ML19332F303
| ML19332F303 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 12/04/1989 |
| From: | Hinds J, Shafer W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| References | |
| PNO-III-89-078A, PNO-III-89-78A, NUDOCS 8912140245 | |
| Download: ML19332F303 (2) | |
Text
" ~-
~
q[PREUMINARY NOTIFICATION OF: EVENT (0R/ UNUSUAL 0CCURRE 4
[J
- ce
- Thisipreliminary notification constitutes'EARLY notice of events of POSSIBLE safetylor public
% int rest significance.
The information is'as initially received without verification-or-tvaluation,' and isLbasically'all~ that is known by the Region III staff on this date..
.LFacility:.. Commonwealth Edison Co.
Licensee Emergency G
Braidwood Unit l' Classification:
Braceville, ILL60407_
Unusual Event J
X-Alert
- (
Docket No. 50-456 Site Area Emergency General Emergency
-(
Not Applicable
)(Subjsct: _RHR RELIEF VALVE OPENS AND FAILS TO CLOSE-----(UPDATE) a OniD cember 2,1989, an Augmented Inspection Team (AIT) was established to. investigate the 1 circumstances surrounding the spurious opening of a relief valve:in the 'B' train of the j RIsidual Heat Removal (RHR) system and failure of the-valve to close.
ThaLlicensee has replaced the relief valve,.and the valve-is being held on-site pending the
- arrival' of' a manufacturer's representative to evaluate the malfunction.
Preliminary tests on the ' valve indicated. it opened at a pressure of 41.1 pounds per square inch (PSI).instead of 1,
- tha required 450 psi.. The investigation-is continuing to determine why the valve lifted at'
- the". lower pressure-and then failed to close.
Preliminary information indicates that during the incident about 68,000 gallons of water 1 drain 3d from -the primary system through the open relief valve into a radwaste holding tank.
r 1(About 14,000 gallons drained from the pressurizer in~8 minutes; the remaining 54,000. gallons were added to the primary system from the RWST using two charging pumps to raplace the water. loss.) Reactor water level in the reactor vessel remained normal throughout the event.
Aticut 30'tc 50 gallons of water were released into the auxiliary building through a leaking 1
valve on a radwaste line.
Cleanup and decontamination has been completed.
s Thi AIT-includes the Senior Resident Inspector and personnel from Region III (Chicago),'the Office'of-Nuclear Reactor Regulation,.and the Office of Analysis and Evaluation of L Operational Data.
.,lThe: State.of Illinois will be informed of this updated information.
.T,hnre has been area news media interest.
- This updated information is current as of 2 p.m., December 4,1989.
AD h
CONTACT:kTS n
388-575 FTS 3 8 5656 5:oo p
/8-/+/r7
/
8912140245 891204 I&E e s PDR PNO-III-89-ag$ PNV s
_?.
%\\
a y
^
WPRELIblINARY WOTIFICATION OF-EVENT OR-UNUSUAL OCCURRENCE--PNO-III-89-78A Date Dec;mber!4,1989 7,.3,t O
e
.2.
i y --
iDISTRIBUTION:,
HEADQUARTERS OFFICES'.
REGIONS' MAIL T0.
f' Chairman Carr.
- NMSS-Region-I.
- DCS (Orig)
"; Conn.) Roberts :
- GPA:SLITP' Region JI
, DOT (Trans.
Conn. - Rogers -
GPA:PA Region IV.
Only)
[ Conn,1Curtiss:
GPA:CA' Region V-
$ ED01'
- 0lG
. j
'DG:n. Counsell
- ASLAP.
FAX T0:
- - NRR Research INP0-
- 47 NSAC S ol.
LIC 4207'
~
"J AE0D n,
.f IRM.
NRC 0 R 3:545
- Enforcement:
W inotes a Displaywriter/PC not'an IBM 5520 Terminal.
l D
Rev 11/14/89-i.
- p a
' l t
i
?
L.
?
.g f
4 I
l I'
-