ML20086Q334
| ML20086Q334 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 08/17/1973 |
| From: | Meyer R PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8402270516 | |
| Download: ML20086Q334 (2) | |
Text
,
9 O
PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET f^w,,
, ',\\
. 3w PHILADELPHI A PA.19101
< ' ' \\
^
< kh
<I',r D d
~
(215) 841-4ooo
]
5 AUG23 B73" i a em "C" b
August 17, 1973 i
Q l
s.
M,;,
g;i; ;.cM Q
Mr. A. Giambusso I4 Deputy Director of Reactor Projects United States Atomic Energy Cenmission Directorate of Licensing Washington, D. C. 205h5
Reference:
Peach Botton Atonic Power Station - Unit #2 Facility Operating License DFR-M Docket No. 50-277
Subject:
Abnormal Occurrence
Dear Mr. Gianbusso:
During the initial fuel loading operation on 8/9/73, the refueling interlocks were found to be inoperable. This event was reported to Mr. Tom Shedlowksy, A.E.C. Eegicn 1 Regulatory Operation Office, on 8/10/73 In accordance
~
with Section 6.7.2.A of the Technical Specification Appendix A of DPR-S for Unit #2 Peach Botton Atcmic Power Station, this occurrince is being reported to the Directorate of Licensing as an Abnormal Occurrence.
Prior to the start of initial fuel loading operations on Unit #2, the refueling interlock surveillance test ST 12.1 was performed. This test was successfully completed on 8/8/73 on afternoon shift. Actual fuel loading operations were started on 6/9/73 at 7:55 p.m.
After loading the first seven elements, the reactor operator noted that the rod block annunciator was not actuated each time the refueling platform was moved over the reactor vessel. Fuel loading operations were immediately halted to investigate.
Investigation The investigation of this failure revealed that one of the refueling plat-form bridge travel position switches had failed. The second switch also showed signs of distress. Switch failure was~ caused by a mechanical inter-ference problem between the switch and a portion of the track on which it rides. Subseouent discussions with several reactor operators concerning the rod block annunciator indicated that the switch failure probably occurred during a fuel loading training exercise performed shortly after the refueling interlock surveillance test was completed.
8402270516 730817 gDRADOCK05000
(
gy COPY SENT REGION
/,._
~
O o
I
- Corrective Action The defective switches were repirred and adjusted. Pepairs were made to Following installation the linit switch track to prevent a recurrence.
of the new linit switches, surveillance test ST 12.1 was successfully Verbal instructions repeated before fuel loading operations were resumed.
have been given to the recetor operator to be alerted to failure of the rod block annunciator to sound as the refuel bridge passes over the core.
Safety Irn11 cations The initial fuel loading operation is controlled by a detailed procedure Personnel involved in the fuel loading which defines each step precisely.
operation have been inctructed to follow this procedure without deviation.
The loadine operation is under the control of a Senior Licensed Cperator and is being monitored by PE Conpany and Ceneral Flectric engineers both on the refueline floor and in the control room. Proper adherence to the initial fuel loading procedure adninistratively establishes controls which provide for a safe fuel loading operation without the reliance on No operations were performed during the loading the refueling interlocks.
of the first seven elenents or subsecuently that would have actuated the The failure of these interlocks, therefore, did refuelinc interlocks.
not present any hazard to the plant, plant personnel, or to the public health or safety.
Very truly yours, hddlbl s
R. D. Meyer, G eral Superintendent Generation Division Electric Production Department RDM:jfb Mr. Janes P. O'Reilly cc.
Director, Regulatory Operations, Region 1 United States Atenic EnerFy Connission Directorate of Pegulatory Operations, Pegion 1 631 Park Avenue King of Prussia, Pennsylvania 19h06 q
'