ML20002A919
| ML20002A919 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 12/02/1980 |
| From: | Trimble D ARKANSAS POWER & LIGHT CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| 2-120-2, NUDOCS 8012090174 | |
| Download: ML20002A919 (2) | |
Text
_ _ _ -
ARKANSAS POWER S LIGHT COMPANY
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th POST OFFICE BOX 551 LITTLE ROCK, ARKANSAS 72203 (501)371-4000 i,
December 2, 1980 l-i L
o g
2-120e2 Director of Nuclear Reactor Regulation ATTN:
Robert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing U. S. Nuclear Regulatory Comm.
Washington, D.C.
20555
SUBJECT:
Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6 Containment Cooling Units (File: 2-1510)
Gentlemen:
Our letter of September 22, 1980 committed to provide you with information regarding the flushing operations on the ANO-2 Containment Ceoling Units. The following infonnation is therefore provided.
I_ TEM 1.
Maximum water temperature used during high temperature flushing.
0 RESPONSE: The maximum water temperature was 170 F.
ITEM 2.
Duration of flush at this temperature.
RESPONSE: Duration of flush with hot water was a minimum of 15 minutes, but in most cases lasted 30 minutes or longer.
ITEM 3.
A description of how the water temperature was monitored.
RESPONSE: Water temperature was monitored qualitatively.
If the piping was too hot to hold a hand on at the service water penetration to the Reactor Building and if hot water was obtained frcm the high point vents at the coolers, we con-cluded that the coolers contained at least 1500F water.
2000/
MEMB R MICOLE SOUTH UTIL6 TIES SYSTEM
'T Mr. Robert A. Clark, Chief December 2,1980 ITEM 4.
A description of the flushing sequence used.
RESPONSE: Hot watc, was introduced from the plant heating system, using temporary hoses, into the low point drains on each cooler unit.
The high point vents were opened to allow filling with hot water. Once hot water was obtained at the high point vents, a Reactor Building isolation valve was cracked open to provide a flow path out of the cooler to ensure that the water in the cooler remained hot.
This was continued until the piping at the Reactor Building penetration was hot to the touch.
During this sequence the Reactor Building cooling fans were secured.
Very truly yours,
- 8. d. 9%
p Manager, Licensing David C. Trimble DCT: EWE:JTE:1p