ML20084D858
| ML20084D858 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 08/25/1970 |
| From: | Hoyt H COMMONWEALTH EDISON CO. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| 03211, 3211, NUDOCS 8304120493 | |
| Download: ML20084D858 (2) | |
Text
!
,y_
Q',1
{
s p'
^
f v; ~~ s.$' s)t r/
^!
- o.,
x s
al
)
\\ ~.2 I
/
b,OH1111011WCD..)'l I^ M l l S O D. \\ ; O r c
O M t" rtRST N A T I O M.n L P L. A Z A % C t s l C A C. O.
ILLINORS AdJn.n ts,4 to-POST OffICL kOX 787 /; C if l C A G O, li t t N O l$ a0690 Drordca Nuclenr icuor Station R. R. El l' orris, Illinois 60450 tea ~,
i
{. n,,v' w
%) >
August 25, 1970
- W f ' 'ja.4 "
- y p:: -
y ( 3.
.s. ;
s
?;L,.\\. ( Q f y
c.
Dr. P e Le r i.. Jerris, Director
,, )
.s Division of Ronctor Licensing g'<cA, q U. S. Ato::ic Znorgy Comission
~d 1 h'achington, D. c.
205h5
'2?..E
Dear Dr. :
- orris:
SUN:7'T:
lienrme ET.9-19 I'c ~ aen "nel w c cmor St-tion Unit 2, Section 6.6.C.3 of thn iec'cM en?.b neificati one This is to report a corrlition r olating to the opern u cas of the statio-s'd eh one cf the ~ Luo n:y liquid Control rumping circuits (P.lO was fou: d Lo havc; a testa specified in section 4.4.A.l.ecptcity deficiency during the nonthly surveillance Proide" nrd Initini Action On l'onday, August 10, 1970, the routino nonthly surveillanco was perfor.,:cd on the standby liquid control system.
The results on 2A punp were satisfactory; but 23 pump indicated approximately half of rated ca-pacity.
Investigation revealed that the 23 pur.p dischargo relief valve uns lifting at approxinate3y 1100).
This resulted in dilution of the stand-by liquid control tank uith n350 gnl. of clean deninoralised unter, raising the level to 82%.
Standby liquid control pu:np 23 uns decla cd inopornble.
Daily surveillance uric begun on the redundant punp 2A.
The tank was sanulod and boron cencontration uns found to bo 12.4%.
The tank level was'lowored to ?!d to br$ng it back within normal level requiremonts.
Investi~ntion nnd Corrective Action
.03211 The valve was removed on August 12, 1970, by :naintenance and I
found to be hold epen ly crystallizcd borate solution.
1
/
The valvo was cleaned and reinstalled, a satisfactory test on g
B pump was conducted on Auguct 12, 1970.
8304120493 700825 PDR ADOCK 05000237 g
~
y SEP 2 1970 COPY SENT REGION fN/
n
i* g
~
0 O
t t
1 Dr. Poter A. :' orris Auguct 25, 1970
{
!. Station Revicu Board review concluded that the safety of the i
plant was not jropardicc0 because the systen uns operable uithin the re-I ouironent of tho Technical Specifications nrd the redundant cenponents 1
^
j operability uas demonstrated daily ~as required by the Technical Specifi-cctions.
Station personnel perfor,ed satisfactorily and in accordance with approved procedures.
It was also concluded that the crystallization at tho valve could not have nrevented its intendca relief function, and prob-ably,:ould not rescat after unintentianally exceoding its sol pressuro 3
J during the surveillance test.
/
/
l
/ /. )/l'(* &,, V s
,J-i t '~ -
11, x, yoyt HKil:dmc
.I l
i 1
l 1
i i
1 i
i i
4 1
l i
1 4
i 1
1 I
4 2
l h
\\
1 b
...