ML20216J541
| ML20216J541 | |
| Person / Time | |
|---|---|
| Issue date: | 03/18/1998 |
| From: | Wang E NRC (Affiliation Not Assigned) |
| To: | Essig T NRC (Affiliation Not Assigned) |
| References | |
| PROJECT-702 NUDOCS 9803230482 | |
| Download: ML20216J541 (25) | |
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- i UNITED STATES Q-j NUCLEAR REGULATORY COMMISSION y
' WASHINGTON, D.C. enmaa annt e
March 18, 1998 MEMORANDUM TO:
Thomas H. Essig, Acting Chief Generic issues and Environmental Projects Branch Division of Reactor Program Management Office of Nuclear Reactor Regulation :
b FROM:
Egan Wang,' Reactor Engineer Generic issues and Regulatory improvements Section Generic issues and Environmental Projects Branch Division of Reactor Program Management Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF MEETING HELD ON MARCH 10,1998 WITH SIEMENS TO DISCUSS ISSUES RELATED TO RELAP4 COMPUTER CODE EXCESSIVE VARIABILITY ISSUES
{
' On March 10,~1998, the staff held a public meeting with Siemens Power Corporation ~(SPC) at NRC headquarters in Rockville, Maryland. The purpose of this meeting was to inform the staff of the current status of the 10 CFR Part 21 evaluation SPC had filed and SPC's proposed J
future actions. Attachment 1 lists meeting participants. Attachment 2 provides a set of slides
. presented by SPC during the meeting.
On December 2,1997, it was discovered that discontinuities in the modeling approximations used in the RELAP4 portion of the pressurized water reactor (PWR)large break loss of coolant ~
accident (LBLOCA) analysis may result in excessive variability in peak cladding temperature (PCT). SPC submitted an interim report in accordance with 10 CFR Part 21 on January 15,
~
1998, and planned to complete a safety evaluation and submit the findings on April 3,1998.
The SPC representatives stated that the problem was that a small variation in input or calculated conditions causes significant change in PCT. The SPC representatives also i
indicated that the small variations can be cause by time step variation, calculation of critical heat flux (CHF), minor differences due to compiler error, or trivial differences in rounding off input values. Some otner problems included: volume flow calculation, enthalpy transport, and effects of variability. However, the SPC representatives indicated that there was no indications i
that the current model is non-conservative.
]
The SPC representatives discussed their proposed model changes to 'reduceyariability by: 1) removing unrealistic models, removing discontinuities and improving consistency'of RELAP4
. calculations; 2) revising the numerical solution scheme; 3) revising definition of volume' average flow; 4) combining system and hot channel blowdown' calculations; 5) increasing nodalization and eliminating enthalpy transport model; and 6) improving consistency between RODEX2 and RELAP4 fuel rod models. Additional code changes include: minor code improvements, s
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j' T. Essig March 18, 1998 increasing dimensions to handle increased nodalization and larger arrays, automating l
calculation stream and data transfer, and increasing output detail and variables. SPC expected little or no change in results from these code changes.
l The SPC representatives stated that preliminary assessment of impact of variability changes l
has been performed for four PWR plants including limit case, break spectrum, and bumup.
effect. Based on the preliminary assessment, SPC has concluded 1) for all PWRs the current
)
limiting analysis of record was shown to be conservative; 2) for non-limiting cases, PCT varies about the approved model results; 3) limiting break size and burnup may change due to variability changes; and 4) preliminary results indicated analysis of record PCTs may decrease j
on the order of 100*F for some plants; thus requiring that the Dougall-Rohsenow issue be l
addressed.
SPC was planning to submit a topical report by August 31,1998. This topical report would include the above discussed model changes. In addition, it would include measures to reduce l
RELAP4 variability, revise film boiling correlation, and revise end of bypass model.
For the near term, the SPC representatives. stated that SPC planned to use current LBLOCA l
model, use the corrected model to demonstrate conservatism of the current model for each application of current model, and evaluate deviations discovered in the future with only the corrected model For the intermediate term, after topical report submittal, SPC planned to reanalyze each plant according to schedules established by licensees, using the topical report model For the long term, a realistic LBLOCA methodology would be submitted to NRC for.
approval. If the realistic LBLOCA methodology was approved, it would replace RELAP4 and other old computer codes and eliminate the type of problems discussed in this meeting.
