ML20058J888

Design Rept for Facility Station Blackout/Electrical Safeguards Upgrade Project

ML20058J888
Person / Time
Site:	Prairie Island
Issue date:	10/15/1990
From:	NORTHERN STATES POWER CO.
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ML20058J887	List: ML20058J883 ML20058J888
References
NUDOCS 9012060065
Download: ML20058J888 (196)

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, DESIGN REPORT 1

NORTHERN STATES POWER COMPANY t PRAIRIE ISLAND NUCLEAR GENERATING PLANT STATION BLACK 0UT/ ELECTRICAL SAFEGUARDS UPGRADE PROJECT OCTOBER 15, 1990 a

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4 f NORTHERN STATES POWER COMPANY PRAIRIE' ISLAND NUCLEAR GENERATING PLANT CONTENTS

1.1 INTRODUCTION

1.2 CONTENTS OF DESIGN REPORT

1.3 BACKGROUND

REVIEW OF STATION BLACKOUT PROGRAM 1.3.1 Reaulatory History i 1.3.2 Industry Position 1.3.3 Prairie Island Plant Soecific Studies 1.4 SBO/ESU PROGRAM OBJECTIVE AND. GOALS ,

1.5 RESPONSE TO THE NRC RULE ON STATION BLACKOUT 1.6 ELECTRICAL SAFEGUARDS UPGRADE 1.7 DEFINITIONS 1.8- REFERENCES

2.0 OVERVIEW

EXISTING DESIGN AND UPGRADED DESIGN 2.1 . EXISTING SAFEGUARDS AUXILIARY POWER SYSTEM 2.2 UPGRADED SAFEGUARDS AUXILIARY POWER SYSTEM 2.2.1 DS and D6 Diesel Generators and 'i Succort Systems '

2'.2.2 Safeauards Electrical System i

3 ; 0- DIESEL GENERATOR AND AUXILIARY SYSTEMS -

DESIGN AND .>

. -, ; INSTALLATION

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3.1 SEISMIC' DESIGN. CLASSIFICATION 5

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l' 3.1.1 Diesel Encine Auxiliary Systems 3.1.2 Diesel Generator- Room Ventilation -

System 3.1.3 El.g.gtric -Power Distribution.

Switchaear, and Controls 3.1.'4 Fuel Oil Storace and Transfer System L

3.2 SAFETY' DESIGN CLASSIFICATION

• l 3.2.1 Diesel'Encine Auxiliary Systems '

3.2.2 Diesel Generator Room Ventilation Systems

3.'2.3 Electric Power Distribution and Controls

-3.2.4 Fuel Oil Storace and Transfer System i

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NORTHERN STATES POWER COMPANY I PRAIRIE ISLAND NUCLEAR GENERATING PLANT l CONTENTS 3.3 SYSTEM DESIGN AND INSTALLATION 3.3.1 Diesel Encine Coolina System 3.3.2 Diesel Fuel Oil System 3.3.3 Diesel Air Startina System 3.3.4 Diesel Lube Oil System 3.3.5 Diesel ' Combustion Air and Exhaust System 3.3.6 Diesel Generator Room Ventilation Systems i

3.3..7 Pioina Reauirements and Materii ls 3.3.8 Mechanical Desian and Fabrication Codes 3.3.9 Electrical Power Distributior . .and

, Switchaear 3.3.10 Diesel Generator Controls 2 Indication, and Alarms 3.3.11 Diesel Generator Operatina Descriotion 3.4 FUEL OIL STORAGE SYSTEM

, 3.4.1 Functional Recuirements and D.gperiotion 3.4.2 Desian Recuirements 3.5- DESIGN STANDARDS 3.5.1 NUREG 0800 Standard Review Plan (SRP) g 3.5.2 IEEE Standardg

t. 3.5.3 Reaulatorv> Guide,g

, < 3.5.4 NFPA Standards; w . 3. 5. 5 - ANSI Standards.

3.5.6' Northern States Power Standards' '

3.5.7 Fluor' Daniel Procedures

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4 '. 0 NEW DS/D6 BUILDING l 4.1 SEISMIC DESIGN CLASSIFICATION 4.1.1 Structures ,

4.1.2 Electrical / Mechanical /HVAC Buildina Succort Systems 4.2 SAFETY DESIGN CLASSIFICATION 1,

4.2.1 Structure _E 4.2.2 Buildina Succort Systems 11

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'" 4.3 BUILDING STRUCTURE DESIGN y 4.3.1 Desian Loads '

4.3.2 Structural Desian Basis Ub 4. 3. 3. Construction Materials ff 4.3.4 Load Combinations 4.3.5 Desian and Analysis Procedures 4.3.6 Structural Accentance Criteria

w 4.3.7 Structural / Architectural Fire f I

Protection Recuirements 4.3.8 Buildina ExteriorOneninas 4.4 BUILDING ELECTRICAL DESIGN 4.4.1 Lichtina 4.4.2 Power Distribution and Loads

,'l 4.4.3 Grounding  !

4.4.4 Communications i

_k, 4.4.5 Fire Detection 4.4.6 Escurity ,

-;y(_ y 4.4.7 Radiation Monitorina 1

'$i 4.5- BUILDING / MECHANICAL /HVAC DESIGN d.

' "L - 4 . 5.1- Fire Protection System Function Y[' ' 4.5.2 Plumbine '7ra ins - ,

'i 4.5.3 (HVAC) Heatina. Ventilation, and Air

'l(,p Conditionina 1 li, 4.5.4 Station Air Reauirements 4 M"#I i 4.6 DESIGN STANDARDS- 1

) 4.6.1 ,NUREG/CR - 0660 Enhancement of Onsite-n , Emeraency Diesel Generator Reliability .

p 4.6.2 NUREG'0800 Standard Review Plan (SRP) 4.6.3. IEEE Standards "y 4.6.4 Reaulations and Reculatory Guides-x 4.6.5 NFPA Standards 4.6.6 ANSI Standards

, 4.6.7 Buildina Codes-- l

, 4.6.8 Forthern States Power Standards 4.6.9 Other Reference Documents

_ ]('[ , 4.6.10 Ouality Assurance Procram h'

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w NORTHERN STATES POWER COMPANY n PRAIRIE ISLAND NUCLEAR GENERATING PLANT 9 CONTENTS

5. 0 - DIESEL GENERATOR Ii1TERFACE AND ELECTRICAL SAFEGUARDS UPGRADE 5.1 SEISMIC DESIGN CLASSIFICATION 5.2- SAFETY DESIGN CLASSIFICATION

.i 5.3 UPGRADED SAFEGUARDS AUXILIARY AC POWER SYSTEM

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s 5.3.1 G_9neral Descriotion 5.3.2 Preferred. Alternate, and Standby 4

Egy,g,r Source Conficuration 5.3.3 4160V Confiauration - Safeauards D.RE9.E 5.3.4 480V Confiauration - Safeauards Buses 5.3.5 yoltace Restoration / Load Reiection/ Load Restoration 5.3.6 Emeraency Resoonse Computer System 5.3.7 -D5/D6 Control Scheme Tie-In With-Existina Plant

5. 3. 8 ' Main Control Room G " Panel Modifications 5.3.9 Detailed Desian 5.4 DESIGN STANDARDS 5.4.1 NUREG 0800 Standard Review Plan (SRPI 5.4.2 IEEE Standards 5.4.3 Reculatory Guides 6.0 COOLING WATER SYSTEM 6.1 SYSTEM FUNCTION 6.2 121 COOLING WATER PUMP UPGRADE 7 '. 0 IMPLEMENTATION PLAN 8.0' SAFEGUARDS AUXILIARY POWER SYSTEM OPERATION 8.1 EXISTING SAFEGUARDS AUXILIARY POWER SYSTEM-DESCRIPTION-8.2 EXISTING : SAFEGUARDS AUXILIARY POWER SYSTEM OPERATION' 8.3 UPGRADED SAFEGUARDS AUXILIARY POWER SYSTEM DESCRIPTION 8.4 UPGRADED SAFEGUARDS AUXILIARY POWER SYSTEM' OPERATION iv

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NORTHERN STATES POWER COMPANY

, PRAIRIE ISLAND NUCLEAR GENERATING PLANT l

.QQRTEN_TS FIGURES  :

Figure 2-1 Existing One-Line Electrical Diagram of '

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the Emergency AC Power System

-Figure 2-2 Upgraded One-Line Electrical Diagram of the Emergency AC Power System Figure 3-1 DS HT Cooling Water System ,

a Figure 3-2 DS LT Cooling Water System Figure 3-3' D6 HT Cooling Water-System Figure 3-4 D6 LT Cooling Water System Figure 3 D5/D6 Fuel Oil System Figure 3 D5 Fuel Oil System Figure 3-7 D6 Fuel-Oil Systems.

Figure 3-8 D5 Starting Air System Figure 3-9 D6 Starting Air System Figure 3-10 D5 Lube Oil System-

-Figure 3-11 D6 Lube. Oil System Figure 3-12 ,DS. Combustion Air & Exhaust System  ;

L Figure ~3-13 D6 Combustion Air & Exhaust System F

Figure 4-1 Arrangement of New DS/D6 Building and CSTS 21 and 22

. Figure 4-2 DS/D6 Building Ground Floor >

l Figure.4-3 D5/D6 Building Mezzanine Floor a L Figure 4-4' D5/D6' Building Operating Floor Figure.4-5 D5/06EBuilding Upper Deck k l a Figure 4-6 D5/D6, Building Roof Figure 4-7! D5/D6 Building Elevation Figure _4-8  : D5/D6 Building Elevation u Figure 4-9 DS/D61 Building Fuel Oil-Storage Vault ,

l &, Basement '

l l Figure 6-1 Cooling Water System Simplified Flow- ,

t 1 Diagram

? Figure 6 Cooling Water Screenhouse.

1 Figure'7 D.G. Building Implementation Plan l ' Figure 7-2 DS/D6 D. G. Installation Implementation Figuro'7-3 . Plant Interface Implementation Plan l

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NORTHERN'8TATES POWER CONPANY PRAIRIE ISLAND NUCLEAR GENERATING PLANT CONTENTS TABLES

' Table 2-A Diesel Generator Loading: DBA in First Unit and Hot Shutdown for Second Unit (Load) as a Function of Time Table =4-A Damping Factors Table 4-B Tornado Generated Missiles E

Table 4-C Fire Barriers

n. Table 8-A Existing and Proposed Voltage Restoration

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Sequence Table 8-B Proposed Loading Sequence ATTACHMENTS 5-A ,

Electrical Cable and Cable Tray Coding t

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NORTHERN STATES POWER COMPANY PRAIRIE ISLAND NUCLEAR GENERATING PLANT STATION BLACKOUT / ELECTRICAL SAFEGUARD 8 UPGRADE PROGRAM .

DESIGN REPORT l

1.1 INTRODUCTION

This Station Blackout / Electrical Safeguards Upgrade (SBO/ESU) Design Report provides the following: I a) Background information and descriptions of the existing Prairie Island emergency power system.

I b)- Information :.nd discussion on the SBO/ESU Program hardware additions which includes two additional new emergency diesel generators, a new building and new electrical distribution equipment.

c) Information regarding the proposed operation of the modified emergency power system.

The. introductory section provides a background review of the Station Blackout issue,. the SBO/ESU Program objective and goals, and the _ NSP response to the NRC rule c Station Blackout, which includes a summary of the hardware modifications, e-This report is being prov.ided to the NRC to support NRC staff approval. A. separate . submittal containing the .'

Safety Evaluation, proposed Technical Specification changes, and.tho'Significant Hazards Analysis will be' >

docketed later in 1990. ,

t 1.2' CONTENTS OF DESIGN REPORT l This report contains the following sections:

Section 1.0 provides an introduction and background for the Station Blackout and Electrical Safeguards Upgrade (SBO/ESU) Program.

Section 2.0 provides an overview of the existing emergency power distribution system and an overview of the revised energency power distribution - system which

. includes two additional diesel. generators, D5 and D6, and upgraded electrical safeguards 4kV and 480V systems.

Section 3.0 discusses the design and installation of the D5 and D6 safety-related diesel generators.

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U Section 4.0 discusses the design' and installation of the C new D5/D6 Building and support systems, and the J.L relocation of two existing condensate Storage Tanks that 3 stand on the new building site.

W Section 5.0 discusses the interface of the new emergency diesel generators to the electrical. safeguards A distribution system and the upgrade of the electrical N: safeguard 4kV and 480V distribution systems.

Section 6.0 discusses the repowering of the 121 Cooling Water Pump to increase the reliability of the Cooling Water System.

2" Section 7.0 discusses the implementation plan for the addition of the diesel generators and the electrical system upgrade.

Section 8.0 discusses the operation of the existing L emergency power system and of the proposed systems L for Unit 1 and Unit.2,

1.3 BACKGROUND

REVIEW OF STATION BLACKOUT PROGRAM This section provides a summary of the Station Blackout

. Issue (SBO) from its inception in 1975 to its resolution through the efforts of the Nuclear Utility Management and Resources Council' (NUMARC) and the Nuclear Regulatory Commission (NRC).

1.3.1 Reculatory History-The Reactor Safety Study (WASH-1400) issue in 1975 showed

.that station-blackout was'a'significant contributor to

-the- potential total risk-. from. nuclear . power plant'

' accidents. 'The NRC designated station. blackout as an Unresolved Safety Issue USI A-44 and issued a Task Action Plan, TAP ~A-44, in July 1980. '

u The NRC staff researched' vari'ous ' aspects of the issue through. supporting contractors, documenting the research '

results in various NUREG reports. This effort' culminated with presentat' ion of the NRC staff's technical findings in NUREG-1032. issued on June 15,'1985.

The NRC identified proposed rulemaking .in the Federal

-Register, Vol. 51,.No. 55, March ' 21, 1986. The NRC proposed to amend regulation 10 CFR Part.50 by adding section 50.63 and by adding'a ' paragraph to General-Design I. Criteria 17, Appendix ' A- of 10 CFR part 50. These additions would require that al'1 nuclear power plants be capable of coping with a station blackout for some specified period of time. Additionally, the ;:RC proposed issuance of a Regulatory Guide on Station Blackout to N$P D6 2

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50.63'of 10 CFR Part 50.

The draft Regulatory Guide was first issued for comment in March 1986. The final Regulatory Guide 1.155, Station Blackout, was issued in June 1988.

On June 21, 1988, the NRC issued the final rule on Station Blackout which endorses the approach contained in _ the nuclear industry report NUMARC 87-00 as an acceptable method for meeting the requirements of the rule. This rule became effective July 21, 1988. The intent of the rule was to reduce the contribution of station blackout to the overall risk of a core meltdown.

" IDiuytry Position 1.3.2 The nuclar utility industry formed a working group under NUMARC-that developed a guideline for responding to the Station Bl e kout Issue. This group, the Nuclear Utility Group- for Stet $ on Blackout (NUGSBO), produced a guide n (NUMARC 87-00) for evaluating the probability for a plant to encounter a station ' blackout condition. It also-

't presented five initiatives for plants to ese to address the more important contributors to station bleckout '

events. This ' guide also established a method to

, determine the minimum required coping time for each plant ,

to be able ~- to maintain reactor core and NSSS systems i integrity until AC power is returned. i 1.3.3 Prairie' Island Plant Specific Studies' Two- studies' were completed.. by. teams consisting ',

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. representatives from P.lant Engineering, Plant Operations, Nuclear Technical Secryices , Nuclear ~ Engineering and Construction, Production . Plant Maintenance and a consultant engineer, Fluor Daniel, Inc.

The Station . - Blackout Coping ' Study .w as completed in September' 1987. This study showed that '. the Prairie:

Island Plant can safely respond to: a Station Blackout condition of four hour duration as determined 'by the analysis required in NUMARC~87-00. This. study was done based on the configuration which will exist when Prairiet o Island'has met the NUMARC SBO Initiatives.

The' NUMARC ' Initiatives express relative risk ' by ' the number of hours the assumed' loss of all normal sources of safeguards AC power continues. This is called the

" coping duration". Plants with a less secure power supply system have to be able to cope 'with a blackout for a longer period of time. NUMARC's position is that if a plant's coping duration is greater than the four_ hour category, then improvements must be made by the Licensee NSP 06 3

t until'the plant is within the four hour coping duration category. The addition of two safeguards diesel generators is the -action Prairie Island will take to move from an eight hour to a four hour coping category. When installation of the new diesel generators is complete, Unit 1 can provide an alternate power source for Unit 2 (and vice versa) under blackout conditions.

A Study of the Station Blackout Issue and Addition of Safeguards Diesel Generators, issued in September'1987 reviewed the safeguards Electrical, Auxiliary Feedwater and' Reactor Coolant Pump seal injection systems plus the proposed SBO rule. It described modifications to comply with the rule and addressed issues with those systems.

-It also identified-issues for additional study.

1.4 SBO/ESU PROGRAM OBJECTIVE- AND GOALS The primary objective of the Station Blackout / Electrical

. Safeguards Upgrade (SBO/ESU) Program for Prairie Island is to implement those plant modifications and software elements (procedures, reporting mechanisms and analyses) that.will.be necessary to comply with the final NRC rule on Station Blackout and remove the regulatory uncertainty and negative availability factor associated with the

' unit's. . sharing of . safeguards diesel generators.

Implementation will be consistent with the industry position as represented in the NUMARC Initiatives end the

. Guidelines' published in NUMARC 87-00.

1) .The short term goals for SBO included:

.o. Respond to the SBO Rule using the NUMARC 8.7-00 format, within 270 days of July 21, 1988 - Complete.-

o ' Upgrade the transmission grid and = offsite power restoration procedures.-~ Complete.

o Provide interim procedures.to provide alternate'AC '

using the D3 and.D4 generators - Complete.

o Revise the Emergency Operating Procedures to address coping with SBO with the present plant equipment -

Complete.

2)- The long. term goals for SBO are:

o Achieve a four hour coping duration per NUMARC 00 by adding two new diesel generators.

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o Achieve alternate AC availability within 10 minutes 1 or if not possible, one hour, by utilizing the '

safeguard diesel generators as alternate AC power for the other unit.

o Update the coping analysis to reflect the actual design for the new diesel generators.

Additional benefits of the SBO Program include: i

1) Install additional safeguards diesel generators, to:

c o Reduce the regulatory uncertainty associated with

-sharing emergency diesel generators between units.

o Reduce the loss of onsite AC power contribution to  ?

core melt risk.

o Eliminate the two unit shutdown exposure caused by l- the present diesel generator Limiting Condition for '

. Operation (LCO).

o- Provide: increased emergency on-site power margin as well~as margin for future loads.

2) Provide ^ for powering of 121 Cooling Water Pump to reduce two unit shutdown exposure caused by the s Cooling Water' System LCO. "i

-3) Provide integrated planning, design and installation for diesel generator-plant interface.

l '. 5 - RESPONSE TO'THE NRC RULE ON STATION BLACKOUT -

The formal report required by the NRC SBO Rule was submitted to the Commission on April 13, 1989.-- This response was formatted in accordance with. guidance from

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L NUMARC and addressed completed and future activities-

' required to meet the NUMARC Initiatives.

, 'For' Prairie Island, the response _ included:

i o Description of the coping category .and coping~

duration.

o Description of completed and planned procedure revisions.

L o The-schedule-for the addition of.DS and D6.

o- Description of the alternate AC concept. In response to the NRC Rule on Station Blackout,.an alternate '

source of AC power for the essential (safeguard) electrical equipment buses will be provided.

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'The addition of the alternate AC source of power will be

- accomplished by the following SBo Program plant modifications:

1. D5/D6 Diesel Generator Addition ,

. Two new diesel generators, D5 and D6, will be added to the Prairie Island Plant. These generators will serve  !

e as a dedicated source of emergency power for Unit 2 and as an alternate AC- source of power for Unit 1. The existing D1 and D2 diesel generators will serve as dedicated emergency AC power ' for Unit 1 and as an ,

alternate AC source of power for Unit 2. The new diesel 1 generators - will be sized to provide adequate onsite ~

emergency power to Unit 2. Additional capacity will be '

provided for 121 Cooling Water Pump and possible future loads. P

.2. New Diesel Generator Buildina A new Class I building will be constructed to house D5 and DG diesel generators, support equipment, and- new switchgear for Unit 2. j

3. Plant Interface Electrical, . instrument and control equipment will be installed to permit the use of DS and D6 as onsite i emergency sources for Unit 2 and as alternate AC-for Unit 1. T h e -- e x i s t i n g electrical power and control systems for. D1 and D2 will be modified -to facilitate i their use as onsite emergency sources for Unit 1-and as '

alternate.AC for Unit 2.

-The control design. will minimize the impact of the additional equipment m plant- operations. staffing

, requirements for an App adix..R safe shutdown condition

.by centralizing local controls for diesel generator and switchgear operation. The electrical and controls design will' permit the implementation of alternate AC within 10' minutes.. Main' control room instrumentation and' controls 1 will- be human engineered to . allowed efficient control- '

room operation,of the diesel generators and safeguards el'ctrical systems.

Additional switchgear will be provided to allow powering of 121 Cooling Water Pump from either Unit 2. safeguard 4kV bus. Additional switchgear cubicles will be provided  ;

for future loads.

Plant computer monitoring of the new diesel generators and related electrical systems will be provided.

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To the fullest extent possible, construction sequencing will be planned to allow installation during unit operation, with minimal disruption of plant activities.

Critical instal)stion interf aces will be planned to occur during unit outages.

4. 121 Coolina Water Pumn Ucarade --

As pait of the SBO project, a new 4kV switchgear power feed will be provided for 121 Cooling W;ter Pamp. This -

pump is common to both units. The pump motor "ill be upgraded to Class 1E. The new switchgear will be ,

designed to be fed from either D5 or D6 diesel generators. This upgrade will increase the availability 1 of the Cooling Water System and provide the bacis to request a Technical Specification change to a Limiting Conditien for Operation which presently requires shutdown i of both units in the event of extended inoperability of one of the safeguards diesel-driven cooling water pumps. .

5. lipin Control Board Modification Space will be provided on the Main Control Room panels i for D5 and D6 instrumentation and controls and for additional switchgear controls. An evaluation was performed to determine the information and control capability required to operate the diesels and safeguards buses, and to determine the prudence of modifying G Panel -

versus providing space on each unit's F Panel. The evaluation considered cost single and two unit outage time, safe operations, construction complexity and operating philosophy for the two basic options.

The option chosen was to replace G Panel. The work will be performed as part of the Plant Interface discussed above. This will involve placing all required instrumentation and controls on a new "G" Panel. E

6. Simulator Modification 4 The plant control room simulator will be modified to reflect the addition of the D and D6 diesel generators.

This modification will include changing the simulator software and the simulator control board to include the new diesel generator and electrical switchgear control functions. The Emergency Response Computer System Simulator (ERCSS) software will also be modified to emulate the EHCS in the plant. ,

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1.6 ELECTRICAL SAFEGUARDS UPGRADE In conjunction with the SB0 Program modifications listed in Section 1.5, an upgrade of the electrical safeguards 4kV e.nd 4t9V distributions systems will also be provided.

The 5.'.lectrical Safeguards Upgrado (ESil) Program will perh _a the following modificat ans:

o Replacement of 4kV safeguards buses in Unit 2 and expansion of Unit 1.

o Replacement of 480V safeguard buses in Units 1 and 2.

o Provide additional 480V safeguard buses and 4kV l switchgear capacity for future loads, Units 1 and 2.

o Provide 480 safeguard bus alternate feeds in Unit i 1 and 2.

o Improve voltage regulation, principally r4t the 480V level, in Units 1 and 2.

o Improve circuit coordination by eliminating subfed  ;

480V Motor Control Centers (MCCs) on safe'juards i buses.

1.7 DEFINITIO!1S l

Alternate AC (AAC) Source: )

i An A lt ernating current (AC) power source that is availaule to and located at or nearby a nuclear power plant and meets the following requirements; 1) is connectable to but not normally connected to the offsite or onsite emergency AC power system; 2) has minimum 1

j potential for common mode failure with offsite power or t the onsite emergency AC power sources; 3) is available in a timely manner after the onset of station blackout; i and;

4) has sufficient capacity and reliability for operation of all systems required for coping with Station Blackout (SBO) and' for the. time required to bring and l maintain the plant in safe shutdown (non-design basis 1-accident).

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A piece of equipment required to perform a specific function within a system.

Class 1Et Label applied to all electrical equipment that has been 1 seismically and environmentally qualified to support all required safety related equipment and safety system functions.

Non-Class 1Et Label applied to all electrical equipment qualified to support all non-safety related equipment and non-safety rystem functions.

Desian Basest ,

Information which identifies the specific functions to be performed by a structure, system, and component of a facility, and the specific values or ranges of values chosen for controlling parameters as reference bounds for design.

Enaineered Safeauards Features (Safeauardsit Provisions in the plant which implement methods to retain fission products by the containment for operational and accidental releases beyond the reactor toolant boundary and limit fission product releases to minimize population exposure, prevent occurrence, or to minimize the effects of serious accidents.

Fire Protection Relatedt Plant fire protection features including those which prevent- fires from starting, detect, control or extinguish fires or otherwise provided fire protection for structures, systems and components in accordance with 10 CFR 50 Appendix R commitments, Safety Evaluation Reports, Technical Specifications, and other documented commitments to the NRC concerning fire protection.

Functional ComDonent i

A component in which movement must occur automatically, with or without operator action at the device location, to accomplish the nuclear safety function of the component.

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n operatina Basis Earthauake (OBE):

That earthquake which, considering the regional and local geology and seismology and specific characteristics of local subsurface material, could reasonably be expected to affect the plant site during the operating life of the plant, and produce the vibratory ground motion for which those features of the nuclear power plant necessary for contir.ued operation without undue risk to the health and ,

safety of the public are designed to remain functional.

Safety Related Itemg.1 Any structure, system or component that prevents or mitigates the consequences of postulated nuclear l accidents that could cause undue risk to the health and  ;

safety of the public.

Safety Related Structures: .

Safety related structures are those structures whose failure might cause or increaseu the severity of a loss-of-coolant accident or result in an uncontrolled release of radioactivity which would produce radiation levels at the site boundary in excess of 1% of 10 CFR 100 limits, and those structures vital to safe shutdown and isolation of the reactor. Safety related structures include those structures that are foundations or supports for or that protect those systems and components classified as safety related, r

Non-Safety Related Structures: '

P Non-safety related structures are those structures which may or may not be important to normal reactor operation

• but are not essential to safe shutdown and isolation of the reactor and whose failure could not result in the t release of radioactivity in excess of 1% of 10 CFR 100 limits.

i' Safety Systems:

Any systems or portions of systems wh3,h are necessary to remove heat directly from the reactor containment, circulate reactor coolant for any safety system purpose, control radioactivity released within the reactor containment, or control hydrogen in the reactor containment.

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Safe Shutdown Earthauake (SSE):

An earthquake which is based upon an evaluation of the maximum earthquake potential considaring the regional and local geology and seismology and specific characteristics of local subsurface materia 1.. it is that earthquake which produces the maximum vibratory ground motion for which certain structures, systems, and components are designed to remain functional necessary to assure the integrity of the reactor coolant boundary, the capability I to shutdown the reactor and maintain it in safe shutdown condition, and the capability to prevent or mitigate the consequences and accidents which could result in potential offsite exposures. The SSE defines that .

earthquake which has commonly been referred to as the '

Design Basis Earthquake.

Safe Shutdown (Non-Desian Basis Accident (Non-DBA)):

In reference to Station Blackout (SBO), the non-DBA means bringing the plant to either Hot Standby or Hot Shutdown, sirice plants have the option of maintaining the RCS at ntrmal operating or reduced temperatures.

Seismic Cateaory I A structure, system, or component designed to withstand the effects of a Safe Shutdown Earthquake (SSE) and 1 remain functional because they are needed to assure the l integrity of the reactor coolant pressure boundary, the-capability to shutdown and maintain the reactor in a safe shutdown condition, the capability to prevent or mitigate the consequences of accidents which could result in potential offsite exposure comparable to 1% of the 10 CFR 100 guidelines. This category has two subsets as follows:

Seismic ~ Active components which must remain operable during and or after an SSE in order to perform their safety function.

Seismic-Passive l Components-which must maintain structural integrity l

during or after . an SSE in order to perform their safety function.

Hgn-Seismic:

l Components that have no st(smic requirements, wsp.D6 11

i seismic II over it i All non-safety-related systems and components and their supporting systems are designed to ensure that the SSE does not cause their structural failure in a manner that will result in damage to safety-related systems or ,

components.

Sinale Failure:

An occurrence which results in the loss of capability of a component to perform its intended safety functions.

Multiple failures resulting from a single occurrences are considered to be a single failure.

