ML19345E670

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Proposed Tech Spec Sections 3.8.3 & 4.26.5 Re Decay Heat Removal Capability,Clarifying Actions to Be Taken When Required Reactor Coolant Loops Are Not in Operation or Are Inoperable
ML19345E670
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 01/30/1981
From:
ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19345E668 List:
References
NUDOCS 8102050467
Download: ML19345E670 (5)
v • d • e


Text

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1. Reactor Coolant Loop (A) and at least one associated reactor coolant pump.
2. Reactor Coolant Loop (B) and at least one associated reactor coolant pump.

Otherwise, restore the required loops to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or reduced the reactor coolant average temperature to less than or equal to 280 F within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

B. With the reactor coolant average temperature above 280'F, at least one of the reactor coolant loops listed above shall be in operation.

Otherwise , suspend all operations involving a reduction in boron concentration of the Reactor Coolant System and im-mediately initiate corrective action to return the required loop to operation.

3.1.1.6 Decay Heat Removal With the reactor coolant average temperature at or below 280*F, but the reactor above the refueling shutdown condition, ,

at least two of the coolant-loops listed below shall be operable, and at least one loop shall be in operation:*

1. Reactor Coolant Loop (A) and its associated steam generator and at least one associated reactor coolant pump.
2. Reactor Coolant loop (B) and its associated steam generator and at least one associated reactor coolant pump.
3. Decay Heat Removal Loop (A)**
4. Decay Heat Removal Loop (B)**

A. With less than the above required coolant loops OPERABLE, immediately initiate corrective action to re'. urn the required coolant loops to OPERABLE status as soon as possible; be in COLD SHUTDOWN within 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br />.

B. With no coolant loop in operation, suspend all operations involving a reduction in boron concentration of the Reactor Coolant System and immediately initiate corrective action to return the required ecolant loop to operation.

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  • All reactor coolant pumps and decay heat removal pumps may be de-energized for up to I hour provided (1) no operations are permitted that would cause dilution of the reactor coolant system boron con-centration, and (2) core outlet temperature is maintained at least' 10*F below saturation temperature.
    • The normal or emergency power source may be inoperable when the reactor is in a cold shutdown condition.

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3.8.3.a. At least one decay neat removal loop shall be in operation.*

Otherwise, suspend all operations involving an increase in the reactor decay heat load or a reduction in boron concentration

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of the reactor coolant system, and close all containment penetrations providing access from the containment atmosphere to the outside' atmosphere within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

b. When the water level above the top of the irradiated fuel assemblies seated within the reactor pressure vessel is less than 23 feet, two decay heat removal loops shall be operable.**

Otherwise, immediately initiate corrective action to return the required loops to operable status as soon as possible.

  • The decay heat removal loop may be removed from operation for up to I hour per 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period during the performance of core alterations.
    • The normal or emergency power source may be inoperable for each shut-down cooling loop.

BASES:

Detailed written procedures will be available for use by refueling personnel. These procedures, the above specifications, and the design of the fuel handling equipment as described in Section 9.7 of the FSAR incorporating built-in interlocks and safety features, provide assurance that nc incident could occur during the refueling operations that would result in a hazard to public health and safety. If no changa is being made in core geometry, one flux monitor is sufficient. This permits maintenance on the instrumentation. Continuous monitoring of radiation levels and neutron flux provides immediate indication of an unsafe condition.

The requirement that at least one decay heat removal-loop be in opera-tion ensures that_(1) sufficient cooling capacity is available to remove decay heat and maintain the water S4 the raactor pressure vessel at the refueling temperature (normally '40 F), sud (2) sufficient coolant circulation is maintained thror3h the reactor core to minimize the effects of a boron dilution incident and prevent boron stratification.(3)

The requirement to have two decay heat removal loops operable when_there is less than 23 feet of water above the core, ensures that a single failure of the operating decay heat removal loop will not result in a complete loss of decay heat removal capability. With the reacto: vessel head removed and 23 feet of water above the core,-a large heat sick is available for core cooling, thus in the event of a failure of the operat-ing decay heat removal loop, adequate time ls provided to initiate emergency procedures to cool the core.

The shutdown margin indicated in Specification 3.8.4 vill keep core suberitical, even with all control rods withdrawn from the core The boron concentration will be maintained above 1,800 ppm. Although this concentration is sufficient to maintain the core k < 0.99 if all the control rods were removed from the core, only a fe6f bontrol rods will be removed at any one time during fuel shuffling and replacement. The k,ff

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O SURVEILLANCE:

4.26 Decay Heat Removal APPLICABILITY:

Applies to surveillance of the decay heat removal system and to the reactor coolant loops and associated reactor-coolant pumps as needed i for decay heat removal.

OBJECTIVE:

SPECIFICATION:  !

4.26.1 The required re ctor coolant pumps shall be determined l

! operable once per aeven (7) days by verifying correct breaker alignhents and indicated power availability.

4.26.2 The required decay heat removal loop (s) shall be determined operable per Specification 4.2.2. i

~4.26.3 The required steam generator (s) shall be determined operable by verifying the secondary _ side water level to be 2. 20 inches on the startup range at-least once per 12. hours.

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. 4.26.4 The required reactor coolant-loop (s) shall be_ determined operable by verifying the required loop (s) to be in operation and circulating reactor coolant 'at least once_ per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

4.26.5 The required decay heat removal loop shall be determined to be in operation at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

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