle cooling water thru the secondary side of the "A" steam generator for re= oval of decay heat from the primary coolant.
'Ihe ultimate heat sink shall be river water.
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Yage a or o 3.2 Applicable Codes and Standards Piping
- ANSI B31.1 Eeat Exch nger
- ASME Section VIII Tanks
- ASME Section VIII Punps
- Hydraulic Institute Standards Valves
- ANSI B16.5, B16.34 Note:
ASlit' Ss etion III components will be utili, zed when availabic.
3.3 Design Basis 3.3.1 The system may be designed as non-seismic category I.
3.3.2 The system shall be designed to operate with a loss of off-site power.
3.3.4 The system shall include a surge tank to accomodate changes in fluid volume and temperature in the closed loop.
Surge voloces shall be adequate to prevent liquid or gaseous releases during system transients and startup.
3.3.5 The system shall have the capability to regulate the temperature and flow rate o f cooling water entering the st eam generator.
3.3.6 Provis ions shall be available for preheating the feedwater when filling the steam generator (160 -180 F at 50 gpm).
3.3.7 The system shall be designed to be independent of the cooling system for "B" steam generator to the extent that a single active failure will not cause a loss of cooling of the reactor coolant system.
3.3.8 The system shall be equipped with sufficient test and instrumentation connections for sys em preoperational testing and normal operation.
3.3.9 The system shall be desigr.ed to supply cooled water to the steam generator through the main feedwater nozzle and receive heated water through the main steam nozzle.
3.3.10 The system design shall employ all welded connections to the greatest extent possible to minimize system leakage.
3.3.11 The system design shall include ptoviciens for future addition of automatic controls.and alar =s.
3.3.12 The system design shall maintain containment integrity.
3.3.13 The system design shall provide means for monitoring and controlling cooling water chemistry requirements as specified by Section 3.12.
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3.3.14 The system design shall cinimize the use of auxiliary support syste=s (bearing cooling water, lubrication oil, instru=ent air).
Loss of instrument air shall not change the operating parameters (flow and temperature) of the system.
3.3.15 The system pressure shall always be =aintained at a pressure higher than the primary coolant pressure so there will be no leakage of primary water into the closed cooling system.
3.3.16 The system shall be designed to remove the required heat load with variations in the temperature of the ultimate heat sink shown in Section 3.4.
3.3.17 The system shall have provisions for installation of future water purification systen with capability (resin disposal and shielding) to handle radioactive water.
Installation and startup of this equipment shall not interrupt s3 stem function.
3.3.18 The system shall be provided with proper overpressure relief devices.
The discharge of the overpressure relief devices shall be piped such that they ndnimize the spread of -contaminated fluids.
Surge tank relief valve (s) shall be sized to protect against f ailures of the makeup or blanketing gas valves as appropriate.
Relief valves shall be capable of relieving the water expansion in the secondary side of the steam generator should the cooling water flow be lost.
The maximum heatup rate is 500F/hr.
3.3.19 The uhstem shall have proper connections, pump suction straince and odher provisions for flushing of new piping and ccoponents prior to startup.
New piping and components shall be in a cleaa and neutralized state when installed.
Chemical cleaning shall not be used after installation.
3.3.20 The system shall be checked for correct valve alighnent.
Those items which could interfere with the proper f unction of the system shall be locked out.
Vents and drains shall be provided.
3.3.21 Provisions shall be made to hold up any system leakage for sa=pling prior to release to uncontrolled drainage syste=s.
3.3.22 Provisions shall be made te =ake small incremental changes in feed-water flow Cl25 GPM) to the steam generator and to reduce total flov to a maximum of 10-50 GPM, during steam generator filling.
3.3.23 The system shall have provisions for nitrogen addition during the filling of the scea= generator if required.
3.3.24 Provisions shall be made to canually supply makeup at system pressuts without interruption of system operation.
Demand shall be indicated by a low level alarm on the surge tank.
3.3.25 A' recirculation line to meet the minimum flow requirements of the pump shall b,e provided.
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Page 5 of 7 3.4 Sizing Requirements 3.4.1 Th e system shall be designed to meet the following requirements:
(a) flow through steam generator 3,000 to 5,000 gpm (b) steam generator inlet temperature 800F (c) steam generator outlet temperature 80 to 250 F (d) design pressure at S/G inlet 650 psi (e) river water temperature' 34 to 85 F (f) river water flow rate as required to remove heat logd (g) heat exchanger duty 30 x 10 ETU/ Er. (in c] udes heat f rom 1 RC Pum(j 3.5 Layout Requirements 3.5.1 The system equipment shall be located to facilitate construction and future modifications, and ease of access during operation.
3.5.2 Th e sys t em flow path shall consist of cooled water entering the st am generator through the main feedwater nozzle, exiting the steam generator through a main steam line, entering the heat exchanger and returning back' to the steam generator using the sy s t em p ump.
The ulticate heat sink shall be provided by the nuclear -
servi,ces river water systems.
On the river water side, the necicar services river varer system shall,'be cross-connected to the secondary services river water system to provi'e cooling.
Refer to figures.1 + 2 attached (OTSC) cooldown - steam generator A -
high pressure.
