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Category:CORRESPONDENCE-LETTERS
MONTHYEARML20248E1991998-05-28028 May 1998 Informs That Staff Has Identified Six Ltrs (Enclosed) to GE Re Potential Proprietary Disclosure.Ltrs Specifically Requested That GE Review Encl to Determine If Contained GE Proprietary Info.Encl Withheld ML20247R4901998-05-20020 May 1998 Informs That Encl Staff Rept That Was Attached to Has Been Reviewed & Contains No GE Proprietary Info.W/O Encl ML20247M6911998-05-18018 May 1998 Forwards Staff Review of Rept, Giraffe Sbwr Sys Interactions Test Rept, (NEDC-3254OP,Revision-0).Informs That Review of Sbwr Was Terminated in 1996 ML20247M7021998-05-18018 May 1998 Forwards Staff Review of General Electric Panthers - IC Test Rept (Siet 00458RP95).Informs That Sbwr Was Terminated in 1996 ML20134L3181996-11-19019 November 1996 Advises That GE Pathers/Ic ATRs Submitted w/951025 Ltr Will Be Withheld from Public Disclosure Ref 10CFR2.790,based on Review of Listed Reasons for Maintaining Info as Proprietary ML20134F3861996-11-0101 November 1996 Ack Receipt of Informing NRC of Steps Taken to Correct Violations Noted in Insp 99900403/96-01 on 960708 ML20134D6271996-10-25025 October 1996 Provides Sbwr - Panthers/Ic Apparent Test Results,Phase 1 Affidavit Supporting Request to Withhold Info from Public Disclosure ML20129C2881996-10-21021 October 1996 Informs of Review & Determination That Info Identified in Apparent Test Results Contain Trade Secrets or Proprietary Commercial Info & Will Be Withheld from Public Disclosure ML20128M7491996-10-11011 October 1996 Provides Affidavit to Tests & Requests That NRC Accepts Request to Withhold Sbwr Panda steady-state Test S10-S13 Pcc Performance from Public Disclosure ML20128H4971996-10-0707 October 1996 Advises That GE Giraffe Sys Apparent Test Results Repts Will Be Withheld from Public Disclosure Ref 10CFR2.790,per 960321 Request ML20128H5141996-10-0707 October 1996 Informs That Licensee 951212 Request That GE Panda steady- State Tests S1 Through S6 Pcc Performance Apparent Test Results,Rev 1 Be Withheld from Public Disclosure,Per 10CFR2.790,granted ML20128H5301996-10-0707 October 1996 Informs That Licensee 960314 Request to Withhold GE Girafee Helium Tests Apparent Test Results Repts & Data Transmittal for Giraffe Helium Tests H3 & H4 from Public Disclosure,Per 10CFR2.790,granted ML20129F5031996-10-0303 October 1996 Advises That Info Submitted in 960109 Rept Entitled, Post-Test Calculations of Panda Pcc Steady-State Test, Will Be Withheld from Public Disclosure,Per 10CFR2.790(b)(5) & Section 103(b) of AEC of 1954 ML20129F5061996-10-0303 October 1996 Advises That Info Submitted in 960109 Rept Entitled, Panther/Ic Apparent Test Results Phase 3, Will Be Withheld from Public Disclosure,Per 10CFR2.790(b)(5) & Section 103(b) of AEC of 1954 ML20129E8831996-10-0202 October 1996 Informs That GE Panda Steady-State Tests Data Transmittal Rept Will Be Withheld from Public Disclosure,Per 10CFR2.790 (b)(5) & Section 103(b) of AEA of 1954,as Amended ML20129F6181996-10-0202 October 1996 Advises That Giraffe Sbwr Sys Interactions Test Rept Will Be Withheld from Public Disclosure Ref 10CFR2.790, Per 960617 Request ML20129F6341996-10-0202 October 1996 Advises That Panthers/Ic Atrs Will Be Withheld from Public Disclosure Ref 10CFR2.790,per 960222 Request ML20129G5841996-10-0202 October 1996 Advises That,Data Transmittal for Giraffe Helium Tests H1 & H2,as Requested by Will Be Withheld from Public Disclosure Per 10CFR2.790(b)(5) & Section 103(b) of 1954 AEA ML20129E6361996-10-0101 October 