US-APWR

NRC Questions

April 18, 2008

Mitsubishi Heavy Industries, Ltd.

1m1 EI E S, LTD. 4GG-UAP-20080026-0

NRC QUESTION - Starting Air Capacity (1/3) P"-

> The MHI documents state the starting air system isgood for 3 start attempts. The current StandardReview Plan has a recommendation of enoughair for 5 attempted starts. How is MHI addressing thatdelta?

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NRC QUESTION - Starting Air Capacity (2/3) (u:

The US-APWR is provided with four (4) 50% GTG.If one GTG is in the test mode (or after testing iscompleted), the remaining three (3) GTG canensure that the plant safety system can bepowered, even if a single failure is considered.Therefore, each GTG has sufficient air to allow forthree (3) start capability.

4GG-UAP-20080026-2SiT._SI _HI -9EAV-Y-I•DM T R I E S, LTD.

NRC QUESTION - Starting Air Capacity (3/3)

> It is assumed that the reasons and basis for sufficient air forfive (5) start requirement are:

- The requirement has been provided for a conventional(typical) NPP equipped with two (2) safety trains.

- Each EDG should be able to be tested. If one EDG is intest, only the other EDG is available to perform its safetyfunction.

- It is preferable that each EDG has air storage for twotimes start capability in consideration of test.

- It is not necessary to assume that a LOOP occurswhile one EDG is tested, but it is necessary to assume that aLOOP occurs after the completion of EDG testing.

- The air receiver should have enough capacity. That isminimum 3 times in addition to above two times. Therefore,EDG should have total about 5 times capability.

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NRC QUESTION - Safety vs. Non-safety GTG (us:]O

(1/2)

e Discuss the difference between safety GTGsversus non-safety GTGs

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NRC QUESTION - Safety vs.(2/2)

Non-safety GTGO u(.

i ý

Rating

Starting

Location

Fuel Supply & Storage

Qualification

Auxiliaries

4500kW, 6.9kV

Air

Independent

Independent

Class 1E

Independent

4000kW, 6.9kV

DC Power

Non Class 1 E

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NRC Question GTG - STARTING TIME (1/3) ý713P -4A

EPS starting time: 40 sec starting time for GTGsversus 10 sec staring time for Diesels

Why acceptable for LBLOCA and SBLOCA?

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NRC Question GTG - STARTING TIME (2/3) / "•

•System Design (Cont'd),/Advanced Accumulator

-Automatic switching of injection flow rate by flow damper-Integrates function of low head injection system-Long accumulator injection time allows longer time for safety injectionpump to start

Large flow rate Small flow rate

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NRC Question GTG - STARTING TIME (3/3) •

>CS pumps/Heat Exchangers used for RHRfunctions during shutdown

,/In current PWR plants, RHRS functions as the low head safetyinjection system (Common use of RHR and LHSI)

,/In US-APWR, the function of the low head safety injection(LHSI) is integrated into the Advanced Accumulator and safetyinjection pumps (SIP)

Comparison of Systemssystem US-APWR Current PWR

Cwvainent Spray System CSIRHRS CSS

Residual Heat Removal System CS/RHRS RHRSLHSI .

Low Hoed S•fety hInjecton System Advanced Accumulator RHRS4.HSIand SIP

Accumultor Injection System Advanced Accumulator Accumulator

High Head Safety IrI/etion System SIP SIP

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NRC Question -of GTG (1/6)

Governor and Excitation S--

- Discuss the excitation and governor systems ofthe gas turbine

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Governor(2/6)

TYPICAL OPERATION. TIMING CHART

S Typical Timing Chart Of Operation

NOteSupphed with QPS1250or largal rnodel

- 70% rpm iOo GPS250and GP8500

-70 sac. og G1PS250and GPS50D

The required time to confirm the black out.

LTD. 4GG-UAP-20080026-10

Governor(3/6) QUs- -1kP4

~z2a.

004 41001440~~~~

cI~~] ~

C® I507I1~0001040154b

10141 400 414 401 510911 1540

Ez~~1~ .4441 044 1w544954550.011

407014 41ne.~.2M1A

1404 4~50.0.0

ED 144,..54 15000 4414 954154*1 005 1540.

loflI 411145 40540911 1140.

C® 44-40

o-X lsvoslon.oonh400aooow

140 515400444as

110041414 1154. 0044444094041400e514-451 .t±1AS20405

k4051 - P401 4040455090401

5454440 I.4.0 ISIS

04.00541404400444.

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Governor(4/6)

GTO P-S

4GG-UAP-20080026-12

Governor(5/6)

FuelV-p

___-Erý Contrco Boy

0 Fu

02t

etConitra Vatve

i' Fuel PuripNory S~ý av

ver Set- peed fl5xd6 etMso

KIPo•

Gox e',rnor Systom

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Voltage Regulator (6 of 6)!AP]W

Brushless Exciter

/Eliminates maintenance associated with brush typegenerator field

> Permanent Magnet Alternator

/ Supplies continuous power to Voltage Regulatorv/ Superior motor starting capabilities

Static Voltage RegulatorV- Two AVRs supplied, manual and automaticv/ Voltage regulator motor operated potentiometersV Overexcitation protection/ Underfrequency/Overvoltage Protection

II

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NRC Question - Droop & Isochronous modesfor G TG (1/3)

/-US

> Droop Operation - GTG operating parallel to thegrid. Speed control is a governor function whichreduces the governor reference speed as enginefuel position (kW load) increases and vice versa,increases the governor reference speed asengine fuel position (kW load) decreases.

