ML20244D466
| ML20244D466 | |
| Person / Time | |
|---|---|
| Issue date: | 10/26/1984 |
| From: | Pasedag W Office of Nuclear Reactor Regulation |
| To: | Weehuizen F SWITZERLAND |
| Shared Package | |
| ML20238A944 | List:
|
| References | |
| FOIA-87-438 NUDOCS 8509230756 | |
| Download: ML20244D466 (1) | |
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Mr. F. Weehuizen
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j Bundesamt fur die Energiewirtschaft Hauptabtbilung fur die Sicherheit der Kernanlagen 5303 WURENLINGEN. Switzerland
Dear Mr. Weehuhen,
At a recent CSNI/GREST meeting I met Mr. G. Prohaska, who referred me to you as the best contact for some information concerning the S (ss experience with a specific BWR main steam isolation valve (H V). We are currently in the process of evaluating the potential for eakage of a new double-seat MSIV for a U. S. plant for which no previor s U. S.
experience exists. We understand that a similar valve is innta11ed at the Leibstatt BWR in Switzerland. Furthermore, we have heard that some difficulties were encountered in making these valves meet applicable leakage criteria.
I would appreciate any infonnation concefning the pre-operational testing and operational experience with the MSIV's on the Leibstatt plant.
If you can make the information available, our interest centers on:
'). The leak rates encountered in pre-operational testing 2IAnyadditionaltestdatafollowingstart-up
- 3. Your assessnient of the causes of leakage, particularly if excessive leakage was encountered
- 4. Corrections or modifications, if any, to the valves to improve performance.
I Your help with this issue will be much appreciated.
Sincerely, l
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Walter F. Pasedag e
1 Accident Evaluation Branch
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l Division of Systems Integration cc:
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