ML19327A625
| ML19327A625 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 07/07/1980 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Draper E GULF STATES UTILITIES CO. |
| References | |
| NUDOCS 8008060510 | |
| Download: ML19327A625 (1) | |
Text
-
I i ~..*7s?~ n %s i ).+ ir. f.l. $ T t,J _?*
-l
?,
- l. i k 3 :, ::
- d&*.
. s,;, * ;., -;, {y,.,.4.
- S.* *? ' *.=[ ; :~~'o N'.JCLEAR REGULATORY COMMISSION i
[S-REGION IV n
<I)
C 811 RYAN PLAZA DRIVE. SUITE 1000
~ 'rh.
, ' h f ARLINGTON, TEXAS 76012 a'
k ',<
o8 i
July 7, 1980 i
...1:..>..
.....w._
.~:..,
..u.
Iri Reply Refer To:
RIV Docket Nos. 50-458/IE Bulletin No. 80-17 50-459/IE Bulletin No. 80-17 Gulf States Utilities ATTN:
Dr. E. Linn Draper, Jr.
Vice Presider.t - Technology P. O. Box 2951 Beaumont, Texas 77704 Gentlemen:
The enclosed IE Bulletin No. 80-17, is forwarded to you for information.
No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely,
,f ff/bcd Karl V. Seyfrit '
Director
Enclosure:
IE Bulletin No. 80-17 8008060
'E> l O
- % n y..;f y;p:.nia :h.. :l..y b_S..: - s. i ~.:;.6. v.;;,.Q...Quy.M. m,..:.+:.r.
- a. H :~ :.. e; :n9.;. p;,..u.; 7,'., a SSINS No.:
6820 Accession No.:
8005050076
.. < <.s.J:: :.:- v.nc y....:s. :,,
t.;A<...w
.w.+. yv. -
g.. - H. - w c.
- '< :..: a :. n..' ~. -.v.e n -
NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFOR N NT JULY 3, 1980 IE BULLETIN NO. 80-17 FAILURE OF 76 0F.185 CONTROL RODS TO' FULLY INSERT DURING A SCRAM AT A BWR Description of Circumstances:
On June 28,1980, 76 of the 185 control rods failed to fully insert during a routine shutdown at TVA's Browns Ferry Unit No. 3 located at Athens, Alabama. The reactor was manually scrammed from about 30 percent power in accordance with routine shutdown procedures.
The shutdown was initiated to repair the feedwater system.
The 76 control rods that failed to fully insert were all on the east side of the core.
Following scram discharge volume (SDV) high level bypass and a chort drain period of the SDV, a second manual scram was initiated and all partially inserted rods were observed to drive inward, but 59 remained partially withdrawn.
A third manual scram was made, again following high level in the SDV and bypassing for another short drain of the SDV, with the result that 47 rods remained partially withdrawn.
Following a longer drain of the SDV, an automatic scram occurred that was initiated by a scram discharge volume tank high water level signal when the scram reset switch was placed in " Normal"; with this scram all remaining rods fully inserted.
The total time elapse from the initial scram to the time that all rods were inserted was approximately 15 minutes.
Core coolant flow, temperature and pressure remained normal for plant conditions.
The unit is now shutdown and additional testing indicates that a possible cause of the malfunction was the retention of a significant amount of water in the east bank s cam discharge volume.
In view of these interim findings and pending results of continued investigation, the following actions are to be taken.
Actions To Be Taken By Licensees:
All General Electric Boiling Water Reactors with operating licenses which are operating at any power on the date. of this Bulletin shall perform the following steps in the. time stated.
T-performthefollowingstepspriortoo;j DUPLICATE DOCUMENT i.
1.
Within 3 days from the date of thi l Entire document previously tests to verify that there is no entered into system under:
Discharge Volume (SDV) and associU ANo 8006C@O76 arcoperableandventsystemis{
No. of pages:
T
=
S mw
.s
.-..,,.e---,,.,.
-,.,.,