ML20205S890
| ML20205S890 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 02/12/1987 |
| From: | BECHTEL GROUP, INC. |
| To: | |
| Shared Package | |
| ML20205Q691 | List:
|
| References | |
| 18691-E-001(Q), 18691-E-1(Q), NUDOCS 8704070151 | |
| Download: ML20205S890 (23) | |
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18691-E-001(Q) l
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DESIGN CRITERIA DOCUMENTS COVER SHEET FOR NORTHEAST UTILITIES SERVICE COMPANY CONNECTICUT YANKEE POWER STATION NEW SWTICHGEAR BUILDING PROJECT JOB NO: 18691-001 DISCIPLINE: _ Electrical / Control Systems i
8704070151 870401 PDR ADOCK 05000213 R PDR H
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18691-E-001(Q)
TABLE OF CONTENTS
_P,a21
- 1. 0 GENERdLINTRODUCTIONANDSCOPE 1 I
2.0 CODES AND STANDARDS 1 j 3.0 AC POWER SYSTEM DESIGN 7 4.0 DC POWER SYSTEM DESIGN 10 .
- 5.0 VITAL AC SYSTEM 11 t
j 6.0 CABLES 12 7.0 SEPARATION CRITERIA 13
{ 8.0 RACEWAY SYSTEMS 14
! 9. 0 ENVIRONMENTAL AND SEISMIC CRITERIA 15 i
10.0 COMMUNICATIONS 15 11.0 LIGHTING 15 12.0 GROUNDING SYSTEM 16 13.0 INSTRUMENTATION 17 14.0 LOCAL / REMOTE TRANSFER PANEL 18
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.f 18691-E-001(Q) 1.0 GENERAL INTRODUCTION AND SCOPE a
These criteria are the basis for the design of the electrical and control systems required for the 10 CFR 50 Appendix R upgrade to the Connecticut Yankee Plant. The criteria shall apply to new design as well as new interfaces (to existing systems and equipment) unless otherwise noted.
2.0 CODES AND STANDARDS The following codes, standards, and regulatory guides will be used as guidelines in the design of electrical and control sy;,ters and equipment.
Where required by law, such systems and equipment shall conform to the applicable codes and standards.
2.1 CODE OF FEDERAL REGULATIONS (10 CFR) 10 CFR Part 21, Reporting of Defects and Noncompliance 10 CFR Part 50, Domestic Licensing of Production and Utilization Faci-lities 50.48, Fire Protection 50.49, Environmental Qualification of Ele'ctric Equipment Important to Safety for Nuclear Power Plants 50.59, Changes, Tests, and Experiments Appendix A, General Design Criteria for Nuclear Power Plants (GDC)
Appendix B, Quality Assurance Programs of Nuclear Plants Appendix R, Fire Protection Program for Nuclear Power Facilities Operat-ing Prior to January 1979 2.2 NRC REGULATORY GUIDES Regulatory Guide No.1.6, Independence Between Redundant Standby (On-Site)
Power Sources and Between Their Distribution Systems Regulatory Guide No.1.22, Periodic Testing of Protection System Actuation Functions Regulatory Guide No.1.28, Quality Assurance Program Requirements (Design and Construction)
Regulatory Guide No. 1.30, Quality Assurance Requirements for the Installation, Inspection, and Testing of Instrumentation and Electric Equipment Regulatory Guide No.1.32, Criteria for Safety-Related Power Systems for Nuclear Power Plants -
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18691-E-001(Q)
Regulatory Guide No.1.40, Qualification Tests of Continuous-Duty Motors Installed Inside the Containment of Water-Cooled Nuclear Power Plants Regulatory Guide No. 1.41, Preoperational Testing of Redundant On-Site Electric Power Systems to Verify Proper Load Group Assignments 1 Regulatory Guide No. 1.47, Bypassed and Inoperable Status Indication for Plant Safety Systems Regulatory Guide No. 1.53, Application of the Single-Failure Criterion to Nuclear Power Plant Protection Systems t Regulatory Guide No.1.54, Quality Assurance Requirements for Protective Coatings Applied to Water Cooled Nuclear Power Plants Regulatory Guide No.1.60, Design Response Spectra for Seismic Design of Nuclear Power Plants Regulatory Guide No.1.61, Damping Values for Seismic Design of Nuclear Power Plants Regulatory Guide No.1.62, Manual Initiation of Protective Actions Regulatory Guide No. 3.63, Electric Penetration Assemblies in Containment Structures for Light-Water-Cooled Nuclear Power Plants Regulatory Guide No.1.64, Quality Assurance Requirements for the Design of Nuclear Power Plants Regulatory Guide No.1.75, Physical Independence Electric Systems Regulatory Guide No.1.76, Design Basis Tornado for Nuclear Power Plants Regulatory Guide No. 1.88, Collection, Storage, and Maintenance of Nuclear Power Plants Quality Assurance Records Regulatory Guide No.1.89, Qualification of Class IE Equipment for Nuclear Power Plants Regulatory Guide No.1.93, Availability of Electric Power Sources Regulatcry Guide No.1.97, Instrumentation for Light-Water-Cooled Nuclear Power Plants to Assess Plant and Environs Conditions During and Following an Accident ~
