ML20044G767

Forwards Markups to Chapter 8 Matl Resulting from 930527 Ge/ NRC Telcon

ML20044G767
Person / Time
Site:	05200001
Issue date:	05/28/1993
From:	Fox J GENERAL ELECTRIC CO.
To:	Poslusny C Office of Nuclear Reactor Regulation
References
NUDOCS 9306040231
Download: ML20044G767 (7)

Text

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GENuclearEnergy C+neralDectric Company 175 Curtner Avenue. San Jose. CA 95125 May 28,1993 Docket No. STN 52-001 Chet Poslusny, Senior Project Manager Standardization Project Directorate  :

Associate Directorate for Advanced Reactors and License Renewal Office of the Nuclear Reactor Regulation

Subject:

Submittal Supporting Accelerated ABWR Review Schedule - Chapter 8 Modifications

Dear Chet:

Enclosed are SSAR markups to Chapter 8 material that resulted from the GE/NRC conference call on May 27,1993. The following items are addressed:

Confirmatory Items 8.s3.3.10-1,8.3.8.6-1, and 8.3.8.7-1 Please send copies of this transmittal to John Knox and Dale Thatcher.

Sincerely, brJNF _;

Jack Fox -

Advanced Reactor Programs cc: Bob Strong (GE)

Norman Fletcher (DOE) t I

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(see 8.3.4.15). The ABWR therefore exceeds the requirements of the policyisge. t h e r- beh dt N r

@ y y 9ifl " 5 to .<clo r el C n tend [cr ike frofr&ta 8.3.2 DC Power Systems ,3 g fever 595 e"Sf ancI E<f orf me n t 89 l M'" # # "

8.3.2.1 Description ( C5 tkA' Sf*"d'"d' jI,

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8.3.2 1.1 General Systems A DC power system is provided for switchgear control, control power, instrumentation, critical motors and emergency lighting in control rooms, switchgear rooms and fuel handling areas. Four independent Class 1E 125 Vdc divisions, three independent non-Class lE 125 Vdc load groups and one non-Class 1E 250 Vdc computer and motor power supply are provided. See Figures 8.3-4 for the single lines.

Each battery is separately housed in a ventilated room apart from its charger and distribution panels. Each battery feeds a de_ distribution switchgear panel which in turn feeds local distribution panels and de motor control centers. An emergency eye wash is supplied in each battery room.

All batteries are sized so that required loads will not exceed warranted capacity at end-of-installed-life with 100 percent design demand.

The capacity of each of the four redundant Class 1E battery chargers is based on the largest combined demands of the various continuous steady-state loads, plus charging capacity to restore the battery from the design minimum charge state to the fully charged state within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> (per technical ,

specifications), regardless of the status of the plant during which these q' 1 demands occur fsee o.3.J.. M u h p lh8.3.2.1.1.1 Class 1E 125 Vdc System hMA <<h C I

@f >I The 125 Vdc system provides a reliable control and switching power source for the Class 1E systems.

Each 125 Vdc battery is provided with a charger, and a standby charger shared by two divisions, each of which is' capable of recharging its battery from a discharged state to a fully charged state while handling the normal, steady-state de load.

Batteries are sized for the de load in accordance with IEEE Standard 485.

The batteries are installed in accordance with industry recommended practice as defined in IEEE 484, and meet the recommendations of Section 5 of IEEE 946 (see 8.3.4.32).

In accordance with this standards, each of the four Class 1E 125-volt batteries:

1) is capable of starting and operating its required steady state and transient loads, c:\ow62\ch8/ch8 draft.wp March 30, 1993 .

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MARK-UPjTEXT INSERTS

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INSERT Ah (NRC request to close iter.j 8.3. 3.14-1 per 5-24-93 phone c 1) l There are three automatic switching modes for the CVCF power supplies, any j of which may be initiated manually. First, the frequency of t e output of the inverter is normally synchronized with the input ac power. the frequency of ,

the inpu: power goes out of range, thfpowersupplyswitc s over to internal synchronization to restore the frequenpy of its output, witching back to ,

external synchronization is automatic pnd occurs if th frequency of the ac power has been restored and maintained} for approxima ly 60 seconds.

The second switching mhde is from tc to de f the power source, If the i voltage of the input ac poweiN is less than 88% f the rated voltage, the input is switched to the de power supply. Tfeinpq.. is switched back to the ac power after a confirmation period of approximate 1 60 seconds.

