ML20198H315
| ML20198H315 | |
| Person / Time | |
|---|---|
| Site: | 05200002 |
| Issue date: | 12/14/1998 |
| From: | Wen P NRC (Affiliation Not Assigned) |
| To: | Essig T NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9812290310 | |
| Download: ML20198H315 (40) | |
Text
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p 2 UNITED STATES
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NUCLEAR REGULATORY COMMISSION
!- WASHINGTON, D.C. 20615 0001
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l ***** December 14, 1998 l
MEMORANDUM TO: Thomas H. Essig, Acting Chief Generic issues and Environmental Projects Branch Division of Reactor Program Management
, Office of Nuclear Reactor Regulation FROM: Peter C. Wen, Project Manager h-edy C. M Generic issues and Environmental Projects Branch Division of Reactor Program Management Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF NOVEMBER 17,1998, MEETING WITH ABB-COMBUSTION ENGINEERING REGARDING REVISION TO LARGE-BREAK LOCA EVALUATION MODEL On November 17,1998, a public meeting was held at the U.S. Nuclear Regulatory Commission's offices in Rockville, Maryland, between members of ABB-Combustion Enginc ring, Inc. (ABB-CE) and NRC staff. Attachment i lists attendees at the meeting. Most portions of the meeting involved discussion of proprietary information. Attachment 2 is a copy of the non-proprietary material handed out at the meeting.
The purpose of the meeting was to discuss the issues related to the revision of ABB-CE large-break LOCA evaluation models. ABB-CE feels that its current models are too l conservative compared to other vendor's models. In order to better serve its customers, ABB-CE plans to revise its current large-break LOCA evaluation models.
1 The meeting started with an ABB-CE representative presenting a meeting agenda and the overview of ABB-CE's licensing plans. At this meeting, ABB-CE presented the features of changes in conjunction with the planned revision. On November 18,1998, a conference call was held between NRC staff and ABB-CE representatives, to continue discussion on the same subject.
Major discussion points during the meeting and the follow-up telecon are as follows:
The staff informed ABB-CE that generally the staff prefers a lead plant application be submitted in support of the review and approval of a topical report. After receiving the topical report, the staff will perform an acceptance review. Submittals not meeting the acceptance requirements will be returned, identifying deficiencies, without further review. The staff also stated that an electronic version of the code should be included in
! the submittal package to allow the staff to perform an independent verification.
l ABB-CE identified certain process changes which were within the currently NRC-j approved models. It would notify the NRC when these changes were made, but did not intend to request NRC review. The staffindicated that this could be done, but that all such changes were subject to NRC audit and that information describing the changes i 9812290310 901214 6 05 i PDR ADOCK052Og3
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,. . T. Essig December 14, 1998 l must be retained. The staff also indicated that if changes involved plant parameter or )
l analysis inputs, the values of these inputs should reflect consideration of surveillance uncertainties either in the values used in the analyses or the values supplied by the utility. !
. ABB CE plans to remove some conservatism in its current LOCA model. The staff teplied that it is permitted to change the discretionary features of an Appendix K model as long as there are data to back up the change. However, any change to the Appendix K required features is not acceptable.
ABB-CE asked if retaining conservatism was a valid basis for staff acceptance of an ECCS model. The staff replied that the latest ABB-CE Appendix K small-break LOCA model was approved based on conservatism on a model-specific basis. However, since that review it has been identified that the conservatism in the model is not as large as it was perceived to be during the review.
. The staff identified a heat transfer graph that may be of concem in the ABB-CE handout l material. The staff clarified that non-physical and non-conservative models were not acceptable.
. ABB-CE requested the staff to complete the review within 6 months after its submitted the topical. The staff stated that there are currently no funds budgeted for contractor support; thus, the planned topical review would have to be performed in-house on a schedule consistent with the staff's workload. The requested time frame may be too tight l for the complex issues involved in the review, but asked that the staff be given an opportunity to reassess the priority of work once the topical report was submitted and the lead plant identified.