Station Blackout (SBO):

The complete loss of alternating current (AC) electric power to the essential and non-essential switch iear buses in a nuclear power plant.

Structure:

The physical shield, foundation, or building which encloses, protects, and/or supports any plant system or component, or protects plant operators. ,

System:

A group of interdependent components required to perform a specific function.

1.8 REFERENCES

" Study of Station Blackout Issue and Addition of Safeguard Diesel Generators", Northern States Power / Fluor, R/E 86Y730, September 1987.

Prairie Island' Updated Safety Analysis Report (USAR), '

Sections 1.0, 8.0, 10.0 and 14.2.

10 CFR 50.63, Station Blackout Rule.

NUMARC-8700 " Guidelines and Technical Bases for NUMARC In' 'iatives Addressing Station Blackout at Light Water Reo tors",

" Loss of all Alternating Current Power Information Required by 10 CFR 50, Section 50.63 (c) (1)", NSP letter of April 13, 1989 to NRC.

" Project for Addition of Two' Emergency Diesel Generators", NSP letter of September 29, 1989 to NRC.

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6 2.0 OVERVIEW: EXISTING DESIGN AND UPGRADED DESXEl{

2.1 EXISTING SAFEGUARDS AUXILIARY p0WER SYST Q The existing Prairie Island Units 1 and 2 diesel generators, D1 and D2, and saf0 guards electrical distribution system provide for emergency power in the event of loss of offsite power in order to bring both units to a safe (hot) shutdown condition. This is '

achieved using automatic control logic and operator actions. Each diesel generator, as a backup to the preferred offsite A-C power supply, is capable of

'l" sequentially starting and supplying the power requirements of one complete set of engineered safety y features for one unit whale providing power to allow the 1

', second unit to be placed in a safe shutdown condition. '

See Figure 2-1 for the existing one-line electrical  !

diagram of the Emergency AC Power System.

Diesel generators D1 and D2 consist of two Fairbanks Morse units each rated at 2750kW continuous (8750 hr. i basis), 0.8 power factor, 900 rpm., 4160-volt, 3-phase, i 60 Hertz. The 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating of each diesel generator is 3000 kilowatts and the 30 minute rating is 3250 kilowatts maximum. This figure is based on cooling water at a maximum temperature of 95'F and ambient air at a l temperature of 90*F. The limitations imposed by the ,

generator and the heat removal equipment limits the  ;

overall 30 minute rating of the system to 3250 kilowatts.

The worse case plant loads placed on an emergency diesel generator during a design basis accident (requiring safety injection on one unit and hot shutdown on the other -in conjunction with loss of power to both Units plus a failure of one EDG) result in approximately 2825kW fcr the automatically and manually connected loads within the first hour and then decreasing to less than 2000kW ,

for the duration of the accident. Table 2-A depicts the presently evaluated D1 and D2 loads for the above scenario (see attachment).

Each diesel engine is automatically started by compressed air stored at a pressure of approximately 250 psi. Two parallel solenoid admission. valves deliver air simultaneously to a timed pilot air-distributor valve and an individual air-start valve located in each of the twelve cylinders. Starting air is thus admitted directly into the cylinders for fast, reliable cranking and starting. Adequate cranking effort is obtained with only six air valves. The additional six valves give increased starting reliability.

NSP D6. 14

i Each diesel generator has its own independent air i starting system including motor-driven air compressors, (powered from a 480-volt safeguards bus) and receiving tanks, each of sufficient capacity to crank the engine for 20 seconds.

To enhance rapid start-up, each diesel unit is equipped with two temperature-controlled immersion heaters which furnish heat to the engine cooling water and the engine lubricating oil when the engine is shutdown. Two motor-driven circulating pumps, for cooling water and lube oil, operate continuously when the engine is shutdown.

Automatic starting of each diesel generator (D1 and D2) is initiated by an under-voltage relay scheme (either of 2 sets of 1 plus 1-out-of-2) on the 4160-volt bus to which the diesel generator is connected. Automatic starting is also initiated by a Safety Injection (SI)  ;

signal, j 1

Sufficient fuel is stored in the day tank for each diesel  ;

generator for a minimum of one hour operation at full load. Fuel from interconnected storage tanks is i transferred to the day tanks by electric pumps for  ;

operation of each diesel for a minimum of one week.

2.2 UPGRADED SAFEGUARDS AUXILIARY POWER SYSTEM The upgraded safeguards auxiliary power system includes the construction and installation of two new diesel generators, DS and D6, with all support systems. The support systems include fuel oil, starting air, ,

ventilation, cooling water, diesel oil storage tanks ,

located in a vault, and transfer pumps located in the 05/D6 building, 4160V and 480V switchgear buses, 480V Motor control Centers (MCC),125V DC distribution panels, load sequencers, lighting distribution panels, transformers, cabling and numerous components necessary for modifying the existing equipment. See Figure 2-2 for an upgraded one-line electrical diagram of the emergency AC power system.

2.2.1 D5 and D6 Diesel Cenerators and Suncort Systems i

The new diesel generators will consist of t tandem-drive units manufactured by Societe Alsac ..ine de Constructions Mecaniques de Mulhouse (SACM), located in Mulhouse, France. Each diesel generator consists of one generator driven by two diesel engines, with one mounted on each end of the generator in a back-to-back arrangement. Each diesel generator is rated at 5400 kW continuous (8750 hr. basis), 0.8 power factor, 1200 rpm, 4160-volt, 3-phase, 60 Hertz.

nP D6 15

The new dies >l generators are radiator cooled and will be independent of the existing plant cooling water system.

The new D5/06 Building houses two SACM diesel generators (D5/D6) , with associated control panels, auxiliary equipment, electrical distribution equipment, fuel oil day tanks and lube oil tanks, and the diesel engine radiators.

The Fuel Oil Storage and Transfer System for each diesel generator consists of two storage tanks 10ounted in a concrete vault located adjacent to the DS/D6 Building plus.two transfer pumps located in the diesel room pit ,

area of the D5/06 Building. A shared, above grade, receiving tank is also provided. Diesel engine fuel oil transported to the site will be off-loaded initially to the receiving tank. The fuel oil in the receiving tank will be tested to ensure compliance with the diesel engine fuel oil specifications. After compliance is verified, the fuel oil in the receiving tank can be pumped to the diesel engine fuel oil storage tanks.

2.2.2 Safeauards Electrical System As part of the SBO/ESU Program, existing diesel generator D1, presently supplying power to the Train A Safeguards system of both Units, will be reassigned to the Unit 1 Train A Safeguards emergency power system. Similarly, existing diesel generator D2 will be reassigned to supply power-to the Unit 1 Train B Safeguard emergency power system. Thus, the two existing diesel generators will be aligned as the emergency'AC power supplies for Unit 1 and certain conunon or shared systems.

3 The two new diesel generators ~will be aligned as the emergency AC power supplies for Unit 2 and certain common ,

or shared systems. D5 will supply power to Unit 2 Train A Safeguards power system and D6 will supply the Unit 2 Train B Safeguards power system.

The two existing Unit 2 load sequencers will be replaced with two new qualified solid-state programmable logic controller-based sequencers.

In addition to installing D5 and D6 diesel generators, the safeguards electrical distribution system will be upgraded.

New Unit 2 4160V safeguards switchgear will be located I

in the new Class I D5/D6 Building. This will be accomplished using two new 4160V switchgear lineups.

The present Unit 2 4160V safeguard loads will be reconnected to the new Unit 2 safeguards switchgear, wsp46 16 1

A new 4160V safeguards switchgear lineup (Bus 27) will be installed in the DS/D6 Building and the switchgear i will be selectively energized from Unit 2 4160V switchgear train A or B. This lineup will be the l safeguards power source for 121 Cooling Water Pump.

Portions of the present Unit 2 4160V safeguards switchgear will be added to Unit 1 safeguards switchgear. ,

The cooling tower source transformers and the R source transformers will be connected to each of the four ,

safeguards 4160V switchgear line-ups. This configuration will provide 2 independent (see section 3.2) offsite sources to each 4160V safeguards bus and will minimize the use of 4160V bus ties between unito.

Four new Unit 2 480V safeguard buses (two per train) will be installed in the new DS/D6 Building to replace the two existing buses. The present Unit 2 safeguards loads i (MCCs) plus additional DS, D6 and building safeguards loads will be divided between the buses of a ghen train to improve the voltage regulation on the 480V r '

Nards buses.

The two existing Unit 1 480V safeguards a will be replaced with four new safeguard buses. Or f the buses l will occupy the vacated Unit 2 480V switch; et room. The second bus will occupy the existing Nit 1 480V switchgear room. The two additional buses will be located in the present Unit 2 4160V switchgear rooms.

The resulting Unit 1 configuration, two buses per train, ,

will be similar to Unit 2. The present Unit 1 safeguard MCC loads will also be divided between the buses.

Subject to equipment availability, automatic voltage regulators will be added to each of the Unit 1 and Unit 2 480V safeguards buses (8 total) to improve voltage regulation.

Alternate power sources from the. same train of the opposite unit, to be used primarily during maintenance outages on 4160V source buses will be added to the 480V safeguards buses. Each alternate source line-up will consist of an incoming line compartment, a 4160-480V transformer section and a transition section for connection to the 480V switchgear by bus duct or cable.

One alternate source line-up per train will'be provided to be used . by either or both 480V safeguards buses.

Loading on the alternate source transformer will be administratively controlled within ratings.

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R O U N

E 3.0 DIESEL GENERATOR AND AUXILIARY SYSTEMS- DESIGN AND I INSTALLATION Two identical diesel generator sets, DS and D6, will be installed on a concrete foundation, complete with all accessory components, connecting piping, wiring, and )

instrument tubing. D5 and D6 will be located in separate rooms of a reinforced concrete Seismic Category I structure. Each diesel generator system will be monitored to alert personnel of abnormal conditions.  ;

Annunciator alarm systems will be located in the main control room and on local control panels in the DS/D6 l Building.

The D5 and D6 units will be composed of tandem-engine  ;

diesel generators manufactured by Societe Alsacienne de Constructions Mecaniques de Mulhouse (SACM) . The diesel engines are Model No. UD45-V16-S-D-5, 16 cylinder, and have a closed cooling system using radiators. The generator manufacturer, subcontractor to SACM, will be Jeumont-Schneider, also of France.

The equipment will be specified, designed and manufactured to operate over a design life of 40 years with specified servicing. The diesel engine will be of vertical V-frame, stationary type, turbocharged, multi-cylinder, and complies with the manufacturer's qualified  ;

design for emergency standby operation required for nuclear power plant service. The operating rated speed

'All be 1,200 rpm.

The two engines in each set will be directly coupled to a dual bearing generator, one on each end in a back-to-back arrangement. The generator and exciter will-have a continuous rating of 5,400 kw gross, and a voltage rating of 4.16 kV at a frequency of 60 Hz. Each diesel generator will be capable of attaining rated frequency.

and voltage within 10 seconds after receipt of the starting signal. During the loading sequence steps, frequency and voltage will be maintained above minimum values of 95 percent and 75 percent, 'respectively.

During recovery from transients caused by step load increases, or resulting from-the disconnection of its largest single load, the speed of'the diesel. generator '

set will not exceed nominal speed plus 75 percent of difference between nominal speed-and the overspeed trip setpoint. Each generator will be designed for isolated and parallel operation.- The units will be free from harmful critical speeds within the normal operating range, up to and including automatic trip shutdown speed at 115 percent of rated operating speed.

NSP D6 18

L The two engines are identical except for the camshaft drive trains which provide clockwise rotation for one engine and counter clockwise for the other as required by the back-to-back arrangement. Each diesel delivers equal power to the generator as a result of the governor control. Acceleration, speed, and load will be controlled by means of the governors which meter the flow of fuel into the combustion chambers.

3.1 SEISMIC DESIGN CLASSIFICATION The seismic design classifications for the diesel generator and auxiliary systems are as follows:

The D5/D6 Building Seismic Response Spectra will be used for Seismic design and qualification of systems and components classified as Seismic Category I.

3.1.1 Diesel Encine Auxiliary Systems )

All components of the diesel engine auxiliary systems that are required to operate during a design basis accident or to mitigate consequences due to an accident will be designated as Seismic Category I and are designed and constructed to withstand safe shutdown earthquake ,

(SSE). All other components which are not required for j safe shutdown will be seismic II over I supported to i preclude damage to safety related systems or components.

3.1.2 Diesel Generator Room Ventilation Systems  !

All components of the_ diesel generator room ventilation ,

systems will be Seismic Category I, except the normal i supply fan which will be mounted Seismic II over I.

3.1.3 Electrical Power Distribution. Instrumentation and Controls The electrical power distribution system will be designed and installed as Seismic Category I per RG 1.29, and Seismic qualification will be per IEEE 344 and Regulatory '

Guide 1.100. This safety-related system is required to a be operable both during and after the occurrence of a design basis event.

Instruments, controls and associated sensing lines required for the operation of the diesel engine auxiliaries and engine room ventilation system will be Seismic Category I. Those that are required for alarming indication and monitoring will be designed for seismic mounting only (Seismic II over I) when necessary to preclude damage to safety related systems or components.

WSP 06 19 1

l

h 3.1.4 Fuel Oil Storace and Transfer System The fuel oil storage tanks, concrete structures, transfer pumps, piping and electrical equipment will be S.'smic Category I. _ The receiving tank, recirculatin ump, associated piping, and piping components wili ,

non-safety related, but will be designed to withai .nd SSE loads without failure (Seismic II over I). The storage tank level instrumentation for indication and alarm will not be safety related and will be seismically mounted only to preclude damage to safety related equipment

• (Seismic II over I). The control switches to initiate j

operation of the transfer pumps (also day tank level switches) will be seismic Category I.

All electrical equipment and raceways will be designed and installed as Seismic Category I.

All sensing lines for tank level and transfer pump instrumentation will be seismically supported and must maintain integrity of the pressure boundary (Seismic Category I).

3.2 SAFETY DESIGN CLASSIFICATION The safety design classifications for the diesel generator and auxiliary systems are as follows:

3.2.1 Diesel Encine Auxiliary Systemg All interconnecting piping between equipment that is necessary for the operation of the diesel generator will be safety related. All other piping and its components that are not necessary for diese3 generator operability, such as drain, vent, and fill linos will be non-safety related.

The design classification for piping and equipment in each diesel engine auxiliary systems is as follows:

1. Cooling Water System Safety Classification (both HT: High Temperature cooling Circuit and LT: Low Temperature Cooling Circuits)

a.

• Radiator Safety Related

b.

• Expansion Tank Safety Related

c. Reservoir / Storage Non-Safety Related Tank and Piping NSP D6 20 i

- - - ~ _ _ . . .

1

d. AC Motor Operated Non-Safety Related Transfer Pump

e. Interconnecting Safety Related Piping (Including Equipment Vent Lines)

f. Exp. Tank Fill, Non-Safety Related ^

Overflow, Vent, beyond first isolation and  :

Drain Lines valve. j 1

2. Fuel Oil System

a. Day Tank Safety Related

b. Dirty Oil Tank Non-Safety Related

c. Interconnecting Safety Related Piping

?

3. Starting Air System

a.

• Compressor Unit Non-Safety Related W b.

• Air Dryer Non-Safety Related

c.

• Air Receiver Safety Related

d. Interconnecting Piping

1) Receiver to Safety Related Engine

• 2) Compresscr to Non-Safety Related Dryer

3) Dryer to Non-Safety Related Receiver

e. Vent & Drain Lines Non-Safety Related beyond first isolation valve for air receiver. ,

4. Lube Oil System

a. Lube Oil Storage Tank Non-Safety Related ,

b.

• Lube Oil Cooler Safety Related

c. AC Motor Driven Non-Safety Related '

Transfer Pump

d. Tank Vent & Non-Safety Related Drain Lines

e. Engine / Aux. Desk Safety Related Interconnecting Piping

f. Lube Oil Tank Non-Safety Related Fill Line wsP 06 21

l l

S. Combustion Air and Exhaust System l

a.

• Intake Air Filter Safety Related j

b.

• Exhaust Silencer Safety Related l

c. Interconnecting Safety Related I Piping i

• Supplied under Diesel Generator Specification M-870. ]

3.2.2 Diesel Generator Room Ventilation System The diesel generator room normal mode ventilation fans and associated ductwork and controls, will be non-safety related.

All other components of the diesel generator room ventilation system will be safety related.  ;

3.2.3 Electrical Power Distribution. Instrumentation and controls The electrical power distribution and controls system necessary for operation of safety related equipment is  !

classified ao safety related (Class lE). Djesel generator power is. required in the event of a loss of offsite power, and is required to be available when a safety injection (SI) actuation signal is initiated.

Instruments, controls, and associated sensing lines having the function to ensure operation of the diesel generator units, the engine room ventilation, or to maintain integrity of Class 1E circuits, will be designed safety related. Those that are required for alarming, ,

indication and monitoring will be non-safety related.

3.2.4 Fuel Oil Storace and Transfer System The electrical power supply equipment, including pump controls, instrumentation and cable / raceway will be safety related Class 1E for the equipment associated with ,

the four-storage tanks and four transfer pumps. Controls and instrumentation associated with level and leak detection of fuel oil for the purpose of indication, monitoring and alarm will be designated as non-safety related. Power supply equipment, controls, i

, instrumentation and circuits / raceway associated with the

! receiving tank and recirculating pump will be designated as non-safety related, b

l, 22 W$P.06

The fuel oil storage tanks and associated transfer pumps, piping, concrete structures and supports, will be safety related. The fuel oil receiving tank, rocirculating pump and associated piping are not part of the safety related storage tank pressure boundary, therefore, will be designated as non-safety related.

The design classification for piping and equipment for the fuel oil storage system are summarized as follows: .

Safety Classification

1. Tanks

a. Emergency Storage Tanks Safety Related

b. Receiving Tank Non-Safety Related

2. Pumps

a. Transfer Pumps Safety Related

b. Recirculating Pump Non-Safety Related

3. Piping and components

a. Fuel Oil Transfer Piping Safety Related System (except vent and drain lines)

b. Receiving Tank Non-Safety Related Recirculating Piping

. System

c. Storage Tank Vent Lines Safety Related

d. Storage Tank Drain Lines Non-Safety Related ,

After First Isolation Valve

e. Fuel Oil System Emergency Safety Related Fill Connections

4. Instrumentation a .- Fuel Oil Day Tank Level Safety Related Switches and Standpipe

b. All Other Instrumentation Non-Safety Related

c. Instrumentation Lines after Non-Safety Related First Isolation Valve Nse 06 23

3.3 SYSTEM DESIGN AND INSTALLATION 3.3.1 Diesel Encine Coolina System 3.3.1.1 Diesel Engine Cooling System Design Each engine will be provided with two independent closed loop cooling systems consisting of high temperature (HT) circuit und low temperature (LT) circuit. The HT circuit cools the engine jacket, cylinder block, and the turbocharger. The LT circuit cools the aftercooler and the lube oil heat exchanger. Both HT and LT circuits will.be provided with an engine driven circulating pump, expansion tank, water-to-air heat exchanger (radiator),

.and a three-way thermostatic valve. .

In addition, the HT circuit will be provided with a preheating circuit.to facilitate quick startup of the diesel engine. The preheating circuit will consist of an AC motor-driven standby circulating pump, an electric water heater, and a lube oil standby heat exchanger. The heater and pump are electrically interlocked so that the heater will be energized only when the pump is running.

The preheating circuit equipment are located in the '

engine auxiliaries desk (skid) located adjacent to each engine.

In the standby mode when the engine is not running, the standby motor-driven circulating pump will be running to circulate warm water through the engine jacket. Jacket -

water temperature is maintained at a " keep warm" r temperature by controlling power to the electric heater-with a temperature switch. The warm temperature is transferred to the lube oil system through the preheating lube oil heat exchanger of the HT circuit. During normal

( engine operation, the coolant temperature for either HT L or LT circuit will be maintained at design temperature by the 3-way thermostatic valve action to either direct flow to or bypass the radiator.

The purpose of the HT or LT cooling system expansion '

tanks located on the third floor of the D5/D6 Building, will be to maintain the required pump NPSH on the system circulating pump. The cooling system flow to the pump will be pressurized thus protecting the pumps from cavitation. The cooling expansion tanks will be i adequately sized to provide for thermal expansion of the L cooling water, minor system leaks at the pump shaft s er.l s , valve stems, and other associated components. l Each 50-gallon expansion tank per diesel engine will provide an air vent for the venting of the cooling water system to remove air pockets which otherwise will be 1

WSP*D6 24 l

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entrained in the system creating poor heat transfer conditions in the radiator. '

The closed cycle cooling system will utilize high quality makeup water from the existing plant demineraliced water e system. This is necessary to prevent formation of scale and to maintain a uniform heat transfer rate in the engine jackets. The cooling water will be treated with ethylene glycol mixed to a ratio of GO-50% by weight and a rust inhibiter. .

3.3.1.2 Diesel Engine Cooling System Installation The installation requirement for the engine high temperature (HT) and low temperature (LT) cooling circuits will include providing interconnecting piping between the engine outlet nozzle and the radiator, and i from the radiator discharge to the engine driven pump inlet-connection. A 3-way thermostatic valve will be installed in the piping between the tngine and the radiator and its bypass connection wil3 be connected to the piping between the radiator alid the pump inlet connection. The function of tH s v,alve will be to bypass the radiator to enhance quick engine heatup; therefore, i the valve will be located as close to the engine as possible.

1 Interconnecting piping will be provided to install the HT preheating circuit in parallel with the engine driven -

pump. The standby circulating pump of the preheater circuit will be in operation when the engine pump is not running.

All vent connections from the engine cooling water piping, the electric water heater, and the radiator will ,

be routed to the expansion tank.

A reservoir / storage tank will be provided for each diesel 3 generator set to collect overflow from the expansion tank and to provide refilling water to the cooling water ,

system. A fill' lirie will be provided so that treated water can be-added to the storage tank for replacing any -

system losses. A manual Ac electric pump will be provided to assist in transferring water from the reservoir / storage tank to Lie expansion tank. The minimum capacity of tha :.eservoir/ storage tank will be sufficient to alle' the batch mixing of one 55-gallon drum of glycol and an equivalent volume of water. i l

Figures 3-1 through 3-4 depict the HT & LT cooling Water I Systems for D5 and D6 diesel generators. l l

l WSP D6 25 l l

l 3.3.2 Diesel Puel Oil System 3.3.2.1 Diesel Fuel Oil System Design Each engine fuel oil system will consist of a 100%

capacity engine-driven booster pump, a 100% capacity backup booster AC motor-driven pump, a duplex-type filter and a common day tank. Any excess fuel oil from both pumps is returned to the day tank by the excess flow valve located upstream of the duplex strainer. Each of the 16 cylinders will be fed from a dedicated injection pump and nozzle via the double wall injection piping. 1 Any fuel oil leakage from the inner wall piping will be contained within the outer wall where it drains into the accidental leakage manifold and finally drain to the i leakage tank. The leakage' tank is monitored by a high level alarm that indicates excessive leakages. Discharge from the' leakage tank flows by gravity to a common dirty i oil tank. l One day tank will be provided for each diesel generator set. The capacity of the day tank will be determined from the fuel consumption rate of both engines, running l continuously for a period of at least 60 minutes without makeup. The fuel consumption rate will be based at 100%

' rated load plus a margin of 10%. The day tank will be located inside the D5/06 building at an elevation that will ensure adequate net positive suction head to the booster pumps.

3.3.2.2 Diesel Fuel Oil System Installation The installation requirements for the fuel oil system will. include providing interconnecting piping for the following:

l

a. From the day tank to the engine oil pump inlet connection.

b. From the engine oil pump outlet to the auxiliaries desk.

c. From the auxiliaries desk discharge connection to ,

the engine oil feed inlet connection.

d. From the day tank to the backup booster pump inlet located in the auxiliaries desk.

Miscellaneous engine connections. such as the engine oil overflow line and the auxiliaries desk safety valve l connections will be routed back to the day tank.

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Each day tank will be equipped with a drain and overflow connections that are tied together and routed back to the storage tanks. A missile-protected vent line will be provided and vented to atmosphere. A flame arrestor will be installed in the vent line.

One dirty oil tank will be provided for each diesel generator set for storing leakage from the fuel oil system. A drain line with manual operated valve will be provided to empty the tank periodically into a portable container. The tank will be equipped with overflow line that is routed to the building sump. A gauge site glass for level indication will be provided.

Level switches will be provided for each day tank to automatically refill the tank by actuating the oil transfer pump on low tank level.

Figure 3-5 depicts the fuel oil system for the D5 and D6 diesel generators. Figures 3-6 and 3-7 depict the fuel oil systems for the D5 and D6 diesel generators, respectively.

3.3.3 piesel Air Startina Svstom 3.3.3.1 Diesel Air Starting System Design Each. diesel engine of each diesel generator set will be j provided with two independent and redundant air starting systems that are each connected to both sides of the cylinder block. Each system will consist of two AC motor driven air compressors, .two air dryers and two receivers.

Starting air will be provided simultaneously from all four starting air systems (two per engine) to start the diesel generator set.

l- Each air starting system will be mounted on a separate baseplate. The air compressor together with ' the air dryer will be capable of recharging the air receiver from minimum to normal operating pressures in no more than 20 minutes.

' The air dryer will be of the heatless type containing two towers thet are connected in parallel. Both towers are filled with molecular sieve desiccant product where one tower is alternately in the drying phase while the other tower is- regenerating. The dryer will provide dried starting air at a dew point of -4*F when the system is pressurized.

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1

Each air starting system will have a capacity capable of cranking the diesel generator set for a minimum of five times from cold start without recharging. Normally all four receivers will provide air supply simultaneously to start the diesel generator set; however, only two out of four receivers are necessary to meet the required  ;

acceleration during loading to start within 10 seconds or less.

Provisions will be made to blow down any accumulated moisture in the water separator provided with the compressor unit, and the oil and water separators with the air dryer. The air receiver will be provided with  ;

drain connections to allow periodic manual draining of moisture conte..it during startup and normal operation.  ;

A relief vsive will be provided to protect the air receiver from overpressure.

3.3.3.2 Diesel Air Starting System Installation The installation requi mA3ts for the air starting system will include providing  ;- rconnecting piping for the following

a. From each air receiver outlet connection to the air filter and starting air solenoid located inside the auxiliaries desk.

i

b. From the auxiliaries desk oi.tlet connection to the  !

engine air distributor inlot connection. 1 1

c. From air supply line in the auxiliary desk to engine ' {

overspeed protection system.

Miscellaneous piping will be required to route equipment drains to the floor drain system and to route safety valve discharge connections so that discharges are directed outside of the operating and maintenance areas.

Figures 3-8 and 3-9 depict the starting air systems for the DS and D6 diesel generators, respectively.

3.3.4 Diesel Lube oil System 3.3.4.1 Diesel Lube Oil System Design The engine lube oil system will consist of two cross-tied loops, pressurized by two 50% capacity engine driven

-pumps. The pumps discharge supply oil from the crankcase

~

sump through the lube oil cooler, a duplex-type filter for cleaning, and distribute lube oil to the engine block to lubricate moving parts and to provide piston cooling.

wsp 06 28 i

A 3-way thermostatic valve regulates flow through the oil cooler based on outlet temperature. Any excess oil from the discharge valve and cylinder block internal bearings are' returned to the oil sump. j The lube oil system will be provided with a pre-lube system to maintain constant flow of lubricating oil to critical areas during standby mode to minimize wear during engine ctarts. To enhance c[uick engine starts, the pre-lube system maintains lube otl in the " keep warm" temperature through the lube oil standby heat exchanger, ,

heated by the keepwarm portion of the HT cooling water '

system. The pre-lube system design will include provision for draining lube oil from the engine _

crankcase. An AC motor-driven pump will be t sed normally "

for pre-lube system operation with a DC motor-driven pump for backup operation. Both pumps and the standby heat exchanger will be located in the auxiliaries desk. _

A sufficient quantity of lube eil s to permit 7 days of L continuous operation at rated load will be maintained on site for each diesel generator. The lube oil will be stored in drums or a lube oil storage tank.

The lube oil storage tank provided for each diesel generator will be located at an elevation to pormit filling of each engine crankcase by means of gravity flow, which will be controlled by a manually-operated -

fill valve.

3.3.4.2 Diesel Lube Oil System Installation Installation requirements for the lube oil system will include providing interconnecting piping for the following equipment:

a. From the lube oil storage tank to the manually-operated fill valve.

b. Reservoir fill line (funnel) to the lube oil reservoir.

c. From the engine prelubrication outlet to the auxiliaries desk.

d. From the auxiliaries- desk outlet to engine prelubrication inlet connection.

Miscellaneous piping will be required by the diesel engine. This includes providing crankcase relief valve discharge piping to be routed to the building sump.

