ML20087G480

Forwards Response to Power Sys Branch Request for Addl Info Re Communications Sys,Lighting Sys & Circuit Configuration Curves.Written Changes to FSAR Text,Including Table & Figures,Also Encl

ML20087G480
Person / Time
Site:	River Bend
Issue date:	03/07/1984
From:	Booker J GULF STATES UTILITIES CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
RGB-17230, NUDOCS 8403200034
Download: ML20087G480 (22)

Text

. .

GULF STATES UTILITIES COMPANY POST OFFICE BOX 2951

• BEAUMONT. TEXAS 77704 AREA COCE 409 83a 6631 March 7, 1984 RBG- 17230 File No. G9.5, G9.8.6.1 Mr. Harold R. Denton, Director Offico _ duclear Reactor Regulation U. S. Nuclear Regulatory Commisson Washingtor;, D. C. 20555

Dear Mr. Denton:

River Bend Station Unit 1 Docket No. 50-458

. . _ . Enclosed for_ your review ara Gnif_ States _ Utilities Company (GSU) responses to Request for Additional Information identified by the Nuclear Regulatory Commission's Power Systems Branch (PSB). This letter supplements information contained in docketed correspondence from J. E. Booker to H. R. Denton dated December 30, 1983 and February 10, 1984. Attachment 1 of this letter summarizes the Staff request identified in meeting between GSU and PSB dated February 15, 1984. The following enclosures contain the actual written. changes to the FSAR text including all ubles and figures. These changes will be incorporated into the FSAR in a future amendment.

Sincerely,

, h. - 7 J. E. Booker Manager-Engineering Nuclear Fuels & Licensing

) River Bend Nuclear Group J je Attachments 8403200034 840307 gDRADOCK 05000458 PDR 00(

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Attachment 1 Listed below are responses to requests for additional information. This completes GSU's responses to the items discussed at our February 15, 1984 meeting.

1. Communication Systems - Enclosure 1 provides our revised response to Staff renuast for additional information number 430.65.

2. Lighting Systems - Enclosure 2 provides our revised response to Staff request for additional information number 430.68.

3. I t Curves - Enclosure 3 provides our revised response to Staff request for additional information number 430.26. Please note that the curves are provided here in Enclosure 4 as docketed information, but will not be included in the FSAR.

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I ENCLOSURE 1 1

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RBS FSAR k QUESTION 430.65 (9.5.2)

The information regarding the onsite communicatians system (Section 9.5.2) does not adequately cover the system capabilities during transients and accidents. Provide the following information:

a. Identify all working stations on the plant site where it may be necessary for plant personnel to communicate with '

the control room or the emergency shutdown panel during and or following transients and/or accidents (including fires) in order to mitigate the consequences of the event and to attain a safe cold plant shutdown.

b. Indicate the maximum sound levels that could exist at each of the above identified working stations for all transiants and accicent conditions.

c. Indicate the types of communication systems available at each of the above identified working stations.

d. Indicate the maximum background noise level that could exist at each working station and yet reliably expect effective communication with the control room using:

1. The page party communications systems, and

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2. Any other additional communication system provided that working station.

e. Describe the performance requirements and tests that the above onsite working stations communication systems will be required to pass in order to be assured that effective communication with the control room or emergency shutdown panel is possible under all **

conditions.

f. Discuss the protective measures taken to assure a functionally operable onsite communication system. The discussion should include the considerations given to component failures, loss of power, and the severing of a communication line or trunk as a result of an accident or fire.

RESPONSE

N_.."_.desiRn criteria for River Bend Station does not reau. ire. communications

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'-- ^~ ^ # with personnel outside the main control room (or the II remote shutdown panel) to effect safe shutdown.

Amendment 11 Q&R 9.5-7 January 1984

RBS FSAR

c. Fire fighting

d. Recovery

4. Fire Protection Training and Drills

a. Duties and responsibilities

b. Outline training ccurse requirements

c. Drill planning guides

d. Critique of drills

e. Documentation These procedures utilize the guidance contained in National Fire Protection Association (NFPA) Standards 4, 4A, 6, 7, 8, 27, and 802.

The Quality Assurance program, as it applies to the fire protection systems, is discussed in Section 9A.3.4 of Appendix 9A.

