ML20034A287
| ML20034A287 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 04/10/1990 |
| From: | ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20034A286 | List: |
| References | |
| NUDOCS 9004200733 | |
| Download: ML20034A287 (2) | |
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l CONTAINMENT SYSTEMS-SURVEILLANCE REQUIREMENTS 4.6.2.3 Each containment cooling group shall be demonstrated OPERABLE:
a.
At least once per 14 days by:
1.
Verifying-a service water flow rate of 2 1250 gpm to each group of cooling units; each unit within the group having an operable' fan, or by verifying a service water flow rate of 2 1250 gpm to one unit within the group; that unit having an operable fan.
2.
Addition of a biocide to'the service water during the surveillance in 4.6.2.3.a.1 above, whenever service water temperature is between 60 F and 80 F.
b.
At least once per 31 days-by:
1.
Starting (unless already operating) each operational cooling unit frot the control room.
2.
Verifying that each operational cooling unit operates for at i
least 15 minutes.
At least once per 18 months-by verifying that each cooling unit c.
I starts automatically on a CCAS test signal.
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j ARKANSAS - UNIT 2 3/4 6-15 Amenment No. 14, 25, 29, t
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'l e-CONTAINMENT SYSTEMS-i b
BASFS The containment cooling system and the containment spray system are redundant to each other in providing post-accident cooling of the containment atmosphere.
As a result of this redundancy in cooling capability,-the allowable out-of-service time-requirements for the containment cooling system have been appropriately adjusted.
However, the-l allowable out of service-time requirements for the containment spray system have been maintained consistent with-that assigned other inoperable ESF equipment since the containment spray system also provides a mechanism for removing iodine from the containment atmosphere.
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The' addition of a biocide to the service water system is performed during containment cooler c:7veillance to prevent buildup of Asian clams in the-coolers when :;&rvice water is pumped through the cooling coils.
This is performed when service water-temperature is between 60 F'and 80 F since in this water temperature range Asian clams can spawn and produce l
larva which could pass through service water system strainers, 1
3/4.6.3 CONIAINMENT ISOLATION VALVES i
The OPERABILITY of the containment isolation valves ensures that the containment atmosphere will be isolated from.the outside environment in j
the event of a release of radioactive material to the containment atmosphere or pressurization of the containment.
Containment isolation j
within the time limits specified ensures that the release of radioactive material to the environment will be consistent with the assumptions used in l
the analyses for a LOCA.
3/4.6.4 COMBUSTIBLE GAS CONTROL The OPERABILITY of the equipment and systems required for the detection and control of hydrogen gas ensures that this eq'11pment will be j
available to maintain the hydrogen concentration within. containment below its flammable limit during post-LOCA conditions.
Either recombiner unit is capable of controlling the expected hydrogen generation associated with 1) zirconium-water reactions, 2) radiolytic decomposition of water, and 3) corrosion of metal within containment.
These hydrogen control systems are consistent with the recommendations of Regulatory Guide 1.7 " Control of Combustible Gas Concentrations in Containment Following a-LOCA", March 1971.
The containment recirculation units are provided to ensure adequate mixing of the containment atmosphere following a LOCA.
This mixing action i
will-prevent localized accumulations of hydrogen from exceeding the i
flammable limit.
1 ARKANSAS - UNIT 2 B 3/4 6-4 Amendment No. 26, i
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