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An AC motor driven transfer pump will be provided at the i ground floor elevation to refill the lube oil tanks from portable lube oil container. The control of this motor ]

will be provided by local start and stop push buttons and  ;

locel motor starter.

The lube oil storage tanks will be located inside the D5/D6 Building. Each will be equipped with an outside H vent line and a flame arrestor. A drain line with a manual drain valve will be provided. Each tank will be i furnished with an overflow line so that any overflow will be accumulated in the dike enclosure provided for each s

lube oil tank.

Instrument interconnecting lines for the luba oil system will be routed from the engines to the auxiliaries desk.

These include instruments, such as for oil pressure and oil temperature indicators and switches.

Figures 3-10 and 3-11 depict the lube oil systems for D5 and D6, respectively.

• 3.3.5 Diesel Combustion Air and Exhaust System 3.3.5.1 Diesel Combustion Air and Exhaust System Design Each diesel engine will have independent combustion air intake and exhaust systems. The combustion air system will include an air intake filter that will function in accordance with the engine manufacturer's recommendations. The air intake system will be designed and located no less than 20 feet above grade such that fresh outside air will be provided and dilution with exhaust products will not occur. The air intake system I will be designed to prevent entrained water from entering the engine ~ air intake.

The combustion air inlet piping system has been reviewed -

by the engine manufacturer to assure the engine ability :l to start and run during site ' design basis tornado ,

depressurization conditions. '

'The engine exhaust system will include a manufacturer's

'1 recommended industrial-type exhaust silencer with multi- .

compartment. construction to limit noise level. l 3.3.5.2: Diesel Combustion Air and Exhaust System Installation i l

Installation requirements for the combustion air and i exhaust system of each. engine will include the following l interconnecting piping: l l

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a. From single air intake filter discharge connection to two turbocharger inlet connections,

b. From both turbocharger outlet connections to a single connection provided by the exhaust silencer.

c. From exhaust silencer discharge end to atmospheric discharge.

The combustion air and exhaust piping will be sized so

-that the combined total maximum pressure drop will be within the manufacturer's recommendation. Each of the engine's dual air intake and exhaust legs will be closely _

balanced to minimize differential back pressures from occurring. Similarly,- the total pressure loss consisting of combustion air and exhaust piping for both engines will be closely matched so that both engines will share equal loads.

The exhaust piping will be protected from possible clogging due to rain, snow, or ice, during standby or operation of the-systems. An annular space between the exhaust. pipe and.the pipe sleeve through the roof will prevent build-up of back pressure N;- to sleeve blockage.

An expansion' joint.will be provided in the intake air and-exhaust piping to accommodata piping thermal expansion a n d '. t o . m i n i m i z e transfer of vibration to the piping system.

Thermal insulation will be provided for the exhaust piping including silencer and expansion joints.

Figures . 12 - & '3-13 depicts. -the combustion air and exhaust for D5 and D6,.respectively.

3.3.6- Diesel' Generator Room Ventilation Systems 3.3.6.l' Diesel' Generator Room Ventilation Supply System Design-

a. . Diesel. Generator Room Ventilation Supply Each of'the two diesel generator rooms will have an independent ventilation system which will function

.to limit the maximum ambient temperature to 120*F-p in :'conformance' with equipment ratings, wheu the

Diesel Generators are operating.

The'ventile. tion system will also supply .the minimum required volumetric flow of . air necessary to directly cool the generator bearings and other

' features specified by the Manufacturer.

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.n The diesel generator room ventilation supply fan will force outside air into the room.

1 Provisiens will be n.ade to modulate the outside air with return air. This modulation limits indoor ambient air temperature to 50'F minimum, while-the engine is running.

Each diesel generator room ventilation supply fan will auto start when the corresponding diesel generator starts,

b. Diesel Generator. Room Normal Mode' Ventilation Each of the two diesel generator rooms will have an independent ventilation exhaust system which will function to provide a minimum continuous ventilation requirement of I cfm per square foot of the diesel generator room floor area when diesel generator set.

is not operating,

c. Diesel Generator Room Ventilation Instrumentation and Controls-The engine room ventilation system will be provided 1 with instruments and controls to enable operation of the systems to maintain room temperature within design limits. The controls are -required to function- during and after diesel generator-operation. '

3.3.6.2- Detailed Design

~

All components of the diesel generator room ventilation ,,

systems will be capable of performing their function'.in a 120

• F environ aent. Relative humidity is in-the range of 20%:to 90%.

The' heatino . . ventilation, and air conditior;ing (HV7C)

systems capacities are based on an outdoor ambient temperature range of .6*F and ~20'F. This is the 99%

-occurrence range recommended by'the American Society of i Heating,t Refrigerating, and Air-Conditioning Engineers =,

Inc. _ -( ASHRAE) .

.Five different.. sources'of historical weather data were reviewed . in the: selection..of the outdoor; design temperature. The.two principle sources were ASHRAE and the National Oceanic and' Atmospheric Agency (NOAA).

The justification . in selacting the Summer temperature given above'was based on the following:

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l The outdoor temperature recommendation with 99%

occurrence was given as 92'F. This information vr.s also referenced from the ASHRAE " Weather Data and Design Conditions," Table 1, Page 24.10. 1985 Edition for the city.of Minneapolis.

Ample meteorological evidence indicates that the temperature at the 1% level may vary on the order of 2'F to . 4'F in any 15 year period from the previous 15 year period, and may vary even more in any single year from the previous-year.- Since there were stringent design conditions, the 4'F was added to the referenced temperature. Although extremes may result from 100'F and above for a short time, the system will tolerate this increase without adverse impact.

Although the record maximum on-site ten ocrature was 101.6*F for one hour in the hottest summer recorded of 1988, recordings exceeding 96*F (transients of 97'F or 101. 6'F) are not appropriate to ba used as summer design temperatures due to their short duration. The HVAC f steady state heat load calculations do not take credit

• for passive heat sinks (concrete walls and floors) and

,, . thermal lag. Therefore, the HVAC design conditions'are conservative, and brief tempereture excursions up to 100'F or below -20'F will not adversely affect electrical equipment operability.

, Ventilation air flow quantities for. the diesel generator rooms .will be -based- on heat losses including lights, diesel engine, generator, exhaust piping within the . room, air compressors and ventilation fan motors.

.The diesel generator room venti fan will be automatically F started . by a. run signal' from- its corresponding ' diesel N l generator. When the diesel generator stops, theLsupply-fan will continue to run until the room temperature falls below 100*F as sensed by , a temperature switch in the room. The control switch for the~ supply fan is located on the benchboard control; panel.

Temperature control.in the. Engine Room will' be achieved by modulating .outside air and return . air . dampers to maintain. a minimum temperature of 50*F .in the supply fan-discharge duct. The temperature sensor located in'the fan discharge and associated temperature controller

. provide'a modulating signal to control the outside and return' air dampers.

High engine-room temperature as a result of loss of air flow, fan failure or control component failure will be alarmed in the diesel generator control room.

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The intake and exhaust louver framos and blades will be steel, and will be tornado missile proof. The intake and i exhaust openings will be located at an elevation higher l than-the maximum probable flood level.

-All components of each ventilation system will be protected from-tornado generated missiles.

The diesel' generator room vent fans will be vane axial-o type with direct-drive totally-enclosed-air-over (TEAO)-

motors.

i Fan-developed pressures will be based on the pressure drop through ductwork, concrete plenums and distribution accessories,.

All equipment will be factory inspected and tested in accordance with the applicable' equipment specification.

Erection and inspection of equipment will be in t- accordance with the design drawings and manufacturer's eh recormendetion.  ;

System testing and balancing will be performed and-.

evaluated prior to system turnover. Controls on each-system will be checked, adjusted and tested to ensure the

_ proper? sequence of operations. A final, integrated preoperationali test will be conducted with all equipment and controls infoperation to verify operation, i l 3.3.7 Ploina Recuirements and Materials s

All interconnecting piping unless otherwise noted herein, .

'will be ANSI 150Llb pressure class. All miscellaneous piping-suchLas for drain.and vent will be rated for 150 N( lbs. or. greater. '

All' piping-joints and connections will be.wsided.

1, ,

3 Where

/

i required, . such as.at pump suction, discharge connecti.ons, .

J and flexible connections, flanges will be acceptable.

9 7

~ (' ' All' piping : material -.will be carbon steel except ' the 4 following systems: i Material

M ' a. Starting Air System Stainless Steel u

1 304 or 304L

. ,a

. y- b. Combustion Air and Galvanized Carbon Steel i

c. Exhaust System Carbon Moly, 4 Alloy Steel 6 'usp.06 34

.s

< , -4 . - - - - _ _ _ . . . _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _

All tanks will be designed to atmospheric conditions.

~ Tank material will be carbon steel.

The= day tank discharge nozzle connections will be bottom ,

mounted. It will be extended inside the tank such that the accumulated residual sediment from the tank bottom will not be disturbed and carried into the engine cylinders.

The - day tank and storage tanks associated _with each  ;

diesel generator include provisions for a low-point drain with a trap for removal of accumulated water and sediment.

The lube oil motor-operated transfer pumps will be of the rotary gear. type and of commercial grade. The casing material will be cast iron or carbon steel and will be compatible with the transferred fluid.

Engine-generator set and supporting systems will be designed to provide sufficient space to allow for inspection, maintenance.and testing per ASME SectionlXI.

Maintenance envelope space requirements will' be- in accordance with vendor's recommendations. 4 3.3.8 Mechanical Desian'and Fabrication Codes The design, fabrication arid installation code for piping-_

and equipment in each diesel engine auxiliary systems are

'as:follows:

.3.3.8.1  : Pipe / pipe Support Installation Code ,

ASME Section III (1986) Class 3 with the following (

exceptions:

-(1) No:N-Stamp is required._ q (2) Maintenance of a current ASME Certificate (NA-8100)'

u or. valid stamp is not required.

(3) Filing of a: quality assurance manual with ASME (NCA- -

3464) is not: required.

Data reports-will be completed.per the' authorized code- ,

-inspector utilized.. '

r. pi'pe support structural welding will be in accordance L with. ~ AWS D1.1-1988. Integral pipe attachment ' Welding .

l will be per ASME Section III (1986), Class 3 with exceptions as noted above.

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3.3.8.2 Design and Fabrication Codes

1. Cooling-Water System Desian & Fabrication Ihpth HT & LT Circuits) Code

a.

• Radiator ASME Section VIII, (1986), U Stamp

b.

• Expansion Tank ASME Section VIII, (1986), U Stamp

c. - Reservoir / Storage AWWA D100-73 Tank and Piping 3

d. Motor Operated ANSI B31.1-1967 Transfer Pump

e. Interconnecting ASME Section Piping'(Including III (1986) , Class 3 * *

• Equipment Vent Lines)

f. Exp.-Tank Fill, ANSI B31.1-1967 i Overflow, Vent and Drain Lines (beyond the First

,1

'Isolttion Valve)

2. Fuel Oil System

'a . - Day Tank. ASME Section III, ,

(1986) Class 3**

b. . Dirty 011 Tank API'650-1984 ,

c. Interconnecting ASME Section III1 Piping (1986), Class 3**

3. 'StartingLAir System ,

a. .

• Compressor Unit Manufacturer Std..

b.

• Air Dryer Manufacturer Std..

c.' .* Air Receiver' ASME Section 'VIII, i (1986) U Stamp.

• . Supplied under Diesel, Generator Specification M-870.

J* * - With' exceptions as'11sted in Section 3.3.8.1.

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a.

d.. Interconnecting ASME Section III Piping (except Manu- (1986), Class 3**

facturer's Standard Piping Sections)

e. Vent & Drain Lines ANSI B31.1-1967 (for air receiver, beyond First Isolation Valve)

4. Lute Oil System

a. Lube-Oil Storage API-650-1984 Tank

b.

• Lube oil Cooler Manufacturer Std.

c. AC Motor Driven ANSI B31.1-1967 Transfer Pump

d. Tank Vent & ANSI B31.1-1967  ;

Drain Lines (beyond First

' Isolation Valve) .

e. Engine / Aux. Desk ASME Section III.

Interconnecting (198 6) , Class 3 * * ,

Piping

f. Lube oil ~ Storage ANSI B31.1-1967 Tank Fill Line

5. Combustion Air and Exhaust System

a.

• Intake Air Filter Manufacturer Std.- I

b.

• Exhaust Silencer . Manufacturer Std.

c.. Piping 3

- 1. Exhaust ANSI _B31.1 (1986),

fabricated per SA 691 Class-

10. Stress analyzed per ASME Section:III Class-3 components using~ ANSI B3_1.1  !!

(1986) stress allowables' .

4

2. Intake ANSI B31.1 (1986),

fabricated per SA 134. ,

Stress analyzed . per ASME-Section III Class 3 ,

W , components using B31.1 ~1 (1986) stress allowables.

• Supplied under Diesel Generator Specification M-870.

• • With exceptions as listed in Section 3.3.8.1.

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3.3.9 Electrical Power Distribution and Switchaear 3.3.9.1 Electrical Power Distribution and Switchgear Design The electrical power distribution system will provide safeguards power to the D5/D6 diesel engine auxiliaries, and serve the. plant distribution systems when power is >

required from the diesel generator sources. The power

• . distribution system will consist of Class 1E 4160 and 480 6 VAC switchgear, 480 VAC- motor- control centers, distribution panel boards and transformers (as required),

and all interconnecting cable and raceway. In addition, this power distribution system will serve those safety

. _ . related building systems that are essential to emergency E diesel . generator operation- such as HVAC system loads.

Normal (non-1E) 480 V AC power distribution, and DC power  !

, distribution will be obtained from the existing plant.

M The electrical power distribution system and its components'will-be designed to have sufficient capacity

, to serve all loads identified at present, plus 20% spare ,

capacity in terms of both load curtant and spare hardware

[y ' for unknown future loads. Sepst&tian between the I'

safeguards-trains, between voltage classes and between fir _e zones will be provided in accordance with the requirements of Regulatory Guide 1.75, IEEE 384 and 10.

y -CFR 50 Appendix R. Refer to Section 5.3.9.2, Separation 1 Requirements. '

1

, Electrical interlocks or administrative controls will be utilized to_ prevent inadvertent paralleling of power j

q. sources in all cases where: alternate feeds are provided.

In addition, electrical interlocks will prevent auto ,atic  ?

closure of bus ties to,the opposite 1 unit when a diesel

1- ' generator.is providing power to-its dedicated unit.

, 3.'3.10 Diesel Generator Controls. Indication, and Alarms 3.'3.10.1 ' Diesel Generator Controls, Indication, and Alarm System Design

. .. s 2Each' engine generator. set will be provided'.with seven control panels: two engine auxiliaries desks, one bench board control panel, one vertical control panel, one exciter panel, one monitoring system remote terminel unit -

< (RTU) and one vibration monitoring panel (RTV) . Required Class 1E and non-1E 120V AC power will be provided to the control panels from'MCC distribution panels and' existing.

plant UPS distribution system. Required Class 1E and non-1E '125V DC power will be provided from existing plant 125V DC systems.

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9' s

The auxiliary desk' (one for each engine), located near

.the diesel generator unit, will include gauges to r indicate engine temperatures and pressures.

The bench board control panel, located in the diesel

, generator control room, will include instruments and p controls for.the diesel generator and auxiliaries plus the fuel oil transfer pumps, engine room ventilation, and control' room ventilation fans.

A-vertical panel, located in the diesel generator control room, will be provided to include additional instruments U

and controls for the diesel generator and auxiliaries.

A -generator exciter panel, located in the diesel generator control room, will include excitation, voltage regulation, and field flashing equipment, and current and voltage transformers for protective relays and ' power measuring instruments.

. 3.3.10.2 Trips and Interlocks All protective trips other than engine 'overspeed and iM ,. . generator differential overcurrent will be bypassed upon a~' receipt of an. automatic emergency start' signal in response to a safety injection - signal and will be

& annunciated in the main control room. No protective et trips will be bypassed upon receipt of an automatic bus t

undervoltage start signal.

. Protective trips will be provided_to automatically shut down the diesel engine and/or trip the diesel generator breaker, .and protect the ' diesel generator units from

possible damage or degradation:during routine testing. t Protective trips: will be in _ accordance with vendor

+ '

recommendations and will: consist of, but not be limited to the following:-

,o Overspeed o Engine Lube - Oil Low-Low Pressure E o Jacket Water.High-High. Temperature o Jacket Water Low Pressure-

• y, o -Crankcase High Pressure

,' o Lube 031 Sump Low Level o Generator' Bearing'High-High Temperature y

o Engine Bearing High-High Lube Oil Temperature o Reverse Power o Generator Differential Current o Generator Phase Overcurrent o Generator Overvoltage o ' Loss of Excitation

]

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In order to run the diesel generators during maintenance and testing, start permissive signals from each engine will be required from the following:

o HT & LT Cooling Water Expansion Tank Level

-o Engine 011 Sump Level o Engine Preheating-Water Temperature o prelubricating Pump Discharge Pressure All trip functions will be alarmed prior to trip -level  !

and the same sensing device may be used to generate both 1 alarm and trip signals through isolation relays, l An annunciator system will be provided to alarm abnormal operating conditions. This system vill consist of logic relays and solid-state components located in the vertical panel and' light boxes mounted above the benchboard.

3.3.10.3- Diesel Generator Monitoring Syst6m Design A non-safety related computer monitoring unit, located

'in the diesel generator control room, will include the following:

o pC-based data acquisition equipment to collect, store and process analog and digital input signals  !

from sensors in the diesel generator unit and auxiliary systems. I o- The system will be capable of monitoring operating parameters, interface with the plant computer, event sequencing, provide historica1' file, graphics and. a report generation.

I o The system will be capable-of providing 0-SV DC or- a 4-20 mA-DC analog or digital outputs for remote use.

I A non-cafety related; vibration monitoring panel' located in the diesel generator control. room, will:

o process input signals from vibration sensors mounted-on the engine block, generator bearings and radiator q fan assemblies, and 1 i

provide analog and digital outputs:for. remote.use.

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3.3.11 Diesel Generator Operatina Descriotion The mode of operation of each diesel generator set is determined: by .the position of the diesel generator control mode selector switch to either " normal" or

" maintenance". A brief description of the operating sequence is as follows:

1. Normal mode - Selection of " Normal" mode will allow automatic start-up, manual emergency start or test I operation of the diesel generator set. These  ;

. operating functions can be initiated from the Diesel Generator Control Room (" Local") or Main Control

, Room (" Remote") by using the " Local-Remote" selector switch.-

a. Automatic Start Mode -

Start of the diesel generator can be initiated -manually, or automatically by either a bus undervoltage and/or a Safeguards (SI) signal. In response

-to either of these types of automatic starts, the. diesel generator will accelerate to rated speed and voltage within ten (10) seconds (FAST . .;

START modo), from receipt of the starting signal.. l l

Emergency automatic start signals (manual cr SI) differ from the bus undervoltage start 1 signal, in that normal engine or generator trips' are not bypassed during a bus undervoltage-only automatic start.

A' Safeguards: (SI), or EMERGENCY manual start will block : all of the engine and . generator

.. trips, except those from manual emergency stop, .

generator differential', and engine overspeed.

b. Test Mode:- For' periodic test purposes, the_

diesel . generator may be - started and stopped through thel use of a manual- start-stop Test Switch. Two. (2) acceleration rates are l available in this. mode, SLOW and FAST. '

l The Slow start mode is operator-selected and ,

provides for a longer acceleration time via a pre-set speed ramp within the diesel generator governor control' system. The' acceleration time

'is approximately twice that of the FAST start. ..

mode.

NSP D6- 41 1

I

)

The FAST start mode is operator-selected and ,

provides a direct simulation of the rapid i acceleration rate required in response to any  ;

automatic start signal. '

Both the SLOW and FAST start modes provide '

automatic operation of the field flashing circuitry, resulting in a " Ready-For-Load" condition when synchronous speed has been reached.

2. Maintenance Mode -

Selection of " Maintenance" position will allow the following operation similar l to test mode except:

a. Permit individual operation of either engine 1 or 2 through the use of the diesel engine selector switch when the generator is

, decoupled. i

.b. Allows -hydraulic or electric governor operation,

c. Diesel generator set will not respond to an-

. emergency start signal while on maintenance  ;

mode.  :

'd. Maintenance operation can only be initiated from the DG Control Room by way of key-locked selector switches.

e. Field . flashing circuit- requires manual operation. i

3. Shutdown' Mode - Diesel: generator shutdown sequence may be initiated in either normal- (emergency 'or test) or maintenance . modes. Emergency shutdown can q~

be manually. accomplished through the use of an -

emergency stop pushbutton, located on the bench -

board in .the diesel generator control - room,. or automatically on receipt of overspeed or generator difforential. signal. While in maintenance or' test mode, manual shutdown is initiated-by placing the i start-stop selector switch to the'"stop" position or automatically .upon activation of any of the ,

. diesel generator protective devices. However, if an emergency'(SI) start signal is received while.in test mode, the diesel generator cannot be stopped through-the start-stop switch and must.go through the normal shutdown sequence upon termination of the emergency condition..

N$P 06 42 p

e

1 1

Following shutdown, the diesel generator set is L. immediately available for operation as long as'no maintenance and/or repair is to Fa performed.

4.- Load Sharing and Speed Control - Diesel' generator speed control and load sharing between the two engines is accomplished through the electric governors with associated speed sensors, LVDT rack transducers and actuators. Hydraulic governors are also provided as back-up in case of electric governor failure. Idle / rated speed setpoints and droop /isochronous modes are preset and will automatically override all manual settings upon receipt of an emergency start signal.

3.4 FUEL. OIL STORAGE SYSTEM

'3.4.1 Functional RerTuirements and Descriotion E

The following are general functional requir%ents and descriptions of systems and structures. Detailed design o , parameters and requirements are given ir. Section'3.4.2.

~

3 . 4 .1.1.- ' Basic System Description

, The Fuel Oil Storage System provides -lo'ig . term storage of fuel for the new Unit 2 Diesel Genere'cors (D! and D6) .

The D5/D6 Diesel Generator Fuel Oil- Storage Systam

. consists of four safety related fuel oil storage tanks and one non-safety related receiving' tank, and includes transfer' pumps, piping, instrumentation, and controls  :

necessary for supplying fuel to the diesel engines for seven days of continuous 100 percent operation at rated

-load,:without.being replenished. The four-storage tanks

• e will be contained in an underground concrete vault

. ' structure provided along the west wall of the new diesel L generator building. The vault will provide the tanks and

piping components protection from

tornado generated I~

missiles and flood. It also provides a 3-hour fire o protection barrier between' tanks for. each diesel L generator set'.and from surrounding environment.

The-receiving tank is provided:to receive and' hold fuel-  ;

L '

oil from delivery. trucks for testing prior to placing oil in the storage. tanks. The' receiving-tank will be located.

B outdoors and mounted on a diked concrete' pad alongLthe h

south wall at the west corner of the~D5 and D6' Building.

L o

NSP 06 43 I

i Two storage tanks will be ' dedicated- for each diesel  :

generator set. Two 100% capacity transfer pumps will be provided for each diesel generator set with suction piping interconnected and valved so that either pump can be used in transferring fuel .com either storage tank to the day tank of the associated diesel generator set on day tank low level control signal. This provides system flexibility to ensure operability of' both diescl generator sets under all potential single active failure conditions.

The storage tanks are filled by means of gravity flow from the outdoor receiving tank. The storage tank to be filled is selected by manual valve operation.

3.4.1.2 Tank Capacity

a. Storage Tanks I

^'Each diesel generator set will be provided with onsite storage that has capacity to allow - operation of the

' diesel generator set for seven days at maximum rated i load.- The conservative calculation method given in ANSI N195-1976 will be used to determine the size of fuel oil storage ~ requirements for.each DG set.

i L'

The tanks are sized so that if one is not in service, the capacity of the remaining three is sufficient to supply D5 and D6 continuously for seven days at actual: load.

I L In addition to . level instrumentation, each fuel oil storage tank will be provided with a stick gauge connection for determining fuel level in the tank.-

The cconnection will be accessible through a ceiling hatch.

l.'

b.- Receiving Tank 1

The receiving tank will be designed to receive and hold u fuel oil until' it ' has- passed all required testing for i use. The tank will have usable capacity of 15',000 I gallons which is equivalent to two regular fuel oil shipments of 7,500 gallons each.

l

' 3 . 4 .1. 3 - Pump Requirements '

~l

a. Transfer Pump There will be four transfer pumps for the D5 and D6 diesel generator sets, two for each diesel generator set.  ;

All pumps will be identical and have sufficient head and l 1

NSP+D6 44 l

capacity to transfer oil to the associated day tank. .The pump will start _when the day tank reaches the designated low liquid level. The transfer pump suction and discharge lines for each pair of pumps associated with the diesel generator set will be cross-tied to allow fuel to be transferred from either storage tank to the day tank by either transfer pur.p.

b. Recirculating Pump A; recirculating pump wjl1 be provided to keep the oil.

temperature in the receiving tank above the fuel oil cloud point (-10'F) by nechanical heat energy during cold weather prior to transfer to the storage tanks. A-cleanup filter is provided on the pump discharge side to provide ._ filtering while the fuel oil is being recirculated.

3.4.1.4 Process Piping s

The- fuel oil transfer piping will be capable of ,

transferring oil at design temperature and pressure from.

the storage tank to the day tank. The return line from the'. day tank will be sized to handle continuous overflow by gravity to the storage tanks. ,

With-the exception of the transfer pumps, controls, and relief valves, no other active.or automatic devices are.

required for. operation of the fuel oil transfer process.

L The storage tank piping system will be designed to alloJ-manual control'of. flow.- The pipin'g system will allow oi.

stored within each fuel oil storage tank to be pumpet directly from one _ safety related storage tank'to_the other' storage tank through a cleanup filter. ,

The receiving tank recirculation piping will.be' capable

. of . recirculating . fuel oil from the ' receiving tank"by means - of _the recirculating pump, through the cleanup  ;

filter and return back to the. receiving tank.

Sampling points will be provided as required - at the 3

inlets _ to'. filters. Samples will be taken- while-recirculating storage-tank contents.

_3.4.1.5 Electrical Power Supply and Controls

.The; Safeguards electrical power supply to the fuel oil transfer pumps will be 480 Volt, 3-phase, 60 Hertz,--and-of adequate capacity- to power the drive motors.

Safeguards Class lE 120V AC and 125V DC power Will be-NSP 06 - 45 l

[

1 l

l l

provided for all associated control and instrumentation- l circuitry.- Non-1E power will be provided for indication and alarm circuitry.

Controls for the fuel tank transfer operation will be f

automatic, with provisions for manual override, The storage tanks will be provided with high and low level alarms to be annunciated in the DS/D6 control rooms. High pressure differential across the transfer

, system fuel strainers or filters will also be annunciated in the D5/D6 Control Room. The storage tanks will be provided with level indication to be displayed locally and on the DG benchboard control panels. .On-off operatien of the transfer pumps will be initiated by 1 level owitches- in the fuel oil day tanks. Operating- i i status will be monitored and alarmed. '

i The receiving tank will be provided with a. locally mounted level indicator. The recirculating pump will be provided - with -on-off operation initiated by a local control switch. Trouble in the recirculating pump and  ;

associated cleanup filter will be annunciated in the diesel generator control room through low /high 'l differential pressure switches across each pump and filter.

Temperature inside the below-grade vault will_be above

, the fuel oil cloud point' temperature since the vault is insulated-and located below the frost line; thereforo, I heat tracing'will not be required. '

O f 3 . 4 .1. 6 - [ Operation Q Fuel-oil shipments, received by truck delivery, will be l held-in the receiving _ tank and-tested for specification' ,

js conformance. After specifications. are verified by test,  ;

J the_ fuel ~ oil-will be transferred to the storage tanks. .,

g on a periodic basis, the fuel oil in each storage thnk [

d i

will'be tested for water content,--sediment and viscosity. '

Algae growth in the storage tank will be inhibited by an s p additive furnished in the fuel oil.

3.4.2 Desian Recuirements 1 K

3.4.2.1 Tank Design Q; a. Storage Tank NSP D6 46

The fuel oil storage tanks will be horizontal cylindrical tanks made of materials compatible with the stored diesel fuel oil. Galvanized material will not be used. The tanks will be shop fabricated and will meet the requirements of NFPA 30 and designed and fabricated in accordance with the requirements of ASME Section III, 1986 Edition, Subsection ND with the following exceptions:

(1)= No N-Stamp is required.

m (2) Maintenance of a current ASME Certificate (NA-8100) or valid stamp is not required.

(3) Filing of a quality assurance manual with ASME (NCA-3464) is not required.

