ML20206R913
| ML20206R913 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 04/15/1987 |
| From: | FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML20206R676 | List: |
| References | |
| NUDOCS 8704220292 | |
| Download: ML20206R913 (2) | |
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SURVEILLANCE REQUIREMENTS (Continued) b.
At least once per 31 days and within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> of each solution volume in-crease of 180 gallons by verifying the boron concentration of the tank solution.
c.
At least once per 31 days by verifying that power to the isolation valve operator is removed by locking the breaker in the open position.
d.
At lease once per 18 months by performing a CHANNEL CALIBRATION of each core flooding tank isolation valve closed alarm.
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PDR CRYSTAL RIVER - UNIT 3 3/4 5-2
3/4.5 EMllRGENCY CORE COOLING SYSTEMS (ECCS)
B& SEA 3/4.5.1 CORE FLOODING TANKS The OPERABILITY of each core flooding tank ensures that a sufficient volume of borated water will be immediately forced into the reactor vessel in the event the RCS pressure falle below the pressure of the tanks.
This initial surge of water into the vessel provides the initial cooling mechanism during large RCS pipe ruptures.
The limits on-volume, boron concentration and pressure ensure that the assumptions used for core flooding tank injection in the safety analysis are met.
The limits for operation with a core flooding tank inoperable for any reason except an isolation valve closed minimizes the time exposure of the plant to a LOCA event occurring concurrent with the failure of an additional tank which may result in unacceptable peak cladding temperatures.
If a closed isolation valve cannot be immediately opened, the full capability of one tank is not available and prompt action is required to place the reactor in a mode where this capability is not required.
The Core Flooding Tank Isolation Valve Closed Alarm provides a warning to operators whenever any Core Flooding Tank Isolation Valve is not fully open and the Reactor Coolant System preseure exceeds 750 psig.
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