ML19312E982
| ML19312E982 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 05/28/1980 |
| From: | Schneider H COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML19312E979 | List: |
| References | |
| NUDOCS 8006180289 | |
| Download: ML19312E982 (2) | |
Text
,
o gg Special Report 80-01 COMMONWEALTH EDISON CO.
ZION GENERATING STATION 50-295
.During the weekly surveillance of OB diesel driven fire pump on April 9, 1980 the pump failed to auto start.
It also failed to start on a remote manual start.
Based on these failures deviation report D-22-0-80-45 was written along with work request Z-06180.
The work request was directed to the electrical maintenance department for their investigation.
Their job notes reveal that they reset the cpeed switch and ran the pump twice on which both times it ran fine.
This work request was closed on April 10.
While performing the weekly surveillance on April 16 the pump tripped on over speed thirty seconds after it was started.
The over speed switch was then reset and the pump was restarted.
The pump then ran the necessary fifteen minutes needed for successful comple-tion of the periodic test.
Due to the initial tripping, work request Z-06341 was initiated along with deviation report D-22-0-80-48.
The work request was directed to the mechanical maintenance department for their investigation.
The work request was cancelled due to the periodic test being successfully completed.
On April 23, the weekly periodic test was completed successfully.
During the next attempt to complete the surveillance, on April 30, the pump again failed to run.
Based on these failures work request Z-06611 and another deviation report D-22-0-80-59 was written.
Because of the recent problems with this pump it was decided to do two things:
1.
Arrange for a Cummin's Service Representative to come out and check out the engine.
2.
Order a new speed switch.
The Cummin's Service Representative was on site May 5 and 6.
The Service Representative found a badly worn water pump drive belt which upon being replaced seems to have eliminated the tripping problem.
The pump electrical system is wired in such a manner that high water temperature sends a signal to the speed switch which in turn shuts down the engine.
Based on finding the bad water pump drive belt and a dirty cooling system, it was decided to put the speed switch into ctoreroom stock for future use.
The pump successfully completed the weekly periodic test on May 6.
A thorough preventive check was performed by the Cummin's Representative and the pump restored to peak operating condition.
On May 7 the engine cooling system was thoroughly flushed and refilled with anti freeze and demineralized water.
8006180 M 3
o The health and safety of the public was not affected due to
.the redundant fire pump being inoperable.
1 Prepared by: 3 6ftijiO a
Howard Schneider l
.