Attachments: As stated cc w/atts: See next page i
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T. Essig December 14, 1998 l
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l must be retained. The staff also indicated that if changes involved plant parameter or analysis inputs, the values of these inputs should reflect consideration of surveillance l
uncertainties either in the values used in the analyses or the values supplied by the utility.
{
. ABB-CE plans to remove some conservatism in its current LOCA model. The staff replied that it is permitted to change the discretionary features of an Appendix K model l as long as there are data to back up the change. However, any change to the Appendix i K required features is not acceptable.
ABB-CE asked if retaining conservatism was a valid basis for staff acceptance of an ECCS model. The staff replied that the latest ABB-CE Appendix K small-break LOCA model was approved based on conservatism on a model-specific bas:s. However, since that review it has been identified that the conservatism in the model is not as large as it was perceived to be during the review.
The staff identified a heat transfer graph that may be of concern in the ABB-CE handout material. The staff clarified that non-physical and non-conservative models were not acceptable.
. ABB-CE requested the staff to complete the review within 6 months after its submitted i the topical. The staff stated that there are currently no funds budgeted for contractor support; thus, the planned topical review would have to be performed in-house on a schedule consistent with the staff's workload. The requested time frame may be too tight for the complex issues involved in the review, but asked that the staff be given an opportunity to reassess the priority of work once the topical report was submitted and the lead plant identified.
Attachments: As stated cc w/atts: See next page DISTRIBUTION: See attached page f Document Name: g:\pxw\msum1117.abb //
OFFICE PM:PGEB:DRPM BC:hB SC:Ph NAME PWen:SW pcyf T, Col $ FAkhlhz DATE 11/3 o/98 / if/ 01 /98 pd Jh8 OFFICIAL OFFICE COPY l
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.d Distribution: Mtg. Summary w/ ABB-CE Re LBLOCA Evaluation Model Dated December 14. 1998 Hard Cooy Decket File PUBLIC PGEB R/F OGC ACRS-PWen EWeiss FOrr SMagruder EMail SCollins/FMiraglia BSheron RZimmerman
. BBoger JRoe DMatthews TEssig FAkstulewicz GHolahan SNewberry TColiins GTracey, EDO
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,, NRC/ABB-CE MEETING ON LARGE-BREAK LOCA EVALUATION MODEL REVISION LIST OF ATTENDEES November 17,1998 NAME ORGANIZATION Eric Weiss NRR/SRXB Frank Orr NRR/SRXB Peter Wen NRR/PGEB Ernie Jageler ABB-CE Joe Cieary ABB-CE lan Rickard ABB-CE Attachment 1 l-i
LBLOCA EM NRC/ABB Meeting 11/17/98 ,
NRC/ABB MEETING .
REGARDING LBLOCA EM REVISION PLANNING MEETING DATE: TUESDAY, NOVEMBER 17,1998 MEETING TIME: 1:00 P.M.
LOCATION: NRC OFFICES, WHITE FLINT, MD A EDED Pagei NON- PROPRIETARY VERSION 7%EEED Attachment 2
LBLOCA EM NRC/ABB Meeting 11/17/98 ,
AGENDA NRC/ABB LBLOCA EM REVISION PLANNING MEETING TUESDAY, NOVEMBER 17,1998 1:00 P.M. NRC OFFICES, WHITE FLINT, MD
- 1. INTRODUCTION & MEETING PURPOSE
- 2. ABB UTILITY CUSTOMER'S GOALS & PERSPECTIVE
- 3. REVIEW OF ANNUAL NRC PLANNING MEETING LOCA PRESENTATION IN MAY 1998
- 7. ACTION PLAN
- 9. MEETING
SUMMARY
Ak ER ED Page 2 N EEEE
LBLOCA EM NRC/ABB Meeting 11/17/98 .