Regulatory Guide No. 1.100, Seismic Qualifications of Electric Equipment for Nuclear Power Plants Regulatory Guide No.1.106, Thermal Overload Protection for Electric Motors on Motor-Operated Valves '
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Regulatory Guide No. 1.115, Protection Against Low-Trajectory Turbine Missiles Regulatory Guide No.1.118, Periodic Testing of Electric Power and Protection Systems Regulatory Guide No.1.120, Fire Protection Guidelines for Nuclear Power Plants Regulatory Guide No. 1.122, Development of Floor Design Response Spectra for Seismic Design of Floor Supported Equipment or Components Regulatory Guide No.1.128, Installation Design and Installation of Large Lead Storage Batteries for Nuclear Power Plants Regulatory Guide No.1.129, Maintenance, Testing, and Replacement of Large Lead Storepe Batteries for Nuclear Power Plants Regulatory Guide No. 1.131, Qualification Tests of Electric Cables, Field Splices, and Connections for Light-Water-Cooled Nuclear Power Plants (For Comment) 2.3 NRC DOCUMENTS Standard Review Plan, NUREG-0800, and Attendant Branch Technical Posi-tions 2.4 I.E. NOTICE 85-09, Isolation Transfer Switches and Post-Fire Shutdown Capability 2.5 GENERIC LETTER 86-10, Implementation of Fire Protection Requirements 2.6 BRANCH TECHNICAL POSITIONS CMEB 9.5-1 (Formerly ASB 9.5-1), Guidelines for Fire Protection for Nuclear Power Plants 2.7 PROJECT DOCUMENTS Connecticut Yankee FOSA 2.8 IEEE STANDARDS IEEE-279-71, Criteria for Protection System.s of Nuclear Power Generating Stations IEEE-308-80, Criteria for Class IE Electric Systems for Nuclear Power Generating Stations 3 Rev. 0 .
186.91-E-001(Q)
IEEE-317-83, Electric Penetration Assemblies and Containment Structures for Nuclear Power Generating Stations .
IEEE-323-74, Qualifying Class IE Equipment for Nuclear Power Generating
, Stations ,
IEEE-334-74, Type Tests of Continuous Duty Class IE Motors for Nuclear Power Generating Stations i IEEE-336-85 (ANSI N45.24), Installation, Inspection, and Testing Require-ments for Power Instrumentation and Control Equipment at Nuclear Facilities '
IEEE-338-77, Standard Criteria for the Periodic Testing of Nuclear Power
- l Generating Station Safety Systems
, IEEE-344-75, Seismic Qualification of Class IE Equipment for Nuclear 4
Power Generating Stations IEEE-352-75, General Principles for Reliability Analysis of Nuclear Power Generating Station Protection Systems IEEE-379-77 (ANSI N41.2), Application of the Single Failure Criterion to Nuclear Power Generating Station Class IE Systems IEEE-382-85 (ANSI N41.6), Qualification of Actuators for Power Operated Valve Assemblies With Safety-Related Functions for Nuclear Power Plants IEEE-383-74, Type Test of Class IE Electric Cable, Field Splices, and Connections for Nuclear Power Generating Stations IEEE-384-81 (ANSI N41.14), Criteria for Independence of Class IE Equip-ment and Circuits IEEE-420-82 (ANSI N41.17), Design and Qualification of Class IE Control Boards, Panel, and Racks Used in Nuclear Power Generating Stations IEEE-450-80 (ANSI N41.15), Maintenance, Testing, and Replacement of '
Large Lead Storage Batteries for Generating Stations and Substations IEEE-484-81 (ANSI N41.24), Recommended Practice for Installation Design and Installation of Large Lead Storage Batteries for Generating Stations and Substations IEEE-494-74, Standard Method for Identification of Documents Related to Class 1E Equipment and Systems for Nuclear Power Generating Stations IEEE-498-85, Standard Requirements for Calibration and Control of Measur-ing and Test Equipment Used in the Nuclear Facilities
' IEEE-535-79, Standard for Qualification of Class IE Lead Storage Batteries ,
for Nuclear Power Generating Stations .