The NRC stafirequested a letter from SPC that documented SPC's proposed changes, methodology, philosophy, and the plans for the future actions. The NRC staff also commented that staff resources are very limited. Due to its complexity, it is very difficult to determine the staff resources that would be available to review SPC's topical report on LBLOCA methodology, l
Both the NRC staff and the SPC representatives agreed that a meeting in mid-April should be
[
held after SPC completes its evaluation on the Part 21 interim report.
i Attachments: As stated I
I Project No. 702 cc:
Mr. Jerry Holm l
Product Licensing Siemens Power Corporation l
2101 Horn Rapid Road L
P.O. Box 130 L
Richland, Washington 99352-0130 i
T. Essig
-2 March 18, 1998 L
increasing dimensions to handle increased nodalization and larger arrays, automating calculation stream and data transfer, and increasing output detail and variables. SPC expected i
l little or no change in results from these code changes.
l The SPC representatives stated that preliminary assessment of impact of variability changes has been performed for four PWR plants including limit case, break spectrum, and bumup eMect. Based on the preliminary assessment, SPC has concluded 1) for all PWRs the current limiting analysis of record was shown to be conservative; 2) for non-limiting cases, PCT varies about the approved model results; 3) limiting break size and bumup may change due to variability changes; and 4) preliminary results indicated analysis of record PCTs may decrease on the order of 100*F for some plants; thus requiring that the Dougall-Rohsenow issue be i
addressed.
SPC was planning to submit a topical report by August 31,1998. This topical report would include the above discussed model changes. In addition,' it would include measures to reduce i
RELAP4 variability, revise film boiling correlation, and revise end of bypass model.
)
For the near term, the SPC representatives stated that SPC planned to use current LBLOCA model, use the corrected model to demonstrate conservatism of the current model for each application of current model, and evaluate deviations discovered in the future with only the corrected model. For the intermediate term, after topical report submittal, SPC planned to reanalyze each plant according to schedules established by licensees, using the topical report model. For the long term, a realistic LBLOCA methodology would be submitted to NRC for approval. If the realistic LBLOCA methodology was approved, it would replace RELAP4 and other old computer codes and eliminate the type of problems discussed in this meeting.
l The NRC staff requested a letter from SPC that documented SPC's proposed changes, methodology, philosophy, and the plans for the future actions. The NRC staff also commented that staff resources are very limited. Due to its complexity, it is very difficult to determine the staff resources that would be available to review SPC's topical report on LBLOCA methodology.
Both the NRC staff and the SPC representatives agreed that a' meeting in mid-April should be held after SPC c?mpletes its evaluation on the Part 21 interim report.
Attachments: As stated a
Project No. 702 i
cc:
Mr. Jerry Holm Product Licensing Siemens Power Corporation 2101 Hom Rapid Road P.O. Box 130 Richland, Washington 99352-0130 DISTRIBUIlON: See attach page Document name: G:\\980310MT. SUM
- See previous concurrences OFC PGEB SRXB SC:PGEB AC:PGEB NAME EWang:sw RCaruso*
FAkstulewicz*
TEssig 03/lf /h8 DATE 03/18/98 03/16/98 03/17/98 OFFICIAL RECORD COPY
4 List of Attendees Name Organization Phone Number Egan Wang USNRC 301-415-1076 J;rry Holm SPC 509-375-8142 Gregory Baustian Consumer Energy 616-764-2533 Edward Kendrick USNRC 301-415-2891 Robert Pettis, Jr.
USNRC 301-415-3214 Greg Cwalina USNRC 301-415-2983 R lph Caruso USNRC 301-415-1813 R bin Feuerbacher SPC 509-375-8267 J:mes Mallay SPC 509-375-8757 John Caves CP&L 919-546-4579 V:rn Hodge USNRC 301-415-1861 Joseph Staudenmeier USNRC 301-415-2869 Rriph Landry USNRC 301-415-1140 M:rtin VanHaltern Northeast Utilities 860-832-4776 D:niel Denver SPC 509-375-8395 Richard Collingham SPC 509-375-8392 S. E. Jensen SPC 509-375-8477 l
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