ML20154H261
| ML20154H261 | |
| Person / Time | |
|---|---|
| Issue date: | 01/02/1986 |
| From: | Theofanous T Advisory Committee on Reactor Safeguards |
| To: | Boehnert P AFFILIATION NOT ASSIGNED, Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-CT-1828, NUDOCS 8603100233 | |
| Download: ML20154H261 (2) | |
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UNITED $TATES NUCLEAR REGULATORY COMMISSION 9DR 63b3E b g
5 a ADVISORY COMMITTEE ON REACTOR SAFEGUARDS WASHINGTON, D. C. 20556
...../ January 2, 1986 s
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Mr. Paul Boehnert 1717 H Street, NW, 10th Floor Washington, DC 20006
Dear Paul:
Re: 1. T. K. Larson, " Integral Systems Test (1st) Program Facility Scaling and Integrations," Draft EG&G Report.
- 2. J. Sursode and M. Young, " Coordination of Support Projects for the B&W Integral System Test Program," Draft.
- 3. A. Hashemi, et. al., "Two-Phase Flow Regimes and Carryover in a large Diameter of a PWR Hot Leg," Draf t SAIL Report.
At your request, I reviewed the above-referenced documents serving as background information for the next ECCS Subcommittee meeting at Palo Alto. My coments are as follows:
- 1. Larson's report makes a nice and much needed contribution. I like it because it provides a down-to-earth assessment with adequate qualifications in areas that are not fully known. I think he has the correct approach, using the equilibrium plot, in addressing some of the key aspects of the simulation of small breaks. I find his suggestion to heat the HPI interesting, and I feel the sugges-tion has merit. Clearly, we also need experiments with cold HPI.
The detailed results or HPI stratification and on equilibrium plots were not legible due to poor reproduction of Figure legends. Also, I agree with his conclusion that the scaling of all three facil-ities cover the domain of choice in a reasonable fashion, but that code analyses will be instrumental in putting the experimental results in a common basis.
- 2. Reference 2 is also a very nice sumary of a much needed coordination effort. I like it because it is rather specific on objectives and how the work intends to meet them. It also shows clearly how the various components of the program are intended to be meshed. I think they have done as well as may be expected at this time. The test, of course, will be on how well the follow-up will proceed.
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- Mr. Paul Boehnert January 2, 1986
- 3. Ref'erence 3 shows that for typical SBLOCA conditions pipe diameter and associated flow regime variations do not influence the thresh-old for liquid carryover (interruption of natural circulation).
Unfortunately, it does not bother to reference Ishii, who first established the proper way to look into the problem of interruption of natural circulation some time ago.
Sincerely, T. G. Theofanous Professor of Chemical and Nuclear Engineering Director, Center for Advanced Multiphase Processes & Safety Retype: da 1/10/86 l
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