INTRODUCTION MEETING PURPOSE
+ ESTABLISH A LICENSING PLAN FOR REVIEW AND APPROVAL OF LBLOCA EM REVISIONS Acceptable to NRC Optimizes the Use of NRC and ABB Resources Supports the Needs of Utilities Depending on ABB LBLOCA EM Revisions for Improved Operation
+ ESTABLISH A PLAN FOR TECHNICAL REVIEW AND APPROVAL OF THE FOLLOWING TYPES OF CHANGES .
LBLOCA EM NRC/ABB Meeting 11/17/98 ,
ABB/NRC Planning Meeting Focus
- Interpretation of regulations
- Technical feedback on licensing plans
- Need for licensing review kickoff meeting t
A BR ED Page 4 7%5559
LBLOCA EM NRC/ABB Meeting 11/17/98 ,l i
ABB Customer's Goals & Perspective
+ Avoid limiting facility operations by an overly conservative ECCS performance analysis
+ Evaluating 24 month cycle, power uprate, new fuel designs, and cost effective reload fuel management schemes *
+ ABB models too conservative compared to other vendors' models
+ Preparation for competition in deregulated environment
+ Utilities that may take advantage ofimproved model:
[ ]
A BR ED Page 5 N EEEE
LBLOCA EM NRC/ABB Meeting 11/17/98 .
What our Customers Tell Us PCT Margins Relative to 2200 F 1
ECurrent EM Margins l l 50 i ABB Vendor A Vendor B Vendor BREM Non-EM :
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- c. ABB PCTs Vendor A PCTs Vendor B PCTs l l Tn -400 Calvert Chffs 21807 PAlstone 2 21137 R. Catioun 20667 - ~
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4 E St. Lucie 2 21507 St. Lucie 1 20407 - .;
WSES-3 21707 Palisades 18697 i #1
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ANO-2 21587 ~ .. . i; SONGS 21607
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-550 Palo Verde 21887 -
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-600 i
-650
-700 l Changes te EM for Non-EM Case ,
10 ANS Decay Heat M ultipler FLECHT Cooled Hot Rod For AB Reflood Rates Reduced Steam Venting - RCP Not Locked Reptaced D-R with C-8 (V Fdm Bolhng Correlation l
A ED ED Page 6 MEDED
LBLOCA EM NRC/ABB Meeting 11/17/98 ,
What our GoalIs For EM Revision PCT Margins Relative to 2200 F ;
g3 Current EM Margins a ABB EM Redsion Margin Goal l l 50 ,
ABB Vendor A Vendor B Vendor B/REN
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$ -350 ABBPCTs c Vendor A PCTs Vendor B PCTs Tn -400 -
Calvert Chffs 21807 -
Mustone 2 21137 R. Calhoun 20667 E St. Lucie 2 21507 St. Lucie 1 20407 lE -450 WSES-3 21707 Palisades 18697
-500 -
ANO-2 21587 SONGS 2160"F
-550 PaloVerde 21887
-600
-650 l
-700 Changes to EM for Non-EM Case 10 ANS Decay Heat M uitpier FLECHT Cooled Hot Rod For All Reflood Rates Reduced Steam Venting - RCP Not Locked Replaced D-R wth C-B N Filtn Boiling Correlation A ED ED Page 7 N EEEE
LBLOCA EM NRC/ABB Meeting 11/17/98 .;
Review of the Annual NRC Planning Meeting in May 1998 j + Update Large Break LOCA Appendix K Evaluation Model i
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Jk ED ED i Page 8 ESEEEE j r
LBLOCA EM NRC/ABB Meeting 11/17/98 .
