ML20245C435
| ML20245C435 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 10/27/1987 |
| From: | FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML20245C423 | List: |
| References | |
| NUDOCS 8711030096 | |
| Download: ML20245C435 (1) | |
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I REACTIVITY CONTROL SYSTEMS EASES 3/4.1.1.4 MINIMUM TEMPERATURE FOR CRITICALITY
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l This specification ensures that the reactor will not be made critical with the Reactor Coolant System average temperature less than 525'F.
This limitation is required to ensure that (1) the moderator temperature coef ficient is within its analyzed temperature range, (2) the protective instrumentation is within its normal operating range, (3) the pressurizer is capable of being in an OPERABLE status with a steam bubble, and (4) the reactor pressure vessel is above its minimum RTNDT temperature.
3/4.1.2 B0 RATION SYSTEMS The boron injection system ensures that negative reactivity control is available during each mode of facility weration.
The components required to perform this function include (1) borated water sources, (2) makeup or DHR pumps, (3) separate flow paths, (4) boric acid pumps, (5) associated heat tracing systems, and (6) an emergency power supply from OPERABLE emergency busses.
With the RCS average temperature above 200*F, a minimum of two separate and redundant boron injection systems are provided to ensure single functional capability in the event an assumed failure renders one of the systems inoperable.
Allowable out-of-service periods ensure that minor component repair or corrective action may be completed without undue risk to overall facility safety from injection system failures during the repair period.
The boration capability of either system is sufficient to provide a SHUTDOWN MARGIN from all operating conditions of 1.0% ak/k af ter xenon decay and cooldown to 200*F.
The maximum boration capability requirement occurs from full power equilibrium xenon conditions and requires either 5,400 gallons of 11,600 ppm boric acid solution from the boric acid rtorage tanks or 45,000 gallons of 2,270 ppm borated water from the borated water storage tank.
The requirements for a minimum contained volume of 415,200 gallons of borated water in the borated water storage tank ensures the capability for borating the RCS to the desired level.
The specified quantity of borated water is consistent with the ECCS requirements of Specification 3.5.4.
Therefore, the larger volume of borated water is specified.
Also, the 6,000 gallons minimum BAST requirement per Specification 3.1.2.9 is conservative for this cycle.
With the RCS temperature below 200*F, one injection system is acceptable without single failure consideration on the basis of the stable reactivity condition of the reactor and the additional restrictions prohibiting CORE ALTERATIONS and positive reactivity change in the event the single injection system becomes inoperable.
The boron capability required below 200*F is sufficient to provide a SHUTDOWN MARGIN of 1.0% ak/k af ter xenon decay and cooldown from 200'F to 140'F.
This condition requires either 490 gallons of 11,600 ppm boron from the boric acid storage system or 2,502 gallons of 2,270 ppm boron from the borated water storage tank.
To envelope future cycle BWST and BAST contained borated water volume requirements, a minimum volume of 13,500 gallons and 600 gallons, respectively, are specified.
G711030096 871027 PDR ADOCK 05000302 B 3/4 1-2 p
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