IEEE-566-77, Recommended Practice for the Design of Display and Control
- Facilities for Control Rooms of Nuclear Power Generating Stations 4 Rev. 0
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IEEE-567-(Draft), Trial Use Standard Criteria for the Design of the Control Room Complex for a Nuclear Power Generating Station IEEE-577-76, Requirements for Reliability Analyses in the Design and Operation of .
Safety Systems for Nuclear Power Generating Stations
- IEEE-603-80, Standard Criteria for Safety Systems for Nuclear Power Generating Stations IEEE-627-80, Standard for Design Qualification of Safety Systems Equip-ment Used in Nuclear Power Generating Stations !
IEEE-634-78, Cable Penetration Fire Stop Qualification Test IEEE-649-1980, Standard for Qualifying Class IE Motor Control Centers for Nuclear Power Generating Stations IEEE-650-1979, Standard for Qualification of Class IE Static Battery Chargers and Inverters for Nuclear Power Generating Stations 2.9 AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)
ANSI C37.04 (1979), Standards Rating Structure for ac High-Vf.1tage Circuit Breakers Rated on a $ymmetrical Current Basis ANSI C37.06 (1979), Preferred Ratings and Related Required Capabilities
- far ac High Voltage Circuit Breakers Rated on a Symmetrical Current Basis ANSI C37.09 (1979), Standard Test Procedure for ac High-Voltage Circuit '
Breakers Rated on a Symmetrical Current Basis ANSI C37.13 (1981), Standard for Low Voltage ac Power Circuit Breakers Used in Enclosures ANSI C37.16 (1980), Preferred Ratings, Related Requirements and Applica-tion Recommendations for Low Voltage Power Circuit Breakers and ac Power Circuit Protectors ANSI C37.17 (1979), Trip Devices for ac and General Purpose dc Low-Voltage Power Circuit Breakers ANSI C37.20 (1969), Standard for Switchgear Assemblies Including Metal-Enclosed Bus ANSI C37.90 (1978), Relays and Relay Systems Associated With Electric Power Apparatus ANSI C37.91 (1972), Guide for-Protective Relay Applications for Power Transformers ANSI C37.96 (1976), Guide for ac Motor Protection '
i j ANSI C37.97 (1979), Guide for Protective Relay Applications to Power System Busses l
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ANSI C37.98 (1978), Standard for Seismic Testing of Relays ANSI C39.1 (1971), Electrical Analog Indicating Instruments Requirements for Electrical Indicating Instruments ANSI C50.41 (1982), Polyphase Induction Motors for Power Generating Stations .