Data reports-will be completed per the authorized code inspector utilized.

b.  ; Receiving Tank The fuel oil receiving tank will be vertical steel cylindrical. shop fabricated atmospheric tank designed and fabricated to the requirements of API' 650. The tank will be ' installed outdoors on a Non-Seismic Category I concrete pad with vertical concrete walls (diked). The dike is' sized to contain the tank volumetric contents, should a leak or rupture occur, plus an additional volume equivalent to.30 minutes of fire suppression water flow.

The 1 tank will 'be ' located such that the outside tank surface is separated from any adjacent structure by at least 5; feet 'or '1/3 of-the tank diameter, whichever is greater.'

'c.- . General AllLtank' fill and drain connections will be designed to

. avoid ' any turbulence that may stir up the sediment accumulated at.the bottom of the tank. All tanks will be provided with a drain connection to remove sediment.

or water from the tank bottom.

Each storap tank will be provided with liquid level indication (analog loop), to be monitored inside the D5/D6 Thlilding. (NSP UST policy for inventory requirement)

, on the Benchboard panel.

The receiving tank will be provided with spill protection at the fill connection piping ~by means of a catch basin.

w 06 47

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. ;4 _

Nhg[ I 1

Fill inlet connection and vent outlet connection will be protected from - flood conditions and will be positioned above the maximum probable flood level.

3.4.2.2 Underground Storage Vault' The emergency storage tanks will be installed in a Seismic Category I reinforced concrete vault enclosure located below seismic grade level and adjacent to the west wall of D5/D6 Diesel Generator Building. The vault will provide the required 3-hour rated. fire. protection barrier, including D5/D6 West wall penetrations, for enclosed fuel supply tanks, and in addition, will withstand the nffects of tornado generated missiles, site flood, and buoyancy force considerations. The vault will be a vital area.

The vault will. be divided into two compartments by a concrete partition wall to separate each pair of tanks serving-a single diesel generator set and-provide fire and. flood protection between each diesel generator sets.

fuel supply equipment.-

p The vault will be sized to provide a minimum clearance of 15. inches from all tank surfaces, as well as allowing convenient accessibility to the tanks for inspection and repair. Leakproof hatches will be provided on top of the vault for tank internal and external inspection access and to allow removal of tank internal strainers and

'( '

baffles and other-appurtenances. Level instrumentation will be bottom mounted.

The underground storage vault will be insulated 4 sufficiently to protect the fuel oil from reaching a

, minimum system operating . temperature. The vault m' temperature will be indicated and monitored by

'l operations.

The vault will be provided for containing leakage of the-tank contents and any accumulated seepage water. The vault floor will slope to a sump, which will contain a t leak detector. Leak detection instruments will be provided to. alert presence of fuel or water in the sump.

C

, The detailed structural design requirements for the concrete vault structure will be as specified in Section 4.0 The vault's walls and bottom will be provided with a waterproof membrane. All hatches and penetrations on the top slab will be leak-tight.

NSP D6 48 l

>=

'3.4.2.3 Pump Design o

a. Transfer Pump The transfer pumps will be of the rotary positive displacement type. The pump casing will be constructed of carbon steel or other materials that are compatible with diesel fuel oil. The transfer pumps wil1 ~be located in the.D5 and D6 pit areas at an elevation that will ensure the available net positive suction head . (NPSH) will conservatively envelope the required NPSH. The transfer pumps of each diesel generator set will be

, separated by a 3-hour rated fire barrier.

F b. Recirculating Pump "bi The receiving . tank recirculation pump will be of the ,

horizontal centrifugal type. Pump casing will be l

& constructed'of carbon steel or other material compatible '

W with the stored fuel oil. The pump will be located in

', (

the D6 pit area. -

L 3.4.2.4 Piping System- .

-t o

n All piping, fittings, strainers, valves, and associated y, components and supports connecting the emerger.cy' storage

f y

tanks,-transfer pump,. diesel engine ~~ day tanks, and the emergency fill station'will be designed.and fabricated E to the requirements of ASME Section III, 1986 Edition, Subsection NDA with the followina exceptions:

l

-(1)- No N-Stamp lis required.

(2) Maintenance of a current ASME Certificate (NA-8100) f, or valid stamp is not required. '

&. . t Y'# (3) Filing of a quality assurance manual with ASME- (NCA-3464) is not required. f s; e W '

Data reports will be~ completed per the, authorized-code  :

inspector utilized.

{ j

\ All7 piping and isolation valves protecting the . safety ,

W related pressure boundary will be located within the  !

Category I diesel. generator building or Category I buried  !

vault structures where it is protected from tornado i p, missiles and site flood conditions. pipe supports will -F

• h L be designed to the requirements of ASME Section III,1986 Edition, Subsection NF with exceptions as noted above.

Pipe support structural steel welds will be per AWS Code D.1.1.

NSP 06 49

V \

l All piping and components associated with the receiving tank and connected -beyond the safety related piping pressure boundary isolation valves will be designed to .i the requirements of ANSI B31.1 and designated as non-safety related. The recirculation pump piping loop will .I contain a duplex cartridge type filter which will provide )

high solid removal efficiency for cleanup of any new fuel ,

received at the storage facility. A differential pressure alarm will be provided to alert the operator of a plugged filter. Manual action can then be taken to valve in the redundant filter.

Sample stations will be provided in the transfer piping to the day tank and also at the receiving- tank 1 recirculation piping. All stations are located inside

, the diesel generator engine rooms to allow convenient fuel test sample retrieval for the required chemical testing of stored fuel.

All fuel oil piping will be located inside the concrete.

structures or over concrete slabs. Containment curbs as required (dikes) will .be provided to collect all potential' fuel- leakag'e or spills .to prevent ground >

contamination. These structures will be provided with local leak detection ' instrumentation to provide indication of any leakages from piping.

The transfer pumps, recirculating: pump and all fuel oil piping. will be designed to allow for -inspection, j.

maintenance and testing. . Pump and valve maintenance envelope. space requirements will be'in accordance with manufacturer's recommendations. . Flanges are permitted l: where required for maintenance (e.g. pump connections).

piping ~ material will-be of. carbon steel having.a minimum ANSI pressure-temperature rating of 150 lbs.

The contents of any storage tank can be recirculated

'through a 5 micron ~ duplex filter without preventing the ,

other storage tank for the same DG set from feeding the day tank. 1 Any storage-tank can receive fuel from any other storage-tank while the first -storage. tank is . feeding its associated day tank.

WSP 06' 50

i

c '

3.4.2.5 Electrical and, Controls Electrical power distribution will be accomplished by means of-a 480V AC, 3-phase, 4-wire, grounded system.

Transformations from this service to 120 and 277 VAC (both single-phase and three-phase) will be provided as necessary.

Overcurrent protection will be provided - by means of molded case thermal-magnetic circuit breakers. Proper coordination of all overcurrent protection devices will be provided down to (and including) local panelboard(s).

Circuit breakers for . safety related circuits will be testable.

i Separation . between redundant trains (by 3-hour rated barriers) as well as that required between IE and non-1E circuits will be provided in accordance with Regulatory Guide 1.~75, IEEE 384, and 10 CFR 50, Appendix R. Refer l to Section 5.3.9.2, Separation Requirements.

All controls' and instr'imentation will be electric and/or electronic and will ~ be designed to operate within the design basis environmen,. of 50'F to 120'F inside the DS/D6 engine room' areas. Electrical equipment inside the fuel storage tank. vault will be designed for 10'F to 120'F. i

-The receiving tank level ~ indicator located outside will be designed'for -30'F to 120'F. ,

Transfer Pump = control switches'and storage tank. level ,

indicators: .w ill be ' located on the diesel generator  ;

control-room! bench. board. All pressure indicators and the receiving tank pump controls and additional storage tankilevel. indicators-will be mounted locally.

The following conditions'wi.t1 be monitored and alarmed in the diesel generator control . room with a common "

trouble alarm in the main-' control room:

High and~ low storage tank levels.-

~

a. '

L -b. Low-. differential pressure across the recirculating l: pump or high differential pressures . across the "

p . recirculating clean-up filters.

g Signals from'the fuel storage tank level sensors will be.

L transmitted'to the RTU for computer monitoring. Power

! supplies for the-D5 and D6 fuel oil. storage tank pumps will be separated for redundancy and protection from common mode failure. ' Power cable will be routed Nsp 06 51

s

Y 1

separately from any control wiring. Non-safety related l power and control cables for the receiving tank and its l pump will not be routed with safety related cables or i piping.

3.4.2.6 Mechanical Design and Fabrication Codes The design f abrication code for piping and equipment for the fuel oil storage system are as follows: 1 3.4.2.6.1 Pipe / Pipe Support Installction Codes 1 ASME Section III (1986) Class 3 with the following' exceptions:

(1) No N-Stamp is required.

(2) Maintenance of a current ASME Certificate (hA-8100)  ;

or valid stamp is not requirec.

(3) Filing of a quality assurance manual with ASME (NCA '

3464) is not required.

Data reports will be completed per the authorized code inspector utilized.

. Pipe support welding-will be in accordance with AWS D1.1-1988. Integral pipe attachment welding will be per ASME.

Section III (1986), Class 3, with exceptions as noted above. .

i fl r

WSP 06 52 s

-3.4.E;6.2 Design and. Fabrication Codes Desian & Fabrication Code

1. Tanks-a.- Emergency Storage Tanks ASME,Section III (1986), Class 3**

b.> Receiving Tank API 650-1984 i

2. Pumps

a. Transfer Pumps Viking Pump Manufacturer's Std.

b. Recirculating Pump Viking Pump .

I i

Manufacturer's Std.

3. Piping, Pipe Support Components and Valves i a.- Fuel 011' Transfer Piping ASME Section III System (except vent and (1986), Class.3**

drain lines)'

b. Receiving. Tank. Piping & . ANSI B31.1-1967 Recirculating Piping.

System '

-c. . Storage Tank Vent ASME Section III (1986), Class'3**

'd . . Drain Lines ANSI B31.1-1967

.after First Isolation Valve

• • WithLexceptions as listed in Section 3.4.2.6.1.

3.5 DESIGN STANDARDS-l In addition to the codes and standal , listed in;the

. fdesign requirements given above in Sections 3.4.2.6 and' 3.4.2.7, the following1NUREG 0800, IEEE standards, and

. regulatory guides ure adopted in whole as design criteria E requirements . for > the ' DS and D6 Diesel Generator and.-

Auxiliary Systems-as described in Section 3.0.

E

'Within the existing plant boundary.the-existing design.

Un' . criteria as defined in the USAR~will apply. except as

.noted otherwise in.this document.

1 NSP 06 53 l

l

u . . _ . .

1

l I

l 3.5.1 NUREG 0800 Standard Review Plan (SRP)

SRP 9.5.4 Rev. 2,-7/81 Diesel Engine Puel Oil Storage and Transfer System (except no fuel oil temperature indication .

is provided. Building temperature is controlled and vault temperature is monitored)

SRP 9.5.5 Rev. 2, 7/81 Diesel Engine Cooling Water System 'l SRP 9.5.6 Rev. 2, 7/81' Diesel Engine Starting System SRP 9.5.7 Rev. 2, 7/81 Diesel Engine Lubrication System i .SRP 9.5.8 Rev. 2, 7/81 Diesel Engine Combustion Air Intake 1And Exhaust System BTP PSB-2 Rev. 7/81 Criteria And l O', For Alarms

/* Indications Associated With

? , Diesel-Generator Unit Bypassed 4 And Inoperable Status 3.5.2 TEEE Standards IEEE 279-1971 Criteria for Protection Systems for Nuclear Power Generating Stations -s IEEE'308-1974. Criteria for Class IE Electric Systems for m Nuclear Power Generating Stations IEEE 323-1974 Standard for Qualifying Class 1E Equipment

/ for Nuclear. Power Generating Stations '

["i (Note: IEEE 323 is . invoked as a guideline

~

document' to provide a basis for the 4 determination of: qualified. life of-M,w equipment.- lit is . not intended . ' to be

• a f i.e invoked as a . basis .for environmental' qualification. 10 'CFR 50.49' requirements which'are met by methods described in RG H .1.89 (endorsing IEEE 323) do not apply to y the mild environment - of ' the new D5/D6-

' Building).

J T

IEEE 338-1977- Standard Criteria for the Periodic Testing

~o f Nuclear Power Generating Station Safety l

Systems IEEE 344-1987 Guide for Seismic Qualification of Class I Electrical-Equipment for Nuclear, Power Generating Stations wsp os 54 1: ,

b 1: ,

J

. i

l

7..- l (Note

Seismic qualification for the DS/D6 Diesel ' Generator, HVAC duct dampers, l damper actuators, and the Class IE Motor '

Control Centers cites the 1975 revision. I Refer to documentation for details.)

IEEE 379-1972 Guide for the Application of the Single Failure Criterion to Nuclear Power Generating Station Protection Systems IEEE 384-1981 Criteria for Separation of Class IE ,

Equipment and Circuits (See note under Reg. Guide 1.75)

(Note 1: The 1981 revision is specified because it addresses comments contained in Regulatory Guide 1.75, Rev. 2 on the 1974 revision of the stanc. Jd. )

(Note 2: The identification requirements

. of IEEE 384 for tagging intervals of cable, cable tray and raceway may not be strictly followed. Guidance provided by i the USAR will adhered to as introduction of a different set of requirements would 2 be confusing.)

ic IEEE 387-1975. Diesel Generator Units as Standby Power' supplies 3" (Note

'Certain provisions -of the 1984 revision of the standard are included in the D5/D6' Diesel Generator specification because.they provide guidance for issues 4 not: fully addressed in the 1975 revision which was referenced.in Regulatory. Guide 1.9, Rev. 2. These provisions include Y Appendix A guidance for. development ofia

[ load profile , Appendix B.for.the format J4 , ' to- define diesel generator service-

!@ conditions,. and' Table B2 format for.use C' in defining those components with less-y f than a 40 year operating life.)- 1

'3.0.3 Reaulatorv Guides Regulatory Guide-1.6, 3/10/71 Independence Between Redundant Standby (On-site) Power Sources and Detween Their-Distribution Systems 1 ).

ll i

i  :,

p, , NSP.D6 55 l

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l Regulatory Guide 1.9, Rev. 2, 12/79 Selection Design and Qualification of. Diesel Generator Units Used As Standby (On-site) Electric Power Systems I at Nuclear Power Plants 1 Regulatory Guide 1.29, Rev. 3, 9/78 Seismic Design Classification Regulatory Guide 1.32, Rev. 2, 2/77 Criteria for Class 1E Electric Systems for Nuclear Power Generating Stations 1

Regulatory Guide 1.47, 5/73 I Bypassed and Inoperable Status Indication for Nuclear l Power Plant Safety Systems Regulatory Guide 1.53, 6/73 .

Application of the Single Failure Criteria to Nuclear

., Power Plant Protection Systems Regulatory' Guide 1.62,-10/73 Manual Initiation of~ Protect' e Actions-Regulatory Guide 1.75, Rev. 2, 9/78 Physical Independence of Electric Systems I (Note"1: . Separation criteria of RG 1.75.and IEEE 384 will'be. met within the new diesel generator structure.

As a minimum, requirements of the USAR will be met for-new f equipment and system . designs within . the existing plant.)

(Note 2: -For regulatory position C.10, cables will be marked: at 10 foot intervals, rather than the 5 foot interval .specified, .in conformance with USAR. Section 8.7.5 which has been found to be - sufficient to ensure proper _ cable installation.) .

Regulatory-Guide 1.81, Rev. 1, 1/75 Shared = Emergency and Shutdown Electric Systems for Multi-Unit Nuclear Power Plants 1 .(Note:.For regulatory position C.3, the-onsite emergency a.c. electrical system for each unit will be separate and

independent,- but the ~ capability to interconnect the ,

emergency'(safeguards) 4kV a.c. buses within separation- l

. criteria. divisions (i.e. , Unit 1-Train A~ to Unit 2-Train A, - etc. ) . Will be retained for use during Station ' Blackout (access . to Alternate A.C. (A.A.C) source) and other similar circumstances.)

l u

NSP D6 56 l

l l

1 1

Regulatory Guide 1.100, Rev. 2, 6/88

. Seismic Qualification of Electric and Mechanical Equipment for Nuclear Power Plants Regulatory Guide 1.108, Rev. 1, 8/77 Periodic Testing of Diesel Units Used As On-site Electric Power Systems'at Nuclear Power Plant Regulatory Guide 1.118, Rev. 2, 6/78 Periodic Testing of Electric Power and Protection Systems 3.5.4 NFPA Standard,g NFPA 30-1987 National Fire Protection Association Standard for Flammable and Combustible Liquids Code

.NFPA 37-1984 National Fire Protection Association Standard for Stationary Combustion Engines and Gas Turbines (Note:' Paragraph 5-8.1 can not be met. Fuel will be fed to the engines by gravity from non-integral day tanks.)

'3.5.5 ANSI Standards ANSI-N195-1976 Fuel Oil Systems For Standby Diesel Generators 3.'5.6 Northern States Power Stand gdg-PrairiciIslanti -LUpdated Safety Analysis ueport Prairie Island.-iFinal Safety Analysis Report Prairie Island Technical Specifications NSP ~ Underground Storage Tank Policy Compliance Guide, dated' October 3,: 1989 (exception: inventory fuel management system not provided).

Prairie Island Operations Manual Section Hil, Electrical Construction Standards.

Prairie Island Security Plan.

3.5.7 Fluor Daniel Procedures Pipe Stress Analysis and Pipe Support Design Procedures

'for SBO Projects Procedures No.-834473-1 (latest Rev.)

NSP+D6 57

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4.0 NEW D5/D6 BUILDING The new DS and D6 Building will house two SACM diesel generators (D5 and D6) , with associated etntrol panels, auxiliary equipment, electrical distr.'bution equipment, fuel oil and lube oil tanks, and diesel engine radiators.

The DS/D6 Building will be an above-grado Seismic 4

Category I reinforced concrete structure, designed to 4 withstand design basis load combinations. The DS/D6 Building will be located along the west wall of the Auxillary Building (Column Row 15) between Column Rows G and K, and has approximate dimensions of 68 ft. x 124 ft. x 61 ft. high including penthouses. The DS/D6 i Building will not be connected structurally to '.h e existing main plant Auxiliary Building and Turbine ,

Building. The existing cooling water emargency discharge i line, Turbine Room Alternate Discharge Line, Fire Hose Station HH7, the high mast lighting and below-grade

. communication duct bank and security cable are to be j relocated to accommodate the new building. Euilding i space will be p:rovided for future addition of beeteries, j battery. charges, inverters, McCs, and distribution panels. Figures 4-1 through 4-9 depict the layout of the DS/D3 Building.

Since the new D5/D6 Building will occupy the area in which the condensate storage tanks and associated piping j were situated, the Condensate Storage Tanks 21 and 22  ;

were relocated to west of the Unit 2 Containment Building along the south wall of the new D5/D6 Building. .I 4.1 SEISMIC DESIGN CLASSIFICATION The seismic design classification for the D5 and D6 l building systems are as follows:

~

4.1.1 Structures l

The DS/D6 . Building will be a Seismic Category I structure.  !

4.1.2 Electrical / Mechanical /HVAC Buildina Support Systems All safety related electrical, mechanical and HVAC systems and components will be designed to withstand a Safe Shutdown Earthquake (SSE) and remain functional (Seismic Category I) . All non-safety related systems and I components and their supporting systems will be designed to ensure that the SSE would not cause their structural failure resulting in damage to safety related systems or components (Seismic II over I).

wsp 06 58

4.1.2.1 Electrical Support Systems The potential failure of electrical support systems that are non-safety related anywhere within the Building could endanger the functioning of safety related systems and will therefore be supported seismically.

The mounting of lighting, communications, fire detection and security control system components will be designed to withstand seismic conditions (Seismic II over I). I Normal power distribution equipment, raceways and ,

supports within the new building will be supported seismically to preclude the- possibility of damage to safety related equipment (Seismic II over I) . Safeguards power distribution equipment (seismic active), raceways and supports (both seismically passive) will be seismically qualified.

4.1.2.2 Mechanical Support Systems All station air, plumbing, fire suppression, and other non-safety related piping and supports within the new Building will be seismically supported to withstand the [

4 SSE without structural failure (Seismic II over I) . Non-safety related piping will be supported seismically to assure that the failure of the piping cannot damage safety related systems or components (Seismic II over I) .

4.1.2.3 HVAC Support Systems l

}

I All components of the'D5/D6 Building HVAC System shall be Seismic Category I. Instruments and controls that are  !

required for the operation of safety related fans and i dampers will. also be Seismic Quality Class I.

Instruments that perform indication and alarming and l controls for non-safety related cooling equipment will be supported seismically (Seismic II over I).

4.2 SAFETY DESIGN CLASSIFICATION l

[

' The safety design classification for the DS/D6 building systems are as follows:- ,

4.2.1 Structur_qa All structures are classified as safety related or non-safety related.

l li$P*D6 $9 i

w_.

SAFETY CLASSIFICATION OF STRUCTURES Structure ClassificatioD D5/D6 Building Safety Related 4.2.2 Buildino Sunnort Systems The design classification for electrical, mechanical &

HVAC support systems is as follows

1. Electrical Support System Classification

a. Lighting, communi- Non-Safety Related cation, & normal power i distribution I

b. Safeguards power Safety Related &

distribution system Class 1E components serving HVAC

c. Fire Detection Non-Safety Related, Fire Protection Related

d. Security Control Non-Safety Related, Security Related

2. Mechanical Support Systems Classification

a. Plumbing, service Non-Safety Related air, & fire suppression

b. Fire suppression & Fire Protection systems Related'

3. Normal HVAC Support Systems Classification

a. Components of the. Non-Safety Related lube oil storage tank / fuel oil day tank rooms exhaust system

b. D5/D6 control room Non-Safety Related ,

c. Switchgear Area Non-Safety Related auxiliary cooling system usP 06 60

p. ,,

ir "s

d. Controls for auxiliary lion-Safety Related

. heating, cooling &

ventilation systems i

.c. Instrumentation (i.sdi- Non-Safety Related cation & alarm only) x f. Future battery room Non-Sarety Related j

. Safety-Related-HVAC Support Systems 4.

)

a.

Ventilation fans / modu- Safety Related

!- lating dampers (control  ;

N switches, temperature l sensors, transmitters & l ty.

controllers) l f b. Instrumentation'(indi- 'Non-Safety Related cation & alarm only)

C o

~ 413 ' BUILDING STRUCTURE DESIGN-14.3.l' Desian'Loqsis All structures w'ill be designed lto withstand various .

1 loads as'follows:

m All mechanical and electrical equipment and appurtt inces 4 will. be' Esuppprted .in accordance. With. their design classification. . Supports;for non-safety related ltems

, will be-designed 1and-installed such that;their. supports .

do not : fail under seismic conditions and : endanger 'the.

y operation of'any adjacent safety-related items,(Seismic-a ,, .

.II1overI).

A111the major ' '. ads to be .ent'ountered or to be: postulated

/ ,

are listed below.. All the loads listed, .however, :are not

q, .

.necessarily. applicablet tot all' the. structuroscand

• heir-ic +

elements. Louds =and the applicable ~ load Lcombinations for-which each structurechas to be designed'will' depend.on

~ tho' conditions" to l which thet' particular structure is:

' subjected. . .

<m . o . . .t

. 3 ? l". l '- Dead lLoadsE(D)

+

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~'

.The -- dead loadsT include t!.e weight ~ of framing, roofs, ,

floors, walls, prtitions, platforms and all permanent: .,

); 4 equipment. and materials. The vertical and ~ lateral

~

,pressutssLof liquid.will also be treated as dead loads, a 1-. ' asi indicated ~in ACI Codes. ,

['usp06 61

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a ,.. att # >

$3

, 7 ll D ,,

a l

Floors shall be checked for the actual equipment loads.

For permaner.tly attached small equipment, piping >:enduits and cable trays, a minimum of 50 psf shall be adced where appropt 4 %te. I 4.3.1.2 Live

• 13 (L and L.)

Live loads.will be as specified in Subsections 1 and 2, i below, but in no case less than the minimum design live  ;

loads specified in 3.

1. Live Loads (L)

, These include floor area loads, equipment handling loads, and similar items. The floor area live load will be.

omitted from areas occupied.by equipment whose weight is  !

specifically included in dead load. Live load will not be omitted under equipment where access is provided (for i example, elevated tank on legs).

A The. lateral earth pressure will be treated as live load

-a as. indicated in ACI codes.

t

2. Live Loads During- Operation (L.)

, In loading combinations including earthq-.1ke, the live g . loads shall be limited to "L", which. is defined as the  ;

live load. expected . to be' present when the plant is t y ,

4 operating. ,

3; j, " v The value' of L. will be considered tt; M 50 psf.

3. l Minimum Design Live Loads.

p , ,

L - b' ,

Tho' following; minimum 1ive dscwill be used in the-

' design. .

'Certain~ other a", icable loads 'are listed s (separatelyf i n' succeeding'seccions, y j T Roofs. 50 psf j y Stairs &' Walkways 100. psf-t* Railings-1 25' psf or D. '

200 lbs. applied'_

{

, in any direction j yp at top of railing, .j y; @ n Platforms & gratings 100 psf- '

0 e , Ground Floor-(except 6 control room- 500 psf C1 Control Room 250 psf (W All other floors 200 psf ht NSP*D6 62 o

q

4.3.1.3- Construction. Loads St;uctures and components will be designed considering all applicable construction load conditions.

Y 4.3.1.4 Earth Pressure Earth pressures will be in accordance with the requirements of UBC. In load combinations, loads due to earth pressure will be treated as live load.

- 4.3.1.5 Groundwater Pressure For structural and buoyancy calcu?a*. ions, the high groundwater table will-be as specified below:

Water Levels-(Ref. USAR)

Normal. ground water El. 67486" Low ground water El. 672'6" Design Flood El. 703'7" The effect of.a design flood will' also be considered.

In load combinations,-loads dt3 to water-pressure will be-treated as dead. load.

4.3.1.6 Environmental Loads (USAR,Sec. 12)

.These consist of. wind (W) and snow 1c ds.

~

Snow loads of 50 lbs. per sq. f t, of horizontal projected area will be used in .the design of structures and components exposed to snow.

The design wind speed'is 100 mph. Wind' pressure, shape f actors, -gust factors and ' variation of winds with height

- shall be determined 'in faccordance with the; procedures c

given in the American Society of Civil Engineers, .( ASCE) 3 9er.No. 3269 " Wind' Forces on Structures", Transactions of inet American Society f of Civil. ~ Engineers, Vol.-126, Part II (1961).

S 4.3.1.7' . Tornado Loads (W.) (Ref. Regulatory Guide 1.76)

Y '

Tornado, loadings.used in the_ design willLconsist of the h _ f ol2owing::

9 .

a.- A lateral forceccaused by acfunnel of wind having

'f "

a

~

rotational speed of 290 mph and a maximum 9 translation speed of.70 mph.

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b. A pressure drop of 3.0 psi, the rate of pressure drop being 2.0 psi /sec.

c.- The design tornado generated missiles as shown on Table B.

4.3.1.8 Seismic Loads l, The following seismic loads will be used in the design.

a. Operating Basis Earthquake (OBE) (E) -

The Operating Basis Earthquake loads based upon a r.ximum' horizontal giound acceleration of 0.06g. -

b. Safe Shutdown Earthquake (SSE) (E')

The Safe ' Shutdown Earthquake loads based upon a maximum horizontal ground acceleration of 0.12g.

c. Uniform Building Code Earthquake Loads All~ structures that are not required to be designed for OBE or SSE loads as shown above, will - be

. designed-in accordance with the- requirements of the

-Uniform Building Code. This code specifies the location of . the plant site' to be in: e "Zero".

earthquake- area. .. However, for conservatism earthquake loads applicable:to Zone 1 areas will be  !

p used it.'the design under this category.  ;

4 . 3 .' l . 9 ' 1 Temperature Loads - (T. or Ta).

4 Thermal: ef fects - and loads - during normal operating or shutdown conditions', based on the most critical transient.

v.

or steady state condition.;

-f f 4',3,1,10 . Pipe Reaction . Loads (R. or_ Ra)-

~3. ,

• Pipe. reactions during normal operating or shutdown- t conditions, ' based on. the most ' critical transient ~or

.- steady' state. condition.: ,.

j 4'.3.1.11 .High. Energy' Pipe' Break Loads; [

t -

The Starting Air- System is considered a high energy system o according to the criteria established in SRP.

&* J e '

- 3 . 6'. 1 . However,.since-the~ maximum line size in:the Al'r :t w Start - System does. not exceed 1. inch, neither a.

