ML20073R928

Forwards Response to NRC 940104 Request for Addl Info Re Simplified BWR Design.W/One Oversize Drawing

ML20073R928
Person / Time
Site:	05200004
Issue date:	02/03/1994
From:	Leatherman J GENERAL ELECTRIC CO.
To:	Borchardt R NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
References
MFN-012-94, MFN-12-94, NUDOCS 9402140044
Download: ML20073R928 (15)

Text

'4 GE Nucicar Energy :

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(. cewmuw : cem 175 Cwner As.nue, Ser Jue CA 95125 February 3,1994 ,

MFN No. 012-94 Docket STN 52-004 1

Document Control Desk '!

U.S. Nuclear Regulatory Commission Washington DC 20555 i

i Attention: Richard W. Borchardt, Director Standardization Project Directorate  !

Subject:

NRC Requests for Additional Information (RAls) on the Simplified Boiling Water Reactor (SBWR) Design 1

References:

Transmittal of Requests for AdditionalInformation (RAls) Regarding the SBWR Design, Letter from M. Malloy to P. W. Marriott dated January 4,1994 ' '

The Reference letter requested additional information regarding the SBWR design for use by j Pudue University to develop an SBWR prototype. In fulfillment of this request, GE is submitting -

Attachment 1 to this letter which contains responses to these RAls.

k Sincerely, ,  ;

o . ' (6t'pf4R) ,

J. E. Leatherman SBWR Certification Manager  :

MC-781, (408)925-2023 .;

. Attachment 1," Responses to NRC RAIs" cc: M. Malloy, Project Manager (NRC) (w/2 copies of Attachment 1) .;

F. W. Hasselberg, Project Manager (NRC) (w/1 copy of Attachment 1)

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i RAI Puidue #1 j Question:

In SSAR page 6.2-23 reference is made to Figure 21.6.2.2. which is to provide additional information on the design of the PCCS condenser. This ,

drawing' has not been provided to Purdue so we would like to request a-  !

copy of this figure r

i GE Response: {

The SSAR reference to Figure 21.6.2-2 on page 6.2-23 was made in error. i For further information regarding the PCCS condenser, please refer to the i data provided to Purdue during the meeting held' at Purdue 'on October 1, 1993 and the documentation of this meeting provided by.GE letter MFN No. ,

170-93, SBWR Test Program, P.W. Marriott to J.N. Wilson, dated October 20, 1993. ,

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ii Question: -

Please provide information on the gap size between the top of 'the core and .

bottom of the chimney sections. j i

GE Response:

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The chimney and partitions are supported by the top guide. . The gap  ;

between the top of the active fuel (TAF) and the bottom of the chimney- l sections is 443 mm. The gap between the -TAF and the bottom of the_ Top.-  ;

Guide is 265 mm. (See the attached sketch,-which shows the Chimney / Top Guide details.) j A

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. RAI Pu'rdue #3 ,

P Question:

Please provide detailed information such as design and location on the deflector plates on the DPV lines. Figure 21.1.2-2 SH 6 shows that the two  ;

DPV lines on the MSL do not have deflector plates.

GE Response: l The detailed specification and design of the jet deflectors- to be attached at the out.ets of the DPVs are designated as "SBWR commercialization activities" as opposed to "SBWR design certification activities".

Accordingly, GE-NE is not scheduling this work on the critical path steps [

leading to USNRC certification for the SBWR. The SSAR arrangement. .l drawing, Figure 21.1.2-2, SH 6, has the objective to show that nominal  ;

space at the outboard exit from each of the DPVs--whether mounted on main -steamlines er mounted off stublines connected to the RPV--does '

exist, and is reserved (by the showing of representative equipment at these exits) to reflect the needs for assembly, repair, jet dissipation, and the like.

