ML20086J485
| ML20086J485 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 09/20/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086J487 | List: |
| References | |
| AO-74-5, NUDOCS 8401240036 | |
| Download: ML20086J485 (2) | |
Text
a ab a-e
&+Mh.
3 O
O o
PHILADELPHIA ELECTRIC COMPANY
"['
2301 MARKET STREET g}
p g% p-PHILADELPHIA. PA.19101 u.s. gg**'
. u!
2isi 841-4ooo j
s:..; vs, u;a na.*
j w
1 c)
September 20, 1974 Mr. A. Giambusso Deputy Director of Reactor Projects
. United States Atomic Energy Commission Directorate of Licensing Washington, DC 20545
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. W. Baunack, A.E.C. Region 1 Regulatory Operations Office on September 11, 1974.
Written notification was made to Mr. James P. O'Reilly, Region 1 Regulatory Operations Office on September 11, 1974.
In accordance with Section 6.7 2.A of the Technical Specifications, Appendix A of DPR-56 for Unit 3 Peach Bottom Atomic Power Station, the following report is being submitted to the Directorate of Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-56, Amendment Number 1 Technical Specification 3 5 0 Report No.:
50-278-74-5 Report Date:
September 20, 1974 Occurrence Date: September 10, 1974 Facility:
Peach Bottom Atomic Power Station R. D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:
Unit 3 Emergency Shutdown Panel RCIC static inverter tripping from operation of the Barometric Condenser Condensate Pump.
Conditions Prior to Occurrence:
The reactor was operating at approximately 22% power with the RCIC in test at the Emergency Shutdown Panc1.
8401240036 740920 9860 PDR ADDCK 05000278
.' COPY SENT REGION __
2
Mr. A. Giambusso Szptember 20, 1974
\\
Page 2 s-Description of Occurrence:
During the test run of the RCIC from the Emergency Shutdown Panel, the static inverter feeding the RCIC flow controller at the Emer-gency Shutdown Panel tripped repeatedly upon automatic starting of the RCIC Barometric Condenser Condensate Pump. Each time, it was immediately reset.
Designation of Apparent Cause of Occurrence:
Investigation points to a failure in the trip circuitry of the particular inverter unit.
i i
Analysis of Occurrence:
(;
r=~rw n w u.w m u--
--.-.~~~.
~.__
?
At the time of the inverter trippings, all other Unit 3 Emer-gency Core Cooling Systems were operable. Due to this, and the short time intervals that the inverter was in a tripped condition, this occurrence has minimal safety significance.
Corrective Action:
~
The inverter unit was replaced with a spare. A storage oscilloscope was installed to monitor inverter input and output during i
the testing. This spare inverter did not trip throughout the remainder of the RCIC testing at the Emergency Shutdown Panel.
The input filter network as outlined in A0-50-277-74-40 is
~
in progress, in that two'of six filters have been installed.
Failure Data:
Five other trippings of RCIC inverters have been reported as:
A0-50-277-74-14, 20, 37, 39, and 40.
Very truly yours,
/
f'tYL4 M.
. Cooney f
Ass' t Gen' t Supe'rintendent Generation Division cc:
Mr. J. P. O'Reilly Director, Region !
United States Atomic Energy Commission 631 Park Avenue King of Prus'sia, PA 19406 e
(
m