ML20024B448
| ML20024B448 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 11/30/1980 |
| From: | Rosalyn Jones GENERAL PUBLIC UTILITIES CORP. |
| To: | |
| References | |
| TASK-*, TASK-GB GPU-2520, NUDOCS 8307080755 | |
| Download: ML20024B448 (2) | |
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DK. JORDAN:
Well, I did have a question and I
^l 2 think it is much the same place, and I night as well ask it 3 now, and that is what fraction of full power heat can be 4 handled by condenser cooling or the natural circulation?
5 Can they handle a full 7 percent, or is it only a percent or i
6 some thing th a t you would have af ter an hour of shutdown?
7 WITNESS. JONES:
Well, the liquid-solid natural-a cir=ulation = ode is capable of removing the core energy 9 af ter reactor trip, and has been proven by various tests and 10 unplanned o:currences.
The boiler condenser mode is also 11 capable of doing the same scrt of thing.
It,vould choose 12 the system pressure where an adequate delta T would be 13 established between the primary system and the secondary 14 side liquid such that the heat could be transferred and that 15 pressure voud be dependent upon hov large a condensing 16 surf ace you had, and the type of energy you had to remove.
17 DR. JCEDAN:
I see.
And that is the reason you 18 vant 95 percent. full.
WITNESSJCNS:
The 95 percent full guarantees 19 20 th at you would have the capability for an exposed surface 21 area above the bottom of th e reactor coolant pumps such that 22 if you condensed steam in the primary tubes, the drop of 23 vater that vould then be added would push another drop of 24 vater back over the pump and cause the circulation to 25 continue, because of the loop seal arrangement that exists 8307080755 801130 PDR ADOCK 05000289 T
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4698 1belov the pump.
And you know, that is shown on that Figuro 4
21 following page 14, the loop seal concept that exists belov 3 th e pump.
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DR. JORDAN:
I guess -- show me again on the 5diagran.
6 WITNESS JO ES:
'Je ll, what I a= saying, the 95 7 percent level vould put you approximately at the top of the B little sguare indicating the raactor coolant pump.
!9 DR. JORDAN:
That is 95 percent on the secondary 10 si d e.
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El 3ES'S J0KIS:
That is 95 percent on the
't2 second ary side, and what that allows is rough *1y a 5 foot 13 cond ensin g surface above the inlet to the reactor coolant 14 pumps fron the pump section piping.
So you vould have the 15 capability f or a 5 ' foot. exposed surface area and then any 16 steam condensed in that region, provided that you maintained 17 th e reactor coolant system inventory sufficiently such that-
,18 th e loop real was full, any steam condensed in th e region 19vould fall'into that water which, by the hydrostatic head, 20 would push a little water over the pump and keep a
{21 cirrulation pa ttarn established.
22 DR. JCED A N:
Yes, I see what you are saying, but 23 no v isn't -- was I wrong then in assuning that the 95 i
24 percent level on the seconda y d Ae was
- o assure that there i
25 was an adeguate surf ace on the primary side for the l
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