Fire protection related to emergency planning is discussed under the appropriate areas of Section 13.3.

9.5.2 Communication Systems 9.5.2.1 Design Bases Communication systems are provided for reliable intra plant, intra-site, and plant-to-offsite communication to meet the requirements of cporation and maintenance of the units.

These systems have redundancy or diversity to ensure communications during all modes of plant operation including emergencies. However, these communications systems are not required to prevent or mitigate the consequences of design basis events, a fire, or security threats. Physical and electrical independence are maintained between the systems.

Power sources for each system are listed in Table 9.5-1.

The maximum sound level that could exist in the area of the Ill communications systems' stations is 90 dB as specified by OSHA requirements, except for the main control room which has a maximum permissible sound level of 65 dB. Speakers in  :

expected high l

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9.5-10

! , , RBS FSAR -

TABLE 9.5-6

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i XORK / EQU_IPMENT_A.REA 4s N  % N 7 MATM CONTROL ROOM \ X X X ./ X X - -

I RMT SHUTDOWN PNL DIV I N < X X X/ X X - -

RMT SHUTDOWN PNL DIV II \Y X /TC Y X SSW PUMP HOUSE \ X s

' X X DTESEL GENERATOR DIV I (1) N [ X X e l DIESEL GENERATOR DIV II (1) '

M X X 5

, DIESEL GENERATOR DIV III (1) / X\ ,

X X STDBY SWGR ROOM - DIV I / X \X s i

STnRY SWCR ROOM DIV II / X \ ,

, STDRV BA11txY ROOM DIV I / (1) X %. X y STDBY BATTERY ROOM DIV II / \X i

(1) $

RHR PUMP A / (1) X X A *

RHR ROOM B / (1) Y X X N

] RHR ROOM C [ (1) X X X \

RCIC TURBINE /PlR6 ROOM (1)

HPCS PUMP W M X [ y X \

(1) X X X \

LPCS PU 7 ROOM (1) ._.-.-X-

/

X X \ ^

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ENCLOSURE 2

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RBS FSAR l

QUESTION 430.68 (9.5.3) 3.,

Table 9.5-2 list the areas of the plant in which emergency lighting is installed. For all areas listed, with the exception of the control room, emergency lighting consists of battery powered incandescent fixtures rated for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> of operation. Expand the lighting section of the FSAR to include a discussion of how lighting will be provided for these areas in the event of a sustained loss of offsite ac power (in excess of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and up to 7 days), or provide I the rationale why lighting is not required in these areas.

Include in your discussion what, if any, other areas would require lighting during a sustained loss of ac power, and how it would be provided.

RESPONSE

The response to this request is provided in revised 3,

Sections 9.5.3.1 and 9.5.3.2, Dr.nd-+M revised Table 9.5-2, and in revised Figure 9.5-9.

I As indicated, the design criteria used for River Bend Station does not require personnel to continuously occupy areas outside the main control room (or the remote shutdown panel) to effect safe shutdown, Other areas in Table 9.5-2 are provided with battery pack lighting to facilitate evacuation of personnel, h:,

Any additional lighting required for short excursions into the plant will be provided to personnel by portable equipment ( e.g., hand-held flash-lights and/or lanterns).

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l Amendment 11 Q&R 9.5-10 January 1984 l

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RBS FSAR room. Batteries furnishing power to these UPSs are sized for a minimum of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. Emergency dc lighting, supplied from the battery pack system, is provided in standby generator areas, standby switchgear rooms, standby service water pumphouse, l Class 1E battery rooms, standby motor control centers and load centers, remote shutdown panel rooms and areas required for egress and exit of buildings. The battery packs are designed to sustain the illumination level for a period of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

9.5.3.2 System Description Outdoor area lighting is controlled by light-sensing devices. High pressure sodium fixtures are used for general yard and roadway lighting. They are suppiled by 240-V or 480-V ac, single phase power. Fluorescent and incandescent fixtures are supplied by 120-V/240-V ac, single phase , 3-wire power. The station lighting systems are divided into three systems (Fig. 9.5-9):

1. Station lighting System 1 (normal) receives power from the normal service buses of the station service ac power distribution system described in Section 8.3.1.