1996 Advises That GE Panda Transient Integral Test Data Transmittal Repts Will Be Withheld from Public Disclosure Ref 10CFR2.790,per 960816 Request ML20129E8681996-10-0101 October 1996 Informs That Licensee 960222 Request to Withhold GE Panda Steady-State Tests S10-S13 Performance from Public Disclosure Per 10CFR2.790.Request Denied Because No Affidavit Was Submitted ML20129G6311996-10-0101 October 1996 Advises That Giraffe Helium Series Test Rept,As Requested by Will Be Withheld from Public Disclosure Per 10CFR2.790(b)(5) & Section 103(b) of 1954 AEA ML20248F3891996-07-31031 July 1996 Forwards Rept on Staff Evaluation of GE Tracg Model Description,Rev 1,related to Containment Area,In Response to ML20115D0441996-07-11011 July 1996 Forwards Nonproprietary NEDO-32608, Giraffe Sbwr Helium Series Test Rept. Proprietary Rept Submitted by GE ML20115C4601996-07-0808 July 1996 Addresses Nonconformances Noted in Insp Rept 99900403/96-01 Re Panda Testing.C/A:Apparent Test Results Repts (ATR) Which Contains All Info Specified in ATRs in Test Spec & Test Plans Issued for Listed Tests ML20113C2071996-06-27027 June 1996 Forwards NEDO-32540, Giraffe Sbwr Sys Interactions Test Rept ML20113B5661996-06-24024 June 1996 Forwards Proprietary Test Rept for Giraffe Helium Series Tests.Test Procedures & Instrumentation Drawings Encl.Encls Withheld Per 10CFR2.790 ML20113A0111996-06-17017 June 1996 Forwards Proprietary Rev 0 of NEDC-32540P, Giraffe Sbwr Sys Interactions Test Rept. Transmittal Satisfies Items 38 & 39 of GE Re Updated Status of Test Documentation Submittals.Encl Withheld (Ref 10CFR2.790) ML20112J0791996-06-14014 June 1996 Forwards Proprietary Version of Rev 0 to 00458RP95, PANTHERS-IC Test Rept. Rept Prepared for GE by Siet S.P.A Under Contract to Enea.Rept Withheld from Public Disclosure Per 10CFR2.790 ML20117M9651996-06-14014 June 1996 Forwards non-proprietary Rev 0 to Siet 00458RP95, PANTHERS-IC Test Rept ML20117K7091996-06-10010 June 1996 Requests 30 Day Extension Until 960710 to Respond to NRC Re Nonconformances & Unresolved Items Noted in Insp Rept 99900403/96-01 on 960305-08 ML20112G6711996-06-0707 June 1996 Forwards Responses to NRC Questions & Comments Re Rev 1 of GE Scaling Rept NEDC-3228P, Scaling of Sbwr Related Tests ML20117H4561996-05-22022 May 1996 Clarifies Charges for TAC M84214,GE Sbwr - RAI - Initial Test Program (Chapter 14) on Invoice XM0439-96,dtd 960429 ML20117F5711996-05-14014 May 1996 Requests That Je Leatherman Be Removed from Svc List & Rh Buchholz Be Added ML20108B8451996-04-26026 April 1996 Requests Addl Review of Repts by Nrc,Per Input Provided by Domestic & Intl Utils to Go Further than Indicated in GE 960304 & 13 Ltrs W/Efforts on Tracg Qualification for Sbwr Application.Utils,Epri & GE Desire to Meet W/Nrc on 960528 ML20107A4681996-04-10010 April 1996 Requests Copies of English Translations of Repts on Par, to Facilitate Sbwr Review ML20101Q6961996-04-10010 April 1996 Forwards non-proprietary Apparent Tests Results (ATR) Repts for Helium Tests & tie-back Tests ML20101F8871996-03-21021 March 1996 Forwards Proprietary Apparent Test Results Rept (ATR) Sys Interaction Tests (Sit).Proprietary Repts Withheld (Ref 10CFR2.790) ML20101F2981996-03-20020 March 1996 Forwards Latest Revs of Panda Project Control Plan & QA Procedures ML20101B7591996-03-14014 March 1996 Advises That GE Redirecting Focus of Simplified BWR Programs from Plants of 670 Mwe Size to Plants of 1,000 Mwe or Larger ML20101C4731996-03-14014 March 1996 Forwards Proprietary & Nonproprietary Apparent Test Results Rept for Four Helium Tests & Two tie-back Tests.Proprietary Repts Withheld Per 10CFR2.790.Affidavit Encl ML20101B7381996-03-13013 March 1996 Discusses Redirecting Focus of Sbwr Programs from 670 Mwe Size to 1,000 Mwe or Larger Size Plants Reducing Activity Level on Tracg Effort as It Applies to 670 Mwe Plant ML20101B7501996-03-12012 March 1996 Discusses Sbwr Closure of Vacuum Breaker Test Program ML20100N9301996-03-0404 March 1996 Informs That GE Redirecting Focus of Sbwr Program from Plants of 670 Mwe Size to Plants of 1,000 Mwe or Larger. Listing of Open Activities,Desired Closure Objective & Schedule Encl ML20101B8011996-02-26026 February 1996 Discusses Sbwr Re NRC Site Visit & Insp to Panda,Ansaldo & Dodewaard ML20100J0321996-02-23023 February 1996 Submits non-proprietary Sbwr Highlights & GE Slides from NRC 960215 Meeting ML20100J0141996-02-23023 February 1996 Forwards Proprietary Sbwr Highlights & GE Slides from NRC 960215 Meeting.Encl Withheld ML20097F7101996-02-15015 February 1996 Forwards Sbwr Status & Schedule 960214 & Payments Made to NRC for Last Four Yrs,In Response to Ref Telcon Requests ML20149K0521996-02-15015 February 1996 Forwards Proprietary Test Results for Giraffe Helium Tests H1 & H2.Attachment 1 to Ltr Provides List of Instruments Included on Computer Disk.Encl Withheld (Ref 10CFR2.790) ML20100J4041996-02-12012 February 1996 Transmits Proprietary Rev 1 to Licensing Technical Rept NEDE-32176P, Tracg Model Description Open Items.Encl Withheld ML20100G8361996-02-12012 February 1996 Forwards Proprietary Rev 1 to Topical Rept NEDE-32176P, Tracg Model Description. Rev 1 to Topical Rept NEDE-32176P Withheld 1998-05-28
[Table view] Category:OUTGOING CORRESPONDENCE
MONTHYEARML20248E1991998-05-28028 May 1998 Informs That Staff Has Identified Six Ltrs (Enclosed) to GE Re Potential Proprietary Disclosure.Ltrs Specifically Requested That GE Review Encl to Determine If Contained GE Proprietary Info.Encl Withheld ML20247M6911998-05-18018 May 1998 Forwards Staff Review of Rept, Giraffe Sbwr Sys Interactions Test Rept, (NEDC-3254OP,Revision-0).Informs That Review of Sbwr Was Terminated in 1996 ML20247M7021998-05-18018 May 1998 Forwards Staff Review of General Electric Panthers - IC Test Rept (Siet 00458RP95).Informs That Sbwr Was Terminated in 1996 ML20134L3181996-11-19019 November 1996 Advises That GE Pathers/Ic ATRs Submitted w/951025 Ltr Will Be Withheld from Public Disclosure Ref 10CFR2.790,based on Review of Listed Reasons for Maintaining Info as Proprietary ML20134F3861996-11-0101 November 1996 Ack Receipt of Informing NRC of Steps Taken to Correct Violations Noted in Insp 99900403/96-01 on 960708 ML20129C2881996-10-21021 October 1996 Informs of Review & Determination That Info Identified in Apparent Test Results Contain Trade Secrets or Proprietary Commercial Info & Will Be Withheld from Public Disclosure ML20128H5301996-10-0707 October 1996 Informs That Licensee 960314 Request to Withhold GE Girafee Helium Tests Apparent Test Results Repts & Data Transmittal for Giraffe Helium Tests H3 & H4 from Public Disclosure,Per 10CFR2.790,granted ML20128H5141996-10-0707 October 1996 Informs That Licensee 951212 Request That GE Panda steady- State Tests S1 Through S6 Pcc Performance Apparent Test Results,Rev 1 Be Withheld from Public Disclosure,Per 10CFR2.790,granted ML20128H4971996-10-0707 October 1996 Advises That GE Giraffe Sys Apparent Test Results Repts Will Be Withheld from Public Disclosure Ref 10CFR2.790,per 960321 Request ML20129F5061996-10-0303 October 1996 Advises That Info Submitted in 960109 Rept Entitled, Panther/Ic Apparent Test