ML19207B144
| ML19207B144 | |
| Person / Time | |
|---|---|
| Site: | Crane, Davis Besse  |
| Issue date: | 12/23/1978 |
| From: | TOLEDO EDISON CO. |
| To: | |
| References | |
| TASK-TF, TASK-TMR NUDOCS 7908230444 | |
| Download: ML19207B144 (6) | |
Text
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Transcript Notes from the Davis Besse-1 Project Manager 's Daily Telephone Log (December 23,1978) Concerning the Steam Generator Dual Level Set Point Modifications 12/23/78 Conference consisting of Brian Grimes, Ed Jordan, Don Kirkpatrick, Symore Weiss, Mort Fairtile, G. S. Vissing concerning TECo letter dated December 22, 1978 - Steam Generator Level Set Points Questions which were developed:
1.
What happens when operator fills SG and pressurizer goes solid?
2.
What is the effect of over cooling transient - when SG becomes filled with cold HPI? Do we exceed TS limits on cooling?
3.
What is the basic reason for the 35" level setpoint?
Is it for loss of offsite power or for loss of feedwater?
4.
Concern for operator going to 35" during a LOCA.
5.
Concern for loss of offsite power in which operator goes to 35" set point and then we have a small break.
Does 10 min. operator action effect ECCS analysis?
12/23/78 Call to Region III, Tom Tambling, John Streeter, Richard Knop with the people previously mentioned.
Discussed above.
12/23/78 Conference call to TECo, IE & 00R IE III - Tambling, Streeter, Knop IE Hdqr. - Ed Jordan, Don Kirkpatrick TECo - C. Domeck, E. Novak, Plant Rep.
00R - Grimes, Weiss, Fairtile, Vissing 1.
Would system go solid on HPI? Answer HPI pump shut off head is 16004/a" Would not go solid.
2.
Consequences of overcooling transient.
Answer - Plant is designed to sustain 40 loss of power to coolant pumps. This is similar to overccoling transient.
3.
What is reason for controlling SG at 35"? Operation is at 40".
Have had loss of feedwater @ 40% power and controlled at 35" by operator action.
Operator can quickly take this kind of action.
4.
Concerning implications on small break LOCA. Does natural circulation test show better heat transfer capability? Are they still in compliance with the regulations with regards to LOCA?
TECo says that natural circulation flow test showed greater flow than anti-cipated.
B&W says there is'no charge with analyses for small break.
How can TECo be sure that operator is can go into 35" level set point when there is a small break? TECo says operator has good indication, alarms, etc.
TECo says that B&W tells them that with RC pumps running the 35" level setpoint f~7N O
7 9 0 8 2 3 09'ffd
is OK for small break.
What happens when the plant has a loss of off site power and then a small break? - TEco could not answer this. They said that it would be cleaner to change to auto set point at 35" but this would take a long time and money with new ECCS analysis. They think the dual level is quickest method.
Brian Grimes said that the design should consider loss of offsite power and then a LOCA. TEco said they have not analyzed that event. We asked if this analysis is required under 50.46. We asked them to talk to B&W to check and make sure if this analysis should be in the record.
Conclusions (1) We asked TECo to look at theloss of offsite power and then a small break -
make sure they are in conformance to 50.46 (ECCS)
(2) We requested within a commitment to have a (1) a design within 60 days of permanent modifications, (2) 50.59 determination within 60 days for the mod with copy of safety analysis, (3) schedule (as early as possible - before next refueling) of the modifications.
We concluded interim fix OK and TECo has no restraints. Also let us know outcome with talk to B&W concerning compliance with ECCS 50.46.
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