3T .ci rcumferent ial nor- a longitudinal- line ' break ' need be

considered.: If'such a line break were to be considered, therfollowing. loads'would.be included. ,

NSP 06 64 6

i i g ' j 1 k f _ ..m_ _ _ _ _ _..__.___.____________..__________s

1 , ,

m P. - Pressure equivalent static load within or across a compartment generated by the postulated break, and including an appropriate dynamic load factor to account for the dynamic nature of the load.

T. - Thermal loads under thermal conditions generated by the postulated break and including T.,

R. - Pipe reactions under thermal conditions generated

'by the postulated break and including R..

( ~ Y, - Equivalent static load on the structura genernted

.by the reaction on . the broken high-energy pipe during the postulated break, and including and appropriate dynamic load factor to account for the

' dynamic nature of the load.  ;

A Y, - - Jet _ impingement equivalent static Inad on a structure ~ generated by the postulated break, and including an appropriate dynamic load factor to

(, account for the dynamic nature of the load. i Y. - fMissile Limpact equivalent static load on a structure generated by or during the postulated break, as from m?  : pipe whipping, and including an A.,repriate dynamic -r load. factor to account for the dynamic nature of the l

~1oad,

.o .

4 In determining an appropriate equivalent static load s , for ; Y,, Y,, and Y., elasto-plastic ' behavior may be

+ assumed with appropriate ductility ratios, provided c cxcessive deflections will' not result in loss of

' ~

q . function-of any safety-related system. I S

Standard Review- Plan Load ~ Combination lists' all these -loads, so the definition of these loads will-be~ required. i I'l n, x i4.3.2' >

' Structural' Deslan Basis

[ 4.3[2'.1 Ceneral q

<' All steel. structures - will be designed by the clastic q

working ' . stress- method. 'All -reinforced concrete  !

[ '

l structures will'be-designedLusing the Ultimate Strength 0 "c -Design '(USD)' method. ,

n%+ y

$'.f ai Under normal loading conditions a ' minimum factor of- ,

4' f -

safety- _will be provided - for all structures as shown below:

~

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I

,"+

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.). i \'

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Overturning:'  !

1.50 Sliding: 1.50 Buoyancy 1.25 *

. I Minimum factor of safety for buoyancy under design flood conditions will be 1.1 (SRP 3.8.5).

Design characteristics assumed for the various materials used are stated in Section 4.3.3 " Construction Materials".-

i 4.3.'2.2 Safety Related Structures ,

l

1. Seismic Design  ;

i

a. General The building will be modeled=.as a three dimensional finite element lumped mass model.

The soil will be represented by six spring j elements. The computer program STARDYNE will '

.be used for modal integration to'obtain floor

. response, acceleration time histories and subsequent generation of. the floor response accelerct'.on spectra. . The spectral accelerut. ion will be used for the design of the' 4 floor slabs.and the procurement of equipment based -on their design classification.- .The modal responses obtained from the spectral analysis-will be combined-in accordance with 'l

.. the- Regulatory Guide- l'. 9 2 .- All. three components _ of seismic ' accelerations,. two horizontal and 'one. vertical con ponent,- will be'

-considered to act' simultaneously. The spatial  ;

components will be ' combined by the Square Root'-

of' Sum.of Squares'(SRSS). method.

b. Design: Input Response Spectra

'A i

' Input horizontal.and vertical seismic spectra. O P ,

for the seismic ' design Lof the -D5/D6 Building :

, o will be based on the Regulatory Guide 1.60sRev.( )

, 1 ," July: 1981 spectra for a maximum ground acceleration: '(zero . : period acceleration) of

• O'.06g. for the Operating Basis Earthquake .(OBE) and 0.12g for s the- Safe Shutdown Earthquake

[

( S S E ) -'.

These zero period acceleration' values are in l compliance with the PI Nuclear Generating Plant Final Safety Analysis' Report.

38

'w NSP*D6 : 66 i

r_

.a -

( r 9 f

c. Time Histories Acceleration time histories for the three directions of motion (two horizontal and one vertical) will be developed using the reverse shock spectrum feature (DYNRE 7) of the STARDYNE MICRO computer program. These time histories will be developed independently for the three directions using randomly generated input . values by iteratively adjusting the frequency content so as to match .the resulting response spectrum with the design response

[. , spectrum for a chosen damping value. Comparison L of the resulting spectra for various damping values with the corresponding OBE input design response spectra curves will be done to ensure acceptability of the final time histories.

- The requirement of SRP 3.7.1 for the enveloping criteria will be satisfied. Nn separate SSE time histories . will ' be developed. The OBE response spectra values will be doubled to obtain corresponding SSE values.

These time histories will- be used as input

• notion for.the mathematical model to generate

. response apectra for all floors,

d. Critical Damping-Values

, The percentage of critical damping values for-

= ^ .the OBE-and SSE levels used in the analyses-will be--in accordance with~ Reg. Guide 1.61,

+ '

. October 1973.- These values:will-be used for x

seismic qualification of equipment and systems.

, The values for material and radiation damping within-the soil medium:'will - be. taken as' lo percent of~

g critical . damping for .'the . translational (3 W~ directions), rocking and torsional motions.of the:

.-building-structure. :These values will be the same

'for both OBE and SSE leve's.

k e.. Soil-Structure Interaction-E

[ 1

' Soil-structure interaction will be accounted for in the . seismic--analyses through.the use' of.

j".. soil springe representing ~the six degrees of u-

~ freedom n

-(t'ree translations .and three-rotations) od the rigid foundation mat.. Soil-I Spring constents will be' computed using the formulas c'? e. in " Design Procedures for NSP=D60 F' l

n,,

-1 Dynamically Loaded Foundations" by R.V. Whitman and F.E. Richart, Jrurnal of the Soil Mechanics and Foundations Division, ASCE, November,1967. '

Material properties used in these forn.ulas will be taken from the John A. Blume & Associates Report # JAB-PS-02 which provided the basis for the original seismic design for Prairie Island.

The set of six springs will be placed at the mass center of the foundation slab. The ground motion time histories will be applied directly at the. base of the foundation slab.

l

f. Interaction with Existing Structures The DS/D6 Building and its foundation are physically separated from the existing plant structures. The gap filled with compressible material between the DS/D6 Building and the

, adjacent 1 structures will be sized to avoid a contact of the two structures for the maximum out-of-phase motions. ,

j g. Mathematical Model f

1 The dynamic model will consist of several

" sticks" representing the shear walls with  !

nodes at each floor level. Each of these nodes'

~

t will be connected'by rigid link, representing

, .the rigid diaphragm action of the= floor' slab.  ;

The shear areasiand moments of inertia of the-e,

' concrete walls.between floors will be used to ,

calculate the stif fness characteristics of the.

elements between nodes of the-individual wall d " stick!' .

~

f '

The foundation slab will te treated as'a rigid Lf ,

' member for in-plane,and out-of-plane motions.  !

V/ 3 ~

I n - o r d e r. t o' incorporate the effect of thel i

actual floor . slab stiffness on the vertical-4 J 6 response spectra, vertical spring mass systems  :

• will'be attached, at-the center of mass of each -  !'

/! '

floor to represent the . vertical. flexibility of fe ,

the slab at that , elevation a - The ' slab mass ,

fo along with the equipment!1oads._will represent the mass of the' spring-mass system. .This will:

IF4(i "

L be done by solving the problem twice, once with the lowest flexibility of<the slab and second I + with the highest flexibility. This will f'

usp.oi 68 t; -

lt '

,s.

st '

provide an enveloping spectrum. Composite behavior of the concrete slab and steel beams will be considered in the computation of the spring constants, where appropriate.

h. Spectral Peak Broadening The spectral accelerations obtained from the STARDYNE program will be smoothed and its peak will be broadened (115%) in accordance with the requirements of Regulatory Guide 1.122, Rev. 1.

2. Tornado' Winds Structures will be analyzed for stresses due to

. tornado and misslle loads. Stresses due to tornado loading will La combined with stresses due to dead loads and operatinq loads to.obtain total stress.

Maximum stresses will be limited to those specified in Section 4.3.6.

3 '. Design for Missiles

, , . iles shot ; i Table 4-B will be considered for

.:_gn.

Y All' tornado generated missiles will be~ assumed to

, impact end on at 90 degrees-to the surface being impacted and all areas of Safety Related structures t

exposed ;to either - falling: or horizontally flying.

ctornado. missiles will'be. investigated.

In accordance with S R P . 3 . 5'. 3 , Local' Damage of Barriers ' :(Penetration, _Spalling: . and Scabbing

L Effects) and their overall1 response is investigated.

-Where:elasto-plastic behavioriof steel barriers is

.f. . relied upon,' a maximum ductility ratio of 20 is, used.

m 4.- Flood Protection m'

The ; Diesel Generator Building L Structure .will' be.

protected against the probable: maximum flood at an'

"$ elevation of 703 ' 7". The base slab and the exterior-4* walls. will. be ' designed to resist .the full' t ,

hydrostatic ~ head of the probable E maximum f1 cod.

~

.Except for . the ' exit . doors, all . openings to the

• ' exterior wall.will be above elevation 705'0". All mat and exterior wall construction joints below N$P+D6 69-1 s.

~j p

iL

o 1

elevation 705'0" will have water stops. Exit door

. openings through the exterior walls will be protected by adequately sealed bulkhead closures.

4.3.2.3 Non-Safety Related Structures Structures in this class are designed for the conditions  !

of loading specified in Section 4.3.4.2 and in accordance I with the design. methods and allowable stresses specified l in the codes. Stresses are combined as before and reviewed to assure that they are within-limits. .i 1

j; 4.3.3 ' Construction Materials n The principal construction materials.for Safety Related i structures are

concrete, reinforcing steel and  !

structural steel.

Concrete. design compressive strength will be as follows:

- All structures 4000 psi l

Mud slab and-concrete fall 2000 psi Reinforcing steel will 'be deformed billet steel, conforming.to ASTM Designation A-615, grade 60.,

Structural' steel will conform to-ASTM designation A-36

.or/A-572 Grade 50.

x.

4.3.4 Load Combinations Y The following loads and loading combinations will be .used

--in the: design and analysis. -

[y ,

4.3.'.4.l Safety Related Structures

, Safety related structures will- be' analyzed for the 3

- followingiconditions.cf-loading: I

~

1.. . Load Combinations for Concrete' Structures ,(Ref. SRP 3'.8.4)-

"1 For concrete = structures - .using: ultimate strength. 4'

,% design method, the

load combinations will be in

(- accordance with the following: i

, :For r.ormal/ service load ' conditions, the - following, load combinations will.be considered:

(1) 1.4 D t l'.7 L v' -(2) 1.4 D + 1.7 L.+ 1.9 E (3). 1. 4 D + 1. 7 L + 1. 7 W j.,. , . NSP 06: 70 1 F 1 f de** # ' , ,

r fh r d

.'4

. Where thermal stresses due to T. and R. are present, the following combinations shall be considered:

(4) (0.75) (1. 4 D + 1. 7 L + 1. 7T. + 1. 7 R.)

(0.75) (1.4D + 1. 7 L. + 1.9E + 1. 7 "'. +

(5)

1. 7R.) 1 (6) (0.75) ( 1. 4 D + 1. 7 L + 1. 7W + 1. 7T. + 1. 7 R.)

In a d d i t i o n ,. t h e following combinations will be considered:

(7) 1.2 D + 1.9 E  !

(8) 1.2'D + 1.7 W For_ factorod load conditions which represent extreme - -l environmental, '

abnormal, abnormal / severe environmental, and abnormal / extreme environmental conditions, the following load combinations will'be considered.

D + L + T. + E '

(9)

-(10) D + h + ~ T. + R. + W, (11) D + L + T. + lt + 1. 5 P.

(12 ) . D + L + T. + R. + 1. 2 5 P. + 1.0 ( Y, + Y, '+ 1

.-Y.) + 1.25 E i (13) D - + L + - T. + R. + 1. 0 P. + 1.0 ( Y, + Y, +

Y.) ~ + 1. 0E '

. In ? combinations (11) , (12 ) , and- (13) , the maximum _

values o f : - P. , T., R.,- Y,,.Y., and Y., including an

, appropriate dynamic load factor will be used unless-I a time-history analysis is. performed to justify-otherwice.- Combinations (30) and:(12) and-(13) and .

. the: corresponding structural acceptance criteria- of Section .4.3.6 will-~be satisfied first -without the tornado _ missileiload in (10) and without Y,, J Y,, and JY_in - ( 12 ) - and- (13)..' .When .considering. these-

-x ' -

' concentrated loads local section strength capacities

. .may ~be exceeded provided ' there is no loss ,of

, function of any. safety-related system.

. Where:any; load-reduces the effects of other loads, V

~, the corresponding coef ficient. for that load.will" be taken as 0.9 if it can be demonstrated.that' the load ' "

+

m.

s is ~ always _ present or occurs ' simultaneously ' with '

wis .

other loads. Otherwise the coef ficient for that load - .

t

,' i ' will:beLtaken'asLa zero.

o

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-,s.  ; -

3

m

. l q.; y, i

. Load Combinations for Steel Structures (Ref. SRP 2.

3. 8. 4 )'- l For steel interior- structures using clastic working l stress design methods, the load combinations will -l be in accordance with the following:

For normal / service load conditions, the following load' conditions will be considered:

(1) D+L (2) D+h+E (3) D+L+W '

If' thermal stresses due to T. and R. are present, the following combinations will be also considered: '

(4)' D + L + T. _ + R.

g.; (5) D + b + T. + R. + E R (6) D + L + T. + R. + W For ~ factored load conditions _ the following load

combinations will be considered

(7) D + h + T. + R. ' + E '

(8) : D + E + T. + R. + . W.

(9) - D + L + T.a + R. + P.

. (10) D + L + T. + R. + P. + 1. 0 ( 7, Y, + Y.) +

E

' ( 11) . _ D . + L + T. + R. + P. + 1. 0 ( Y, + . Y, + Y.) +

'E' .

In the J above -- f actored toad. combinations, . thermal ~

loads can-be selected.when it can be shown that they are. secondary and self-limiting _in nature and:where -;

g; 6 the' material is' ductile. ,3

, , . In ' combinations (9), -(10) , - and ( 11 ) ', the maximum -i M '

values of- P.,: T. , R., Y,,LY. and Y. ,- . including. an 'j appropriate dynamic load factor will be used unless; i

. .f , , a Ltime-historyi analysis . is performed to _ justify;  ;

otherwise. . Combinations - (8) , f(10) and (11) and the  !

.; ,4

~ corresponding ; structural acceptance criteria' of L, ~

Section 4.3.6 will'first be' satisfied'without the '

.[ tornado missile load in' (8) and without Y,, Y,, and. i OL ,.

Y. l ins (10) and (11) . When'considering these Nl concentrated 5 loads,- local:.section strength may be:

exceeded provided there will be no loss of function

l of any_ safety-related system.

r

' N$P = 06 ' 72 f tl  ?

i f

m. /c k j

,b ,M ,,. ,m, , .

.._ __ ___________9

5

-Where any load reduces the effects of other loads, the corresponding coefficient for that load will be taken as-0.9, if it-can be demonstrated that the-load is always present or occurs simultaneou-ly with other loads. Otherwise, the coefficient for that load will-be taken as-zero.

~

q Where the structural effect of differential settlement-may be significant, it shall be included

.with the dead load, D.

4.3.4.2 Non-Safety Related Structures

! Non-safety related structures will be designed for the greater of the following two combinations of loads:

1. Dead, Live and Environmental loads (wind or snow) or

- 2.- Dead, Live and Uniform Building Code Earthquake

, loads specified in Section 4.3.1.8 which for the

.g Prairie Island site is 0.05g_(Ref. USAR Sec. 12)

S -4.3.5 Desiern and Analysis Procedures if The design: and analysis procedures utilized for l structures,; including assumptions on boundary conditions

and expected behavior under loads, will be in accordance-with-the.following:

a. . For safety related- concrete structures, . the.

procedures will' be;in accordance with ACI 349-85,

,"Code Requirements for- Nuclear Safety Related Structures",

b., For non-safety - related concrete structures,- the

. procedures will be in accordance with either ACI.

L 349-85 or ACI 318-83.

c. For e, teel f structures, the procedures .will be in=

accordance with the AISC Specification, eighth-s edition.

4 ; 3. 6' Structural Accentance Criteria (Ref. SRP 3.8.4) 4 '

For; each of. the - loading . combinations delineated in section 4.3.4.1-of this criteria, the fcllowing' defines o '

the allowable limits which constitute' the structural--

W acceptance criteria:

b s

- N$P?C61 73 f

i L

5

• 1r

'5

a. In combinations for Concrete Limit All Load Combinations U

. b .' In Combinations for Steel Limit Load-Combinations (1), (2), (3) S Load' Combinations (4), (5), (6) 1.5 S Load Combinations (7), (8), (9) 1.6 S*

Load Combinations (10), (11) 1.7 S*'

Notes i

S For structural steel, S is the required section strength based on elastic design methods and the allowable stresses defined in Part 1 of the AISC-

" Specification for the Design, Fabrication, and .'

Erection'of Structural Steel for Buildings"

. The 1/3 inccease in allowable stresses for steel due  ;

to seismic or wind loadings is not permitted.

.U For concrete structures, U is:the section strength-required to resist- design loads based on the strength design methods described in AC.I 349 Cod 6.

• - For- these two combinations, in computing :the- 1 required section. strength, S, the plastic section

, modulus of steel shapes, except for those which do.

L not meet the AISC criteria!for compact sections, may beused.

4.3.7, Structural / Architectural Fire Protection Recui' _nenty 4

-4.3.'7.'.' Separation Barriers- '

1

_escl: Generators'will be separated from each,other-and 4 l ' rhe-remainder of the? plant by. reinforced concrete walls' having a fire rating of at-least13-hours. In' light of L its proximity to the Turbine Building and4 Auxiliary P

. Building,.the east wall and a' portion-of the north wall ,

e

'are also 3-hour fire' rated. All penetrations in' fire' walls will :be 3-hour . fire rated. Leach redundant j

electrical train will be separated by 3-hour rated fire- 'l Larriers.i The : pipe trench running- through both fire areas on; the grade level will be separated from the s*

7,.[

H"i remainder of- the building area by a 3-hour rated barrier.

l Fire barriers are listed in Table 4-C. Fire doors of-Q' equivalent' rating will be provided in' fire walls.-

4 NSP.Db- 74 e ,

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l Y 4.3.7.2 Fire Area Boundaries and Penetrations yc cable,and' cable tray penetrations as well as pisn g and 'j ventilation duct penetrations through. fire area. ,

boundaries, will be sealed with a penetration seul having 1

1. a-3-hour fire rating. Adequacy of these seal designs  !

will be demonstrated by fire tests conducted in accordance with ASTM E-119.

si . ~The diesel fuel oil day. tank and the lube oil storage

. tank room are each contained ~in a separate room L constructed of reinforced concrete with 3-hour fire rated .

~

walls, floor and ceiling. Room' doors and fire dampers in ventilation. ducts are fire rated for 3-hours. All-penetrations through the . room boundaries that are fire area boundaries are sealed with-three hour penetration ,

~

seals. Floor drains and curbs are provided for each room

. which discharge.into the building sump pit. l

. In : -high intensity fire areas, all structural steel

+ forming a part of or supporting a fire barrier wall or (

slab Dwill be coated with fire proofing material to

. provide - a fire rating ~ equal' or . greater than the' fire

• barrier.

' 4 . 3,8. Buildina' Exterior Openinas '

'All building-exterior openings except exit doors will.be

' ,  ; protected- f rom ; . access by access-controlled. Security.

1. , ' Devicas . - These openingsiwill be protected from tornado'. .

1  : generated missiles. All openings that serve as. inlet or n'

outletEfor HVAC' Systems, will be provided with screens

, to preclude entry.of birds, leaves and other debris..

y? ,

r 4.4 BUILDING ELECTRICAL DESIGN'

.g "4 . 4 .1' '

,Lichtina- i

+

g i4.4'.1.1 . System: Functions.

h

,, j - Lighting for the new DS/D6 ' Building. is' provided by .two -

La , ,a:

systems.

/h ' l' . . Normal. Lighting System. Function o .[q' This- system will provide general and . local ~

Ll s '

.111umination, for- operating. and maintenance-

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2.

Emergenti Lighting System Function This lighting will provide protection of personnel and allow continued safe plant operation in the I event of normal. lighting failure. It will consist of fixed self-contained battery pack lighting.

Fixed self-contained lighting with individual 8-hour minimum battery power supplies will be provided in

' areas that must be manned for safe shutdown (in the i j

event of a fire) and for access and egress routes. '

to these areas.

4.4.1.2 System Design

1. General System

- The type of fixture and foot candle requirements for L the various areas of the new Building will be as.

m required by NFPA 70 and in accordance with the guidelines of the Illuminating Engineering Society (IES) Handbook.

Conduit for. lighting systems will.be run. embedded y , and' exposed, and grounded. '

Separated conduit system' will be provided for the 277Vi.120V and emergency lighting circuits.

All' lighting fixtures.are to be pendant-or surface s mounted.-

Lighting wire insulatio'n will be type XHHW, rated I s

< 90 C.

Separate L neutrals will be run with each phase of i g y branch circuits. .A common neutral will be run with

" each .' 3-phase: feeder circuit. Full-size ' neutrals will-be used for. feeder and branch circuits.

- The combined voltage drop of both feeder and-branch  ?

circuits will not exceed 5%..

, LLighting wires will: be labeled as. to panel and

circuit.

x  ;

7 2. Normal Lighting-System

. Normal lighting. fixtures wl'll be 277V fluorescent,

.HP sodium or metal halide end 120V incandescent.

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Ib Fixtures will be switched from the lighting panclboard, using molded case circuit breakers rated for switching duty.

The normal lighting panels will be 480/277V, 3-phase, 4-wire fed from a new normal MCC in the new

- diesel building.

3. Emergency Lighting and Exit Signs System Emergency lighting will be incandescent and provided

' ith self-contained 8-hour rated battery packs.

Exit lights will be incandescent and provided with L self-contained 8-hour rated batterv packs.

2 4.4.2 P_qW.cr Distribution and Loadg 4.4.2.1 System Function The power distribution system will provide electrical

+~

energy to all non-Class 1E building loads, including lighting systems, communication, security and fire detection systems, convenience outlets and miscellaneous building equipment.

Normal (non-safeguards) 480 VAC electrical power to serve building loads will be obtained from normal 480V motor control conters. The building normal power distribution system will consist of motor control centers, r transformers, distribution panels and associated cable and raceway systems.

Saf oguards 480 VAC electrical power will be obtained from new safeguards motor control conters and 480V switchgear in the D5/ 76 Building for the safety-related HVAC systems h..J diesel generator support systems. This portion of

{ the power distribution system will be Class lE.

4.4.2.2 System Design Electrical power distribution will be accomplished by means of a 480 VAC, 3-phase, 4-wire, solidly grounded system. Transformations from this service to 120 and

__ 208 V AC will be provided by panel boards mounted in x motor control centers.

E Electrical supply equipment will have the capacity to supply the power requirements of al' identified and t anticipated loads plus a minimum of 20% spare capacity for future loads.

kSP-06 77 E

M i-

1 m

.j All components-of the power distribution system will be  ;

rated for.600V AC and be suitable for application in a typical industrial environment. NEMA Class 12 enclosures s

will be provided as a minimum.

The non-safety building electrical power distribution system will beLelectrically and physically independent I from al'1 safety-related systems. Segregation will also be provided between different voltage classes.

'1

, Non-Class 1E circuit for lighting, communication, fire detection and security systems are routed in totally l

,, . enclosed-raceway and cable for these systems need not i

. comply with IEEE 383. The remaining non-Class 1E .

. circuits will use fire resistant cable which has passed L -the . fire tests contained in IEEE 383 on UL VW-1 and is Class 1E qualified cable.

Overcurrent protection will be provided by means of molded-case thermal-magnetic circuit breakers. Proper coordination of:all overcurrent protection devices will' be provided down to (and including)-local panelboard(s),

in:accordance with IEEE Std. 242-1975.

Transformers, disconnect switches, lighting panels, u receptacle 1 panels and receptacles will be surface or .

. floor mounted. i

& The receptacle l panels will be 120/208V, three-phase, four Y vire stepped down from a 480-120/208V transformer. 1 Power receptacles will be 120V AC, duplex with no covers, d 79

• f except,that in the diesel pit, radiator room, air inlet-a i room:and generator room -weather proof covers will be S used.

W , LWelding receptacles (minimum of 4 ) will -be, 480V, 3- ,

L,

. phase,' : 4' wire.

y

!? 4!4.3 GroJmding

.y Th'e : electrical' power distribution system will be solidly  ?

,m ' grounded to the existing Station ground network.- ,

l,3 7 Li , # Load equipment,. power supplies, raceways, and enclosures 4

!. 3 will be electrically intercnnnected and form a continuous-y path to' Station ground. In hidition, all load. equipment

.q[b i will

be grounded by means of a separate ground conductor l W, routed with the circuit conductors.

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4.4.4 ( y Jun tions I l

4.4.4.1 System Function j Tr.io' system will provide dependable, convenient and rapid -

communication - between all plant areas vital to the .I operation and maintenance of the plant and the protection of personnel. The existing communications system will be extended to the new diesel generator building.

, ;4.4.4.2- System' Design The; communications system will consist of:

Telephone system installed. by an independent telephone con,ractor, s

Page/Public Address System (Gai-tronics)

A visual signaling device will be provided in the

, diesel- engine rooms to indicate plant alarm actuation. Flashing lights. in the noisy areas (Diesel Engine Rooms) will supplement the PA system in these areas.

Maintenance-(sound powered) system.

-4.4.5' Fire Detection k .,

W 4 '.' 4 .' 5 . l' System: Function .

Thistsystem:will detect and. alarm in. case of fire. The

• 7 , '

detection, devices - will be' appropriate to the - specific  ?

.arealand the. type of fire anticipated. All detection' T 4-  ; equipment:will alarm on the. fire detection panel in the t main control' room.  ;

4' -only one'alarn will be sent-to'the Main Control Room,for the entire Diesel Generator Building. The fire detection -

ifs '

t panel 'will. beJ1ocated on the turbine building ' side of the

• m '  : north wallsof the. stairway. There will be no connection' -

'between theLHVAC system'nand'the fire . alarm - system. No 4 7 HVAC. smoke control system will be provided. Manual pull [

L stations;will..be provided.at'the main' exits, r "s' J4i 4.5.2- System Design i s Fire detectors for the . diesel ' generator will . be heat _ l

, detectors'that will be single zoned- and wired to activate:

,; , a pre-action sprinkler system for each diesel. All'other rooms'in the diesel building-'will.have smoke detectors ,

Y,. insta11ed. >

w '

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oj

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g. . . -. _ _ -

5 t All- fire alarm wiring will be supervised. A single zone will' be provided in-the control room for the entire building.

I The fire alarm and pre-action control panel will be located on the turbine side of the north diesel generator

. wall. Electrical power will be supplied by an existing non-safeguards 120V AC UPS source.

Manual fire alarm pull stations will'be located at the

- main' exits.

4.4.6- Security security for.the new DS/D6 Building is provided by three systems.

1. Building Security System i The building security system will provide protection

-from unauthorized access into the building. The l security ~ system will have the capability to monitor, l alarm, store data and generate reports pertinent to '

personnel. access / egress into the' building. This

. system will function during normal plant operation Land durliig loss' cf off-site power but 'is .not T required to operate ffollowing- a: dasign basis accident or safe shutdown earthquake. 3 The. building security system will consist-of card y readersbelectric door. strikes, position: switches, i '

security lighting and" cables to interface with.the t

, existing ' plant security. systemi Normal entrance / exit doors will be monitored and controlled; '

g ', -

iby the' plant security computer. . operation of

/!~

R . ,

emergency exit doors will be monitored and alarmed.

l, '

%  : 2 .- Security Lighting System  :

eV , The building's external' lighting system will' satisfy; jM ,

the plant security illumination ? requirements. in  :

r

.accordancetwith the Prairie-Island Security; Plan. j f

3. SecurityJFence~Sy' stem 1 hy" '

, Thec:new; DS/D6 Building and Fuel Oil Storage. Vault l Qf,' willL:be located entirely' within the existing A protected area security fence. 'During construction, b.

f; W a: temporary 1 construction guardhouse located at the

southwest ' corner of the existing protected area .

fM w;

. security fonce-will be utilized. I s f-: ,

nP;D6 ' 80-i s

k l };. ,.('

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- 4% . .

