ML20094P447
| ML20094P447 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 03/30/1992 |
| From: | ENTERGY OPERATIONS, INC. |
| To: | |
| Shared Package | |
| ML20094P441 | List: |
| References | |
| NUDOCS 9204080148 | |
| Download: ML20094P447 (1) | |
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370,100 gallons of barated water ato su} plied for emergency corn cooling and reactor building spray in the event of a loss of-coolant accident.
This amount fulfills requirements for emetgency core cooling.
Approximately 16,000 gallons of borated wat er are required to reach cold shutdown.
The original nominal borated water storage tank capacity of 38n,000 gallons is based on rofueling volume requiremontr,.
llenters maintain the borated watnr supply at. a temperature to prevent crystallization and local freezing of the boric acid. The boron concentration is set at a value thst will maintain the core at least 1 percent Ak/k subcritical at 70'F without any control rods in the core.
The concentration for 1% Ak/k suberiticality is 1609 ppm boron in the core, while the minimum valu, specified in the borated water storage tank is 2270 ppm boron.
Specification 3.3.2 assures thtt above 350'F two high pressure injection pumps are also available to provide injection water as the energy of the reactor coolant system is increased.
Specification 3.S.3 assures that above 800 psig both core flooding tanks are operational.
Since their design pressure is 600 25 psig, they are not brought into the operational state until 800 psig to prevent spurious injection of borated water. Both core flooding tanks are specified as a single core flood tank has insufficient inventory to reflood the core.(1)-
Specification 3.3.4 assures that prior to going critical the redundant train of reactor building emergency cooling and spray train are operable.
The spray system utilizes common suction lines with the low pressure injection system.- If a single train of equipment is removed from either system, the other train must be assured to be operable in each system.
Reference 6 provides an assessment of the impact of level indicator instrument error on the allowed NaOH tank level variation.
Note that the indicated level variation of 34.0 + 1.0/-0.8 feet includes an allowance for instrument loop error.
When_ the reactor is critical, maintenance is allowed per Specification 3.3.5.
Operability of the specified components shall be based on the results of testing as required by Technical Specification 4.5.
The maintenance period of up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is acceptable if the operability of equipment redundant to that removed l
from service is demonstrated within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to removal.
Exceptions to Specification 3.3.6 normit continued operation fo" seven days if_one of two BWST level instrument channels is operabie or if eithe a the pressure or level instrument channel in the CFT instrument channel.s operable.
In the event that the need for emergency core cooling should occur, functioning of one train (one high pressure injection pump, one low pressure injection pump, and both core flooding tanks) will protect the core and in the event of a main coolant loop severance, limit the peak clad temperature to less than 2200*F and l
the' metal-water.eaction to that representing less than ] percent of the clad.--
l The service water system consists of two independent but interconnected, full l
capacity, 100% redundant systems, to ensure continuous heat removal.(4) l l
One service water pump is required for normal operation.
The normal operating requirements-are greater than the emergency requirements following a loss-of-coolant accident.
Amendment No. Jf0,JAE, 39 REVISED BY NRC LETTER DATED:
September 13, 1991 9204000148 920330 l
PDR ADOCK 05000313 l_
P PDR
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