ANSI C57.13 (1978), Standard Requirements for Instrument Transformers ANSI C57.12.01 (1979), Requirements for Dry-Type Distribution and Power l Transformers ANSI C57.12.51 (1981), Requirements for Ventilated Dry-Type Power Transformers, 501 kVA and Larger ANSI N45.2 (1977), Requirements for Quality Assurance Program for Nuclear Power Plants ANSI N45.2.2 (1978), Packaging, Shipping, Receiving, Storage, and Handling of Items for Nuclear Power Plants ANSI 255.1 (1967), Gray Finishes for Industrial Apparatus and Equipment 2.10 INSULATED CABLE ENGINEERS ASSOCIATION (ICEA)
ICEA P-46-426 (1962), Power Cable Ampacities, Volume 1 - Copper Conduc-tors, and Cumulative Errata Sheets (1966) '
l ICEA P-54-440 (1975), Ampacities-Cable in Open-Top Cable Trays ICEA S-19-81 (1980), Rubber Insulated Wire and Cable for the Transmission and Distribution of Electrical Energy ICEA S-61-402 (1979), Thermoplastic Insulated Wire and Ca'ble for the Transmission and Distribution of Electric Energy '
Interim Standard No. 1 (1976) to ICEA S-68-165, Cables Rated 0-35,000 V and {
Having Ozone-Resistant Ethylene-Propylene Rubber Insulat'i'n o '
ICEA S-66-524 (1982), Cross-Linked-Thermosetting-Polyeth'ylene-Insulated Wire and Cable for the Transmission and Distribution of. Electrical Energy 2.11 NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)
NEMA AB-1 (1975), Molded Case Circuit Breakers NEMA ICS (1983) (Excluding Part 3), Industrial Controls and Systems NEMA MG-1 (1978), Motors and Generators NEMA MG-2 (1982), Safety Standard for Construction and Guide for Selec-tion, Installation, and Use of Electrical Motors and Generators 6 Rev. 0
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NEMA PB-1 (1984), Panelboards NEMA PB-2 (1984), Switchboards, Deadfront Distribution NEMA SG-3 (1981), Low Voltage Power Circuit Breakers NEMA SG-4 (1977-), ac High Voltage Circuit Breakers NEMA SG-5 (1981), Power Switchgear Assemblies NEMA TR-1 (1980), Transformers, Regulators, and Reactors NEMA TC-3 (1982), PVC Fittings for Use With Rigid PVC Conduit and Tubing NEMA TC-6 (1983), Plastic Utilities Duct for Underground Installation NEMA VE-1 (1971), Cable Trays, Ventilated NEMA WC-21 (1967), Nonreturnable Reels NEMA WC-25 (1975), Protective Covering for Wire and Cable Reels NEMA PV-5 (1976), Constant Potential Type Electrical Utility (Semi-Conductor Static Converter) Battery Charger NEMA FB-10 (1973), General Requirements for Plugs, Receptacles, and Connectors of the Pin and Sleeve Type 2.12 UNDERWRITERS LABORATORIES, INC. (UL)
UL Standard 845-1971, Standard for Motor Control Centers UL Standard 50-1974, Cabinets and Boxes UL Standard 67-1974, Panelboards UL Standard 891-1976, Dead Front Switchboards 2.14 NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)
NFPA 70, National Electrical Code NFPA 78, Lightning Protection Code 2.15 NATIONAL ENERGY PROPERTY INSURANCE ASSOCIATION NEPIA - Basic Fire Protection for Nuclear Power Plants 3.0 AC POWER SYSTEM DESIGN 3.1 GENERAL DESCRIPTION The Class IE divisions' existing 4.16 kV bus will supply a 480 V load center which in turn will feed a 480 V motor control center (MCC). The 7 Rev. 0
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18691-E-001(Q) load center transformer will be a three phase, ' delta-connected primary and delta connected secondary. In case the normal feed to the load center is unavailable' the load center may be fed from an existing load center bus (bus 6) crosstie by manually transferring the supply.
The ac power system and components will be designed with sufficient rating and capacity to supply the identified loads of the load center and MCC under worst case conditions.
3.2 VOLTAGE RANGE - SYSTEM The voltage range of the existing 4.16 kV (nominal) bus which supplies the load center is as given in NUSCO Calculation 76-633-40-GE, Rev. O.
3.3 MOTORS Existing motors connected to the load center or MCC are capable of running continuously at 10 percent of rated motor voltage and starting at a minimum of 80 percent of rated motor voltage.
New motors will be purchased consistent with the aforementioned require-ments and will be rated at 440 V with a 1.15 service factor.
3.4 VOLTAGE REGULATION The system design will allow for the largest motor starting with all other loads running given the voltage ranges of Section 3.2 and maximum loading conditions.
Equipment voltages will not exceed the maximum allowable value (based on Section 3.3).
Lighting system conductors will be sized to limit voltage drop to 3 per-cent in branch circuits or a total of 5 percent on feeder and branch circuits combined to the most remote fixture outlet.
3.5 FAULT CALCULATIONS The maximum short circuit current will be calculated based on the fol-lowing:
- a. Maximum system voltage (at the 4.16 kV bus)
- b. Transformer impedances based on nominal value reduced by the manufacturer's tolerance
- c. Available maximum fault current at the 4.16 kV bus 9 is given by NUSCO as 30,805 A~,' including system, motor, and one diesel i
generator's contribution i
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- d. The maximum fault current at bus 11 will be on the larger of l l
the two available fault levels from bus 6 or via the 4.16 kV l bus 9 feed.