In the main control room the normal ac lighting l system feeds a manually controlled backup ac lighting subsystem with approximately 20 percent of the main control room lighting fixtures. These fixtures can be manually transferred to one of the available Class 1E buses supplied by a standby diesel generator, which can furnish power for up to 7 days, or to a non-Class 1E source of power. It is normally connected to one of the Class 1E buses.

2. Station lighting System 2 (safety ac lighting) receives power from the normal uninterruptible power supply (UPS) system and is confined to the main control room. Twenty percent of the total fixtures in the main control room are supplied from ,

System 2. l

3. Station lighting System 3 (emergency de) receives power from the local battery packs, which are normally fed from the normal ac system. Local  ;

battery packs are installed in the following areas I as indicated in Table 9.5-2: l

a. Main control room (egress)

b. Standby diesel generator building i

c. Class 1E switchgear rooms yl '

9.5-17

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RBS FSAR l l

d. Standby service water pump house

e. Class 1E Battery rooms

f. Standby MCC's and load centers

- g. Remote shutdown panel rooms

h. Means of egress and building exits r

The main control room and remote shutdown panels are the only creas requiring continuous lighting in excess of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> which is provided as described above.

< In case of faiiate v! the normal ac lighting system, exit signs and means of egress throughout. the station are i

illuminated by System 3. In the event of failure of the normal ac lighting system and a loss of offsite power, portable lighting (battery-powered lanterns) is available for all areas of the plant.

l 9.5.3.3 Safety Evaluation In- all Seismic Category I structures, the lighting fixtures and conduits are seismically supported. In the main control I

room, they are seismically supported in accordance with structural requirements for control room design: lighting over zhe main control and computer areas is supplied from a louvre. All ceiling lighting and fixtures are the fluorescent strip type and are securely mounted above and independent of the louvres. The remaining areas are illuminated by recessed fluorescent fixtures in an

acoustical suspended ceiling. The fixtures are double suspended, i.e., from the suspended ceiling and from the structure.

All battery packs are a sealed type and are seismically supported. These battery packs are designed to give

, sustained illumination for 8 hr following a loss of-normal power.

Because the remote shutdown panel rooms and 2C percent of ll the main control room fixtures are connected to a Class 1E i

bus, special design considerations have been made. From the Class 1E bus to and including the power receptacle, the circuit is . designed as Class 1E with two independent overcurrent protection devices installed in the_ circuit to ensure protection of the Class 1E portion of the circuits.

From and including the plug, it is treated as a non-Class 1E I

system, with additional safety protection as follows:

1. The transformer load is limited to 75 percent of its maximum rating.

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2. The circuit breaker installed on secondary windings of the transformer trips at 100 percent of the transformer rating.

9.5-18.

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1 RBS FGAR

3. No load other' than the lighting fixtures is ,

connected to this circuit.

4. Wiring for this system is run in separate conduits.

9.5.3.4 Inspection and Testing Requirements Normal operation of the lighting system results in easy identification of malfunctions, and continuous routine maintenance and housekeeping ensures reliability. Battery '

pack units are provided with local test switches to simulate loss of normal ac power. These are tested monthly to ensure operability of the system components.

9.5.4 Diesel Generator Fuel Oil Storage and Transfer System The plant is provided with two standby diesel generators and one HPCS power supply diesel generator operating on No. 2D diesel fuel oil, with each engine supplied by a separate diesel generacor fuel oil storage and transfer system. The standby and HPCS diesel generator fuel oil storage and transfer systems are shown in Fig. 9.5-2.

9.5.4.1 Design Bases Each diesel generator fuel oil storage and transfer syatem is in accordance with the following criteria:

1. The diesel generator fuel oil storage and transfer ,

systems are designed to Safety Class 3 and Seismic' Category I requirements.

2. The equipment mounted on the diesel generator is designed and fabricated to the manufacturer's

. quality assurance standards and Seismic Category I requirements.

3. The diesel generator fuel oil piping, pumps, valves, and oil tanks are designed, constructed, and tested in accordance with ASME Boiler and Pressure Vessel Code,--Section III, Safety Class 3.

4. Tne system design incorporates sufficient redundancy to prevent a malfunction or ' failure of any active or passive. component from impairing the capability of the system to supply fuel oil to at least two of the three diesel engines.

