ML19322C491
| ML19322C491 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/04/1978 |
| From: | Simmons R BABCOCK & WILCOX CO. |
| To: | |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001170819 | |
| Download: ML19322C491 (4) | |
Text
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TELECON:
ECCS - SMALL BREAK LOCA ANALYSIS N4M-2-14 12-4-78 REF LTR K-5020 W10C144 C-K Requested by Carl Michelson 2:00 8-671-1060 x2707 LHC Carl Michelson Lee Haack B&W: Bob Lightle Bob Jones TVA:
RLS Stu Thickman Harry O'Brfen Jim McF<...)
Lou Cartin Dennis Renner Henry Daily Carl:
What comments does B&W have on K-5020 and where do we go from here.
Bob L: Very detailed study - hard to respond w/o equally detailed study -
are trying to get problem in perspective.
Carl:
Question of vapor formation - Temp at hies pt = temp at core exit (steam in U-bend)
Bob J: Steam bubble does form - natural circulation does cease Carl:
What is heat removal mechanism when natural circulation ceases.
Bob J: Pool boiling. When accident starts - lose offsite power - get natural cire mode thru system. At this time, bubbles form in core region and are carried throughout RCS. Steam pocket forms
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in upper portit a of RV.
Press of RV supports hydrostatic head in hot leg (?) - vent valves open - liquid depletes to cold leg elev and steam escapes thru the break.
Carl:
Break isn't big enuf to take all heat out.
Bob J: Removal of all heat is not controlling factor in small break analysis. Trying to remove certain volume of steam. Some steam quenched by HPI.
Carl:
We factored this into our analysis. Your predictions are based on larger breaks - small breaks don't behave the same way.
Bob J: You probably don't have any natural circulation for small break case.
Carl:
Do you keep the core covered - If so, how do you know.
Bob J: Because of vent valve, will deplete system inventory - level will drop below secondary side of SG.
At that time, will still have water in RV - if you have inventory in system, you have water in RV.
Carl:
Do you disagree with my Figures 2 and 37 Bob J: Haven't checked your numbers.
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Carl:
Have to calculate to determine if core stays covered for breaks under
.05 ft - This is really all we're asking.
Bob J: We've looked at.05 break, in extrapolated to smaller breaks and concluded that covering the core is not a problem. NRC has accepted this, verbally, that smaller breaks are not a problem.
Carl:
Need B&W to point out where your results differ from ours - your calculations are more sophisticated than ours so we want B&W to tell us where we're wrong.
Bob L: To give the answers you want will require a detailed calculation from B&W.
Bob J: We don't feel this effort is warranted.
Carl:
Just reply to our K-5020 describing how you replied to NRC for breaks
<(.05Ft.2 Not asking B&W to do a new analysis.
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