3.6 INTERRyPTINGDUTYANDWITHSTAND The electrical system and equipment will be able to withstand and inter-1 rupt the maximum available fault current calculated on the basis of the data in Section 3.5.
3.7 PROTECTIVE RELAYING Protective relaying and fault detection will be provided to limit equip- -
ment damage, alert the operator to abnormal operating conditions, coordinate with other protective devices, selectively isolate faulted equipment, and provide backup protection in the event of failure of the primary protection.
3.8 LOAD CENTER 3.8.1 General Load center breakers will be equipped with static trip devices. The main and MCC feeder breakers will be equipped with long-time and short-time trips. Motor feeder breakers will be equipped with long-time and instan-taneous trips.
The load center bus will contain a ground fault detection scheme to alert plant operators of a single ground fault condition.
The load center unit substation will consist of an incoming-line section, transformer, and low voltage section with metal-clad enclosed drawout power circuit breakers. The load center will supply the motor control center and, generally, motors from 50 hp up to 250 hp. Load center
' operation via the cross tie (existing bus 6) will be limited by the smaller value of either cross tie breaker setting or the load center transformer rating with possible load reduction necessary. The load center transformer will be open ventilated, dry type with forced air (FA) l cooling.
3.8.2 Grounding The 480 V system will be ungrounded, consistent with the existing busses
- at the plant.
3.9 MOTOR CONTROL CENTER The motor control center will consist of vertical sections joined together
' to form a rigid, freestanding, enclosed control assembly. The sections will be divided into individual compartments. Generally, the motor control centers will supply motors rated 440 V and 460 V and less than 50 hp. Motors above 50 hp which are reversible, two speed, or subject to extreme cycling may be connected to MCCs.
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Motor control center units will be removable and interchangeable.
Plug-in type load connectors to the bus will be provided in general.
i Short circuit protection of combination motor starters will be provided l
by circuit breakers equipped with adjustable instantaneous magnetic trip elements. Running protection of the motors will be provided by overload
! elements in each pole of the motor starters. The overload elements will have long-time trip characteristics which approximate the heating curves of the motors. Protection of a feeder tap unit will be provided by circuit breakers equipped with inverse time thermal overload protection and instantaneous magnetic short circuit protection on each pole.
Fuses will be added to selected MCC cubicles to provide backup circuit protection for penetrations to comply with NRC Regulatory Guide 1.63.
During start-up, all starters for motor-operated valves will be equipped with thermal overload relays. The thermal overload relay tr'ip contacts forpower to all Class 1E valves will not be permanently bypassed with jumpers prior operation.
However, the intent of Regulatory Guide 1.106, Position C.2 will be complied with.
4.0 DC POWER SYSTEM DESIGN 4.1 GENERAL DESCRIPTION The de system will consist of two independent batteries and associated battery chargers, distribution panels, and breakers. One of these load groups will be Class IE and the other non-Class 1E.
4.2 BATTERY CHARGERS The Class IE battery charger in the new room will be supplied from the Class 1E MCC discussed in Section 3.1, whereas the battery charger in the existing switchgear in the power block. room will be supplied from an existing Class 1E MCC The capacity of the IE charger will be based on the largest combined demands of the various steady state loads and the charging capacity required to restore the battery from the design minimum charge state to the fully charged state within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
The capacity of the charger in the existing switchgear room will be based on the larger of either the largest single running load or the capacity required to restore the battery from the design minimum charge state to I the fully charged state within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Instrumentation charger will be provided to monitor the status of the battery as follows: {
)
- a. Output voltage
- b. Output current 10 Rev. 0
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18691-E-001(Q)
- c. Charger breaker position indication
- d. Charger malfunction alarm 4.3 BATTER,IES BoththeClasiIEandnon-ClassIEbatterieswillbeexistingbatteries furnished by NUSCO. The batteries are lead calcium type consisting of 60 cells each, with an output of 2.2 V per cell. The adequacy of these existing batteries to supply the load requirements will be verified based on C&D or Hoxie methods for ampere hour capacity determination.
The Class 1E battery will have sufficient capacity to supply its load for no less than 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> without charger support.