The showing of a curved exhaust deflector in Figure 21.1.1 for the two DPVs attached to the' main steamlines indicates a proposed design approached that would direct the DPV. exhaust onto the reactor shield wall .;

which would, in turn, serve to, dissipate the jet. The' reactor' shield wall is.

amply strong to withstand this jet load .and no . vulnerable equipment is located nearby. This approach seems the most expedient, possibly, for these two DPVs as they are located relatively close to the reactor shield  !

wall. For the other four DPVs located at the end of the stublines, a -

different solution is being anticipated wherein the. jet is simultaneously turned and dissipated, much. like the thrust-reversers used on aircraft jet. '

engines. ,

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i RAI Purdue #4 i

Qucstion:

Please ' provide detailed information on the SRV spargers such as nozzle .;

diameter number of nozzles etc... Also provide information on ~ the spargers  !

located on the non-condensable vent lines 7

GE Response:

SRV Quencher details are provided in the attached draft SBWR Quencher drawing.  ;

The present reference design for the PCCS vent is an open; ended pipe >

terminating .beneath the suppression pool surface at a distance of 0.85.m. j' above the top tangent of the uppermost horizontal vent. The pipe-end sparger shown in the August, 1992 SSAR (Figure 21.6.2-1) has_-been -

removed, and the ventpipe termination (for each of the three. PCCS .

condensers) has been relocated to a position adjacent to the drywell vent ,

wall. These changes represer design upgrades under 'which the SBWR PCCS system design is further simplified--through not requiring the sparger at all; plus,. at its new position adjacent to th6 vent wall and away from the containment wall, the dynamic loads . produced on vent wall, -

containment wall, and on in-pool submerged piping and' structures all-become negligible .with respect to the dynamic loads produced on these ,

components by .the underwater vent system during LOCA blowdowns .and . l' for which these components are conservatively designed. -It- is worth noting that this configuration (with no sparger) is consistent - with~ the way ~

the containment pressure / temperature LOCA. calculations are' being made for the SSAR. j

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RAI Purdue #5  !

- Question: i In Figure 21.6.3-2 note 6 of the SSAR it is mentioned that GDCS pools A l' and B are connected to the PCCS pools A and B respectively, however there is no mention of GDCS pool C. Please clarify.  ;

i GE' Response: ,

The Passive Containment Cooling System (PCCS) heat exchangers are_

connected to GDCS pools A and C (270 & 90 ). Note 6 on SSAR Figure 3 21.6.3-2 is in error and will be corrected. GDCS pool B -(180 ) is not  :

connected to any PCCS. -l l

In the earlier design, there were only two PCC heat exchangers and. they i were located in cells over GDCS pools A and C. When the third PCC l condenser was added, it had to be placed in one' of the open cells that'was ,

not already occupied by one of the original two PCC condensers or the i three Isolation Condensers (ICs). The most practical locatian .was to use .a '!

cell located over the GDCS A pool. Therefore, there are two PCC condensers I connected to pool A and one connected to pool C with no PCCS connection to  :

poo(B. The GDCS pools are interconnected so that any addition to one of ,

the pools would be distributed _ over all three of the GDCS pools. There is no functional requirement to_ assign each PCC condenser to a different GDCS  !

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i RAI Purdue #6 i

Question. .

Detailed information on the ' opening area at RPV skirt connecting the upper-  !

and lower drywell is needed. '!

GE Response: j The RPV skirt type support design is in the process of being changed to a .

sliding type support design. This change is being made ~ in order. to minimize the adverse effects of high neutron fluence at the RPV skirt.

Upon GE Technical Integration group approval of this design change, the ,

RPV detail drawings will be revised to show the sliding type support details. Preliminary detailed information on the sliding support ,

configuration and the insulation arrangement at the . RPV support are  :

provided in the attached Figures 1 through 4. 1 The opening area at the RPV support connecting the upper and lower drywell is shown in Figure 2. In addition, there are 14 vents built into the  !

RPV support structure which connect the upper and lower drywell regions.  ;

The attache'd Figures 5 and I2 from GE- document No. 25A5044, provide the vent details.  :

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