4.4.7 Radiation Monitorina s

Three area radiation monitors will- be located in the D5/D6 Building. Each monitor alarm will be an input to the existing area radiation monitoring panels in the Control Rod- Drive Rooms and the Emergency Response p Computer System.

l' 4.5 BUILDING - MECHANICAL /HVAC DESIGN 4'.5.1 Fire Protection Desian An automatic pre-action- fire suppression system will ,

protect the diesel engine rooms. The fuel oil tank day '

tank and lube oil tank rooms will have wet pipe automatic sprinkler systems. Other areas will be protected with standpipe hose stations and hand-held extinguishers as L,

required by NFPA 10 Portable Fire Extinguishers. The p

fire suppression system piping will be. supplied from a new bulk-main from the Turbine Building Firc Protection loop.

The following. areas will be pr,vided with automatic fire suppression

• in compliance with NFPA, ANI and- NRC: ,.

requirements.

• k[ 'l.- DS and D6 Diesel Generator Rooms I

2. Fuel Oil Day Tank Rooms 3.- ' Lube Oil Storage-Tank Rooms "

-4. -Outdoor Fuel Oil Receiving Tank  ;

The diesel Egonerator rooms . will each ,have a sing'le '

, interlocked pre-action' sprinkler system. ' Activation of the? ' system will' be by a -single - zone heat detection circuit that is wired?into-theulocal firecalarm. control snel.: Output'from the. panel will be:24V.DC to the fire ,

a 'actoctors!' The sprinkler riser willibe separate from the.

standpipe) station riser.

Three' new feed mains and indicating isolation valves will'

'be:added"to the existing. Turbine Building'10-inch fire.

protection ' loop; one to supply. the station system

stand;lpe riser; one to supply the preaction and wet pipe- d bi systems;- and one to supply the . deluge . system. . This f "E

^

arrangement provides flexibility. for removing individual ~

systems from. service for' maintenance. q

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l. Preaction Sprinkler System i 1

An automatic preaction fusible-link sprinkler system will be provided for each emergency diesel ,

generator. The preaction valve will be tripped by  ;

a single zoned heat detection circuit. Piping will 1 be supervised by air pressure with trouble signals annunciated at the local fire alarm control panel I and the fire alarm control panel in the control room.

2. Wet-Pipe Sprinkler S;r etem Each Fuel Oil Day Tank Room and Lube Oil Room will be provided with an automatic wet pipe sprinkler system that will have its flow alarm wired into the fire alarm system.

4 3 . Deluge System The Fuel Oil Receiving Tank will'be protected by an automatic ; deluge ' system tripped by- a . single zoned

. heat detection circuit. ,

4. Hose Stations 1

. y 1-1/2: inch hose stations with proper length of fire' hose with-fog-nozzles will be provided to'i protect

<all' areas on each olevation. ,,

y . ,

=

7 15. .

Fire Extinguishers-- '

j 1  ;

c: '

Dry. chemical or. carbon' dioxide fire extinguishers

- :will be provided to' protect-all-areas'of the Diesel q

[ Generator Building' depending on the specific hazard.

o +

6( Additional' Valves,,', Sprinkler LSystems and ' Hose 9

7 Stations- .

5 Additional! valves'off the' standpipe risers ~will'be' provided. : for elevations .with ' no sprinklers 1 : for 1

future expansion iflnecessary. ,

, , s Sprinkler systems and hose stations will be provided' e 1.

• , f ,

with separate risersssuch that. primary or- secondary protection will always be available, y#

j it ,

Hose stations in electrical: equipment areas intended for electrical fires will be: equipped with low flow fog' nozzles.

' !]..i

' Sprinklers in. stairways are not required by NFPA and

"[

,. y will not be provided in the D5/D6, Building.

~

N$P 06 82 7

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f (;i. hi Ji HQ' ? ' >

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V A fire suppression system is not required for the Fuel Oil Storage Tank Vault per code.

4.5.2- Elumbiac/ Drains g ~ 4.5.2.1 System Function Demineralized water hose stations for washdown in mechanical equipment areas will be furnished. Lavatories will not be-provided due to the temporary habitation-of this structure.

The building will be provided with convenient floor k T drains to route all. normal drains and oily waste spills to two separate sumps in each diesel generator room. The sumps will be sized to contain the maximum quantity of oily: waste spills corresponding to the capacity of the j single largest system and will be sized to accommodate credible water pipe breaks. Portable sump pumps will be-used for transfer of oil spills or water collected in the d sumps.

-4.5;2.'2: System Design N Plumbing system drain piping will be desigrad to meet the .American Water Works Association (AWWA) and other 1, appropriate. building codes --and industrial standards, consistent ' with existing Prairie Island plant systems.

Service water for the hose stations will be provided from a tie' to the' Unit '2 Turbine Building. Potable water y_A '

piping for . future battery room eyewashes will also be s,

from a iUnit 2 . tie-in. > A waste ' discharge line will

[ connect to'the Unit 21 Turbine Building waste system which 4l: Y

~

will' route to.the plant' hold-up pond. Roof' drain piping and draln piping in

the diesel generator radiator exhaust

.r open area will connect to-the cooling water return line J o in-tho' main,pla.nt. All other general. area drain piping

. 1 will run- to the DS/D6 ' Building sump in the engine room b A L

• pit: area, except floor; drains in the lube oil tank rooms and the fuel day tank rooms. Floor drains in the lubeL p oil tank, room-and tho fuel olliday tank rooms.will run-K ,

to thei dirty oil ' tank located ~ in the respective D5/D6

'f Building engine room pit area..

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'ov-erflow piping from the, dirty oil tanks.will run to the D5/D6 ? Building ' oil sump; located in the engine room pit

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.. The buildir g sumps are located in the diesel engine pit .

areas. A portable sump pump will be used to. transfer oil q from.the sumps to barrels for removal. The sumps will i

, - be provided with level switches to alarm high liquid l level condition in the D5/D6 control room, with a common l trouble alarm in the main control room. l Fire protection water released due to a system actuation will be drained to the building' sumps.

t!;

4.5.3 'Heatino. Ventilation, and Jir Conditionina (HVAC)

-4.5.3.1- System Funi _ ;n l

~

-The~DS/D6 Building HVAC System will provide heating and

.'( -ventilation and will provide for removal of electrical

" equipment- heat loads to maintain equipment within qualification ' limits and operating limits during all p plant- operating conditions. It will also provide sufficient -air flow to prevent build-up of unwanted' gases.

The D5/D6. Building HVAC. system will be comprised of the {

following. subsystems for'each diesel generator train:-

m.

, o Lube 011 Storage Tank and Fuel Oil Day Tank Rooms Exhaust' System o Battery Room Heating, Cooling, and -Ventilation R

.SystemD(Future) o <

Emergency; Equipment Switchgear > reas Ventilation L System f.

?

o: DieselLGenerator ControlL Roomiand-Switchgear Area

, o Auxiliary Cooling System o . Local' Electric Unit He'aters The. HVAC . system ' controls will . consist' ' of -temperattre 0',, sensors' . temperature switches, controllers cand dampar by control drives to control air flows in order to maintein'

, required temperatures;'in~ .the, building .Fa'ns - will be. .'

3g operated.by.: control switches-with, interlocks with their corresponding-: dampers and temperature sensors.' operating -

~

' temperatures will' be monitored 0and' alarmed 9 t ,x  :{

Wj,f kk Ductwork, wall, ceiling and floor, openings will be 7 fD provided ~ to allow the later - additionf of: a Datte.ry Room.

Heating, Cooling,.andfVentilation. System.

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, i x 4.5.3.2 System Design 5 The HVAC ~ system capacities are based on an . outdoor ambient temperature range of 96'F and -20*F. . This is the u4- 99% occurrence range from ASHRAE. The HVAC steady state

. heat loadLealculaticas do not take credit for passive -

heat sinks (concrete walls and floors) and thermal lag.

@hs Therefore, the HVAC design conditions r.re conservative, and brief upper temperature excursions up to 100*F for a

. few hours will not significantly affect electrical Q equipment' operability.

Ttsa vertical benchboard and control panels in the diesel "

.m generator control- room must be maintained during all plant: operating conditions at a temperature less than

• u

'[ 104*F. The HVAC system will be designed to maintain

component operating temperatures. To simplify the D5/D6

Building HVAC system, a- single common forced-air W ventilation system will be provided to meet the equipment heat removal and fresh air ventilation needs of. all areas 4 serving each diesel generator train.  !

1. Tank Rooms '

i

/. The Diesel Lube Oil Storage Tank Rooms-and Fuel Oil o ~ Day Tank Rooms each have a minimum . ventilation requirement'of 1 cfm per square f. cot of floor brea

'[> (minimum ~150 ofm) on a year round. basis in order to J cf '

,, 7 l

. ' prevent possible build-up of a -t'lammable atmosphere <

+

!/ (NFPA30). '

.2. 'Make-Up Air-  ;

The make-up' air. for the Diesel' Lube Oil Storage Tank

, -Rooms and Fuel Oil Day Tank. Rooms'will be from the M,

'h common building . ventilation--supply headers. The maximum indoo:6 ambient temperature'will-be limited l to be 12 0'F.o ' The - minimum ,temperatureL will be n

, f limited to 50'F. 4 1 a

[{m ,

~3. ' Exhaust' Air  :

fJ f All exhaust air flows will be discharged. to , the j.90 i outside atmosphere. ';

%..,f 3 4. Contr . Room & Electrical Equipment Ventilation

. u, l i

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The incoming air supplied by the main vent to the d' 3 control room and electrical areas will be rough filtered, a ,,

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The safety related ventilation system for the D5/D6 Control Room and electrical equipment areas will be designed to limit ambient critical room temperatures to 104'F without supplemental cooling. Outside air will be supplied to the area by one normally operating vane axial fan _with an installed, operator selectable back-up fan provided. Provisions for mixing outside air with recirculated air will be made to limit the minimum supply air temperattire to 5 0'F . The supply air will'be filtered by a roughing filter.

The Control Rooms and 480V switchgear areas will each be provided with a direct expansion type mechanical cooling system for non-safety related auxiliary cooling to maintain ambient temperatures '

l- below the maximum normal limit of 104 *F during summer months. Each cooling system will consist of ,

an outdoor compressor / condenser unit, a room-mounted evaporator / fan unit to circulate. room air, and the interconnecting Freon-12 tubing, control equipment and power supply. Fresh air will be provided to the rooms from the common ventilation system independent ll l of thic system.

1 L 5. Temperature Control

& Temperature control will be accomplished by modulating dampers in the air supply ducts in response to signals from room temperature sensors and controllers. Class'1E power for safety related

, instruments will be obtained from existing plant Class 1E 120V AC UPS-distribution system. Non-1E power. for non-safety related- instrumentation - will be obtained from existing plant 120V AC UPS

distribution system. High room temperature will be

' alarmed in the Diesel Generator control room, with a common trouble alarm in the main control room.

6. HVAC Capacities i Capacities of individual system ventilation fans and all other components-will be indicated on design drawings or specifications.

7. HVAC' Electrical Equipment All safety related electrical equipment for the Diesel Generator Building HVAC Systems will be powered from engineered safety features buses.

Nsp 06 86

8. Heating System The heating system will be designed to maintain spaces at a minimum temperature of 50'F.

9. Ventilation and Exhaust Fans D5/D6 Building supply and exhaust fans will be vene axial type with direct-drive TEAO motors. Two 100%

capacity supply fans and two.100% capacity exhaust fans per train will be provided.

Fan developed pressures will be based on pressure drop through ductwork ar.t ductwork accessories.

All system components and materials will be similar to those previously utilized in industry and have demonstrated their reliability.

All equipment will be factory inspected and tested in accordance with the applicable equipment specification. System ductwork and erection of equipment will be inspected in accordance with the design drawings and manufacturer's recommendation.

System testing and balancing will be performed and evaluated prior to system turnover. Controls on each system will be checked, adjusted and tested to ensure the proper sequence of operations. A final, integrated pre-operational test will'be conducted-with all equipment and controls to verify system operation.

10. HVAC Missile Protection

<11 components of each ventilation system will be

,_ c.otected from tornado generated missiles.. The L building ventilation intakes and exhausts will be missile protected.-

1

'11. Fire Protection Fire dampers of 3-hour fire rating will be provided in all . openings penetrating 3-hour fire rated walls / floors / ceilings. No connection exists between the HVAC system and the fire alarm system. An HVAC E smoke control system is not' provided. Operator action is required to shut-down the HVAC system when necessary during a-fire.

o 1.

NSP D6 87

12. HVAC Intake and Exhaust Elevation The intake and exhaust openings for the Emergency D5/D6 Building Ventilation System will be located at an elevation higher than the maximum probable

1. 1ood level.

Intake openings will be located at an elevation sufficiently below the turbine building and diesel generator exhausts to prevent exhaust gas recirculation intake.

13. Fail Safe System The HVAC dampers will fail to a safe position (i.e. ,

.~

a position which permits flow to safety related areas) on loss of normal / safeguards AC Power.

L 4.5.4 Station Air Reauirements Station air for maintenance needs will be provided for the new building, serving non-safety related - functions only. The supply of air will be from a connection to the Unit 2 station air system operating normally at 95 psig.

Suitable maintenance hose stations will be provided where required in the new building.

4.6 DESIGN STANDARDS The following NUREG 0800, IEEE Standards, and Regulatory Guides are adopted in whole as design criteria requirements for the D5 and D6 Building as described in Section 4.

Within the existing plant boundary the existing design criteria -as defined in the USAR will apply except as noted otherwise in this document.

4.6.1- NUREG/CR 0660 Enhancement of On-site Emeraency Diesel-Gene.rator Reliability 4.6.2 NUREG 0800 Standard Review Plan (SRP)

SRP 3.3.1 Rev. 2, 7/81 Wind Loadings SRP 3.3.2 Rev. 2, 7/61 Tornado Loadings SRP 3.4.1 Rev. 2, 7 f 31' Flood. Protection SRP 3.5.1.1 Rev. 2, 7/b1 Internally Generated Missiles (outside containment)

= SRP 3.5.1.3 Rev. 2, 7.81 Turbine Missiles (protection against turbine missiles per USAR 6.1.2.3 and 12.2.1)

NSP 06 OO

m. ..mmumi . --.---a m ,,

\

j SRP.3.5.1.4 Rev. 2, 7/81 Missile Generated by National Phenomena SRP 3.5.3 Rev. 1, 7/81 Barrier Design Procedures SRP 3.6.1 Rev. 1, 7/81 Plant Design for Protection Against Postulated Piping ,

Failures in Fluid Systems '

Outside Containment SRP 3.7.1 Rev. 1, 7/81 Seismic Design Parameters SRP 3.7.2 Rev. 1, 7/81 Seismic System Analysis l SRP 3.8.4 Rev. 1, 7/81 Other Seismic Category I 1 Structures SRP 3.8.5 Rev. 1, 7/81 Foundations SRP 3.10 Rev. 2, 7/81 Seismic & Dynamic Qualification of Mechanical & Electrical l Equipment 4.6.3 IEEE Standarde IEEE 279-1971- Criteria for ' Protection Systems for Nuclear Power Generating Stations l

IEEE 308-1974 Criteria for Class IE Electric Systems for Nuclear Power Generating Stations IEEE 323-1974 Standard for Qualifying Class 1E Equipment '

for Nuclear Power Generating Stations (Note: IEEE 323 is invoked as a guideline

" document to provide a basis for 'the determination of qualified life of i equipment. it is not intended to be invoked as a basis for environmental qualification. 10 CFR 50.49 requirements which are met by methods described in RG 1.89 (endorsing IEEE 323)' do not apply to

- the mild environment of the new D5/D6 Building.

IEEE 338-1977 Standard Criteria for the Periodic Testing of Nuclear Power Generating Station Safety Systems IEEE 344-1987. Guide for Seismic Qualification of Class I Electrical Equipment for Nuclear Power Generating. Stations (Note: Seismic qualification for the D5/D6 Diesel Generator, HVAC duct damper, . damper.

actuators, and the Class 1E Motor Control Centers cites the 1975 revision. Refer to documentation for details.)

NSP D6 89

1 IEEE 379-1972 Guide for the Application of the Single Failure Criterion to Nuclear Power Generating Station Protection Systems IEEE 384-1981 Criteria for Separation of Class IE Equipment and Circuits (see note under Regulatory Guide 1.75)

(Note 1: The 1981 revision !_ specified because it addresses comments contained in Regulatory Guide 1.75, Rev. 2 on the 1974 revision of the standard.)

(Note 2: The identification requirements of IEEE 384 for tagging intervals of cable, cable tray and raceway may not be strictly followed. Guidance provided by the USAR will be adhered to as l

introduction of a different set of

j. requirements would ba confusing.

4.6.4 Reculations and Reaulatory Guides n

10 CFR 50, -Licensing of Production and Utilization, Facilities, including all appendices.

Occupational Safety and Health Administration (OSHA),

Department- of Labor, " Occupational Safety and Health i Standards", Title 29- Labor.

Regulatory Guide 1.6, Rev. 3, 03/71 Independence Between Redundant Standby (On-site) Power L Sources and Between Their Distribution Systems e Regulatory Guide 1.29, Rev. 3, 9/77 L Seismic. Design Classification -

u Regulatory-Guide 1.32, Rev. 2, 2/77 L Criteria for Class 1E Electric Systems for Nuclear Power 1 Generating Stations

[ Regulatory Guide 1.38, Rev. 2, 5/77 1 Quality Assurance for Packaging, Shipping, Receiving, Storage and Handling of Items for Water-Cooled. Nuclear Power Plants i

1 li_

NSP=D6 90 i

L1

r.

Regulatory Guide 1.53, 6/73 Application of the Single Failure Criteria to Nuclear Power Plant Protection Systems Regulatory Guide 1.59, Rev. 2, 8/77, ERRATA 7/30/80 Design Basis Floods for Nuclear Power Plants (Design Basis flood per USAR Section 2.4.5)

Regulatory Guide 1.60, Rev. 1, 12/73 Design Response Spectra for Seismic Design of Nuclear Power Plants Regulatory Guide 1.61, 10/73 Damping Values for Seismic Design of Nuclear Power Plants Regulatory 1.75, Rev. 2, 9/78 Physical Independence of Electric Systems (Note 1: Separation criteria of RG 1.75 and IEEE 384 will be met within the new diesel generator structure.

As a minimum, requirements of the USAR will be met for new equipment design within the existing plant.)

. (Note ~ 2: For regulatory position C.10, cables will be

' marked at 10. foot intervals, rather than the 5 foot interval specified, in conformance with USAR Section 8.7.5 which has been found to be sufficient to ensure proper. cable installation.)

' Regulatory Guide 1.76, 4/74 i Design Basis: Tornado for Nuclear Power Plants Regulatory Guide 1.92, Rev. 1, 2/76 Combining Modal Responses and Spatial Components - in Seismic Response Analysis ,

Regulatory Guide 1.100, Rev. 2, 6/88 i

-Seismic Qualification of Electric Equipment 1for Nuclear ,

Power Plants i Regulatory Guide 1.102, Rev. 1, 9/76

. Flood Protection (Flood Protection per USAR Section 2.5) p Regulatory Guide 1.115, Rev. 1, 7/77 Protection Against Low-Trajectory Turbine Missiles (Protection Against Low-Trajectory Turbine Missiles per-USAR' Sections 6.1.2.3 and 12.2.1)

Regulatory Guide 1.117, Rev. 1, 4/78 l Tornado Design Classification Regulatory Guide-1.118, Rev. 2, 6/78 Periodic Testing of Electric Power and Protection Systems NSP 06 91

' Regulatory Guide 1.122, Rev. 1, 2/78 Development of Floor Design Response Spectra for Design of Floor-Supported Equipment or Components Regulatory Guide 1.132, Rev. 1, 3/79 Site Investigations ' for Foundations of Nuclear Power Plants (Site Investigation per USAR Sections 2.5 & 2.6)

Regulatory Guide 1.137,-Rev. 1, 10/79 i Fuel Oil Systems for Standby Diesel Generator j l

Regulatory Guide 1.138, 4/78 Laboratory Investigations of Soils for Engineering l l

Analysis and Design-of Nuclear Power Plants (Laboratory Investigation of Soils per USAR Sections 2.5 and 2.6)

Regulatory Guide 1.142, Rev. 1, 10/81 Safety-Related Concrete Structures for Nuclear Power Plants (other than Reactor Vessels and Containment)

Regulatory Guide 5.65 L; Vital Area Access Controls, Protection of' Physical Security Equipment, and Key.and Lock Controls-4.6.5 NFPA Standards i NFPA 10-1988 National Fire Protection Association Standard for Portable Fire Extinguishers l

l NFPA 33-1989 National Fire ' Protection Association Standard for Sprinkler Systems i NFPA 14-1986 National Fire Protection Association Standard for the Installation of Standpipe and Hose Systems NFPA 30-1987- National Fire- Protection Associhtion l Standard for.FJammable Liquids NFPA 72A-1987 National Fire Protection Association Standard fer Signaling Systems, Local-Protective l?

NFFA 72D-1986 National Fire Protection Association Standard for . Signaling Systems, Proprietary Protective NFPA 72E-1987 National Fire Protection Association Standard for Fire Detectors NSP D6 92

.i

NFPA 255-1984 National Fire Protection Association Standard Methods of Fire Tests of Building Construction & Materials 4.6.6 ANSI Standards ANSI A58.1-82 American National Standard Institute Code Requirements for Minimum Design l Loads in Buildings and Other Structures ANSI B31.1-1967 American National Standard Code for Power Piping ANSI N45.2-1971 Quality Assurance Requirements -for Nuclear Power Plants 4.6.7 Buildina Codes AISI Anerican Iron and Steel Institute

" Specification for the Design of Light Gage Cold-Formed Steel Structural Members" 1980 Edition Minnesota Building Code (1985)

AWS D1.1 ~American Welding Society, " Structural Welding code"

, ACI 318-83 American Concrete Institute " Building Code Requirements for Reinforced Concrete" i L ACI 349-85 -American Concrete Institute " Code Requirements for' Nuclear Safety Related Concrete Structures" l

l ANSI /AWWA- American Water Works Association, "AWWA l- ' Standard for Welded Steel Tanks for Water Storage" l ASTM 1merican Society for Testing and Materials Applicable standards for .the various ,

construction materials specified in !

l Project specifications.

ASCE ASCE Paper No. 3269, " Wind Forces on Structure", Transactions of the American Society of Civil Engineers, Volume 126, Part II (1961)-

API 650 Welded Steel Tanks for Oil Storage (Seventh Edition)

NSP.D6 93 5

i UBC International- Conference of Building Officials, " Uniform Building Code" (1988 Edition)

AISC American Institute of Steel Construction

" Specification for the Design, Fabrication

-and Erection of Structural Steel for Buildings," Eighth Edition.

i UL-555-73 Standard for Fire Dampers 4.6.8 Northern States Dower Standards s

Prairie Island - Updated Safety Analysis Report Prairie-Island - Final Safety Analysis Report Prairie Island Technical Specifications Section 3.4 NSP Underground Storage Tank-Policy Compliance Guide, October 3, 1989. (Exception: Fuel Inventory Management System not provided).

Prairie Island Operations Manual Section H7, Specification.for the Analysis of Piping Systems Prairie Island Operations Manual Section Hil, Electrical Construction Standards Prairio Island Security Plan ,

4.6.9 Other Documents L SER-NRCEFire Protection Safety Evaluation Report, Sept.

1979 ASHRAE Handbook 4.6.10 Quality Assurance Proaram All safety related design, procurement and construction activities performed for the SBO/ESU Program by Northern States Power and Its - suppliers 'will be performed in accordance with an approved Quality Assurance Program that meets 10 CFR,: Part 50, Appendix B and Section.2-

- through 19 of ANSI N45.2-1971- and specified supplementary program requirements.

L ii ,

L j

N$P 06 94 1

i l

l-

TABLE 4-A

, (Ref. Reg.. Guide 1.61)

DAMPING FACTORS (Percent of Critical Damping) operating Basis

,, Earthquake or 1/2 Safe Safe Shutdown Structure or Comoonent Shutdown Earthcuake* Earthcuake Equipment and large- 2 3 diameter piping systems, piping diameter greater than 12 in.**

Small-diameter piping- 1 2 l systems, diameter l equal to or less.than l 12 in.

I Welded steel structures 2 4 )

Bolted steel structures 4 7 Prestressed concrete 2 5 structures-Reinforced' concrete 4 7 E structures'

• - .In the dynamic ' analysis of active' components as defined -in Regulatory Guide -1.48, these. values should also be used for SSE.

,**- LIncludes both material and structural damping. If the piping system- consists of only cne or two spans with little structural damping, use values for cmall-diameter piping.

l p

l L

NSP 06

TABLE 4-B (Ref. SRP 3.5.3)

TORNADO GENERATED MISSILES Mass Velocity

• Missiles Dimension (meters) (Kilocrams) (Meters /Sec)

Wood Plank 0.092 x 0.289 x 3.66 52 83 6-inch Schedule 40 pipe 0.168 Diameter x 4.58 130 52 1-inch Steel Rod 0.0254 Diameter x 0.915 4 51 Utility Pole 0.343 Diameter x 10.68 510 55 12-inch Schedule 40 pipe 0.32 Diameter x 4.58 340 47

. Automobile 5 x 2 x 1.3 1810 59

' Velocities are horizontal velocities. For vertical velocities,.70 percent of the horizontal velocities shall be used.

1 7.-

9 WSP 06

TABLE 4-C a+

El?tE BARRIERS 3 HOUR FIRE 3 HOUR FIRE 3 HOUR FIRE 2 HOUR FIRE RATED WALLS PATED CEILING RATED FLOOR RATED WALLS Pace 1 of a Elevation 6958 South Wall D5 x North Wall D6 x East Wall Diesel Bldg. x Turbine & Diesel Bldg.-Wall x Stairway South, West Walls x North, East Walls x Elevation 707' West Wall x North Wall- x East Wall x

South Wall D5 x North Wall D6 x Stairway t North,-East Walls x South, West Walls x Eliyation 718' 4

South Wall D5 x North Wall D6 x Day Tank D5 North, East, x West Walls Floor. x-Ceiling- x Day Tank D6 South, East, x West Walls Floor x Ceiling x Diesel Bldg. x East Wall Turbine-Diesel x Bldg. North Wall Stairway-North, East Walls x South, West Walls x

'NSP D6

TABLE 4-C FIRE BARRIERS 3 HOUR FIRS 3 DOUR FIRE 3 HOUR FIRE 2 HOUR FIRE RATED WALLS RATED CEILING RATED FLOOR RATED WALLS Elevation 735' North Wall D6 x south Wall D5 x Lube Oil Tenk D6 North, East, x West Walls Floor x Ceiling x Stairway North,-East Wall x South, West Walls x Diesel Bldg. East x Wall Turbine-Diesel Bldg. x .

Nor'ch Wall L

l l'

i.,

i 1

I 1

NSP'D6

FIGURE 4-1  ;

Figure 4-1: Arrangement of New D5/06 Building and CSTS 21 and 22 L

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5.0 DIESEL GENERATOR INTERFACE AND ELECTRICAL JAFEGUARDS UPGRADE The Plant Interface and Electrics 1 Safeguards Upgrade '

scope includes the following:

o Electrical tie-in of the D5 and D6 Diesel Generators to the existing plant safety related auxiliary power systems, o Modification of the voltage restoration, load rejection and load restoration schemes for Unit 1 ,

and Unit 2.

o Electrical tie-in of the 05/D6 system to the existing plant Emergency Response Computer System.

o Improvement in voltage support, principally at the  ;

480V level, in' Units 1 and 2.

o Replacement of two existing 480V safeguards buses in Units 1 and 2. ,-

o Provide alternate feeds to 480V safeguards buses in Units 1 and 2.

o Improve circuit coordination by eliminating subfed "

480V MCC's on safeguards 480V buses.

o Provide additional 480V safeguards buses and 4.16kV >

switchgear capacity for future loads, Units 1 and 2.

o Provide safeguards 4160V sources to the 121 Cooling Water Pump.

o Replacement of 4.16kV Safeguards Buses in Unit 2 and expansion of Unit 1 4.16kV buses. ,

o- Replacement of Main Control Room "G" Panel. The existing-pane 1'contains controls and indicators for the existing D1 and D2 diesel generators and-  ;

safeguard electrical system. The new panel will be '

unitized and contain controls and indicators for D1, D2, D5 and D6 diesel generators and the safeguards'

, electrical system, Unit 1 and Unit 2.

95

5.1 SEISMIC DESIGli CLASSIFICATI0!i All safety related electrical systems and components provided in the Plant Interface and Electrical Safeguards Upgrade scope 'will be designed to withstand a Safe Shutdown Earthquake (SSE) and remain functional (Seismic Category I per R.G. 1.29). Seismic qualifications shall be per IEEE 344 and Regulatory Guide 1.100. All non-safety related systems and components and their supporting systems will be designed to ensure that the SSE would not cause their structural failure resulting in damage to safety related systems or components and adversely affect their ability to perform the safety related function. ,

5.2 SAFETY DESIGli CLASSITICATIO!1

• The.following electrical power distribution systems and the associated control circuits provided in the Plant ,

Interface and Electrical Safeguards Upgrade scope are classified as safety related electrical (Class 1E).