Results Phase 3, Will Be Withheld from Public Disclosure,Per 10CFR2.790(b)(5) & Section 103(b) of AEC of 1954 ML20129F5031996-10-0303 October 1996 Advises That Info Submitted in 960109 Rept Entitled, Post-Test Calculations of Panda Pcc Steady-State Test, Will Be Withheld from Public Disclosure,Per 10CFR2.790(b)(5) & Section 103(b) of AEC of 1954 ML20129E8831996-10-0202 October 1996 Informs That GE Panda Steady-State Tests Data Transmittal Rept Will Be Withheld from Public Disclosure,Per 10CFR2.790 (b)(5) & Section 103(b) of AEA of 1954,as Amended ML20129F6181996-10-0202 October 1996 Advises That Giraffe Sbwr Sys Interactions Test Rept Will Be Withheld from Public Disclosure Ref 10CFR2.790, Per 960617 Request ML20129F6341996-10-0202 October 1996 Advises That Panthers/Ic Atrs Will Be Withheld from Public Disclosure Ref 10CFR2.790,per 960222 Request ML20129G5841996-10-0202 October 1996 Advises That,Data Transmittal for Giraffe Helium Tests H1 & H2,as Requested by Will Be Withheld from Public Disclosure Per 10CFR2.790(b)(5) & Section 103(b) of 1954 AEA ML20129E8681996-10-0101 October 1996 Informs That Licensee 960222 Request to Withhold GE Panda Steady-State Tests S10-S13 Performance from Public Disclosure Per 10CFR2.790.Request Denied Because No Affidavit Was Submitted ML20129E6361996-10-0101 October 1996 Advises That GE Panda Transient Integral Test Data Transmittal Repts Will Be Withheld from Public Disclosure Ref 10CFR2.790,per 960816 Request ML20129G6311996-10-0101 October 1996 Advises That Giraffe Helium Series Test Rept,As Requested by Will Be Withheld from Public Disclosure Per 10CFR2.790(b)(5) & Section 103(b) of 1954 AEA ML20248F3891996-07-31031 July 1996 Forwards Rept on Staff Evaluation of GE Tracg Model Description,Rev 1,related to Containment Area,In Response to ML20059D2001993-11-29029 November 1993 Forwards Request for Addl Info Re Sbwr Design Certification & Requests That Written Response to Encl Questions Be Provided within 60 Days of Dtd Ltr ML20059D2211993-11-26026 November 1993 Forwards Request for Addl Info Re Sbwr Design Certification & Requests That Response to Encl Questions Be Provided within 30 Days of Dtd Ltr ML20058A8111993-11-18018 November 1993 Forwards Notice of Nonconformance & Insp Rept 52-004/93-01 on 930809-13 ML20058L2231993-11-0909 November 1993 Forwards Request for Addl Info on Simplified BWR Design Certification.Response Requested within 90 Days of Ltr Date ML20059K3151993-11-0909 November 1993 Discusses GE Relief from NRC Metrication Policy for Both ABWR & Sbwr Designs ML20062J4251993-09-28028 September 1993 Requests for Addl Info to Support Review Activities Re Sbwr Design Certification.Record Copy ML20059F8961993-09-28028 September 1993 Requests for Addl Info to Support Review Activities Re Sbwr Design Certification ML20057D2271993-09-27027 September 1993 Forwards for Review & Comment,Draft Rept Prepared by Llnl Entitled a Defense-in-Depth & Diversity Assessment of GE Sbwr Protection Sys,Task 12. Requests Comments Be Provided within 30 Days of Ltr Receipt ML20059F9031993-09-15015 September 1993 Requests Addl Info Needed to Support Review Re Sbwr Design Certification.Response Requested within 120 Days of Ltr Date ML20058N1501993-09-0101 September 1993 Forwards Request for Addl Info Re Simplified BWR Design Certification.Response Requested within 90 Days of Ltr Date ML20056G7531993-09-0101 September 1993 Provides Summary of Most Significant Insp Findings in Advance of Insp Rept So That Appropriate & Timely Corrective Action Can Be Taken,Per Insp Rept 99900403/93-01 on 930809- 13 