ML20115F522

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Forwards Sbwr RFP Info,Consisting of Draft Response to NRC 920828 Questions
ML20115F522
Person / Time
Site: 05200004
Issue date: 09/11/1992
From: Baechler J
GENERAL ELECTRIC CO.
To: Poslusny C
NRC
References
PROJECT-681A NUDOCS 9210230118
Download: ML20115F522 (19)
v • d • e


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DRAFT Responce to NRC Ouestions 8/28/92 NRC Question 1.

Table 1 lists the SBWR dlmerisions based on an earlier design. Please revise Table 1 for the current GBWR i

design.

GE Response Section I Condensers Isolation PCCS Parameter Condenser Condenser

~ lube Length 1.8 m 1.8 m o

Tube ID 46.6 mm 47.5 mm g

Tube OD 50.8 mm 50.8 mrn

  1. of Tubes 120 248 Tuoc Pitch 100 mm 80 mm (trianguler) 113.2 mm 107.7 mm 113.2 mm 107.2 mm Section 11 Vessels

~RPV Hel0ht 24.6 m RPVID 6.0 m RPV Volumo 607 m3 j

(free)

RPV Volume 669 m3 (total)

Suppression 6074 m3 i

i Chamber i-Volume (previously l

calleo Wotwell )

Drywell Lower 888 m3 Volume Drywell Upper 4581 m3 l

Volume I

GDCS Poo!

Soo response L

Volume to question 3.

l L

L Page 1 of 7-

EEf. !'

' ' " AM GE !!WLEAP AIR ItS)H f. :.1)

DRAFT Response to NHa Questions 8/28/92 Section til Piping See P & ID for the Isolation Condenser System in the SBWR SSAR, Figure 21.5.41.

Parameter Dimension A ~~ IC Steam Line 10 in Schedulo 80*

See isometric for length B.

IC Drain Line 6 in Schedule 80S' See isometric for length C.

IC Vent Line 3/4 in Schedule 80S' See isometric for length D.

RPV Equallration Line 6 in Schedule 80S' Len0th 8.574 m Number of Unes 3 E.

Suppression ID 509 mm (20 in)

Chambst to Drywell OD Not applicable Vent vacuum breaker Number of Lines 3 linn Length 900 mm F.

Upper Drywell to These vents have been-Lower Drywell Vent deleted. The upper and t.ines lower drywell are now in communication with each other.

G.

IC Vessel Nozzle size 18 in @ vessel,10 in branch See isometric for length H.

Orain Line Nozzle size 6 in 1.

Vent Line Nozzle Size 3/4 in See Crane's Flow of Fluids (or similar document) for ID and OD Yase 2 of 7

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DRAFT Response to NRC Ouestions 8/28/92 4

NRC Ouestion 2.

Figure 1 shows a sketch of the SBWR vessel. Please provida:

a)

Inside diamotors of the vessel (1), core shroud, and chimney (G). (Note that the number in parenthesis corresponds to that in Fig.1.)

h)

Elevations (above the lowest point on the inner surface of vessel bottom) of core plate (14), bottom of activo fuel (B AF), to) of activo fuel (TAF), core top guida plate (12), top of ch'mney, top of steam separators (3),

top of the vessel, and various nozzles at the vessel (4,5, 7, 8, 9).

c)

Total coolant flow area in the core: (1)inside fuel channel boxes, (2) outside channel boxes with the presence of control blades, and (3) outsido channel boxes without the presence of control blades.

d)

Total coolant flow area in the chimney region.

Number of divided flow areas in the chimney, n)

Axlal pressure drops and loss coefficients across CRD housings (15), core plate (14), core with and without control bladeF (13), core top guide plate (12), chimney (6), steam separators, and steam dryer at normal ooeration.

GE Response a)

Insido diamotors:

Vessel = 6000 mm (minimum)

Core shroud = 5150 mm (nominal)

Chimney = 4955 mm (nominal) n h)

Elevations (referenced from vescol zero, inside bottom):

I Core plate = 3523 mm (top of plate)

Bottom of Active Fuel (BAF) = 3750 mm Top of Activo Fuel (TAF) = 6493 mm Core top guido plato = 6936 mm (top of plate)

Top of chimney - 15996 mm (flange top)

Top of separators = 19364 mm Top of vessel = 22536 mm (to closure flango)

Main steam lino nozzio = 20380 mm 1

Page 3 of 7

?EP.1!

!1il;ui 6E llTLEl.P Alit W M i.' 19 DRAFT Response to NRC Questions 8/28/92 DPV nozzle = 19935 mm Feedwater inlet nozzle = 16455 mm RWCU/SDC suction nozzio = 15755 mm IC return nozzle = 12065 mm c)

(1)

The total flow area inside the fuel channels is 7,4 m2 (2)

The total flow area outside the fuci channels is 5.6 m2 with control rods inserted.

(3)

The total flow area outside the fuel channels is 5.6 m with control rods withdrawn, e

Total coolant flow area in chimney roulon at mid-d) elevation of chimney = 18.94 m2 (see sketch 1, section A A)

Total coolant flow area in chimney region at lower flange = 18.154 m (see sketch 1, section B 0) r Number of divided flow areas in the chimney = 26 (see sketch 2) o)

In eddition to the iniormation given below, refer to the response to question 4 in a letter P W. Marriott to P.,C.

Pierson, Request for Additional SBWR Des!On Information, dated April 20,1992, MFN 096 92.