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3.6 Environment Requrirements All equipment shall be located indoors excep; the alternate diesel generators 3.7 Sampling Requirements Ad equa te (size and quantity) sampling connections shall be provided for water chemistry and radiation monitoring.
3.8 Materials Requirements All vetted materials shall be compatible with fluids having water chemistry specified in section 3.12.
3.9 Electrical Requirements f/
ms 162 192 4
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of 7 Pa;t o 3.9.1 Electrical equipment shall be capable of being started and powered from an on-site diesel generator set in the event of a loss of off-site power.
Loads shall be sequenced on to the diesel generator set l
manually.
Jriteria shall be established for the taximum allowable i
time to restore voltage after a loss of off-site power.
3.9.2 Electrical classification of the system is non-class IE 3.9.3 Components should have maximum practical physical separation from the
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opposite steam generator cooldown system components to provide protection against events such as fire and missiles from sources l
internal to the plant.
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' 3.9.4 The system shall be electrically independent of the system for steam generator "B".
3.9.5 Vital Icads in the system shall be suppled through bus 2-3 and the " gray" diesel generator.
3.9.6 Motor rated starting voltage shall be verified consistent with the voltage regulation capability for " gray" diesel generator.
Motor feeders shall be protected consistent with original plant design and normal trips for overload, etc. shall be used.
3.9.7 Electrical load list (to be confirmed):
f HP, Vol tage Source Load PGE Decay Heat Pump /WPPS 700 4000 Eus 2-3 Nuclear Services River Water Pump 400 4000 Bus 2-3E i
NR-P-1A or 13 3.9.8
" Criteria for General Mod'.fication to the BOP Electrical System" are applicable.
Also, refer to " Criteria for Loss of Offsite BOP Electrical Power."
l 3.10 Testine Requirements provisions shall be made for pre-operational testing of the system, including hydrostatic tests and flushing of new piping.
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Flanges shall be >rovided at the new pump suction and discharge to isolate the pu=;
during system hydrostatic testing if reqired to protect the pu=p seals.
3.11 Instrumentation and Control Requirements
'o 3.11.1 The system shall be designed to provide instrumentation suf ficient t
monitor f.unctional perforcance requirements including:
(a) pump discharge pressure, 0 - 800 psig (b) stea= generator inlet and outlet temperatures 50 - 250*F
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(c) fluw rate, nominally 3,000 gpm, maxi =um 5,000 gpm (d) river water inlet and outlet t e=peratures 0 - 100*F (e) surge tank high and low Icvel indication and alarms.
3.11.2 Critical instrumentation shall be duplicated (specifically, st a I
generator inlet acd outlet te=perature and sys tem flow rate).
3.11.3 Area radiation =onitoring shall be provided" where the equipment and ce=ponents are, installed.
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3.11.4 The attached list of instrumentation shall be operabic when the
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system is placed in service.
3.11.5 Instruments, including power supply, shall be independent from instrumentation for steam generator B.
Instruments shall be supplied from an odd-numbered plant instrument bus.
If available, uninterrup-table power shall be used.
3.11.6 Control circuits fer existing equipment shall be reviewed to ensure that no spurious automatic, canual or interloc;. signals will cause incorrect operation of the system.
S; ecifically, all automatic emergency feedwater actuation sigr.als chall be defeated and all auto-matic control signalt to the feedwater concrol valves shall be disabled.
3.11.7 Provisions shall be made for future installation of controls and remote indicators in the Unit 2 control room.
(It is assumed a new panel vill be used.)
3.11.8 Controls and indicators are to be segregated from those for steam Zenerator B, ur ing a separate panel or a separate section of a common panel.
3.11.9 Control shall be manual.
Ruu/off/ trip indicator lights shall be pro-vided for motors and open/close/ trip lights shall be provided for valves.
3.11.10 Control calles should have approximately 100% spare conductors to allow f or future modifications.
3.11.13
" Loss of System Function" shall be,larmed locally and in the main contrbl room. __ __
e 3.11.12 nociation monitoring and alarus shall be provided at the outlet of the steam generator and at the secondary services closed cooling water outlet of the new heat exchanger.
The monitors shall be capable of detecting leakage from the reactor coolant system into the steam generator or the secondary services closed cooling water system.
3.11.13 Thermove11s capable of using mercury glass thermometers shall be provided as close as practical to the steam generator inlet and outlet.
3.12 Water Chemistry 3.12.1 The system water chemistry for the steam generator shall be ma'_ntained in accordance with the following:
(a) pH @ 77'F 9.3 - 10.5 (controlled by NH 0H) 4 (b) 0 dissolved 100 ppb =ax.2 (OTSG <300*F) 2 (c) Cation conductivity 10 umho/ cm, max (d) Hydrazine at least 300% of stoichiometric 02 e ncentration (e) Surge tank level 3.]2.2 The cakeup and fill water chemistry for the steam generator shall be in accordance with the E ' lowing:
02 @issolved),
100 ppb max 2, (OTSG (300*F)} b 2
) h k Cation conductivity 1 umhc/ cm2, max.
3.12.3 Means shall be provided to add a=monia hydroxide and hydrazine to the system.,.
The chemical addition point shall be downstream of the fu ture wa ter our* fication system.
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