The third switching mode is betwe'bphe inverter and the voltage regulating tran g r ymewhich receives power froftbe same bus as the primary source. If any of the conditions listed below cur '

voltage regulating trasfErnierr- - d, the power supply is switched to the /

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(a) Output voltage out of rati by mc re than s or minus 10 per cent (b) Output frequency out of ing by more than pl%s or minus 3 per cent (c) High temperature ins de of panel

, (d) Loss of control wer po/supply /

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(e) Commutation/fa'ilure

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(f) Over-current of smoothing condenser j

(g) Loss of' control power for gate circuit (b) Incoming MCCB trip \

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(i) Cooling fan trip \ ,

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s/INSERT AC (NRC request to close item 8k.3.8.6-1 per 5-27-93 phone call) ,5 / i

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The battery chargers are designed to prevent the ac power supply from becoming a load on the battery. They also have provisions to isolate transients from the ac system from affecting the de system; and conversely, j provisions to isolate transients from the de system from affecting the ac  ;

system. The battery charger system is sized in accordance with the guidelines '

of IEEE 946. The design of the de system includes the capability to J periodically verify the required capacity for each of the battery charger power  !

supplies (see 8.3.4.35). l macnw \

the remaining ac power divisions. The plant design and circuit layout from

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these de systems provide physical separation of the equipment, cabling and instrumentation essential to plant safety.

Each division of the system is located in an area separated physically from other divisions. All the components of Class 1E 125 Vdc systems are housed in Seismic Category I structures.

8.3.2.1.3.1 125 Vdc Systems Configuration Figure 8.3-4 shows the overall 125 Vdc system provided for Class 1E Divisions I, II, III and IV. One divisional battery charger is used to supply each divisional de distribution panel bus and its associated battery. The divisional battery charger is normally fed from its divisional 480V MCC bus, with no automatic interconnection or transfer between buses. Also, there are no manual interconnections between de divisions except those involving the standby battery chargers, as described below.

Each Class 1E 125 Vdc battery is provided with a charger, and a standby charger shared by two divisions, each of which is capable of recharging its battery from a discharged state to a fully charged state while handling the normal, steady-state de load. Cross connection between two divisions through a standby charger is prevented by at least two interlocked breakers, kept normally open, in series in each potential cross-connect path. (See Figure 8.3 4 and Subsection 8.3.4.18.)

The maximum equalizing charge voltage for Class 1E batteries is 140 Vdc.

The de system minimum discharge voltage at the end of the discharge period is 1.75 Vdc per cell (105 v lts for the battery). The operating voltage range of Class 1E de loads is 100 to 140V.

As egeneselrequiremenesEhebatterieshavesufficient stored energy to -

operate connected Class 1E loads continuously for at least two hours without it i c recharginL_/fhe DivisionfYbattery wh'fdh~controTf E RCIC system is

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rsufFeient for eisht hours durine dation bl*ckout>G DurEs~~.12qve,nt]L g ,_ _

._ D also ex2$Ed the

,} wtimes e mthese the batteries load reductions d i" -- _

are available (See Subsection 19E.2.1.2.2). Each distribution circuit is capable of transmitting sufficient energy to start and operate all Jaguirap_.1nads in that circuit.

g3flN QA &pK f h, Co*f A 1 ad capacity ina ysis has been performed based on IEEE 485-1978, and _

j submitted on the docket for estimated Class 1E de battery loads as of September, 1989. A final analysis will be performed when specific battery.

parameters are known (see 8.3.4.6).

An initial composite test of onsite ac and de power systems is called for as a prerequisite to initial fuel loading. This test will verify that each battery capacity is sufficient to satisfy a safety load demand profile under the conditions of a LOCA and loss of preferred power.

Thereafter, periodic capacity tests may be conducted in accordance with IEEE Std 450. These tests will ensure that the battery has the capacity to continue to meet safety load demands. ,

c:\ow62\ch8/ch8 draft.wp m ch 30, 1993 __ _ _ _ _

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A capacity and voltage drop analysis will be performed in accordance with IEEE 79 141 to assure that power sources and distribution equipment will be capable of transmitting sufficient energy to start and operate all required-loads for all (0[/l '

plant conditions.  ;

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(7) The \bos s tie arrangment, /and the capacityiand capability of the CTG,j 's i

designebsuch that the time to place the,CTQ on line to feed any pne train ofshutdowngads ( fe., includes manual'conhection to any one Class lE '

bus) shall be w{thi 10 minutes. i INSERT T (87 CONF / 1.155, Sect. 3.3.5 assessment)\

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ThereliabilityjdtheCTG'shquidmeet or exceed 95 perc t; as determined in ,

NSAC-108 or egntvalent methodhlogy.

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\accordancewit INS-ERT U 7 CONF - RG 1.155, Sect. }.3.5 asses ment)

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6. TE - tric Power Research Institute, "Re ility of Emergency hfiesel G 2hrators at U. S . NuclearJouar--Ph ,

NSAC-lO8,SeptemberII86.

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.X s WSERT V (6'6 CONF) s /

Light. fixtures 13 safety areas a seismica ly support , an are design d with appropriate grids \pr diffusers such that b oken materia ill be contai ed and

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/ willnotbecomeahjardto rsonnel or s fety equipment' ring or.follod ng a l seismic event.