1. 4160V safeguards switchgear buses 15, 16, 25, 26, and 27.

2. 480V safeguards switchgear buses lil, 112, 121, 122, 211, 212, 221 and 222. l

3. 4kV and-480V loads connected to the switchgear and buses listed above.

4. 4160V alternate power source to each bus listed aboVe.

'5. Voltage restoration, load rejection,- . load restoration equipment and circuitry, including the new Unit 2 load sequencer cabinets.

6. Main Control Room "G" Panel. ,

'The following systems are classified as non-safety-

-related.

1. 4160V sources from transformers CT11, CT12,.2RY and I 1R-Y winding up to the breaker connection at safeguards switchgear 15, 16, 25 and 26.

1 L' 2. The Emergency Response Computcr System (ERCS).

L

3. Annunciator circuits to Main Control Room.

L L <

l 96 i

5.3 UPGRADED SAFEGUARDS AUXILIARY AC POWER SYSTEM DESIGN 5.3.1 General Descrietion Figures 2-1 and 2-2 illustrates the existing and upgraded )

4160V Safeguards Auxiliary AC Power Systems, respectively.

I The planned modification will provide two dedicated emergency diesel generators for each unit; D1 and D2 are dedicated to Unit 1, and D5 and D6 are dedicated to Unit l

2. These diesel generators will be independent of the other unit's electrical support systems, and will be capable of being connected manually to the other unit's associated safogsards bus using two bus tie circuit breakers. No at.:matic closure of the bus tie breakers will be provided. Each diesel generator will be capable of supplying the required SBO shutdown loads for either unit.

5.3.2 Preferred. Alternate. and Standby Power Source

, confinuration Three separate power sources consisting of preferred and alternate of fsite sources and standby onsite sources will be provided to each of the plant's 4160 safeguards buses.

1. Startup Transformers (Preferred or Alternate) Source Startup Transformer 1R, Y-Winding provides power to Unit 1 Buses 15 and 16 and Startup Transformer 2RY provides power to Buses 25 and 26.

2. Cooling Tower Transformers (Preferred or Alternate)

Cooling Tower Area Transformer CT11 will provide power to Unit 1 Bus 15 in addition to currently providing power to Bus 16. Transformer CT12 will continue to provide power to Bus 26 and in addition, will provide power to Bus 25.

Normally, one safeguard bus per unit will be connected to a startup transformer source and the other safeguards bus will be connected to a cooling tower transformer source.

3. Standby Source If the Startup Transformers and the Cooling. Tower Area Transformors should fail, standby power is provided by onsite safety related diesel generators.

97 l

This configuration provides two independent offsite sources to each 4160V AC Safeguards Bus without relying on the bus tie-breakers between units within separation criteria divisions (i.e., Unit 1-Train A to Unit 2-Train A, etc.). These bus tie-breakers would be used only during Station Blackout (for access to alternate AC (AAC) source) and other similar circumstances.

5.3.3 4160V Confiauration - Safeauards Buses The Unit 2 4160V safeguards switchgear will be replaced and located in the new Class I D5/D6 Building. This will be accomplished using two new 4160V safeguard switchgear line-ups. The present Unit 2 4160V safeguard loads will be reconnected to the new switchgear. The new Unit 2 switchgear will include space for future growth.

Portions of the present Unit 2 4160V safeguards switchgear will become Unit 1 safeguards switchgear by means of a bus interconnection after the new Unit 2 switchgear has been installed. The resulting Unit 1 4160V safeguards switchgear will have space for future growth. '

A new 4160V safeguards switchgear line-up Bus 27, will be installed in the DS/D6 Building and will be capable of being supplied from either Unit 2 4160V switchgear train A or B. This line-up will be the safeguard source for 121 Cooling Water Pump.

5.3.4 480V Conficuration - Safeauards Buses Tour new Un .t 2 480V safeguard buses (two per train) will i

be installed in the new DS/D6 Building to replace the two existing buses. The present Unit 2 safeguard loads will be reconnected to these new 480V buses. The reconnected loads (safeguard McCs) will be divided between the buses of a given train.

The existing Unit 1480V safeguard buses will be replaced

-and two additional 480V safeguard buses will be added.

The additional buses will be located in the present Unit 2 4160V switchgear rooms after the existing 4160V switchgear has been removed. The resulting Unit 1 configuration, two buses per train, will be similar to Unit 2. The present Unit 1 safeguard MCC loads will be divided between the buses of a given train.

Alternate power sources from the same train of the opposite unit, to be used primarily for maintenance outages on. 4160V buses, will be added to the 480V safeguard buses. Each alternate source line-up will 98

consist of an incoming line compartment, and a 4160-480V transformer section, one alternate source line-up per train will be provided for use by either or both 4807 safeguards buses. Loading on the alternate source transformer will be administrative 1y controlled withi:

ratings.

Voltage regulators will be added to each 480V safeguards '

bus in Unit 1 and Unit 2 (subject to equipment availability). This will improve the voltage at each 480V safeguards load.

The new 480V safegur.rd configuration will accomplish the following goals:

o Increase capacity for future growth.

o Provide additional circuit breakers to allow improved MCC feeder circuit coordination, by eliminating subfed 480V MCCs from safeguards 480V '

buses. ,

o. Provide dual feeders (main and alternate sources) to the Screenhouse MCCs 1AB1 and 1AB2 through transfer switches.

• o Improve voltage regulation at the 480V level.

o Provide alternate feeds to all 480V safeguards buses.

o Reroute cable to reduce wrapping (fire barrier) and its resulting cable ampacity derating.

o Replace the original Siemens switchgear with new Class 1E equipment.

L

l. 5.3.5 Voltace Restoration / Load Reiection/ Load Restoration Upon loss of bus voltage or a sustained degraded bus voltage condition on the 4.16kV Safeguards Buses in Units 1 and 2, a sequence of events take place to restore proper voltage to the safeguards loads. These events include automatic starting of the Emergency Diesel Generators, automatic load shedding and a subsequent reloading using the preferred or standby power sources.

The control scheme that will initiate and control these events will be a new load sequencer system in Unit 2 and the existing system in Unit 1.

99

5.3.6 Emeraency Response ComDuter System The Emergency Responso Computer System (EROS) will serve as an aid to the control room operator in monitoring the status of the D5 and D6 diesel generators. It may replicate some functicns of the engine monitoring system, local control panels or the hard-wi"ed control room instrumentation. Instead, it will only monitor specific inputs and provide data to fulfill a specific need for the operator. Areas identified to date include:

o Annunciator system support to identify, on demand, a specific input that generated a group alarm.

o Operations data logging of surveillance testing events.

Provide analog process information of parameters o

occasionally required.

5.3.7 DS/D6 Control Scheme Tie-In with Existina Plant When the local Generatcr Control Mode switches, located in the D5 and D6 Co': trol Rooms, are in the ren.ote position, control of the D5 and D6 emergency diccal generators is transferred to the Main Control Room.

Emergency start, manual start and stop, voltage adjust, speed control, main breaker control and synchronizing are among the controls that will be available in the Main Control Room.

The design of the control circuitry between the D5 and D6 Control Rooms and the Main Control Room will include the intermediate termination of all control cables at terminal cabinets located in the Relsy Room and then circuit continuation to the Main Contral Room. "

l The D5 and D6 tie-in to the existing plant will also include all appropriate alarm circuits to tt.* annunciator cabinets.

5.3.8 Main Control Room "G" Panel Modification The existing controls for the safeguards dierel generators and their associated 4160V buses located on the Main Control Room "G" Panel will be replaced and additional controls for the new diecal generatorr will be installed. The existing panel will be repir.ced and smaller' controls will be installed to accommedate the additional controls in the original space. Ar.nunciator j alarms ~for the new diesel generator will be installed concurrently with the "G" panel work.

100

1 i

This werk will be done during the 1992 Unit 2 Refueling Outage. Current construction plans are to also have a short Unit 1 outage during this panel work. All required panel controls will be moved to a temporary pane) during this two-unit outage and then transferred back to the original panel after it is replaced. This method will minimize the use of temporary panels and the risks involved with electrical construction work on safeguards equipment.

5.3.9 Detailed Desi UD 5.3.9.1 General Requirements The Plant Interface scope can be divided into two parts.

The part that involves the existing plant components and systems and the part that involves new plant components and systems.

The design, which will modify the existing plant, shall power maintain or improve the present safeguard distribution system reliability and availability.

Throughout this criteria, any design that affects existing plant components or systems and any design that adds new components or systems within the existing plant will be in conformance with the USAR as a minimum.

5.3.9.2 Cable and Raceway Separation 5.3.9.2.1 General Requirements o Cable and raceway separation and segregation within the. DS/D6 Building will conform to the requirements of IEEE 384 as modified by NRC Regulatory Guide 1.75.

o Cable and raceway interconnections between D5/D6-Building and existing plant facilities including all duct runs and other raceway systems, as well as all cables and raceways routed within existing plant facilities will be separated and segregated in accordance with the requirements contained in USAR Section 8.7 as a minimum, o Cable and wire used to interconnect equipment will be certified by the manufacturer as passing an approved flame test per IEEE 383. This requirement does not apply to wire internal to f actory assembled devices or pieces of equipment (such as the internal wiring of a computer display terminal) . Custon assembled equipment (such as control boards or 101

switchgear assemblies) will be specified with flame resistant viring which meets the intent of IEEE 383.

5.3.9.2.2 Specific Requirements -

D5/D6 Building and Fuel 011 Storage Area o Safety related cables will be segregated into two distinct redundant safety divisions designated Train A and Train .B , which include Emergency Diesel Generator D5 and D6, respectively.

o Redundant safety train cables will be routed in areas separated from one another by three hour fire barriers.

o cables and raceways associated with Train A will be located in separate fire areas or cubicles from those with Train B.

o Cables designated as non-safety related will be segregated from the safety related cables by routing them in raceways which only contained non-safety related cables.

o Separation between safety related raceways and non-safety related raceways will conform to the requirements in IEEE 384 Section 6.1.8 for fire hazard areas (diesel rooms including diesel control rooms, fuel oil day tank room, luce oil day tank room, and fuel oil storage area).

o separation between the safety related raceways and non-safety related raceways will conform to the requirements in IEEE 384 Section 6.1.4 for limited hazard areas (building electrical equipment rooms) .

o Safety related cables will be separated from non-safety related cables within equipment' enclosures located in both fire hazard and limited hazard areas in accordance with the requirements in I2EE 384 Section 6.6. Cables will be separated by at least i

six inches, or one train of cables will be enclosed in metal raceway, or the safety and non- afety i cables will be separated by a barrier with a minimum l one-inch separation between cables and the barrier, l except in the immediate vicinity of isolation device I

terminals.

102

t 5.3.9.2.3 Specific Requirements - Existing Plant Areas o Safety related cables will be segregated into two distinct safety divisions commensurate with the present plant design, as a minimum.

o New Non-safety related cables will be separated and segregated from the safety related cables by routing in separate raceways, o Cable tray separation between redundant divisions will conform with USAR Section 8.7.2, as a minimum.

Separation between conduits of redundant divisions, and between safety related and non-safety related conduits, will be a minimum of one inch.

o Cable separation within control panels between redundant divisions, or between safety and non-safety related cables will conform with USAR Section 8.7.7.

o Cables associated with safe shutdown circuits as identified in the Prairie Island Fire Hazards Analysis will be separated or protected in accordance with the requirements contained in USAR Section 8.7.4.

o Cables associated with redundant safe shutdown circuits will be routed through separate fire zones as defined in the Fire Hazards Analysis if at all possible. If routing redundant cables in the same fire zone is unavoidable, then the redundant cables will be physically separated from one another per 10 CFR 50 Appendix R, Section III.G. If the i

physical separation distances specified in 10 CFR L 50 Appendix R,Section III.G are unattainable, or

! if there are intervening combustibles, then one of l the division cables and raceways will be enclosed in an approved fire barrier protective material l which has a one-hour rating for fire zones with I

suppression systems and a three-hour rating for fire zones without a suppression system.

5.3.9.2.4 Specific Requirements - 121 Cooling Water Pump

- o Power cables associated with Bus 2 '/ and the 121 L Cooling water pump will be treated as a separate cable division and will be separated from all other Train A and B cables in accordance with the requirements contained in Section 5.3.9.2.2 and 5.3.9.2.3 above.

l 103

5.3.9.3 Safeguards AC Auxiliary Power System

1. The new Unit 2 safeguard raitchgear Buses 25 and 26 shall consist of indoor air magnetic medium voltage metal clad assemblies which have a nominal voltage rating of 5000V, 2000A continuous main bus, 350MVA rating and 50kA interrupting capacity. Each switchgear lineup shall contain the following breakers:

3-2000A for diesel generator and offsite source supplies 3-1200A for transformer feeders j 9-1200A for existing and future motor feeders 2-1200A for bus tie and Bus 27 feeder

2. The new safeguard switchgear Bus 27 will have the same rating and shall contain 2-1200A motor feeders. .

3. A portion of existing Unit 2 4160V safeguard switchgear will be used to expand the number of 4

breakers in the existing Unit 1 Safeguard Switchgear 15 and 16. The additional circuit breakers will be used for:

Bus 15 addition - 2 iature feeder breakers

- 1 feeder breaker Bus 16 addition - 2 feeder breakers 1 future feeder breaker

4. The eight new Unit 1 and Unit 2 480V safeguard buses will consist of 600V rated indoor low voltage switchgear assemblies each having a 1000/1333kVA dry type transformer,1000 kVA voltage regulator, 2000A main bus, 30kA instantaneous and 22kA delay trip interrupting capacity, 2000A main breaker, 600A manually operated and 600A electrically operated feeder breakers and future compartments. The breaker interrupting capacity will exceed the maximum fault duty from a 3-phase bolted fault at the breaker load terminals.

5.3.9.4 Voltage Restoration / Load Rejection / Load ".estoration <

Unit 2 will have a new control scheme to initiate diesel generator start, load shedding and sequential load restoration. The undervoltage protection scheme will be revised per Branch Technical Position PSB-1. The logic l

104

l and timing functions will be based on a programmable controller to be located in the DS/D6 Building.

The interfacing devices between the controller and the field equipment will be relays. The power supply to the controller will be Class 1E, 120V AC UpS from the existing plant system.

Unit 3 will continue to use the existing control scheme consisting of discrete relay logic. The logic will be modified to accommodate the dedication of Emergency Diesel Generators D1/D2 to Unit 1.

5.3.9.5 Electrical Cable Requirements Class 1E circuit design will comply with the gereral requirement given below.

1. No distinction between existing plant and new plant will be made regarding cable purchases. Therefore, all Class 1E insulated Sable shall be qualified in accordance with IEEE 383 a nd Regulatory Guide 1.131.

2. Only copper conductor will Le used. >

3. New power, control, and instrumentation cable insulation will be ethylene propylene rubber (EPR) or cross-linked polyethylene (XLPE). Cable jacket material will be chlorosulfonated polyethylene (CSPE). Neoprene and PVC materials will not be used in insulation or jacket materials. Switchboard wire will be flame resistant SIS type or equivalent.

5.3.9.6 Cable Tray and Conduit .7squirements Tray and conduit systems will comply with the general requirements listed below:

1. Exposed rigid galvanized steel conduit and embedded intermediate metallic tubing will be used throughout the plant where the use of aluminum trays is not practical.

2. Instrument cables will not share raceways with power, control, or communication cables.

3.- Class 1E raceway (those raceways containing safety-related circuits) will be supported with Seismic category I supports.

105

i

4. Existing plant cable trays and raceways to which new circuits are added will have their supports analyzed to verify continued acceptability.

S. The design will ensure that Class lE, Seismic Category I systems and components are not prevented from performing their safety related functions by seismically induced physical interaction with non- l safety related non-seismic Category I systems or components. Supports for non-safety related items will be designed and installed such that their supports do not fail under seismic conditions and l' endanger the operation of any adjacent safety-related items. This interaction will be identified as Seismic II/I. i l

Seismic II/I supports will not fail during an SSE to the degree that they degrade, to an unacceptable ,

level, the ability of Class lE systems to perform I their required function.

New installations in the existing plant will be evaluated to identify potential Seismic II/I Concerns.

Certain non-Scismic Category I components whose weight and configuration are such tha+, even if their support failed, the nature and force of their impact would not prevent Class 1E components from performing their safety-relater. function may be excluded by analysis from seismic II/I considerations.

6. Protection of Class 1E tray and conduit from ,

potential pipe break failure hazards, missile hazards, hot pipe concerns, and seismic interaction 4 of . closely . spaced components will be provided by barriers, restraints, separation distance, orientation, or the appropriate combination thereof.

5;3.9.7 Cable and Cable Tray. Coding The identifying code to be used on the electrical design drawings, the cable tray system and the cable will be as presented _in Attachment 5-A. Color codes and markings i will be in accordance with USAR Section 8.7.5.

5.4' DESIGN STANDARDS For new plant components and systems the Class 1E system design will comply with the following standards.

106

5.4.1 NUREG 0800 Standard Review Plan (SRP)

SRP 8.1 Rev. 2, 7/81 General Requirements SRP 8.3.1 Rev. 2, 7/81 On-Site AC Power Systems BTP PSB-2, Rev. O, 7/81 Criteria For Alarms And Indication Associated With Diesel-Generator Unit Bypassed And Inoperable Status BTP ICSB-2, Rev. 2, 7/81 Guidance for Application of Regulatory Guide 1.47 5.4.2 IEEE Standards IEEE 279-1971 Criteria for Protection Systems for Nuclear Power Generating Stations IEEE 308-1974 Criteria for Class 1E Electric Systems for Nuclear Power Generating Stations IEEE 323-1974 Standard for Qualifying Class 1E Equipment for Nuclear- Power Generating Stations (Note: IEEE 323 is invoked as a guideline document to provide a basis for the determination of qualified life of equipment. It is not intended to be invoked as a basis' for environ-mental qualification. 10 ;

1 CFR 50.49 requirements I which are met by methods described in RG1.89 (endorsing IEEE 323) do not apply to the mild environ-ment of the new D5/D6 l Building).

IEEE 338-1977 IEEE Standard Criteria for the Periodic Testing of Nuclear Power l Generating Station Safety Systems IEEE 344-1987 Guide for Seismic Qualification of Class 1 Electrical Equipment for Nuclear Power Generating Stations 107

(Nnte: Seismic qualification for the D5/D6 Diesel Generator, HVAC duct dampers, damper actuators, and the Class IE Motor control Centers cites the 1975 revision. Refer to documentation for details.)

IEEE 379-1972 Guide for the Application of the Single Failure Criterion to Nuclear ,

Power Genernting Station Protection  !

Systems l i

IEEE 383-1974 IEEE Standard for Type Test of Class 1E Electric Cables, Field Splices, and Connections for Nuclear Power i Generating stations. )

IEEE 384-1981 Criteria for Separation of Class 1E '

Equipment and Circuits (Note 1: The 1981 revision is specified because it addresses comments contained in Regulatory Guide 1.75, Rev. 2 on the 1974 re'<ision of the standard. )

(Note 2: The identification requirements of IEEE 384 for tagging intervals of cable, cable tray and raceway may not be strictly f ollowed.

Guidance provided by the USAR will be adhered to as introduction of a different set of requirements would be confusing.

IEEE 387-1975 Diesel-Generator Units as Standby Power Supplies (Note: Certain provisions of the 1984 revision of the standard are included in the DS/D6 Diesel Generator specification because they provide guidance for issues. not fully addressed in the 1975 revision which was referenced in Regulatory Guide 1.9, Rev. 2. These provisions include Appendix A guidance for development of a load profile, Appendix B for the format to define diesel generator service conditions, and Table B-2 format for use in defining those components with less than a 40 year operating life.

108 1

5.4.3 Reculatory Guides Regulatory Guide 1.6, Rev. O, 3/10/71 Independence Between Redundant Standby (Onsite)

Power Sources and Between Their Distribution Systems Regulatory Guide 1.9, Rev. 2, 12/79 Selection, Design and Qualification of Diesel Generator Units Used as Standby (Onsite) Electric Power Systems at Nuclear Power Plants Regulatory Guide 1.29, Rev. 3, 9/78 Seismic Design Classification Regulatory Guide 1.131, Rev. O, 8/77 Qualification Tests of Electric Cables, Field Splices, and Connections for Light-Water-Cooled Nuclear Power Plants Regulatory Guide 1.32, Rev. 2, 2/77 Criteria for Class 1E Electric Power Systems for Nuclear Power Generating Stations Regulatory Guide 1.47, 5/73 Bypassed and Inoperable Status Indication for Nuclear Power Plant Safety Systems Regulatory Guide 1.53, 6/73 Application of the Single Failure Criteria to Nuclear Power Plant Protection System Regulatory Guide, 1.62, 10/73 Manual Initiation of Protective Actions Reguratory Guide 1.75, Rev. 2, 9/78 Physical Independence of Electrical Systems (Note: For regulatory position C.10, cables will be marked at 10 foot inte rvals , rather than the 5 foot interval specified, in conformance with USAR Section 8.7.5 which has been found to be sufficient to ensure proper cable installation.)

Regulatory Guide 1.81, Rev., 1, 1/75 Shared Emergency and Shutdown Electric Systems for Multi-Unit Nuclear Power Plants (Note: For regulatory position C.3, the onsite emergency a.c. electrical system for each unit will be reparate and independent, but the capability to interconnect the emergency (safeguards) 4kV a.c. buses within separation criteria divisions (i.e. , Unit 1-Train A to Unit 2-Train 109

A, etc.) w311 be retained for use during Station Blackout (access to alternate AC (ACC) source) and other similar circumstances.)

Regulatory Gu1Go 1.100, Rev. 2, 6/88 Seismj- Qual!.fication of Electrical and Mechanical  ;

Equipment for Nuclear Power Plants '

Regulatory Guide 1.108, Rev. 1, 8/77 Periodic Testing of Diesel Generator Units Used as Onsite Electrical Power Systems at Nucleer Power Plants Regulatory Guide 1.118, Rev. 2, 6/78 ,

Periodic Testing of Electric Power and Protection System 5.4.4 Northern States Power Standards Prairie Island - Updated Safety Analysis Report Prairie Island - Final Safety Analysis Report Prairie Island Technical Specifications Prairie Island Operations Manual Section Hil, Electrical Construction Standards i Prairie Island Security Plan 5.4.5 No distinction between existing plant and new plant shall be made regarding electrical equipment purchases, therefore, all Plant Interface secpe Class IE equipment will be qualified for service in nuclear power generating stations in accordance with IEEE 344 and Regulatory Guide 1.100. Switchgear assemblics and circuit breakers chall be designed and torted in accordance with applicable U.S. ,

industry standards, NEMA SG-3 and 5 and ANSI C37. '

5.4.6 Relevant structural requirements such as seismic loading shall be as contained in the Installation Design Criteria  ;

in Section 3.0. '

i 1 I 110 t

ATTACHMENT 5-A ELECTRICAL CABLE AND CABLE TRAY CODING PAGE 1 OF 5 1.0 CABLE TRAY CODING:

1.1 Each tray section of the cable tray system shall have an identifying code indicated on the electrical design drawings and this same identification shall be stencilled on the tray after it is installed.

Stencil 11ng shall be applied at each straight section of tray 're the identifying code changes.

Any tray that 1: continuous thru walls or floors shall have the identifying code stencilled on both sides of the wall or floor.

1.2 The identifying code shall be based on the following system:

Examnle:

1 I_Q - L

• I h h L dL

-- Numerical sequence Safeguard and Reactor Protection Designations only See coding listing Paragraph 1.4. -

L - Ladder (Power)

T - Trough (Control or Instrumentation)

Plant Location - See coding listing Paragraph 1.3.

Generating Unit No. (Where required) 1.3 ADB- Administration Building FHR- Fuel Handling Riser ADR- Administration Building Riser RR- Relay Room AG- Aux Bldg. Grd. Fl. SG- Switchgear Rm-Grd. F1.

AM- Aux Bldg. Mezz Fl. SM- Switchgear Rm-Mez. Fl.

AU- Aux Bldg. Upper Fl. SH- Screen House AR- Aux Bldg. Riser SR- Screen House Riser -

BR- Battery Rooms TB- Turbine Rm-Cond Pit CV- Containment Vessel TG- Turbine Rm-Grd. Pl.

DR- D1 and D2-Diesel Rm TM- Turbine Rm-Moz. Fl.

SA-1 l'

ATTACHMENT 5-A ELECTRICAL CABLE AND CABLE TRAY CODING PAGE 2 OF 5 FHG- Fuel Handling Grd. Fl. TF- Turbine Rm.-Roof THM- Fuel Handling Mezz. F1. TR- Turbine Rm.-Riser FHU- Fuel Landling Upper F1. SM- D5/D6 Switchg. Rm-Nez.

DBG- D5/D6 LS1 Rms & Cont. Rm. SU- D5/D6 Switchg. Rm-Oper BR- D5/D6 Di0sel Bldg. Bat. Rm DBR- D5/D6 Dsl. Bld. Riser DBS- D5/D6 MCC cnd Cable Spread-ing Rms, DBB- D5/D6 Bldg - Basement DBM- DS/D6 Mech. Rms-Mezz.

DBU- D5/D6 Mech. Rms-Oper.

1.4 *Safeauard DesianatioD A -

A Train B -

B Train A/B -

121 Cooling Water R -

Reactor Protection Channel I W -

Reactor Protection Channel II X -

Reactor Protection Channel III Y -

Reactor Protection Channel IV 2.0 CABLE CODING 2.1 Each electrical cable shall have an identifying code indicated on electrical design drawing and cable routing list. This ssme code will be affixed at each end of the cable with permanent tags.

2.2 The identifying codes shall be based on the following systems:

2.3 4 KV Switchaear Cable Example: 2._5 4 07 -

1 h h h j Numerical sequence for power i

Alphabetical sequence for. control Cubicle No.

-4kV Electrical Bus No.

1 SA-2

ATTACHMENT 5-A ELECTRICAL CABLE AND CABLE TRAY CODING PAGE 3 OF 5 2.4 480V Switchaear Cable codes:

Example: 2_U B --

1 A h h h n Add alphabetical sequence for control L- Numerical sequence for connected :.uxiliaries  ;

Breaker No.

48CV Electrical Bus No. (Bus 211)

L' 2.5 Motet _CO.Dtrol Center Cable Codes:

Example: 2T.A 1 -

1 A Add al?habetical sequence far control Numerical sequence for connected auxiliaries MCC Bus No.

1 MCC Identity No.

2.6 DC Cable Codes:

Example: 1 R_Q A -

1 h h h h  !

Numerical Sequence '

For safeguards only -

A or B Train  ;

125 V DC 7 - Generating Unit No.

SA-3 E

l

ATTACHMENT 5-A ELECTRICAL CABLE AND CABLE TRAY CODING PAGE 4 0F 5 2.7 Control &__ Instrumentation Cable Codes:

Example: 1 * -

1 h i 0 Numerical Sequence Control or Instrumentation Function See Listing Below Generating Unit No.

• C -

Miscellaneous CA -

A Train CB -

B Train CAB -

A/B Train CX -

Reactor Protection Channel III (Blue)

CF -

Reactor Process Instrumentation (Foxboro)

CLD -

Part Length Rod Drives CM -

Radiation Monitors CN -

Nuclear Instrumentation Systems CP -

Computer CR -

Reactor Protection Channel I (Red)

CRD -

Rod Drive CRP -

Rod Position CS -

Substation CT -

Cooling Tower CV -

Invertor Bus & Distribution CW -

Reactor Protection Channel II (White)

CY -

Reactor Protection Channel IV (Yellow) 2.8 Pre-Fabricated Cables (Control Board Modules)

Example: P 41012 h h l Control Board Cutout No.

l Prefab Cable 5A-4 i

,-w ..

ATTACHMENT 5-A ,

ELECTRICAL CABLE AND CABLE TRAY CODING l PAGE 5 OF 5 '

3.0 color Codina Assianments The following colors will be utilized to identify the specific group which the cable tray, conduit and cables are assigned:

Orange - Safeguard Train "A" l Green -

Safeguard Train "B" j Yellow / Black - Safeguard Train "A/B" 4.0 Cable Trav Hanaer Codina 4.1 Non-trained cable tray 2 DBG - H 0001 h h h h Sequential #

hanger area code unit 4.2 Trained cable tray 2 DBM - H A 0001 6 h 4 4 h sequential #

-- trained designation A or B hanger area code unit SA-5 l'

L i

6.0 COOLING WATER SYSTEM MODIFICATION 6.1 SYSTEM FUNCTION The Cooling Water System has been designed to provide redundant cooling water supplies with isolation valves to auxiliary feedwater pumps, diesel generators (D1 and D2), air compressors, component cooling water heat exchangers, containment fan-coil units, and the auxiliary building fan-coil units, plus other non-essential loads. I i

The Cooling Water System simplified flow diagram is shown I on Figure 6-1.

