ML19310A378
| ML19310A378 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 06/06/1980 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-05, IEB-80-5, NUDOCS 8006110168 | |
| Download: ML19310A378 (2) | |
Text
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435 sium Avenue Pittsburgh, Pennsylvania 15219 June 6, 1980 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 ATTENTION:
MR. BOYCE H. GRIER, DIRECTOR
SUBJECT:
Beaver Valley Power Station.- Unit No. 2 Docket No. 50-412 I.E. Bulletin No. 80-05
~
Vacuum Condition Resulting in Damage to Chemical Volume Control System (CVCS) Holdup Tanks Gentlemen:
We have reviewed I.E. Bulletin No. 80-05 which was submitted with your letter dated March 10, 1980 which identified two instances which resulted in radioactive gaseous releases when tanks at Trojan and Rancho Seco buckled due to partial vacuum conditions.
Systems that include low pressura process or holdup tanks that can be valved to contain primary coolant must be protected against vacuum conditions. The Beaver Valley Power Station - Unit No. 2 tanks, reviewed for potential vacuum conditions were the pressurizer relief tank (Reactor Coolant System), primary drains transfer tanks (Nuclear Equipment Vent &
Drain System), coolant recovery tanks (Boron Recovery System, Beaver Valley Power Station Unit No. 1 shared system) and volume control tank (Chemical and Volume Control Syst'em).
The pressurizer relief tank, primary drains transfer tanks, and volume control tank are designed for full vacuum.
In addition, these tanks have a hydrogen and/or nitrogen cover gas maintaining a positive pressure, along with a normally closed vent line to the degasifier vapor space.
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I 9 t 80 06I10/60; $