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\ x Displays provide in the Mai Control R m R) consist of (but are t necessarily lir ted to) the fo lowing: Ma Generator output voltage, . peres,  ;

watts, VARS .r power factor), ec ; nc , nd synchronization; also, distributio system medium voltag h(M/ swit.chgear voltages, feeder and 1 ad 7 amperes, d circuit breaker positihar.

Manua controls are provided in the'M R or the Main Generator output circuit breaker, the medium voltage (M/C)/switchg k feeder circuit breakers, and load circuit breakers to power centers or! motor c6ntrol centers. ,

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ABWR is designed in accordance with all criteria. Any exceptions or j clarifica.tions are so noted.  ;

(1) General Design Criteria (CDC):

i (a) Criteria: CDCs 2, 4, 17, and 18. ,

(b) Conformance: The de power system is in compliance with these GDCs .

The GDCs are generically addressed in Subsection 3.1.2.

(2) Regulatory Guides (RGs):

(a) RC 1.6 - Independence Between Redundant Standby (Onsite) Power Sources and Between Their Distribution Systems s

lbd (b) RG 1.32 - Criteria for Safety-R tad Electric Power Systems for N' , eid) - Nuclear Power P1 ,

h tovea$elSeit8H15 f j 1# + Fuses cannot be periodica11* tested4 and are exempt fro such i irements per Section 4.' EEE 741.

(c) RC 1.47 - Bypassed and Inoperable Status Indication for Nuclear

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V Power Plant Safety Systems -

(d) RG 1.63 - Electric Penetration Assemblies in Containment Structures '

for Light-Water-Cooled Nuclear Power Plants (e) RG 1.75 - Physical Independenes of Electric Systems i The DC emergency standby lighting system circuits up to the lighting l fixtures are Class 1E associated and are routed in seismic Category I raceways. However, the lighting fixtures themselves are not seismically qualified, but are seismically supported. This is acceptable to the Class 1E power supply because of over-current ,

protective device coordination. The cables and circuits from the power source to the lighting fixtures are Class 1E associated. The bulbs cannot be seismically qualified. This is why the circuits are  ;

Class IE associated. The bulbs can only fail open and therefore do

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not represent a hazard to the Class 1E power sources.

Besides the emergency lighting circuits, any other associated  ;

circuits added beyond the certified design must be specifically identified and justified. Associated circuits are defined in Section  ;

5.5.1 of IEEE 384-1981, with the clarification for Items (3) and (4) l that non-Class 1E circuits being in an enclosed raceway without the ,

required physical separation or barriers between the enclosed raceway and the Class 1E or associated cables makes the circuits (related to the non-Class 1E cable in the enclosed raceway) associated circuits.. l (f) RG 1.106 - Thermal Overload Protection for Electric Motors on Motor-Operated Valves Safety functions which are required to go to completion for safety have their thermal overload protection devices in force during normal l c:\ow62\ch8/chSdraft.wp March 30, 1993 45-

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MARK-UP TEXT INSERTS f!S h E (35 CONF) '

N j(5) Other'Cniteria p/

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IEEE 741\- andard fit Criteria for the Protection of C)tss lE Power Systems l(a) and Equipmenth Nuclear Power Gene:ating Stations"f

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The ABWR fully meet the requirements of this standard.

/ i INSERT F (35 CONF) \

(5) Other Criteria /

(a) IEEE 946 - " Recommended Practice for bbe Design of Safety-Related DC ,

1 AuxiliaryPowerSystemsforNuc)earPowkGeneratingStations" l The ABWR fully meets the requ rements of th etandard.

j t INSERT G (65 CONF) /

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This equipment is des >Igned and qualified to survive the comb sed effects of temperature, humidJty, radiation, and other conditions related ith a LOCA or other design-basisi event environment at the end of their qualifi and/or /

design life. j INSERT H, (43 CONF)

These/ overload bypasses meet the requirements of IEEE 603, and are capabl of/

l being periodically tested (see 8.3.4.24). ,/

INSERT I (71 CONF) -

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Section 5.2 of IEEE 308 is addressed for the ABWR as follows:

Those portions of the Class 1E power system that are required to support safety systems in the performance of their safety functions meet the requirements of ,

IEEE 603. In addition, those other normal components, equipment, and systems (that is, overload devices, protective relaying, etc) within the Class 1E power j - -

j, system that have no direct safety function and are only provided to increase l[

the availability or reliability of the Class 1E power system meet those j\ql~ ,

requirements of IEEE 603 which assure that thoce components, equipment, and /  ;

systems do not degrade the Class 1E power system below an acceptable. level.

l However, such elements are not required to meet criteria as defined in IEEE 603 /

for: operating bypass, maintenance bypass, and bypass indication."

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