4.4 DC VOLTAGE REGULATION Control and power circuit voltage drops will be-calculated to ensure that devices will operate based on using worst case resistances and a minimum de system voltage of 105 V dc (with battery in a fully dis-charged state without charger support).
Equipment (motors, etc.) will be compatible with a dc voltage range of 90 V de to 140 V dc.
- 5. 0 VITAL AC SYSTEM 5.1 GENERAL DESCRIPTION The vital at system will consist of two Class 1E inverters and correspond-ing distribution panels.
dc distribution panel. Upon Both inverters will be fed from the Class 1E loss of incoming ac power to the Class 1E
' charger, or loss of the charger, uninterrupted power will be supplied to the inverters from the Class IE battery. During inverter repair, a manual transfer to a bypass ac supply may be initiated.
5.2 INVERTERS Inverters output voltage will be 115 V at 12 percent, 60 Hz. The inverters will be the normal source for vital ac loads. A manual transfer switch will be provided to transfer the inverter load to the other inverter during periods of maintenance. A static transfer switch ,
l will be provided to automatically transfer the vital ac load to an alter-nate source upon inverter failure. This alternate source will be from a i i Class IE supply conditioned by a voltage regulating transformer. The j inverter output will remain in synchronism with the alternate source to ensure a continuous source.of reliable power to the ac loads.
A minimum of 20 percent spare capacity will be provided for the inverters for future additions.
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-6.0 CABLES 6.1 GENERAL DESCRIPTION The followi,og types of cables will be provided:
- a. 5 kV power cable
. b. 1,000 V power and 600 V control cable
{ c. Instrument cables and special cables All cables will be suitable for wet applications. All cables will be -
purchased as Class IE, except for lighting, fire protection, security, and communication system cables.
6.1.1 Power'and Control Cables The power cables for the 4.16 kV systems will be rated 5 kV for ungrounded applications. The conductors will be copper, Class B stranded. The conductors will be insulated with an ethylene propylene rubbar compound rated for 90 C conductor temperature. Each insulated conductor will be protected with a Hypalon (chlorosulfonated polyethylene) jacket. Compounds which can be demonstrated as being equal to EPR or Hypalon will also be considered for these cables.
In general, triplex cable assemblies will be used for cables up to and including AWG No. 500 MCM for all power cable. Single conductors will be used above 500 MCM.
The 1000 V power and 600 V control cable will be single conductor or multiple conductor, as required. The cables will be rated for 90 C )
conductor temperature. Insulation and jacketing material for the 1000 V power cables will be the same as that previously described. Control .
l l cables will be flame-retardant, cross-linked polyethylene insulated with 4
an overall neoprene jacket.
l 6.1.2 Instrumentation Cable
- Instrumentation cables for low level signals will be twisted and shielded ;
i to reduce noise pickup. The 600 V instrumentation cable will be rated at !
90 C.
6.2 AMPACITY AND CABLE D:2ATING i
Ampacity rating and group derating factors of cables will be in r cor-dance with ICEA P-46-426 for cables in conduit, ducts, and maintained space tray. ICEA P-54-440 will be used for cables in random filled tray.
l In determining the cable sizes for the various services, the following i
load factors will be used:
- a. Transformer feeders - 100 percent of transformer rating
- b. Motor feeders - 125 percent of motor full load current 12 Rev. O i , __ __ _ _ , . _ _ _- _ - - - _ _ _ _ _ _ - _ . _ _ , _ _ - _ _ _ _ _ _ _ _ _ _
18691-E-001(Q)
- c. Load center /MCC feeders - 100 percent of the bus rating plus 25 percent of the full load current rating of the largest motor which can be connected to the bus
- d. Ac,and de distribution panel branch circuits - 100 percent of the ma'ximum load to be served or the protective device. Where the.
ampacity of the conductor does not correspond with the standard fuse or breaker size, the next higher device rating may be used.
Minimum cable sizes will also be established for power cables. The study will consider the available fault current, fault duration, and conductor temperature rise.
6.3 The 5 kV, 1000 V load center subfeeder cables and de bus tie cables will be designed for maintained spacing in tray installations or ductbank installation as applicable and derated accordingly.
