ML20246G080
| ML20246G080 | |
| Person / Time | |
|---|---|
| Issue date: | 03/16/1989 |
| From: | Advisory Committee on Reactor Safeguards |
| To: | Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-2626, NUDOCS 8905150182 | |
| Download: ML20246G080 (25) | |
Text
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fx s/p/n y-Lg UAIE ISSUED: 3/16/89 343kt ACRS Subcommittee Meeting Summary / Minutes l
For Severe Accidents March 7, 1989 Bethesda, Maryland Purpose The ACRS Subcommittee on Severe Accidents met on March 7, 1989 in Bethesda, Maryland. The purpose of this meeting was to discuss the NRC Staff's proposed Severe Accident Research Program (SARP) Plan.
Copies of the agenda and selected slides from the presentation are attached.
The meeting began at 8:30 a.m. and adjourned at 11:58 a.m. and was held entirely in open session. The principal attendees were as follows:
Attendees ACRS NRC/RES W. Kerr, Member B. Sheron I. Catton, Member F. Costanzi C. Siess, Member N. Zuber D.' Ward, Member R. Meyer P. Davis, Consultant D. Houston, Staff Review Document The principal document for discussion at this meeting was:
Memorandum dated February 10, 1989, from Brian W. Sheron, Division Director, Office of Nuclear Regulatory Research, to Forrest J.
Remick, Chairman, ACRS, " Revised Severe Accident Research Program Plan (Attached draft SARP plan predecisional).
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_ [gg 8905150182 890316 Certified By 2626 PDC L
.o Severe Accidents Meeting Minutes March 7, 1989 Actions, Agreements, and Commitments (1) On the basis of the preliminary review, the Subcommittee agreed that the program plan was a positive step and that a Comittee letter could be drafted for consideration at the March 9-11, 1989 meeting.
(2)
In response to I. Catton's remarks, the Staff agreed to look at Meiner's work of 15 years ago on the convection process inside a heated crucible.
Discussion In his opening remarks, W. Kerr indicated that the Subcommittee had not had sufficient time for a thorough review of the draft. Severe Accident Research Program (SARP) Plan, but that on the basis of his preliminary review, he believed that the plan had a number of positive aspects. He expressed a view that there was an undesirable emphasis on direct containment heating (DCH) and that the schedule and resource allotment were overly optimistic. He cautioned the Staff not to refer to SECY-88-147 as an integration plan since previous reviews and a Comittee letter had found or stated that there was little integration displayed in that plan.
C. Siess asked the Staff to clarify the various parts of the SARP plan, i.e., short-term, long-term, new vs. original. The short-tenn part appeared to be those items of importance while the long-term closely resembled the original plan to find out everything about everything.
B. Sheron (RES) discussed the historical background of the Severe Accident Research Program (SARP) Plan and how it had been recently redirected. The redirection was mainly to reduce the number of indepen-dent programs in the field of study and to attempt to integrate the on-going programs. The near-term SARP activities are concerned with
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Severe Accidents Meeting Minutes March 7, 1989 L
~ scenarios ar.d phenomena that can lead to early containment failure. The longer-term SARP cctivities will address other phenomena important to severe accidents. He discussed the overall objectives of the program and indicated what areas of study would be emphasized.
F. Costanzi (RES) discussed the details of the near-term program in-dicating (for each issue) the specific questions to be addressed, the task breakdown for each question and some comments' received on the draft SARP plan in each area. The five issues for the near-term program were given as:
(1)ScalingAnalyses,(2)DepressurizationandDCH,(3)BWR Mark I Containment Shell Melt-Through, (4) Adding Water to Degraded Core,-and (5) The Use and Status of Severe Accident Codes. He briefly discussed'th'e long-term program which included:
(1) Modeling of Severe Accident Phenomena, (2) Core Melt Progression and Hydrogen Generation, (3) Fuel-Coolant Interaction, (4) Core-Concrete Interaction, (5) Fission Product Behavior, and (6) Fundamental-Data Needs.
N. Zuber (RES) briefly discussed the increased emphasis on scaling rationale for experiments. He indicated that this effort would be similar to the Code Scaling, Applicability, and Uncertainty (CSAU) methodology which was recently developed for the evaluation of thermal-hydraulic codes.
During the presentation, various aspects of the draft SARP plan were discussed and the following comments and concerns were expressed (random order):
(1) The priority and designation of the near-term and long-tenn issues was questioned. The modeling of severe accident phenomena seemed to be of immediate interest rather than for sometime in the future.
(2) The effort and funding (70% of total funds) devoted toward the phenomena of DCH appeared to be excessive. The Subcommittee
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Severe Accidents Meeting Fiinutes March 7, 1989 L
L 1-
' believed that more effort should be devoted toward making this l'
problem go away by studying modifications to plant equipment or revisions of operating procedures, (3) The Subcommittee agreed with the effcrts to redirect the program and expressed a concern that the Staff not bow to any. opposition that they are likely to encounter.
(4) The integration of this program into other RES activities was discussed and a question of who was responsible for this aspect was a,ked.-
It appears that this is still a weak area, integration being performed on an ad hoc basis.
(5) The Staff was asked why they have not applied the results for i
natural circulation (in-vessel) as presented by EPRI and INEL, The Staff indicated they would take another look at it.
(6) A concern was expressed that there is a lack of coupling between the front-end and back-end and between. accident sequences and uncertainties in the consequence assessment.
Future Subcommittee Action W. Kerr indicated a further detailed review of the final SARP plan would
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be appropriate, as well as, a continuing review of the program as it H
1 progresses.
NOTE:
Additional meeting details can be obtained from a transcript of this meeting available in the NRC Public Document Room, 2120 L Street, N.W., Washington, D.C. 20006, (202) 634-3273, or can be purchased from Heritage Reporting Corporation,1220 L Street, N.W., Suite 600, Washington, D.C. 20005,(202) 628-4888.
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3:
c ACRS Subcommittee Meeting on Severe Accidents March 7, 1989 Bethesda, Maryland l
Proposed Agenda -
A.
Subcommittee Cha van Remarks W. Kerr 8:30 am B.
Introduction and Goals of Severe B. Sheron 8:45 am Accident Research Plan C.
Meeting Near-Term Goals F. Costanzi 9:15 am Iss'ue.1:
Scaling Analyses Issue 2: Depressurization and DCH Issue 3: BWR Mark I Containment Shell Meltthrough Issue 4: Adding Water to a Degraded Core Issue 5:
The Use and Status of i
Severe Accident Models (Codes)
- Break ***
10:00-:0:15 am D.
Meeting Long Term Goals F. Costanzi 10:15 am 1.
Severe Accident Phenomena Issue Lli Modeling Severe Accidents Issue L2: In-Vessel Core Melt Progression and Hydrogen Generation Issue L3: Fuel-Coolant Interactions (In-Vessel)
Issue L4: Molten Core-Concrete Interaction (MCCI)
Issue L5: Fission Product Behavior and Transport 2.
Funcanental Data Needs E.
Severe Accident Scaling F. Costanzi 11:15 am Methodology (SASM)
F.
Subcommittee Discussion and W. Kerr 11:45 am Concluding Remarks
- Adjourn ***
12:00 pm (noon)
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