ML20058N1531993-08-26026 August 1993 Forwards Request for Addl Info Re Simplified BWR Design, Specifically Neutronic Info (Q440.1-Q440.5).Response Requested within 60 Days of Ltr Date ML20056H1391993-08-23023 August 1993 Forwards K Jones Describing Quality Deficiencies Re GE Testing Activities at Inel Gist Facility ML20057E2051993-08-20020 August 1993 Forwards Request for Addl Info Re Simplified BWR Design, Specifically Giraffe Testing Program & Panthers Facility (Q950.1-Q950.26) ML20056D9571993-07-29029 July 1993 Informs That NRR Will Conduct Insp at GE Nuclear Energy Ofcs in San Jose,Ca on 930809-13.Insp Will Review QA Programs & Controls Implemented During Tests Conducted at gravity-driven Cooling Sys Integral Sys Test Facility ML20128G0181993-02-0909 February 1993 Forwards SECY-92-339, Evaluation of GE Test Program to Support Design Certification for Simplified Bwr ML20128B4281993-01-28028 January 1993 Forwards Requests for Info for Simplified BWR Design Application ML20126A4361992-12-15015 December 1992 Advises That NRC Must Review Modified Tracg Computer Code for thermal-hydraulic Analyses Prior to Acceptance of Design Certification for Simplified Bwr.Initial Survey of Tracg Must Be Arranged in Jan 1993 1998-05-28
[Table view] |
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NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001
%."/ .+ September 28, 1993 Docket No.52-004 Mr. Patrick W. Harriott, Manager Licensing & Consulting Services GE Nuclear Energy 175 Curtner Avenue San Jose, California 95125
Dear Mr. Marriott:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING THE SIMPLIFIED BOILING WATER REACTOR (SBWR) DESIGN The staff has determined that it needs additional information to support its independent assessment program activities related to the SBWR design certifi-cation review. Some additional information is needed-on the isolation condenser system performance (Q950.27-Q950.34).* Please respond to the enclosed questions within 60 days of the date of this letter.
You have previously requested that portions of the information submitted in the August 1992 application for design certification of the SBWR plant, as supplemented in February 1993, be exempt from mandatory public disclosure.
The staff has not completed its review of your request in accordance with the requirements of 10 CFR 2.790; therefore, that portion of the submitted information is being withheld from public' disclosure pending the staff's final' determination. The staff concludes that this RAI does not contain those portions of-the information for which you are seeking exemption. However, the staff will withhold this letter from public disclosure. for 30 ~ calendar days -
from the date of this letter to ' allow GE Nuclear Energy. the opportunity to verify the staff's conclusions. .If, after that time, you do not request that all or portions of the information in the enclosure be withheld .from public-disclosure in accordance with 10 CFR 2.790, this letter will be placed in the NRC's Public Document Room.
This request for additional information affects nine or . fewer respondents, land L therefore, is not subject to review by the Office of Management and Budget.
under P.L.96-511.
NBC RLE CENTER COPY
- The numbers in parentheses designate the tracking numbers. assigned to the
~
questions.010024
-p-~n l M % LosoMM/W _- ,
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. i Mr. Patrick W. Marriott September 28, 1993 If you have any questions regarding this matter, please contact me at (301) 504-1178 or Mr. Son Ninh at (301) 925-1125.
