ML19343D197
| ML19343D197 | |
| Person / Time | |
|---|---|
| Issue date: | 02/02/1981 |
| From: | Wu T Advisory Committee on Reactor Safeguards |
| To: | Plesset M Advisory Committee on Reactor Safeguards |
| Shared Package | |
| ML19343D198 | List: |
| References | |
| ACRS-CT-1305, NUDOCS 8104090916 | |
| Download: ML19343D197 (1) | |
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From:
0 22-23, 198,
ACRS/ECCS Subcommittee hieeting October
Subject:
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The meeting was timely to review the recent results of the Sem sc ll break LOCAs. A and LOFT tests on transient system fesponses to smais the effect of main coolan topic that has emerged to attract more attentionpump SBLOCA and in this connection the desired criterion for mitigatingThese test progra d for data upon which to evaluate ECCS models.
safety.
i SBLOCA The pros and cons of pumps-on-or-pumps-off operations dur ngi were very excellently deliberated by Brian Sheron w The problem seems to be very complicated as ith reactor safety and recovery.
requires clarification of variou, physical effects sucf subcooling, degradation of orientation, local flow stratification and degree o and this may not have pumps in prolonged working with a two-phase flow, etc. ;
To this list marking a lack of our understandi exhausted the list.
local break flow in respect to Itke to add two more aspects.
the long-duration transient behavior of the ~Hd fraction, rarefaction changes in stratification, phase separation,' v s (local) depressurization.
i propagation and discharge rate while under a cont nuou nt.
The other Results from such a study are necessary for code improv f
ance in two-phase duration pump flow regimes, is to stress the need of conducting more long-
- point, h Semiscale pump tests performance tests with two-phase flows to supplement t eThe long-d end EPRI 1/3-scale pump test results.
dicting long-duration transients
- re necessary for code improvement in pre jd ment on pump trip (should the RCP's be allowed running) and for making u ge in order to insure restart of the RCP's.
that it is well i
hiy overall impression of the Semiscale test program s I am in favor of seeing the Semiscale facility used It would be a great success if the result of so planned and well conducted.
of a code pinpointed to primarily for code assessment.
~
t using Semiscale data can help ascertain the weak par s) so that they can be b
the relevant physical factors (mentioned a ove accurately modeled.
810 4090 f@
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