Pressure flow Path Drop (Pal Loss Coeffic%nt Across lower 5240 K.9 per CRD guica tube row, planum 83% obstructed K=.4 per CRD housing row,65%

obstructed Core plate 6400 A/K.036 m2 Core (with and 48,200 Multiple two phase losses without control blades)

Top guide 600 K-1, essociated area-1.7m2 Chimney 31,700 K-0 Steam GE GE Proprietary l_

Seperators Proprietary

(.

Steam oryer 2500 K-165, associated area-28.8 m2 NRC Ouestion 3.

Figure 2 shows a sketch of the PCCS. Please provide; a)

' Elevations of IC pool water surfacs (y ), and top and g

bottom of the pool structr 3 (yg and y7); Initial water l

Page 4 of 7-

2U.11

, :!: AM GE IFJ0 LEAP Alief h % % P./ D j,

DRAFT Responsa to NRC Questions 8/28/92 volume and temperature in the pool: initial volume of aus space; radial dimensions of the pool, b)

Same information for each of thsee Independent GDCS pools (y4, y6'Yo, etc.).

c)

Same Information for the suppression pool (yg, Y2< Y3, ate.).

d)

Elevations of the bottom of GDCS drain line at the i

GDCS pool (y3o), the top of GDCS drain line nozzle at i

the vessel (y33), and the top of IC condensate drain line at the vessel (y12)-

e)

Elevations of the top of equalization line (y33), PCC vent line outlet in S/P (yg), the top and bottom of the highest S/P horizontal vent (y16, Y16), and 10 vent line outlet in S/P (y37).

GF Rosponco Elevations labolod on Figure 2:

~

Label Elevation (mm)

Y1 4050 Y2 10050 @ LWL Y3 18600

[

Ya 17200 Y5 22700 @ LWL Y6 23300 Y7 25300 Y8 29700 Y9 31100 Y10 17600

~

Y11 9493 Y12 12005 Y13 7493 Y14 9300 Y15 8500 Y16

.7800 Y17 9300 Page. 5 of 7 t-

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DRAFT Response to NRC Queutions 8/28/92 -

s 6

IC/PCCS-GDCS Suppression Parameter Pool Pools Chamber i

Initial Water 3616 m3 1044 ma 3256 m2 Volume Total Total Total

@ NWL

@ NWL Initial 102 C 57 C 43 C -

Temperature 215 F 135 F 110 F (Analytical)

Initial Volume 1162 m3 93 m3 3819 m3 of the gen Total Total space

@ NWL

@ NWL Dimensions of See SBWR See SBWR 15.6 m ID j

the pool SSAR SSAR 31.5 m OD i

Figure Figure 5.45 m

^

21.1.2 2 21,1.2 2 Depth Sheet 4 Sheet 8 NRC Guestion 4 Figure 3 shows a different sketch of PCCS.

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-)

Are piping dime $sions correct 7 b)

Please provide PCCS driving head ( :: y34 y15 n Fig. 2).

I l

GE Response a)-

Yes, the piping dimensions shown;in too figure are correct.

b) yu ya in Fig. 2 is equal to 0.85 m.

NRC Ouestion 5.

Figure 4 shows the SBWR Nuclear Boiler Systern (NBS),

Please provide:

a)

Elevations of six GDCS injection nozzles (6" size) at the vessel.

Elevations of four DPV stubs (12" size) at the vessel.

b)_

c)

Flow' area and loss coefficient for the flow restrictor on a steam line.

d) - Are piping dimensions correct 7 GE Response a)

The centerline elevation of all nozzles is 9493 mm above RPV vessel zero, b)

The conterline elevation of all stub lines is 19935 mm obove RPV vessel zero.

'Page 6 of 7 -

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li'0 M f* 6 9 DRAFT Response to NRC Questions 8/28/02

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c)

The flow restrictor diameter is 353.8 mm and the loss coefficient is GE proprietar/ (included under separate 4

cover). See previous response to the responso to question 6 in a letter P.W. Merriott to R.C. Pierson, Request for Additional SBWR Design Information, dated April 20,1992, MFN 095 92.

d)

The DPVs no longer have discharge lines as shown in Figure 4. Additionally, there is no RWCU/SDC connection to the RPV head spray line. For more i

information, refer to SBWR S$AR Figure 21.5.4 2.

NRC Ouestion 6.

Table 2 lists SBWR system automatic action setpoints. ls the table coirect ?

I GE Rosponse Dolow is an updated Table 2. These sotpoints are Analytical Limits. Refer to Table i5.01 in the SBWR SSAR.

I Elevation Affected I

Level mm Component Action S

19364 Feedwater Pumps Trip -

8 18790 Control Rods Scram Main Turbino Trip Feedwater Pumps Runback to minimum flow CRD injection Trip mode Normal 18260 None None Water Level 3

17255 Control Rods Scram Leak Detection and initiates Isotation System.

RWCU/SDC Pump -

Runback to Minimum flow 2

13595 MSIVs Close ICS Initiates CRD injection Initiates with 130 s mode delay Alternate Rod Actuation Insertion (ARI)

RWCU/SDC System isolation i

10095 ADS Valve openings 4 S/RVs @0s 4 $/RVs @ 10s 2 DPV

@ 56 s 2 DPV.

@ 100s 2 DPV

@ 145 GDCS Initiates Note:

For Bottom of Active Fuel (8AF) see response to.

Question 2, item b.

Page 7 of.7

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