ML20035D830

Forwards Response to NRC 930128 Request for Addl Info on Simplified BWR Design

ML20035D830
Person / Time
Site:	05200004
Issue date:	04/09/1993
From:	Marriott P GENERAL ELECTRIC CO.
To:	Borchardt R NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
References
MFN-052-93, MFN-52-93, NUDOCS 9304140050
Download: ML20035D830 (21)

Text

,'

GENuclearEnergy t

Cc e:SIa c (om;ry

~

April 9,1993 MFN No.052-93 Docket STN 52-004 4

i r

Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention:

Richard Borchardt, Acting Director Standardization Project Directorate

Subject:

NRC Requests for Additional Information (RAIs) on the Simplilled Boiling Water Reactor (SBWR) Design

Reference:

Transmittal of Requests for Additional Information (RAls) for the SBWR Design, Letter from J. W. Thompson to P. W. Marriott January 28,1993 The reference requested additional information on the SBWR Design. As part of the response to this request, GE is submitting responses to the following RAls:

1)

RAls No. RES.1 through RES. 8 i

Sincerely,

'Ak P. W. Marriott, Manager Safety & Licensing M/C 444, (408) 925-6948

Enclosure:

RAI Responses l

I LTIWK 93 20 130091 930414ooso 93o4o9

.pgi PDR ADOCK 052o0004 I

l A

PDR j

~

c

.. i bec:

L C. Baechler R. H. Buchholz S. A. Delvin

]

D. M. Gluntz R. J. McCandless A.S.Rao G. M. Sweden SBWR File MC-781 I

i

)

i P

1 i

l i

1 I

1 i

1

)

I J

i j

i.

i LTRBK 9k20 1

1 j

N (I AI. NumbIr: RES.1 Rasp:n:Ibl3 Enginr.r: MALTE, B.

What is the basic PGCS capacity (per unit) produced by stum condensation in ths tubes (no flow from dryw:tl to przssura suppression pool via the PCCS vent line, no noncondensable gas in the drywell atmosphere, and IC or PCCS pool temperature at its initial value)? What is the drywell pressure associated with this basic capacity?

l I

~

4 QE RNp nso:

RES.1 The.PCCS csndensers w:re siz:d on the basis of saturit:d conditions in tha IC/PCC pool. For pura siturit;d stum, the hxt r:moval rate of the PCCS condenser at a drywell pressure of 350 kPa (50.7 psia) and pool temperature of 100'C (212*F) is 10 MW i

The basic PCCS capacity has also been calculated for a pool temperature of 50*C (122*F) and a drywell pressure of 350 kPa. The heat removal rate at these conditions is calculated to be 23.9 MW i

l I

}

I l

i Applicable Text Amendment Section No.

Tier 17 Revision? Number 6.2.2 No No Response Document

7 RAl Numb:r: RES.2 R spensibla Enginscr: MALTE B.

[

How does the b: sic PCCS capacrty defined in Question RES.1 decracda's~lC/PCCS pool 1:mperatura increases over the range from its initial temperature to saturation temperature?

i f

c i

I i.

i

GE B::sponoo:

RES.2 Sze respons'e to RES.1.

l i

i s

l i

t f

i l

i 4

i i

l l

s a

1 l

4 Applicable Text Amendment i

Section No.

Tier 17 Revision? Number 6.2.2 tJo tJo i

Response Document

RAI NumbIr: RES.3 R:sp:n?lbl3 Engint:r: MALTE, B.

How does th'e basic PCCS capacity defined in Question RES.1 increase as the drywell-to-suppression chamber d:fterential pressure increases from 1.05 osid (initiating flow through the vent line) to 2.30 psid (initiazing flow through the upper row of horizontal vents)?

i h

4 f

I h

I i

t

GE Radpsnto:

RES.3 Th3 PCCS ctpicity was dettrmined for pura st:Im ct a drywIll pressure of 350 kPa and drywill-to-suppr:ssion ch mber dift:r:ntial pressures of 7.5,15.4, and 23.4 kPa (1.09,2.23, and 3.39 psid). For an IC/PCC pool temperature of 50*C, the PCCS condenser has l

sufficient capacity so that over the range of differential pressures considered the heat removal rate does not vary. The heat removal rate is 23.9 MW For a pool temperature of 100*C, the heat removal rate increases with differential pressure. The PCCS capacity is:

i 10.0 MW @ AP = 7.5 kPa 10.6 MW @ AP = 15.4 kPa i

10.7 MW C AP = 23.4 kPa.

e i

e i

e i

t i

I t

+

l t

I I

1 L

i 3

3 t

i l

l Applicable Text Ainendmont Section No.

Tier 17 Revision? Nui..Wr 6.2.2 No No Response Document

'l

-l

RAI NumbIr: RES.4 R:sp:nsibl2 Engin r: MALTE, B.

How does the basic PCCS capacity defined in Question RES.1 decrease as the noncondensable gas fraction at the PCCS inlet increases?

i i

L

+

l l

GE R::panco:

RES.4 Th3 vanatioriot th3 heat removal rate of the PCCS condenser with ini?,1 noncondensible gas miss fraction was det rmined for a drywell pressure of 350 kPa and a drywell-to-suppression chamber pressure differential of 15.4 kPa. The results for IC/PCC pool temperatures of 50 and 100*C are given in Tables 1 and 2, respectively. The corresponding results are shown in Figure 1.

l t

Applicable Text Amendment

,,i" Section No.