7.0 SEPARATION CRITERIA 7.1 VOLTAGE CLASS SEPARATION Cables will be assigned to raceways based on their voltage ratings as follows:
- a. 5 kV power cable
- b. 1000 V power cables where maintained spacing is required (refer to Section 8.2.3)
- c. 1000 V power and 600 V control and digital / signal cables (refer to Section 8.2.1)
- d. Instrumentat'on cables 7.2 SEPARATION PER REGULATORY GUIDE 1.75 AND IEEE-384 Cables and raceways wil' be designed to meet the requirements of Regu-latory Guide 1.75 and the applicable portions of IEEE-384.
In cases where, in the exiting power block, such requirements may not be viable,. exceptions may be taken. Such exceptions will be documented on a case-by-case basis.
7.3 SEPARATION OF CABLES AND RACEWAYS PER 10 CFR 50, APPENDIX R, SECTION III G i
Those cables and raceways identified by NUSCO as supporting the safe l shutdown capability of the pla'nt will be designed to meet the separation requirements of 10 CFR 50, Appendix R, Section III G.
Any exceptions to these requirements which may be necessary in the existing power block will be documented to the client as a request for exemption to the NRC on a case-by-case basis, as required.
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l 8.0 RACEWAY SYSTEMS Generally the raceway system and equipment layout will conform to the following criteria:
8.1 RACEWAY SYSTEMS Exposed racewaf systems will consist either of cable trays arranged in a main distribution pattern with either trays or conduits branching to individual equipment and devices or may be totally routed in conduit.
Embedded raceway systems will consist of conduits embedded in building floors, walls, or other structures and conduits installed in concrete underground duct banks.
Cable trays will be galvanized steel ladder type with 9-inch rung spacing, various radius fittings, and 4-inch loading depth.
Exposed conduit.will be galvanized steel intermediate metal conduit (IMC) or standard weight galvanized rigid steel. All conduit embedded in building slabs or walls will be galvanized rigid steel, IMC or EMC.
! A section of flexible steel conduit will be used at the connection to all equipment and devices subject to removal or vibration. Liquid-tight-flexible metal conduit will be used in wet areas.
All conduit in underground ductbanks will be polyvinyl chloride (PVC) type DB in accordance with NEMA TC-6-1974 or galvanized IMC.
8.2 RACEWAY FILL ,
8.2.1 Random Filled Tray (Low Voltage Power and Control)
The MCC subfeeder power and control cables will be designed for random fill tray installation with the derating based on 40 percent of a 4-inch loading depth. Fills greater than 40 percent may be allowed as an exception, based on an individual case review for adequacy.
8.2.2 Instrumentation Tray Instrumentation cables will be designed for random fill tray installation based on a 60 percent fill of a 4-inch loading depth cable tray. Fills greater than 60 percent may be allowed provided the total fill does not protrude above the loading depth of the tray.
8.2.3 Maintained Space Tray Trays which contain 5 kV cables, load center feeders, and dc bus ties '
will be designed for a maintained spacing.
8.2.4 conduit Conduit fill will be in compliance with the provisions of Chapter 9 (Table 4) of the NEC. I 14 Rev. 0
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r 18691-E-001(Q) i 9.0 ENVIRONMENTAL AND SEISMIC CRITERIA 9.1 ENVIRONMENTAL Class IE equipment and cables will be designed to be suitable for use in their environment and will meet IEEE-323 and (for cables only) IEEE-383.
For specific environmental parameters to be used in the specification and design of equipment / cables in the new switchgear building, refer to Mechanical Design Criteria 18691-M-001.
Environmental parameters applicable to equipment / cables in the existing power block will be obtained from NUSCO.
9.2 SEISMIC Class IE equipment and raceway systems will be designed to the require-ments of IEEE-344.
For specific response spectra applicable to the new switchgear building, refer to project documents, " Floor Response Spectra - New Switchgear Building." For specific response spectra applicable to the existing power block, refer to the project documents.
9.3 II OVER I CRITERIA Raceways shall be designed such that, where seismic Category II raceway is routed above seismic Category I raceway or equipment, sufficient protection for the Category I raceway / equipment shall be afforded from the deleterious effects of Seismic Category II raceway failures.
10.0 COMMUNICATIONS The communications system will include public address and call systems with loud speakers, speaker amplifiers, and plant telephone units.
Associated raceway and junction boxes will be provided. This communica-tion system will interface with the existing plant communication system at the PBX room located in the administration building.
