ML19347A789
| ML19347A789 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/22/1980 |
| From: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| 2-090-28, 2-90-28, NUDOCS 8009300242 | |
| Download: ML19347A789 (2) | |
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ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 LITTLEROCK. ARKANSAS 722o3 [501)371-4422 Septenber 22, 1980 WILLIAM CAVANAUGH lli Vice President Generation a constnetion 2-090-28 Director of Nuclear Reactor Regulation i
ATTN: Mr. Robert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing U. S. Nuclear Regulatory Comm.
Washington, D.C.
20555 l
SUBJECT:
Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6 Containment Cooling Units (File 2-1510)
Gentlemen:
This letter is to confirm comitments made via telephone conversations between Mr. Leon Engle and menters of our staff.
We are currently in the process of removing an accumulation of Asian clams from the ANO-2 containment cooling units (CCUs).
In addition to nhysical cleaning, our efforts will includc various flushing operations, some with high temperature water.
The pu, pose of high temperature flushing is to kill any live clams remaining in the CCUs.
Per Mr. Engle's request, we will provide the following information following completion of the cleaning operations:
1.
Maximum water temperature used during high temperature flushing.
2.
Duration of flush at this temperature.
3.
A description of how the water temperature was monitored.
4.
A description of the flushing sequence used.
In addition, for a period of two weeks following the return of the CCUs to service, we will perform a flow verification test as described in
. Technical Specification 4.6.2.3.a.1 at an increased frequer..y of once per 2 days.
The chlorination required by Technical Specification 4.6.2.3.a.2 will continue to be perfonned at 14 day intervals.
This will assure that
%..m MEMBER MiOOLE SOUTH UTIUTIES SYSTEM
j Mr. Robert A. Clark, Chief September 22, L80 I
the required service water flow is not blocked by clams killed by high t
temperature flushing as described above.
Following this two week period
)
flow verification testing will return to a frequency of once per 14 days
)
as required by the Technical Specifications. Although we feel that the 14 day testing frequency required by the Technical Specifications is adequate to assure operability of the CCUs at all times, we are comiting
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I to an increased frequency of testing for a period of two weeks in order to resolve concems by members of your staff relative to the short tenn effects of high temperature flushing.
Ver truly yours, a
~
William Cavan gh III WC:DRH:1p I
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