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

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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 i

Washington DC 20555 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 -

- to this letter which contains responses to these RAls.

k Sincerely,

' (6t'pf4R) o 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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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:

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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.

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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.)

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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

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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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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.

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- 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.

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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 pool.

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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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