Licensing Background of the LBLOCA EM
+ June 1975 NRC acceptance of Appendix K ECCS Performance LBLOCA EM 21 SER Constraints / Limitations 3 Major codes,5 Topical Reports,4 Topical Report Supplements
+ December 1975 NRC denied applicability to 16x16 fuel designs 5 SER Constraints / Limitations,1 Topical Report Supplement
+ August 1976 t NRC acceptance for applicability to 16x16 fuel designs NRC denied use of THERM code 1 SER Constraint / Limitation,1 Topical Report
+ November 1976, April 1978, & September 1978 NRC acceptance of various model corrections & updates 4 SER Constraints / Limitations,3 Topical Report Supplements ,
+ July 1986 ,
NRC acceptance of 1985 EM, including PARCH /HCROSS and NUREG-0630 NRC denied applicability to Westinghouse designs 8 SER Constraints / Limitations,4 Topical Report Supplements n G RI Page 9 N EEEE
v LBLOCA EM NRC/ABB Meeting 11/17/98 ,
Current Licensing Issues - 1985 EM
- i A BR Et Page 10 8%EDES
. . 1 LBLOCA EM NRC/ABB Meeting 11/17/98 Technical Background of the LBLOCA EM
- CEFLASH-4A
- Blowdownthermal-hydraulics
- CO MPERC-II
- Refill /Reflood thermal-hydraulics
- Containmentresponse f
- Core reflood heat transfer methodology (MOD-1C & MOD-2C)
- Core-wide zircaloy oxidation calculation methodology i
- HCROSS & PARCH / REM
- Core blockage and steam cooling methodology
- STRIKIN-II
- Hot rod heatup analysis (PCT and PLO)
A Bt 59
. Page 11 E%EEEE ,
LBLOCA EM NRC/ABB Meeting 11/17/98 .
LBLOCA EM Computer Code Flow Chart FATES 3B CEFL SH-4A l
COMPERC-II '
- FRELAPC HTCOF HCROSS
- PARCH : STRIKIN-II Peak Cladding Temperature ,
Maximum Cladding Oxidation Jk ED ED Page 12 ESEEEE
LBLOCA EM NRC/ABB Meeting 11/17/98 .
Technical Background of the LBLOCA EM Major Sources of Conservatism JL ED ER Page 13 ESEEEE
LBLOCA EM NRC/ABB Meeting 11/17/98 PROPOSED ABB LBLOCA EVALUATION MODEL REVISION (1999) cri ion Features Summary A ED ED Page 14 ESEEEE
LBLOCA EM NRC/ABB Meeting 11/17/98 .
ABB LBLOCA EVALUATION MODEL REVISION OBJECTIVE OF CHANGES Support customers' goals to obtain ECCS performance analysis margin by reducing conservatism .
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- Facilitate the NRC review process through a mutually agreed approach to licensing and by the evolutionary improvement of ,
models having relatively minimal regulatory impact A BR Et Page 15 ESEEEE
LBLOCA EM NRC/ABB Meeting 11/17/98 ABB LBLOCA EVALUATION MODEL REVISION i
DESCRIPTION OF CHANGES Process Change Within the Currently NRC-Accepted EM .
. \
- Replacement of Dougall-Rohsenow Changes Requiring Licensing Review 1
Ah sa me i Page 16 7%E9E9
LBLOCA EM NRC/ABB Meeting 11/17/98 .
~ -. _-
ABB LBLOCA FVALUATION MODEL REVISION FEATURES OF PROCESS CHANGES 4
A ED ED Page 17 7%B559
LBLOCA EM NRC/ABB Meeting 11/17/98 .
ABB LBLOCA EVALUATION MODEL REVISION FEATURES OF PROCESS CHANGES i, ,
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Page 18 p% ESES
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LBLOCA EM NRC/ABB Meeting 11/17/98 .
ABB LBLOCA EVALUATION MODEL REVISION FEATURES OF PROCESS CHANGES
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Page 19 p%3533
LBLOCA EM NRC/ABB Meeting 11/17/98 .
ABB LBLOCA EVALUATION MODEL REVISION FEATURES OF CHANGES Removal of Dougall-Rohsenow - Required by 10CFR50, Appendix K
- Current Model CEFLASH-4A & STRIKIN-II use Dougall-Rohsenow Model Revision i
A ED ED Page 20 ESEEEE - ;
LBLOCA EM NRC/ABB Meeting 11/17/98 .