9.5-19

_________----_=-____-__

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RBS FSAR TABLE 9.5-2 ILLUMINATING LEVEL AND TYPE OF FIXTURES USED IN PLANT AREAS NECESSARY FOR SAFE SHUTDOWN OR EVACUATION OF PERSONNEL No rma l Lichtina Eme roency L ight i ng A rea Fixture f_Q Sou rce Fixture [.g

1. Main control F l uo rescent 125 (Main console) UPS F luo re scent 25 (a) room s 100 (Computer) Standby

• Battery pack F l uo rescent Incandescent 25 (b) 0.5 (c) ll

2. Standby switch- F luo rescent 35 Battery pack incandescent 3 gear rooms

3. Class lE F l uo rescent 20 Battery pack incandescent 3 Battery Rooms (enclosed se casketed)

! 4. Standby diesel F l uo rescent 20 Battery pack Incandescent 3 ea3 I

generator areas ll:

5. Standby service fluorescent 20 Battery pack incandescent 3 water pumphouse

6. Standby McC 's and Fluorescent load centers 20 Battery pack incandescent 3 ll[

7. Remote shutdown F l uo re scent 100 Battery pack incandescent 5 panel rooms Standby * (LTR) (LTR) l

8. Means of egress Fluorescent or 5 Battery pack Incandescent 0.5 and exit incandescent (all buildings)

a. 20 percent or rixtures connected to UPS.

b. 20 percent or fixtures connected to standby source and switchable to other sources by administrative control,

c. means of egress and exit.

• Area lighting required for safe shutdown of 1 li

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REMOTE SHUTDOWN MAIN CONTROL ROOM CCMRAL S AFETY EXIT A l PANEL ROOMS STATION RELATED AREAS EGRESS DIV I/DIV II FIGURE 9.5-9 l h MANUAL PLUG CONNECTION TO ALTERNATE SOURCE LIGHTING SYSTEMS ARRANGEMENT i

h BATTERY PACK LIGHTING UNIT ONE LINE DIAGRAM i

l l RIVER BEND STATION I FINAL SAFETY ANALYSIS REPORT

e o ENC [OSURE 3 l

RBS ESAR

1. I% QUESTIO14 430.26 (8.3.1)

D' in Your discussion of electrical penetrations Section 8.3.1.1.4.3 of the FSAR does not provida sufficient informatich for evaluation. We require the following requirements of IEEE standard 279-1971 must be satisfied with regard to the protection of the electrical penetrations:

1. The system shall, with precision and reliability automatically disconnect power to the penetration conductors when currents through the conductors exceed the established protection limits.

2. All primary and backup breaker overload and short circuit protection systems shall be qualified for the service environment including seismic. However the seismic qualification for non-class 1E circuit breaker protection systems should as a minimum assure that the protection systems remain operable during an operating basis earthquake. In addition, the non-class 1E circuit breaker and protection system shall be of high quality.

3. The circuit breaker protection system trip set g>g points and breaker coordination between primary and (iJ backup protection shall have the capability for test and calibration. Provisions for test under simulated fault conditions should be provided. For designs where protection is provided by a combination of a breaker and a fuse or two fuses in series, provisions shall be provided for non-destructive testing of fuses.

4. No single failure shall cause excessive current in the penetration conductors which will degrade the penetration seal.

5. Where external control power is needed for tripping breakers, cignals for tripping primary backup breakers shall be independent, physically separated and powered from separate sources.

Provide response to address the above and additionally provide time-current coordination curves for each size penetration. These curves shall include I2 t penetration and cable rating curves for instantaneous, long and short time overcurrent trips provided by primary and backup protective devices. Include a single line diagram which shows circuit

$h. Amendment 3 Q&R 8.3-17 April 1982

?

RBS FSAR configuration and breaker coordination in addition to the .

l provided curves. l l

RESPONSE typical The response to this request is provided in reviced Sections 8.3.1.1.4.3 and 8.3.1.1.5.1. In addition, I2t and breaker coordination curvest.nii re pr:cid:d ir nc'. rigu rc;;

11 p 3-132 *hr^ ugh S.2-120 in "Cr;h 100'- ./ have been provided in separate docketed correspondence dated March 7, 1984.

Amendment 11 Q&R 8.3-18 January 1984

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