ML20085D824
| ML20085D824 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 10/09/1991 |
| From: | Blosser J, Taylor M UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 91-04, 91-4, ULNRC-2497, NUDOCS 9110170189 | |
| Download: ML20085D824 (3) | |
Text
--.
Uivion Is,uccrmc r
radaway Fbnf October 9, 1991 U. S. Nuclear Regulatarv Commissica Document Control Desl<
Washington, DC 20 % 5 UlSRC-2497 Cont 1 arte 1:
DOCKET NUMBER 50-483 CALIAWAY FIANT UNIT 1 FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 91-04 60 METi.R VIND DIRECTION INSTRUMENTATION INOPERABLE FOR GREATER TilAN 7 DAYS DUE TO A BLOWN FUSE This Special Report is submitted in accordance with Technical Specification 3.3.3,'6 actAon uratement (a). The 60 meter wind direction instrumentation was inoperable for more than 7 days due to a blown fuse to the wind direction trar.smitter.
n Oj
/E J. D. Bloss-i-Manager, Callaway Plant JDB/ ' /MNF/Irj cc-Distribution attached
' 9119170189 911009
'PDR ADOCK 05000433
/1 -
S POR
- /' 'g ki l
q
. k%Iiry AcJress: PO Bnx 620, foton, MO ffEI
o.
M-
-ec distribution for UI.NRC 2497 Mr, A'.-Bert Da'els
'Mr. M. David L nch (2 copies)
/
Regional Administrator' U.S. Nuc1 car _Rugulatory Commission U.S; Nuclear ;1egulatory Commission OWFN - tiall Stop 13E21 Region III_ _
Washington D.C 20555 799 Roosavelt Road G'.en ' Ellyn, I L 60137 Manager, Electrie Department Mr. liarold I;. Che.noff Missouri Public Service Commission Supervisor Licensing P.O. Box 360 Wolf Creek Nuclear 0;) crating Corp.
Jefferson City, MO 65102 P. O. Box 411 Burlington, Kar sas 66839 Records Center Mr. - R. L. llague Institute of Nuclear Power Operations Chief. Project Section 3C Suite 1500 U.S. Nuclear Regulatory Commission 1100 circle 75 Parkway Region III-Atlanta, CA 30339 799 Roosevelt Road Glen Ellyn, IL 60137 NRC Senior Resident Inspector W
i j..
l l ?-
~
GPECIAL REPORT 91-04' 60' METER VIND DIRECTION INSTRUMENTATION INOPERABLE FOR GREATER TlisN 7 DAYS DUE TO A Bl.0VN FUB This:roport is submitted in.tecordance with Tn:hnical Specification 3,3.3.4 action statement (a) which states: "With one or more required meteorological monitoring channels inoperable for more than 7 days, prepare and submit a Specini Report to the Ccmmission pursuant to Specification 6.9.2 within the next_cen days outlining tho cause of the malfunction and the plans for restoring the channel (s) to OPEMBhE status. "
OnL9/27/91, at approximately 0100-CDT, a licensed reactor __ operator. selected the Meteorological Tower Data computer screeo ind logged that the-10 meter and 60 meter wind direction values were shown in red rather than the normal green, lie compared this screen with a group dl splay screen of-the came parameters which showed the word " good" adjace it to the values. He discussed the condition with other licensed oparators on his crew. They concluded " good" meant the sensor was operatire and-they attributed the red indication values to a wind variation between the 10 meter and 60 meter elevations.1There have been similar.. previous red indications associated
.with calm. (r.o wind) weather cor.ditions.
P on 10/4/91~ at 1026, a utility Instrun:entation and Controls technician discovered the condition during monthly preventive maintenance on the 60 meter wind direction recorder lie initiated a repair work -request. His l
investigation of the recorder printout revealed the channel was inope'rable since 9/23/91 at 0700 as evidenced.by a contiruous reading at 359 degrees.
On 10/5/91 at 1239; the1 damaged wind direction t:cansmitter was replaced, retested and the 60-meter wind-direction instiumont was declared operable.
The transmitter had failed-due to a blown fust d-
' Enhancements to the operator's logs will improve the. channel check criteria to ensure timely diutovery of a similar condition.
1 This di6_ nat pose a potential concern for any dose _ proj ection c alculations -
which may hast been performed during the period of the 60 meter wind direction inop.vab).11ty. The invalid wind dire ction signal would have provey+.ed th6 idGmatic modeling do e calculation _ at 60 meters, Plant procedures And backup wind direction indication at 90 and 10 meterr would-have led to corrtet dose calculations if they had been required.
-. -