> Dsochronous Operation - GTG operating on itsSafety Related Bus. Isochronous speed control isthe ability to return to the original engine speedafter a change in kW load.

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NRC Question - Droop & Isochronous modes ... "

for GTG (2/3)

IEEE 387- 2001> 4.5.1.4 Governor operation

If the diesel engine is equipped to operate in both theisochronous and the droop mode, provisions shall be

included to automatically place the engine governorin the proper mode of operation when the dieselgenerator unit is required to operate automatically(see 4.5.2.2).

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NRC Question - Droop & Isochronous modesfor GTG (3/3)

IEEE 387- 2001

; 4.5.2.2 Automatic control

iii

Upon receipt of an emergency start-diesel signal, theautomatic control system shall provide automaticstartup and automatic adjustment of speed andvoltage to a ready-to-load condition.

.a) A start-diesel signal shall override all otheroperating modes and return control of the dieselgenerator unit to the automatic control system.

b) An emergency start-diesel signal shall notoverride any manual non-operating modes such asthose for repair and maintenance.

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NRC Question - Reliability Analysis (1/4)

A discussion on the Reliability Analyses

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NRC Question -Reliability Analysis (2/4) Q

More than 6000 units of GPS Gas Turbine serieshave been supplied in worldwide facilities. TheGPS Gas Turbine series had been developedaiming at Emergency or Backup generator usage.They are designed so that not only performancefor power operation may be ensured but alsoreliability required of emergency start beachieved.

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NRC Question- Reliability Analysis (3/4) -

GPS GTG Packages have industrial based fielddata available for estimating the startingreliability collected from starting eventsconfirmed, as shown in table 7.2-1.

V Number of Units 375/ Start Attempts 7394V Failed Starts 2

Based on the field data, starting reliability isestimated as below;

(1 - 217394) x 100 = 99.97%3.0 x 10-4 per demand

Sl3 TUSHUI-HEAVY.-!NDU ST R!ES, LTD. 4GG-UAP-20080026-20

NRC Question - Reliability Analysis (4/4)

> The probability'of failure to start of the EPS GTGis lower than that of any DGs (3.5 x 10- perdemand) as reported in NUREG/CR-6928"Industry-Average Performance for Componentsand Initiating Events at U.S. Commercial NuclearPower plant, February 2007".

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NRC Question - GTG Fuel

Fuel specifications for the gas turbine and howthey might differ from the fuel used in dieselgenerators.

:AEPS 4

The KHI GTG can use:a. #2 Diesel Fuel (low sulfur fuel)

b. Kerosene

A decision was made to use typical #2 Diesel Fuel.Therefore there is no difference between GTG andDG in the type of fuel used.

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NRC Question- Site Testing (1 of 3)

On-site testing requirements of RG 1.9, Positions2.2 and 2.3; RG 1.41, Position 1 and 2; andrequirements of Section 7, "Site Testing" of IEEE-387.

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NRC Question Site Testing (2 of 3)

Site Testing

QA A

/ IEEE 387 Section 7.2, RG 1.9 Section 2.2

" Site Acceptance Testing

" Pre-Operational Testing" Periodic Testing (ongoing)

/Tests occur at site after final assembly

v/ ESI simulates many of the tests at factory

v/ Final performance of site testing by utility withMHI/KHI/ESI oversight as required

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NRC Question Site Testing (3 of 3)

Rde-e,.se: T..t Site Pr. Ar flnbLUte 1e-t% Stt, m J.drp..denc,IEEE 387 ses-ptes.. rpretikn,,t (7.4.2.1) speeltie ttf

Cas:t~f, tests (Ss,.te~lse.) tests: t0 yr.s

(SW. (7..1)1 sbutd- o (7.4.L,)'MnI~thty 6 MoottO nt~elisg

57.4.7.2)*

77.+2 Stottiro X X

72.1.1 Losd x X

T2.L.1 tt8 4•a. d x X

7.'a14 Load Rgt~n. X

7.21.6 Subt x

7 3.3 Rediawflil, X

73.t. Startt X6 X

7.5.M Fted R-e X 76

7.5.3 Ft btS- 76 x

7.M,4 LOOP X x

75.5 SIAS 7

7.Z.6 C-tshin X 7

715.7 Soge -,Ld x X

7,5.8 DtiIntoad X 7

7.5.9 ad-cs -d Vo 7

7.5.!o Ho!etz x x

7 tt I S ho-i-g X X

73.5.12 Ptottttt-, trip x x

.5.t3 Test xdr X X

745.14 ltdeesd- X 7

SiUu 7 d. 2 b

/_037

I-- ý10IF

Table 1 taken from RG1.9 Rev. 3, & IEEE-387

I'll Ild 111-1111

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