ML20235N099
| ML20235N099 | |
| Person / Time | |
|---|---|
| Issue date: | 07/17/1987 |
| From: | Catton I NRC |
| To: | Boehnert P NRC |
| References | |
| ACRS-CT-1890, NUDOCS 8707170434 | |
| Download: ML20235N099 (2) | |
Text
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6T-/190
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TO:
Paul Boehnert FROM:
Ivan Catton
SUBJECT:
Thermal Hydraulic Phenomena Subcommittee Meeting April 28-29, 1987 Idaho Falls, Idaho The following paragraphs address briefly the items you delineated for comment at the close of the meeting. I will comment further following my return from Yugoslavia. If there are any specific items from the meeting you would like se to give special attention, let me know.
The Technical Integration Center The Executive Director for Operations directed the NRC staff to prepare a coordinated plan for integration of technical activities
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within the agency. When the Buff Book was done away with,as such pain as it caused, no accountable means of insuring that a plan was being followed remained. The EDO request is long overdue. To accomplish the stated goal, the Thermal-Hydraulic Technical Integration Center (TIC) was established, see appendix B of I
NUREG-1244 1ssued March 1987. One of the stated objectives of the TIC is to maintain technical cognizance of all thermal-hydraulic a
and related safety issues". The Principal Investigator for the TIC is Paul North. In my opinion, what was described at the subcommittee meeting does not meet the stated objective. Further the TIC PI did not speak at the meeting nor was he in attendence.
The TIC as described is not an integration center. It only looks at what it is told to look at. Unless entire areas are put under i
its purview, it will not meet the objectives stated in the above referenced NUREG. In essence, the TIC is the same people doing the same t h ir.g s as before. There are a number of areas where integration is needed. Several such areas were discussed at the meeting. It seems to me that the EDO should be told that the TIC as described will not meet the integration objective and that some serious thought is needed.
CEC Inteoral Escality The CEC Integral Facility will be one of the biggest items in the future budgets. It is not clear to se that we need such a facility g nor is it clear that if we do, that the facility described is the J one we ought to have. There were too many loose ends in the scaling arguments given by Jim Wolf. He was inconsitant. He was willing to-give up scaling the core properly yet would not relax the pressure requirements. Skewed scaling of the core is argued to be okay by saying 'it is the hydrodynamics that are important*. If this is the case, and I beliee it to be so, then a low pressure system is what i
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o is needed. Further there do not seem to be any scaling para that give a measure of the hydrodynamic scaling in the analys presented. A serious attempt to decide what impact one could e I
on multi-dimensional behavior was not made. Somebody just says.
think that-- ". Dave Ward's comment deserves repeatin), 'Uning~
local phenomena to rank the facility may not be proper. One show a
look to integral effects and reasonableness in local phenomena.'
Considering the magnitude of the project, a more complete analysis is needed.
An analysis of the trade offs between bigger, pressure and power is needed. Full consideration needs to be given to flexibility, and the ease with which measurements can be made. In my view, one needs to anticipate future needs. Todays test facility may not be i
what is needed tomorrow. The costs of future needs and flexibility f
need proper consideration. At present such thinking has not been m
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part of the process. The arguments given for choosing to emulate a B&W reactor are weak. It is not clear that the elements of a B&W plant being simulated are simulated well enough to be worthwhile.
I believe the staff should be told to do the study again with
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better balance.
Research Compendium The Rule refers to the Reg Guide for guidance. The guidance should be substantive and be based on past experience which in my view should be in the compendium. Being told that this is not done because the lawyers won't allow it means you get new lawyers. The Compendium is the document that will contain the essence of the last 15 years thermal hydraulics reserach which cost nearly $1B.
The tax payers deserve to have the results preserved in a meaningful and complete way. The comments made by Harold Sullivan should be taken to heart by RES. The reflood section has no comparisons of code calculations with data, discussion of weaknesses in our ability to handle condensation is missing, flow regime map j
considerations among other things are not to be found in the document. Chapter 6 sections do not conclude with statements about our ability to deal with the phenomena.
If the compendium is important it should be completed in a professional way. If not, then delay its issuance.
Expert's Group On Uncertainty I have written several memos on this subject. They contain in detail my views on th approach being taken. The approach suggested by Zuber is sensible as well as being scrutable.
Approaches such as is now being suggested by LANL based on the Latin Hypercube have proven time and again to be worthless and not be considered. I think the committee should, after review, encourage Zuber to continue his eforts.
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