ML19225C816
| ML19225C816 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 07/03/1979 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML19225C813 | List: |
| References | |
| NCR-MEB-79-22, NUDOCS 7908020485 | |
| Download: ML19225C816 (1) | |
Text
=4 < r ENCLOSURE SEQUOYA1; NUCLEAR PLANT UNITS 1 AND 2 ERCW VALVE POSITIONING NCR MEB 79-22 l.'
FINAL REPORT 10 CFR 50.55 (e)
Description of Deficiercy On a safety injection signal the valves on the discharge side of the component cooling system (CCS) heat exchanger C are automatically energized These valves (PCV-67-151 header A, FCV to the full open position.
(ERCW) 152 header B) control the flow of essential raw cooling waterThe ERCW System is designed exchanger.
through the tube side of the heat exchanger with the necessary flow is provided through the heat so that only one valve open.
loss of offsite power and a failure of
'In the event of a concurrent power train A the open!ng of both valves would cause excess ERCV train B flow through heat exchanger C.
This would result in insufficient flow in the rest of ERCW train B.
Safety Implication Statement The reduction of the required flow through the ERCW train B components exchanger C in the event of a loss of offsite other than the CCS heat in inadequate cooling power and a failure of power train A would resultThis lack of cooling would adversely of required safety-related equipment.to achieve safe shutdown.
affect the ability of the plant Corrective Action
~ *~
All automatic opening signals to the ERCW header A valve (FCV-67-151) 1.
will be removed bef ore initial criticality of Unit iA37 288 70 0802 o/ grg;~
f
. - ~
.