Film Boiling Correlations vs. THTF Data L
Dougall-Rohsenow Groeneveld 5.7 Condie-Bengston IV
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ADD Page 21 N EEEE
I t LBLOCA EM NRC/ABB Meeting 11/17/98 ABB LBLOCA EVALUATION MODEL REVISION .
FEATURES OF CHANGES W i i
LBLOCA EM NRC/ABB Meeting 11/17/98 .L ABB LBLOCA EVALUATION MODEL REVISION FEATURES OF CHANGES ;
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- Page 23 E%EEEE i
LBLOCA EM NRC/ABB Meeting 11/17/98 .
2D-3D Program Effect of Steam Binding on Peak Cladding Temperature 250 '
- 400 200
,300 150 -
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% - 200 y 100 50 -100 .
\ ange R of USsJ Cold Leg ,
injection PWRs 0 ! i o 0 20 40 60 80 100 !
Percent Carryover to Steam Generator U-Tubes
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Notes: 1. Defined as the increase in peak clad temperature (PCT) relative to the PCT for no water carryover to the steam generator U-tubes.
- 2. Defined as the percent of water carryover from the core which reaches the steam generator U-tubes.
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- 3. This figure shows the maximum effect of water carryover and steam binding on PCT.
- 4. Best-estimate behavior is based on the predicted water N lh lh Page 24 N'g7re4.s-s.
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N EEEE
LBLOCA EM NRC/ABB Meeting 11/17/98 .;
ABB LBLOCA EVALUATION MODEL REVISION .
FEATURES OF CHANGES AL ED ED Page 25 E%EEEE
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LBLOCA EM NRC/ABB Meeting 11/17/98 .
, COMPERC-II Steam / Water Interaction [ ]
Model Comparison 1
LBLOCA EM NRC/ABB Meeting 11/17/98 .i ABB LBLOCA EVALUATION MODEL REVISION FEATURES OF CHANGES t
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LBLOCA EM NRC/ABB Meeting 11/17/98 .
Comparison of Model Change l
1 A Et ED Page 28 P%ESEE
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LBLOCA EM NRC/ABB Meeting 11/17/98 .
Validation of [ ] Model Change Against
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LBLOCA EM NRC/ABB Meeting 11/17/98 .!
ABB LBLOCA EVALUATION MODEL REVISION FEATURES OF CHANGES .
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Page 30 E%EEEE i
LBLOCA EM NRC/ABB Meeting 11/17/98 .
ABB LBLOCA EVALUATION MODEL REVISION Summary The LBLOCA EM revision will support ABB customers' needs for
. ECCS Performance Analysis & Operating margins. .
A Et Et Page 31 ESEEEE
LBLOCA EM NRC/ABB Meeting 11/17/98 .
ACTION PLAN
- ABB & Utility Customers to present objectives and goals to NRC for E M revision at next meeting Appendix K EM revision will provide acceptable ECCS performance for ABB Utility Customers' analysis and operating margin needs
- LBLOCA EM revision licensing plan designed with NRC guidance to maximize review effectiveness thereby minimizing downstream problems l
A BB EB Page 32 E%EEEE
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LBLOCA EM NRC/ABB Meeting 11/17/98 ,
Review and Approval Schedule for 1999 LBLOCA EM TASK DATE i
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LBLOCA EM NRC/ABB Meeting 11/17/98 .:
Meeting Summary
- Firm schedule for NRC and ABB on LBLOCA EM review
- NRC concurrence with EM revision plan desired before further commitment of resources
- ABB action items A Rt Et
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, CC:
-h' ABB-Combustion Engineering, Inc.
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cc: Mr. Charles B. Brinkman, Director l Washington Operations l ABB-Combustion Engineering, Inc.
l 12300 Twinbrook Parkway, Suite 339 '
Rockville, Maryland 20852 Mr. Ian C. Rickard, Director Nuclear Licensing j ABB-Combustion Engineering, Inc. .
Post Office Box 500 '
2000 Day Hill Road Windsor, Connecticut 06095-0500 l
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