Sincerely, (Original signed by)
Melinda Malloy, Project Manager Standardization Project Directorate '
Associate Directorate for Advanced Reactors and License Renewal Office of Nuclear Reactor Regulation ,
Enclosure:
RAI on the SBWR Design cc w/ enclosure:
See next page Distribution (w/ enclosure):
- PDR MMalloy SNinh i DMcPherson, 8E2 RElliott, 8H2 Alevin, 8E21 Y-Schen, NLN344 TLee, NLN353 MFinkel stein,15B18 ATGody, Jr. ,17G21 JMonninger, 8H2 . MSnodderly, 8H2 MCaruso, 8El Shou, 7H15 SAli Syed, 7H15 Slee, 7H15 .
JHan, NLN353 CTinkler, NLN344 ANotafrancesco, NLN344 Distribution (w/o enclosure):
DCrutchfield/WTravers RBorchardt JNWil son PShea TMurley/FMiraglia,12G18 WRussell,12G18 AThadani/MVirgilio, 8E2 RJones, 8E21 RBarrett, 8H2
- BSheron/TKing, NLS007 FEltawila, NLN344 LShotkin, NLN353 JMoore, 15B18 ACRS (11) GSuh (2), 12E4 GBagchi, 7H15 ;
- To be held for'30 days I ., .
OFC LA)fDh PM:PDST _
PM:,PDSJ SRX,B,f SGS M ) YPDhT NAME PShek- 'MN1oktz SNriik R$ed Rk)t( JNWiYson DATE 09/b93 09/r)/93 09/.b/S3 09/O93 09/ky/93 09/ 28/93 DOCUMENT N : BWR9317.MM
}-i
d-Mr. Patrick W. Marriott Docket No.52-004 General Electric Company cc: Mr. Laurence S. Gifford GE Nuclear Energy 12300 Twinbrook Parkway Suite 315 Rockville, Maryland 20852 :
Director, Criteria & Standards Division Office of Radiation Programs U.S. Environmental Protection Agency 401 M Street, S.W.
Washington, D.C. 20460 Mr. Sterling Franks U.S. Department of Energy NE-42 Washington, D.C. 20585 Mr. John E. Leatherman SBWR Licensing Manager GE Nuclear Energy 175 Curtner Avenue, M/C 781 San Jose, California 95125 Mr. Frank A. Ross Program Manager, ALWR Office of LWR Safety & Technology U.S. Department of Energy NE-42 19901 Germantown Road Germantown, Maryland 20874 I
t 1
i
- i
REQUEST FOR ADDITIONAL INFORMATION (RAI) ON THE SIMPLIFIED BOILING WATER REACTOR (SBWR) DESIGN Isolation Condenser System Performance In the following questions, the term " capacity" is intended to denote either :
the heat removal rate (Watts) or the steam condensation rate (kg/s), as !
appropriate. The questions are structured to support a modeling approach by :
which a basic heat exchanger capacity is determined each calculational time step depending upon the current isolation condenser system (ICS) or passive containment cooling system (PCCS) pool temperature. Inis basic capacity would ,
then be operated upon by correction factors to reflect the effect of flow :
through the ICS vent line, the presence of noncondensable gas in the inlet stream, and the effect of varying pressure in the reactor vessel.
It is recognized that other approaches are feasible, and that the detailed information available at GE may be more appropriate to an alternate approach.
If this is the case, then the provision of the needed information in a different form, such as graphs or tables, would be acceptable.
950.27 From Sections 5.4.7 and 15.2** of the standard safety analysis -
report (SSAR), it is clear that no operator action is required to initiate ICS vent line operation when the reactor vessel is at pressure, cycling between 7.584 HPa [1100 psig (vent valve closure pressure)] and 8.618 HPa [1250 psig (set point for safety reli,ef i valve opening)] if significant noncondensable gas is present. '
However, after vessel depressurization, it is unclear to what extent the ICS condensers would effect the subsequent course of the accident. ,
It is recognized that an actuation signal for IC operation is Level 2 in the reactor pressure vessel (RPV). Automatic depressuri-zation system (ADS) operation begins on a Level I signal. Thus, the ICS should be in operation when the reactor coolant system !
