ML19221A479
| ML19221A479 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/09/1979 |
| From: | Thiesing J INDUSTRY ADVISORY GROUP |
| To: | Levenson M ELECTRIC POWER RESEARCH INSTITUTE |
| Shared Package | |
| ML19221A475 | List: |
| References | |
| NUDOCS 7905230065 | |
| Download: ML19221A479 (1) | |
Text
} M~ f( W V To:
Milt Levenson Date:
April 9, 1979
Subject:
RCS Behavior From:
J.
W. Thiesing Copies:
J. C. Judd Of:
TMI - IAG The following is an assessment of RCS behavior in the "perculating" code before large amounts of nonct.adensibles build up.
Initial Conditions 1.
Secondary side solid -- cold water 2.
Pressuri:er vented to containment at csphere, either by relief valve open or through 3/8" sa:ple line re-plumbed to containment.
3.
Pri=ary system solid 4.
Core flood tanks floating -- either under N., head or on head. tank 5.
Little or no non-condensibles 6.
RC punps off 7.
Assume little or no natural circulation Behavior 1.
Heat generation in core will fom steam 2.
Steam will fom bubble in top of vessel 3.
Steam bubble will displace water and raise pressurizer level (n' bd wy,,
7,9
- c 4.
h' hen bubble uncovers top of hot legs, steam will (eventually) slide out hot leg, for=ing bubble at top of candy cane quite rapidly (roughly 5000 - 10000'cf=).
5.
The increasing bubble volume continues to ocive water into pressurizer.4+=rd-
-- ~
c'--t
- c
- _s m,
6.
The increasing bubble volume in candy cane uncovers cold tubes in steam generator until such time as the condensing rate in steam generator equals or exceeds the steaming rate in the core.
7.
- Then, a.
If the system is heavily damped, a steady state steaming in core / condensing in steam generator condition will result.
ST_
b.
If the syste= is undamped which is more likely the bubble in the~ steam generator and candy cane will collapse rapidly, and the process will begin at Step 3 above again and repeat itscif, ad infinitum.
In this mode before significant non $onden:ibles build up, I do not believe there will be any perculating through the pressurizer, only a rising and falling of water level in the pressuri:er.
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