Normal operation utilizes two horizontal pumps (21 and

21) with a vertical motor-driven pump (121) as a standby.

Two vertical diesel engine pumps (12 and 22) are p*covided l in the eventuality that all power supplies are lor.t. The diesel engine-driven pumps are used whent.ver an engineered safety features sequence is initiated, when auxiliary power is lost, or when header pressure decays ,

below its set point. l The diesel cooling water pumps, the vertical motor driven pump (121) and their associated equipment are located in the Class 1 portion of the cooling water screenhouse as shown on Figure 6-2.

All three pumps draw suction from the same pump bay for cooling water from the Mississippi River. An emergency cooling water intake from a branch channel of the river is also provided in case the river level drops suddenly or the intake canal is blocked.

A ring header which is shared by Units 1 and 2 can be isolated automatically to provide two redundant independent sources of train cooling water for all essential services. One train of the essential services for each unit is supplied from each side of the isolatable loop. Each side of the loop is designed to supply the needs for train of essential services for both units. Thus, failure of.one side of the loop still.

provides for the operation of all equipment required for the safe shutdown of both units.

As stated above, two diesel engine driven pumps are provided common to both Units 1 and 2. Redundant.(Train A and B) Safety Injection signals start both engine driven pumps in case of a DBA in either unit. Each engine driven pump is provided with both local and Main Control Room manual controls.

111

6.2 121 COOLING WATER PUMP UPGRADE l

The 121 Cooling Water Pump (121 CLP) was purchased as Quality Assurance Type 1 pump but is presently powered from a non-safeguard power source (4kV Bus 14) . The pump will be upgraded to function as a back-up to the 12 and 22 diesel engine driven pumps during maintenance and normal operation by repowering the pump motor from the 4KV safeguards buses and modifying the pump control system. The 121 CLP will also retain the function of a stand-by pump to the two horizontal pumps during normal operation.

The 121 CLP serves both units as part of the shared Cooling Water System and will be manually aligned with and powered from either of the Unit 2 Safeguards Buses.

The Unit 2 Auxiliary Power System has sufficient capacity to relocate the 121 Cooling Water Pump power sourceFor to either Unit 2 Safeguards Buses 25 or 26 f rom Bus 14.

emergency power, the new Unit 2 D5 and D6 emergency diesel generators have each been sized Thus tothestart 121 and CLP operate the additional 1000 HP load. from the diesel will have an independent power source driven safeguards 12 and 22 Cooling Water Pumps.

The existing 121 Cooling Watet Pump motorsafety was originally design purchased as Class IE. The motor classification will be upgraded as necessary by analysis to Safety Related Class 1E using the methodology applied safety design equipment. The to original plant classification of the pump remains as Safety Related.

The seismic design classification of the 121 Cooling Water Pump will be upgraded to Seismic category I using the seismic qualification documentation prepared for the original equipment. The controls of the 121 Cooling Water Pump will be modified to provide anUnit automatic 1, Unitstart 2,

for any Safety Injection (SI) signal:

Train A, or Train B. When both diesel driven pumps are operable, all three pumps will' start on the SIthen signal.

121 If both diesel driven pumps come up to speed, CLP will trip. If one diesel driven pump does fail to start, then 121 CLP will remain running.

The four existing cooling water header isolation valves, listed below, close on a safety Injection signal to separate the safety trains and assure cooling water system redundancy. The present control scheme aligns the 121 Cooling Water Pump to a diesel-driven cooling water This pump, depending on which unit has an SI signal.

control scheme will remain unchanged.

112 1

Valve Safety Train Automatic Act12D MV 32034 A Closes on SI Signal in Unit 2 MV 32035 B Closes on SI Signal in Unit 2 MV 32036 A Closes on SI Signal in Unit 1 MV 32037 B Closes on SI Signal in Unit 1 When it is necessary to take a diesel driven cooling water pump out of service for maintenance, the 121 Cooling Water Pump will be manually aligned to replaced the out of service pump. The appropriate MOVs will then be placed in the desired position (open, close) and then administrative 1y controlled in position by opening the MCC circuit breakers for the valve operators.

This modification to the 121 Cooling Water power supply and control scheme, plus administrative controls will provide a significant basis to allow one diesel driven cooling water pump to be taken out of service for maintenance without initiating a limiting condition for operation (LCO) condition. This will require a Technical Specification change with supporting analysis, which will be requested in a future submittal to the NRC.

The change also improves the reliability of the Cooling Water system during an engineered safety features initiation by providing a safeguards power supply to the 121 Cooling Water Pump that is manually selected from either Unit 2 4KV Safeguard Bus. The motor driven pump provides a diverse means of providing cooling water that is independent of a common-mode failure of the diesel drives for the 12 and 22 Cooling Water Pumps.

1 l

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7.0 IMPLEMENTATION PLAN FOR ADDITION OF DIESEL GENERATORS AND ELECTRICAL SYSTEM UPGT.ADE FOR PRAIRIE ISLAND UNIT 1 AND UNIT 2 The initial planning and scoping for this project began in September 1986 with the subsequent generation of the Project Major Milestone Schedule. This schedule logic has projected completion of all construction and final documentation by May of 1993. What is depicted here shows only the major Administrative, Training, Construction, and Testing activities that are deemed necessary to provide an overall view of the project. This will show that the project it being implemented in a safe, logical, and economical manner. The extensive engineering and procurement ef fort that is required to replace the entire electrical safeguard system for Unit 2 and upgrade the Unit 1 system is not portrayed but is implied as a prerequisite to support all these activities.

Becease the new construction effort will occur within the plant protected area and next to an operating unit, special attention has beca given to ensure all the operational and site security rules are adhered to. This plan was developed while observing the constraints of major construction having to occur within the existing plant as a backfit offort.

Although it is 1 specially dif ficult to interf ace with existing equipment and even harder to replace older equipment with new, we are confident this can be achieved by an extensive detailed effort.

Installation of cable tray, raceway, cable, and various equipment determined not to require a unit outage will be installed in the Turbine, Auxiliary and New DS/D6 buildings during Unit operations. These actions will support more efficient refueling outages.

Electrical and mechanical interface activities with major existing plant systems will be done during regularly scheduled refueling and maintenance outages to minimize impact on plant operations. The only exception being the modification of the Main Control Room Panel "G", which will be performed during a two-unit outage.

In order to meet the objectives of the plan the activities have been segregated into three major design changes.

1. Diesel Generator Building

2. D5/D6 Diesel Generator Installation

3. Plant Interface 114

l The highlights for the execution of each of the parts will be discussed in the follwing text. The most probable time frames will be depicted in a schedular form for each of the major act.ivities within each segregated design change on a succeeding page.

7.1 DIESEL GENERATOR BUILDING ACTIVITIES CONTAINED WITHIN THIS DIVISION OF THE OVERALL PLAN

-ARE:

?

7.1.1. D.G. BUILDING CIVIL STRUCTURAL CONSTRUCTION:

This shall include. site preparation, excavation aarthwork, architectural and structural- ' items including walls-floors-ceilings-doors-louvers-windows-stairs painting fireproofing, all structural steel erection, reinforcing steel installation,

-_ concrete placement-finishing, . waterproofing, installation of embedded electrical conduit, and

. D5/D6 diesel generator radiator installation.

7.1.2. D.G. BUILDING MECHANICAL SYSTEMS INSTALLATION:

This includes piping systems such as waste liquid,- a station air, and demineralized water.

7.1.3. D.G. BUILDING FIRE PROTECTION' INSTALLATION:

This includes installation and preoperational testing of the automatic sprinkler systems, standpipe riser- with hose stations, and deluge system with_open head sprinklers.

7.1.4. . J2. G . BUILDING ELECTRICAL INSTALLATION: r This includes- the l building power,- lighting-' &

. receptacles, communication, fire detection & alarm, security, . building grounding, and raceway-supports-wiring and terminations for.the above' systems as well as the fire protection wiring / terminations.

7.1.5. D.G. BULK FUEL OIL STORAGE CONSTR'UCTION1 This shall ' include site preparation, excavation earthwork architectural'- .and structural . items including reinforcing steel installation, structural steel erection, concrete placement for the walls-floors'-ceilings-accesses, and installation of.the bulk fuel oil storage tanks in the underground vault.

115

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7.1.6. D.G. BUILDING HVAC INSTALLATION:

This shal) include HVAC sheet metal ductwork, plenums, stiffeners, hangers, dampers, grills, registers, nozzles, diffusers, access doors, controls, electric heaters, air conditioning units, miscellaneous fans, filters, fan installation, and i balancing /preoperational testing.

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1 7.2 DIESEL GENERATOR INSTALLATION ACTIVITIES CONTAINED WITHIN THIS DIVISION OF THE OVERALL PLAN ARE:

7 . 2 .1. . D.G. INSTALLATION AND ALIGNMENT:

This includes the assembly, setting, aligning, and grouting of the new diesel generator sets on the

-foundations.

7.2.2. D.G. AUXILIARY EOUIPMENT INSTALLATION:

This includes the air start skid and receivers, lube oil, engine exhaust, and miscellaneous systems.

7.2.3. DEVELOP /IMPLEME_NT OPERATING / MAINTENANCE /I&C PROCEDURES:

This includes the development and use of the new procedures required for operations and maintenance once the new systems have been turned over to Plant t Operations.

7.2.4. DEVELOP / IMPLEMENT OPERATOR / MAINTENANCE TRAINING:

This includes training that will-be offered by the

. major equipment' vendors on _ the electrical and mechanical support equipment as well as the diesel generator set itself.

7.2.5. D.G. PIPING SYSTEMS INSTALLATION:

This includes piping for Air Start, Combustion Air, Fuel; 011, Lube Oil,- Cooling Water, and Engine Exhaust Systems.

7.2.6. D.G. CONTROL PANELS AND WIRING INSTALLATION:

This includes' panels _and wiring for the grounding cabinet, static. exciter voltage regulator, bench-board, vertical panel, and any miscellaneous electrical' panels.

7.2.7. 4KV/480V SYSTEMS INSTALLATION:

This includes-the installation wiring-and testing of two new 4160V safeguard buses and four new 480V Safeguard buses within the confines of the new building.

117

1 7.2.8. MCC SYSTEM & MISCELLANEOUS ELECTRIC PANELS INSTALLATION:

This . includes-installation and testing of two 480V safeguards motor control centers and miscellaneous electrical panels for diesel generator auxiliaries.

7.2.9. PREOPERATIONAL TESTING 1 This includes setup, testing, documentation, and turnover activities associated with all the diesel generator systems.

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DS/D6 DG INSTALL 4 TION IMPLEMENTATION

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7.3 PLANT INTERFACE ACTIVITIES CONTAINED KITHIN THIS DIVISION OF THE OVERALL PLAN ARE:

7.3.1. f.G. OUr.LIFICAi!?N LICENSING SUBMITTAL:

Ihic includes the submittal to the Nuclear P.egulatory Commission t'or an exception to the 300 Start Requirement of IEEE 38'i 7.3.2. "G" PANEL MOCKUP & OPERATOR /ENGIhEERING EVALUATION:

This includes the design and conscruction of the mockup panel as well as the reviev and comment period by. operations, engineering and the control room design committee.

7.3.3. DESIGN REPORT:

This includes the. report that is to be submitted +:

the Nuclear Regulatory Commission to describe the i.ew equipment, facilities, and extent of compliance to regulatory guidance for the Station Blackout. and Electrical Safeguards Upgrade Program.

7.3.4 EAE.EJY EVALUATION AND LICENSE AMENDMENT:

This includes the submittal to be made to the Nuclear Regulatory Commission for the actual Safety Evaluation,. . supporting documentation, and the proposed technical _ specification changes.

7.3.5 U1/U2 MEDIUM & LOW VOLTAGE CABLE ROUTING:

This: includes' work in the existing plant to support the installation of tray, raceway, and conduits to-f acilitate the installation of .new power sources for-Unit 2 4160V equipment'~ and- Unit 1.&-Unit 2 480V Motor Control Centers.

7.3.6. APPENDIX "R" ANALYEI1;.

This includes the re'iew of the 10CFR50 appendix R.

safe shutdown analysit and fire-hazards analysis to assess the addition of the new diesel generators and electrical power distribution .to ensure that electrical and physical separation commitments to 10CFR50 Appendix R are maintained.

119

f7.3.7. "GH-PANEL FINAL ENGINEERING AND DESIGN:

This incorporates all previously dispositioned.

operator, engineering, and control room design review committee comments into a final frozen design.

7.3.8, INSTL U1/U2 ELECTRICAL WIRING:

This includes work in the existing plant and new building to support the installation of cable in the trays, raceway, conduits to facilitate the installation of power sources for U2 4160V equipment and U1-& U2 480V motor control centers.

7.3.9. -REVISE U1/02 PROCEDURES:

This includes a comprehensive' review of all plant I procedures to ensure that any existing procedures that require changeu are revised to reflect the now electrical configuration. This would also include the identification and creation of any new=

= procedures.

'7.3.10 g.IMULATOR "G" PANEL MOD & OPERATOR TRAINING:

This includes the ~ modification of the simulator .;

' Control Room G panel to the final configuration and subsequent operator training that will be accompliched prior to the actual modification of the plant's mair Control Room G Panel.

7-.3.11 U1/02 FEB/ MARCH 92 OUTAGE:

This. includes installing the new main Control Room G Panel to segregate D1 &'D2 for U1 and DS &RD6 for j

U2, tie-in of new U2 4160V safeguard buses ' and loads, ; repowering of U2 -480V Safeguards Motor Control. Centers; and all required testing to return the units'to service in the new configuration.

7.3.12 INSTALL NEW U1 480V SAFEGUARD BUSES: ,

' This includes removing abandoned U2 safeguard buses,

+

and . Installing three of ' the four new U1 480V safeguard buses their place.

7.3.13 U1 480V FIELD WIRING:

This includes-the installation of field wiring to t power the.new 480V safeguards buses and-the 480V Motor Control Centers.

120 l

7.3.14 U1 SEPT /OCT 92 OUTAGE:

This includes the installation of one 480V safeguard bus and tie in of all four of the new 480V safeguard buses.

7.3.15 LTDATED SAFETY ANALYSIS REPORT SUBMITTAL:

This includes a USAR revision incorporating the changes resulting from .the . safeguards electrical system and cooling water system modifications. This would be included in the next annual USAR update to be submitted after the project is completed, l

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i 8.0 SAFEGUARDS AUXILIARY POWER SYSTEM OPERATION 8.1 EXISTING SAFEGUARDS AUXILIARY POWER SYSTEM DESCRIPTION Each existing diesel generator (D1 or D2) is capable of supplying power, in the event of loss of off-site power (LOOP), to all the necessary safeguards equipment of one ,

" Unit in an accident condition, plus the auxiliary loads for a safe (hot) shutdown of the other Unit. The maximum

. automatically connected loading for these conditions is about 2785 kW, which occurs in the first minute of diesel i generator operation. The D1 and D2 diesel generators

=

installed at the Prairie Island plant have an 8760 hour0.101 days <br />2.433 hours <br />0.0145 weeks <br />0.00333 months <br /> (continuous) rating of 2750 kilowatts. The 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> i rating of these machines is 3000 kilowatts and the 30 minute rating of the machines is 3250 kilowatts.

Paragraph C-2 of Safety Guide 9 states that the predicted load on each machine will not exceed the smaller of the 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating or 90% of the 30 minute rating of the 3 set. 90% of the 30 minute rating of the Prairie Island i diesel generators is 2925 kilowatts, and is less than the. I 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> ratings of 3000 kilowatts. As shown on Table-2-A, the total predicted connected load on either diesel generator is 2825 kilowatts.

8.2- EXISTING SAFEGUARDS AUXILIARY POWER SYSTEM OPERATION Each diesel generator is automatically started by either  !

of the following events:

a. Loss of voltage or degraded voltage on either of the u

- associated 4160-volt buses (buses 15 and 26 for D1 and buses 16 and 25 for D2); ,

b b. Initiation of a Safety Injection Signal (both diesel  !

6', generators start on this signal).

E With a' loss of voltage or degraded voltage on any of the 7 four safety-features 4160-volt buses, the automatic P , sequence is as follows:

a. Start associated diesel generator (D1 for buses 15

], and 26; D2 for buses 16-and 25).

{- b. Trip all-associated source breakers to bus.

c. Close breaker to offsite source if voltage is present;- (Bus 15. Reserve Auxiliary ?ransformer 1R)

(Bus 25 Reserve Auxiliary, Transformer 2R)1(Buses 16 and 26 - Cooling Tower 4160-volt Substation) . If this source is not available:

122

~

_ _ _ _ _ _ _ _ _ _ - - - _ _ - _ - - - - - - - - - - - - _ - - - - - _ - - - - - - - - - - -- - - - - - - - - ' - - - - - ^ ^ - ~ ^ - - - - -

l I

d. Close bus tie breaker to associated 4160-volt safety features- bus of ,the other Unit, if voltage is present; (Bus 15 associated with bus 26) (Bus 16  ;

associated with bus 25) If this source is not ,

available _

- e. ' Shed designated loads on the af fected 4160-volt bus and associated 480-volt buses experiencing undervoltage.

f. Close diesel generator breaker if voltage and frequency of the diesel generator meet established criteria. 4 Relays are provided on buses 15,16, 25, and 26 to detect loss of voltage and degraded voltage (the voltage level below ' which safety related equipment may not operate properly). On loss of voltage, the automatic voltage restoring scheme is initiated immediately. When degraded voltage is sensed,- the voltage restoring scheme is initiated if acceptable voltage.is not restored wi "in a short time period. This time delay prevents initiation i of the voltage restoring scheme when_ large _ loads are started and bus voltage momentarily dips below .the degraded-voltage setpoint. The undervoltage trip signal-to the_ diesel generator source breakers is blocked if the safety injection' signal is-present, thereby preventing  !

load ' shedding of. the emergency buses when they are being supplied.by-the diesels.

The degraded voltage protection setpoint is 9012% of nominal 4160 bus voltage with aLtime delay of 612 sec.

O Testing and analysis have shown that all safeguards loads operate properly' at- or above the degraded voltage Lh,; setpoint. The degraded voltage protection time delay has qc "

been shown by testing-and analysis to be long enough to--

allow : for voltage dips resultingL from ' the- starting of'

~1arge loads. -This time delay is also' consistent with the

, , maximum time : delay assumed- in the ECCS - analysis for a starting of a safety' injection pump. A maximum limit o_n the degraded voltage setpoint. has been established - to-

q. o prevent unnecessary ~ actuation'of the voltage restoring  ;

4 . scheme.

t o

~b ;

e The. loss of voltage protection setpoint is 55i10% of  !

-nominal 4160V bus voltage. Relays initiate a rapid- (less

@H  :

than four seconds) transfer to.an alternate source on Y Y loss of voltage.

l i 123  ;

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l l

1 l

Af ter voltage- is re-established _on the subject 4160-volt  !

. bus, either from an offsite source - or frou a diesel  !

generator, the diesel unit continues to run (loaded or unloaded) until manually shutdown. The 480-volt buses are immediately energized at the same time as the 4160-volt bus from which it is fed.

1 l' Running. loads which are not de-energized by the load shed i sequence and have maintained contact circuitry in their I starting. circuits will subsequently be re-energized when  !

bus voltage is restored.

t . Motors not running prior to the loss of voltage condition l n would not start upon restoration of voltage, until manual i or subsequent automatic action is initiated.

$ .c If there is a requirement for engineered safety features t .

operation coincident with or following bus undervoltage, load shedding as described in step "e" is initiated, '

followed by sequential startingLof the safety features  ;

4 equipment, t .

l 8.3' UPGRADED SAFEGUARDS AUXILIARY POWER SYSTEM DESCRIPTION The Upgraded Safeguards Auxiliary Power System:

\

Dedicates new EDGs DS and D6 to Unit 2 l Dedicates existing EDGs D1 and D2.to Unit 1 Dedicates cooling Tower offsite source Transformer l CT11 to Unit 1 with connections to Safeguards Buses 15 and 16 and Transformer CT12 to Unit 2 with connections to Safeguards Buses 25 and 26.

Retains dedication of offsite source Transformer 1R,-

i Y Winding to Unit 1 with connections to Safeguards 4'

4 4160V Buses 15 and 16 and Transformer 2RY to Unit 2 with connections to Safeguards 4160V Buses 25 and

26. 1 The offsite source and emergency diesel generator-

~

existing and proposed voltage restoration sequence are

' summarized. in Table 8-A. The sources for . Unit 1-Safeguards . Buses 15 and 16 will- be Transformer 1R-Y

, . Winding, Transformer CT-11 and EDGs - D1. and ' D2. The t-sources for Unit 2 Safeguards Bures 25 and 26 will be m ' Transformer 2RY, Transformer CT 12 and EDGs DS and DG.

124

' \

i The new additional emergency diesel generators (DS/D6) dedicated to Unit 2 Safeguards Buses will have a 8760 hour0.101 days <br />2.433 hours <br />0.0145 weeks <br />0.00333 months <br /> (continuous) gross rating of 5400 kW. At present, as- shown on Table 8-B, the (preliminary) total predicted connected Unit 2 Safeguards steady state load, excluding steps 1c, 2c, 4c, 5c and 7c which are reserved for future loads is 3758 kW per train. This represents approximately 70% of the diesel generator continuous gross rating. Approximately 400 kW of Unit 2 Emergency Diesel Generator D5 and D6. running auxiliary loads per unit is included in Load Step 6B.

E.4- UPGRADED SAFEGUARDS AUXILIARY POWER SYSTEM OPERATION one safety train from each unit will be normally supplied power from the "R" transformer while- the other safety train will be supplied from the "CT" transformer. With

, this arrangement, the loss of a single offsite source L transfer will cause the loss of only a wingle safety train per unit.

Loss of voltage on a~ safety bus will cause the dead bus relays to drop out. .This will cause the voltage restoration logic to check for voltage on the other

offsite . source available to tho bus, and will automatically cause a bus transfer to occur.if it is acceptable and a load sequence would.be initiated. If the other source is also unacceptable -(i.e. voltage less than the degraded relay setpoint value) then the logic will cause the emergency diesel generator to auto-start and a load, sequence would be initiated.

Presence of a degraded voltage condition on a' safety bus

.as sensed by-the degraded voltage relays would-initiate two1 time delays. The first-time' delay would-initiate a degraded voltage' alarm and would be setifor.a duration-

that would prevent nuisance ' alarms 'during large motor starting. The second time delay ~would initiate'a-bus load shed - diesel -generator start and- bus. load

-restoration sequenc'e. This - time ' delay would be of a duration that would confirm a persistent degraded voltage condition, but'would be less'than the time i that could

+.

damage ~to running safeguards. loads.

9

< l

[.V 125

TABLE 8-A EXISTING & PROPOSED VOLTAGE RESTORATION SEQUENCE EXISTING VOLTAGE RESTORATION SEQUENCE BUS BUS BUS BUS B h & H Normal Source 1RY 1RY 2RY 2RY First Choice 1RY CT-11 2RY CT-12 Second Choice Bus Tie Bus Tie Bus Tie Bus Tie ,

to 26 to 25 to 16 to 15

. Third Choice D1 D2 D2 D1 UPGRADED VOLTAGE RESTORATION SEQUENCE (see note)

BUS BUS BUS BUS M M M M Normal Source 1RY CT-11 2RY CT-12 First Choice CT-11 1RY CT-12 2RY

-Second Choice D1 D2 DS D6 NOTE: For. normal operation of the Upgraded' Voltage Restoration Sequence, the: choice of the normal source for each bus

-may be. reversed to the other dedicated source for that unit, provided that each bus is powered from a different source. .

This-prevents both safeguards buses-in a unit from simultaneously losing power in the event of a single

. power' source failure.

I I

~.

PRAIRIE' ISLAND NUCLEAR GENERATING. PLANT UNIT 2 -- SAFEGUARDS AUXILIARY POWER SYSTEM TABLE 8-B PAGE 1 OF 3 PROPOSED LOADING SEOUENCE MOTOR STEADY TIME INTERVAL TOTAL DG AUTOMATIC STARTING STATE FROM RECEIPT- STEADY SEQUENCE MOTOR INRUSli LOAD' OF SIGNAL TO STATE LOAD STEP SERVICE DESCRTPTION IIP KVA (f) KW START (SEC) KW

(@ rated 0 (d)

Motor Voltage)

1. a. Safety InjecP. ion 800 4472 (j) 631 10 ---

Pump (4kV) <

b. Miscellaneous 480V ---

2513 (h). 574 (h) 10 ---

I Loads (e)

c. Future' Motor. Load 90 542 (c) 75 10 1280 Block 1C ~(Total)

2. a. Residual Heat 200 1110 (c) 166 15 ---

Removal Pump (4kV)

b. Containment Spray 250 1194 (a) 207 15 ---

Pump (4kV)

c. Future Motor 755 4530 (c) 627 15 2280 Load-Block 2C (Total)

3. a. Cooling Water Punp 1000 5225 (j) 856 20 3136' (4kV)

4. a. Component Cooling 250 1416 (a) 207 25 ---

Pump (4kV)

b. Containment Fan 50 686 (b) 41 25 ---

Coil Unit (2 @

25 HP each) (460V)

c. Future Motor _

754 4525 (c) 626 25 4010 Load-Block 4C . (Total)

_~

1

=, -=-- ' - -

e, J

PRAIRIE ISLAND NUCLEAR GENERATING PLANT UNIT 2 -- ' SAFEGUARDS EMERGENCY POWER SYSTEM TABLE 8-B PAGE 2 OF 3 PROPOSED LOADING SEOUENCE MOTOR STEADY TIME INTERVAL TOTAL DG AUTOMATIC STARTING STATE FROM RECEIPT STEADY SEQUENCE MOTOR INRUSH LOAD OF SIGNAL TO STATE LOAD STEP ' SERVICE' DESCRIPTION HP KVA (f) KW START (SEC) KW

(@ rated 0 (d).

Motor Voltage).

5. a. Aux. Feedwater 300 1650 (a) 240 30 ----

Pump (4kV)

b. Air Compressor 100 578 (b) 83 30 ---

(460V)

c. Future Motor 318- 1908 (c) 264 30 4597 Load-Block SC (Total)

6. 3surizer 192 kW 192 (c)

a. .r 192 35 ---

Heaters

b. EDG Auxiliary . 500 3000 (c) 400 35 5189 Loads (Estimated)

7. a. Control Room 25 153 (c) 23 40 ---

Chilled Water Pump (460V).

b. Control Room Water 162 781 (c) 138 40 ---

Chiller (460V)

c. Future-Motor. Load- 60 360 (c) 50 40 5400 Block 7C.(Total)

TOTAL CONNECTED STEADY-STATE LOAD (LESS STEPS 1C,2C, 4C, SC and 7C) IN KW: 3758 Notes: (a) KVA in rush based on vendor data - motor locked rotor impedance.

(b) KVA in. rush based on vendor data - motor starting current.

(c) Estimated (d) Time zeroLis defined as the instant at which one of the following is first sensed:

- - - _- - _.: _ = . _. - . , - -- ..__ -.--.__---_ -

l ..

u.

t PRAIRIE-ISLAND NUCLEAR GENERATING PLANT

-UNIT 2 -- SAFEGUARDS EMERGENCY POWER SYSTEM

[~ TABLE 8-B l ' PAGE 3 OF 3 PROPOSED LOADING SEOUENCE MOTOR- STEADY TIME INTERVAL TOTAL DG

[ AUTOMATIC SC.4 TING STATE FROM-RECEIPT STEADY l SEQUENCE - MOTOR INRUSH LOAD OF SIGNAL TO STATE LOAD l STEP SERVICE DESCRIPTION IIP KVA (f) - KW START (SEC) KW

(@ rated O (d)

Motor Voltage)

I i

1. Automatic Safety Injection Signal l 2. Manual. Safety Injection Actuation by Pushbutton.

! 3. Undervoltage on the 4160V Bus Supplied by the Diesel Generator i

I (e) One 4160/480V, 1000. KVA, 8% impedance transformer which provides power to all 480V loads will.be energized as soon as bus voltage is restored.

(f) Starting power factor assumed at 0.2.

(g) Deleted (h) Step lb' KVA in rush and kW loads. based on 12/28/88 study.

(j) KVA in rush based on actual test data.

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