ML20058L938
| ML20058L938 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 07/31/1990 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20058L937 | List: |
| References | |
| NUDOCS 9008090023 | |
| Download: ML20058L938 (2) | |
Text
,
Dresden I DFR.1' ~
l
+
t Amendment No.
1 ASIS 1
C.
TxeLS. tor.a.gelooLHaittleytl -
To assure that there is adequate sater to shield and cool the irradiated fuel assemblies stored in the pool, a n.inimum pool veter L
level is established.
The minimum water level of 18 feet is established because it would be a significant change from the normal level,'well above a level to assure adequate cooling (just above active f uel) and above the level at which the GSEP action is initiated (5' uncontrolled loss of level w'ith level decreasing).
E.
Reactor _ Core jr To assure thet a critical assembly of nucitar fuel is no longer pot,sible in the reactor core, the placement of nuclear fuel into the rcactor core is specifically prohibited.
F.
TreLSioragelooLMa t,er_Quellty i
In December 1983, the Unit 1 fuel pool water cooling and cleanup system was taken out of service because of operational problems.
l This did n ot adversely af f ect the fuel shielding or cooling since the latest discharged fuel had been in the pool over seven years; hevever, two years of stagnation led to the growth of rnicro-organisms and the concern for microbial influenced corrosion (MIC) of pool structures.
The pool water was treated with hydrogen peroxide in i
December 1987 to kill the organisms.
Fo11cving the treatraent, the pool bottom was vacuu:ned to remove the debris. Periodic visual examinations of fuel assemblies have revealed no corrosion ef fects f rom either MIC or the long tern peroxide treatment. A continuous purification filtration system was installed in March 1989 to control the water purity.
I f
B.3/4.10-2 i
WP+4144 Fh
[h[CA@05000010 90073j I
i P
- L
.4' TECHNICAL SPECI?! CATION BASES REVISION 3.10.F In December 1983, the Unit 1 Fuel Pool Water cooling and Clean-up System was taken out of service because of operational problems.
This did not adversely affect the fuel shielding or cooling since the Pool Water level was maintained and the latest discharged fuel had been in the pool for greater than five years.
However, four years of stagnation led to the growth of micro-organisms and the concern for microbial influenced corrosion (MIC) of pool structures. A Pool Water Treatment Program was initiated in December of 1987 which includes hydrogen peroxide addition, vacuuming, and filtration. This clean-up effort _will continue until the desired cleanliness level has been reached and a Domineralization System can be put in-service to maintain water quality.
f i
ZEDE/211/2