11.0 LIGHTING 11.1 The lighting in the new switchgear building will consist of the following types:
- a. Normal lighting
- b. Emergency lighting Normal lighting will be designed for lighting intensities equal to or greater than those recommended by the Illuminating Engineering Society (IES) for the interior of a generating station and per Standard Review Plan Section 9.5.3.
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The emergency lighting consists of lighting for meeting Appendix R and B0CA Basic / National Building Code.
The Appendix R emergency lighting will have 8-hour battery packs and will be designed to meet the following levels:
o 5 footcandles at control boards and work stations when gages will be read and adjustments to system operation will be made.
o 2 footcandles at task points where occasional tasks will be performed, such as valve and breaker positioning.
. o 2 footcandles on access / egress routes at hazard points, includ-i ing stairs and obstacles.
o 0.5 footcandles for nonhazardous access / egress routes.
The emergency lighting for meeting BOCA code will have battery packs rated for 90 minutes of operation.
12.0 GROUNDING SYSTEM h
A ground grid consisting of bare copper cable will be provided over the new switchgear building area for personnel safety and to provide facilities for systems, structures, and equipment grounding.
' Beams and structural steel members are either tied directly to the grounding system via bare 4/0 AWG copper wire or v.ia metal-to-metal
- contact if the structural etc. system is not isolated.
Grounding conductors will be of sufficient size to carry the maximum ground fault current.
Conductors will be located to limit touch and step potentials to safe values under calculated fault conditions.
Switchgear, 480 V load centers, and 480 V MCCs will be connected directly to the copper grounding system at a minimum of two places. Equipment enclosures and local control cabinets will be connected to the nearest point of the grounding system. Ground cables installed along beams are run on the inside of the flange adjacent to the web where practical.
Where conduit is used as the ground fault return conductor, the conduit will be connected to the tray with a grounding conduit clamp or to the copper cable on the tray. The conductor from the conduit to the cable on the tray will be sized in accordance with Table 250-95 of the National Electric Code. Where flexible conduit is attached to steel conduit being used as the ground fault return conductor, the flexible conduit will be
!. jumpered with bare copper cable.
4 At least one end of all metallic conduit and extensions to nonmetallic conduit will be connected to the grounding system.
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An instrumentation ground bus at the remote instrumentation panel will be :
provided as a single point ground tied to the plant ground system at one point only via an insulated cable to the ground grid.
13.0 INSTRUMENTATION 13.1 SYSTEM DESIGN Systems will be designed to provide selected process indications on a remote instrumenation panel to be located in the new switchgear building.
The process indications include:
o Pressurizer level and pressure o Loop pressure (loops 1 and 4) o Steam generator level and pressure (four steam generators) o Demineralized water storage tank level o Reactor coolant temperature (four hot leg and four cold leg) o Source range neutron monitor A new controller for the boric acid metering pump will be installed in the new switchgear building. The design for installation of the electronic transmitters and tubing inside containment will be QA Category I, seismic.
The signals to the remote instrument panel are non-Class 1E.
13.2 TRANSMITTERS Seven new pressure and five new differential pressure transmitters will be provided for pressure and level sensing. Existing sensing instruments will be used for the reactor coolant hot and cold leg temperatures.
These signals are Class 1E. An isolating device will be provided for the RTD signals sent to the remote instrument panel.
13.3 METERING PUMPS The existing pneumatic actuator for control of the boric acid metering pump speed will be replaced with a nonpneumatic actuator qualified for the services. The metering pump controller in the new switchgear build-ing will be Class 1E.
13.4 REMOTE INSTRUMENTATION PANEL A now remote instrument panel will be designed for installation in the new switchgear building. The' panel will contain reacess indicators and transmitter power supplies. The panel design will be for non-Class IE equipment.
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, 13.5 INDICATORS The process indicators which will be installed on the panel will not be qualified for Class 1E service.
14.0 LOCAL / REMOTE TRANSFER PANEL A local / remote transfer panel will be provided for installation in the new switchgear building. The panel will contain local / remote control switches and auxiliary relays. These devices will be used for isolation and redirection of control circuits. The panel and its components will be Class IE.
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Attachment 2 B12480 SECTION 4 CONSTRUCTION DRA'#INGS i
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SEE APERTURE CARDS NUMBER OF OVERSIZE PAGES FILMED ON APERTURE CARDS b APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH,TIDC
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