ML20032E784
| ML20032E784 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 11/03/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Delgeorge L COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8111230085 | |
| Download: ML20032E784 (1) | |
Text
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!! SIC R. Tedesco TERA A. Schwencer TIC Project flanager ACRS fl. Service I&E f.U fir. Louis 0. Del George Director of riuclear Licensing Commonwealth Edison Compaby NOV 3 m 8, Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Del George:
Subject:
La Salle Secondary Containment Leakage Test In your letter of October 1,1981, you requested that we modify the requirement defined on pages 6-33 of our Safety Evaluation Report to remove the provision for measuring the inleakage rate. You intend to abide with the requirenent to test the ability of the standby gas treatment systen (SBGTS) to drawdown the secondary containment pressure to the prescribed value in five minutes.
Yo't also stated that the staff's requirement, which you had previously adopted, cannot be acconplished in any practical manner. This requirement was for conducting a test to verify the inleakage assumption used in the secondary containment analysis.
The primary purpose of the secondary containment leak test is to denonstrate the capability of the SBGTS to overcoae the inleakage of air and drawdown in the secondary containment to a pressure of -0.25 inch water gauge within 5 minutes following onset of a LOCA and maintain the prescribed negative pressure.
Since knowledge of the actual inleakage rate is not required as long as the SBGTS is shown to be cahable of restoring the vacuum in the secondary containment to -0.25 inch water gauge in 5 minutes, you proposed that the requirement to measure the inleakage rate be deleted. We concur with you, provided that the SSGTS test is started at conditions simulating those conditions that are expected in the secondary containment at the onset of a LOCA.
If you desire any further discussion, please contact ifr.
.\\. Bournia, Licensing Project Manager
- 1) 492-8196.
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