ML19207C053
| ML19207C053 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/06/1979 |
| From: | Fischer S EG&G, INC. |
| To: | Ybarrondo L EG&G, INC. |
| References | |
| NUDOCS 7909060376 | |
| Download: ML19207C053 (2) | |
Text
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_ April 6. 1979 To:
L. J. Ybartendo. Three-Mile Island. Harrisburg. PA From:
- 5. R. Fischer. EGaG Idaho Re:
RELAF4 TMI 51sulatica We have perfor:aed the following RELAP41111 simulations. Plots are available if needed.
t (1) A & B Steaming - 90% operating level in secondary j
(2) A Steaming - B isolated (a) 90% operating level in secondary (b) 10% operating level in secondary (c) 90% operating level but 3 PJ
(d) 90% operating level with vent valves operational a? = 0.0 to open (e) 90% operating level, vent valve stuck open (f) 90% operating level - factor of 35 increase in core resistance (31 A solid. B isoitted (a) 20 gpa on secondary water (b) 5000 gpm on secondary water f
(4) Transient to natural circulation with zero initial flow and no pu@
(a) no core blockage (b) 75% core blockage (5) Flow blockage estis: stas Condition for runs 1. 2. and 3 are as follows:
1000 psta. 5 MW. normal core resistance (exept 2f)
Transient initists4 by tripping pump allowing system to establish natural circulation.
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n uIjlbbNa 9060 g7g k
or-Page 2 of 2 Preliminary results as follons:
(1) All cases run to date indicate satisfactory corn coding (2)
In steaming sede 905 level in secondary preferable to 101 (3) In solid mde high water flew preferable in secondary (4) Run with stuck open wnt valve yielded better cooling (5) Flow bicokage estiastes indicate core resistance increase by factor of 30-50 owr nominal (6) Both SG steaming or both solid yield better cooling than single SG in these modes (7) High cere resistance run 2f yields % 25% reduction in core flow but systen still enters natural circulation cede Hote: Run 2f si.-:ulates as closely as possible the transient that will take place if the system is placed into natural circulation if loss of RC puw.
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