Tier 17 Revision? Number 6.2.2 No No RES.4 Figure 1 Response Document

a Table 1 PCCS Performance as a Function ofInlet Gas Slass Fraction

.l for IC/PCC Pool Temperature = 50*C 7

i i

Inlet Gas PCC Capacity l

Sfass Fraction Watts 0.0 2.39e7 '

i

.011 1.60e7 l

.044 1.41e7

[

.086 1.27e7 i

.167 1.10e7 j

.244 9.63e6 t

.316 8.40e6

^

.384 7.30e6 -

.448 6.32e6 l

.509 5.43e6

.567 4.63e6

.622 3.91e6 l

.675 3.26e6 I

{

.725 2.66e6

.772 2.10e6

.818 1.58e6 j

.862 1.09e6 i

i

.903 6.5 eea j

j

.943 2.82e5

.981 1.30e4 i

1 Ia ti Pow = 350 kPa i

i I

APDW/WW = 15.4 kPa a

i 1

?

+

Table 2 PCCS Performance as a Function of Inlet Gas Niass Fraction for IC/PCC Pool Temperature = 100 C Inlet Gas PCC Capacity Niass Fraction Watts 0.0 1.06e7

.011 1.00e7

.044 8.19e6

.086 7.27e6

.167 6.16e6

.244 5.27e6

.316 4.51e6

.384 3.80e6

.448 3.14e6

.509 2.54e6

.567 1.98e6

.622 1.47e6

.675 9.82e5

.725 5.45e5

.772 1.61e5 P w = 350 kPa 9

.iPDW/WW = 15.4 kPa i

1 i

I

.~

Figure 1 PCC PERFORMANCE AS A FUNCTION OF INLET GAS MASS FRACTION 25E+6 P = 350 KPa

.1P = 15.4 KPa 20E+6 I

l

$ 15E+6 eb tc 0 10E+6 k

\\

1 l

Tpool = 50"C 05E+6

\\

Tpool = 100"C 00E+6 0.0 0.2 0.4 0.6 0.8 1.0 INLETGAS MASS FRACTION

RAl Numb:r: RES.5 Rrp ncibla Engin0cr: MALTE, B.

What are the expected sensnivnes (if any) to the composnion of the noncondensable gas?

I h

i i

i t

i i

h i

t

?

i I

h

'l GE R:sp:n:3:

RES.5 The. eft;ct ori tube condensition of st;1m in the presene) of noncondens E) gases. Tests w;o performed with cir rnd hehum, which cet similarly to nitrogen and hydrogen, respectively. The results indicate that has been studied in the reference for the same mole fraction, air reduces the rate of heat transfer more than helium. While for the same mass fraction, helium reduces the rate of heat transfer more than air. The d;fderence between the effects of hel:um and air decrease with increasing noncondensable mass fraction.

REFERENCE:

"The effects of noncondensable gases on steam condensation under forced convection conditions", Siddique, fA. PhD.

d:ssertation. MIT,1992.

f Applicable Text Amendment Section N o.

Tier 17 Revision? Number 6.2.2 No No Response Document

AAl Numb:r: RES.6 Rrpen21bt) Engineer: MALTE. B.

Whst is the Inickness of the gravity-driven cooling syst:m pool w::.lis et tha int:rfica with the dryw ll ttmosph rs? Par SSAR Sectron 3.8.3.1 these are "made of stainless steel plates or carbon steel plates lined with stainless steel cladding and backed up with vertica!

and honzontal steel structural framing system."

l 4

f l

P n

}

l i

f 1

1 b

f

GE 83cpon20:

RES.6 The thickness of the GDCS pool walls at the intzrface with the drywell is 16 mm (5/8 in) carbon steel with additional ctrinless steel cladding.

i i

d i

5 i

4 I

i i

Applicable Text Amendment Section No.

Tier 17 Revision? Number 3.8.3.1 No No Response Document

RAI Numb 2r: RES.7 R20p:n:Ibl3 Engineer: MALTE, B.

~

What is the 'hickness of the (water-cooled) drywell head?

t I

b 4

1 i

b i

S i

i

?

i f

A GE RdpsnOs:

RES.7 The thickness and desenption of tha (water-cool:d) drywrtl h:2d is as follows:

The drywell head consists of a 2:1 ratio, semi-elliptical vessel head welded to a vertical right cylinder with a f!ange welded to the bottom of the cylinder. The mating fiange is welded to a vertical right cylinder which projects from the diaphragm floor. The semi-elliptical head is 40mm thick, the vertical right cylinders are 50mm thick and the flanges are 100mm thick by 250mm wide.

+

i f

B Applicable Text Amendment Section No.

Tier 17 Revision? Number 3.8.1.3 No No Response Document l

e

.RAI Numbir: RES.8 R;cp:n:lbia Enginscr: MALTE, B.

Wh.at is the thickness of tha fines in the pressura suppression ch:mber tirsp2o37 Par SSAR S:ction 3.8.3.1, these " project down 1.0 m (3'-3") below the 0.6 m (2'-0") thick floor....The radial plate, with a flange plate at the bottom, forms the support beam to the floor system.' Figure 21.1.2-2 Sheet 9 (Reactor Building, Plan at Elevation 16000) shows that there are 24 of these fans.

s 1

I i

i

6.

GE R[sptn23:

RES.8 The thbkness of the fins which proj:ct below tha diaphr+gm floor is 25 mm (1 in) The dim:nsions of the flinge plate Ct the bottom of th3 fins is 540 mm x 38 mm (21 in x 1-1/2 in) l t

I i

o 1

l Applicable Text Amendment Saction No.

Tier 17 Revision? Number 3.8.3.1 No No Response Document 1