(continued on next page)
- This is the effect of the flow upon the heat transfer coefficient. The model will determine whether or not the heat exchanger tubes have become bound by, noncondensable gases and will calculate the clearing of noncondensable gases from the tubes when the vent valves are opened. i j
- See items 15.2.3.2(5),15.2.4.2(2),15.2.5.2(4),15.2.6.2(4),and 15.2.7.2(3). ;
- It is recognized that the ICS vent valves open at 7.653 MPa (1100 psig) and ;
that at full capacity, ICS operation should prevent reactor vessel pretsure from reaching the safety relief valve set point. Furthermore, in the absence '
of noncondensable gases, ICS operation does not depend upon vent valve operation and the vessel should reach pressures well below 7.584 HPa. .
Enclosure ;
)
y RAI ON THE SBWR DESIGN depressurizes, should conditions proceed that far. Provide information is requested concerning the effectiveness of the ICS after ADS actuation (with depressuriration valve opening) and vessel depressurization.
950.28 Provide information concerning the effect of reactor vessel pressure on ICS performance over the entire pressure range that the ICS is expected to operate, including severe accident conditions. If the isolation condensers are assumed to remain functional after vessel depressurization (either because the vent line valves fail open or because of operator intervention to open the vents), significant degradation in ICS performance would be expected. Therefore, extend the range of the performance versus pressure curve to include anticipated drywell pressure under severe accident conditions.
950.29 How does the ICS heat exchanger innerus' rface heat transfer. coeffi-cient increase when (choked) vent line flow is initiated? If it is expected that the ICS would remain functional after DPV operation because of manual opening of the vent valves, then also provide information concerning the increase in ICS performance with increas-ing vent line flow. Alternatively, how does the ICS performance increase with the reactor vessel-to-pressure suppression pool pressure differential when the vent valves are open at low pressures?
950.30 The basic ICS capacity is assumed to be affected by noncondensable gases in the inlet stream and changes in the pool temperature in a manner similar to that-indicated by the corresponding information.
previously provided for the PCCS. If the performance __ degradation factors for changes in th + noncondensable gas mole fraction and in the IC/PCCS pool temperatures are not the same as for the PCCS, provide values appropriate to the ICS.
950.31 Provide information concerning any special sensitivities of the ICS performance to hydrogen. (The paper entitled " Local Heat Transfer Coefficients _ for Fo'rced-Convection Condensation of Steam-in a Vertical Tube in the Presence of a Noncondensable Gas" by Mansoor Siddique, Michael W. Golay, and Mujid S. Kazimi, Nuclear Technology, _
Volume 102, June 1993, has been reviewed.)
950.32 With respect to the ICS bottom vent valves, SSAR Section 5.4.6.2.3 states "...when the RPV gauge pressure decreases below 7.584 MPa (1100 psi) .(reset value) and after a time delay to avoid too many cycles,_ these valves close." What is the length of this time delay?
7
.i RAI ON THE SBWR DESIGN 950.33 SSAR Section 5.4.6.2.2 indicates "A catalytic converter is provided to recombine noncondensable gases (hydrogen and orf]en) under normal plant operation (ICS standby condition)....The catalytic converter' is located on the steam distributor cover at the top end of the steam supply line to the isolation condenser." What is the capacity of this converter and would it be expected to have any significant effect under severe accident conditions?
950.34 SSAR Section 5.4.6.2.2 states "...a vent [ purge line as described in SSAR Section 17.3.11] is provided that takes a.small stream of gas from the top of the isolation condenser and dumps it downstream of ,
the RPV on the main steamline upstream of the MSIVs (main steamline isolation valves)." Will the purge line be opened during operation' .
of the ICS? If so, could the purge line provide a mechanism for noncondensable gas removal or buildup during a severe accident sequence?
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