ML20134L198
| ML20134L198 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 08/22/1985 |
| From: | Miosi A COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-PT21-85, REF-PT21-85-396-000 0543K, 543K, 85-06, 85-6, PT21-85-396, PT21-85-396-000, NUDOCS 8509030123 | |
| Download: ML20134L198 (2) | |
Text
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m one First F!ational Plaza, Chicago. Illinog
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l Address Reply to. Post Office Box 767
'x Chicago, Illinois 60690 August 22, 1985 Mr. James G. Keppler Regional Administrator U.
S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Braidwood Station Units 1 and 2 10 CFR 50.55(e) No. 85-06 Interim 30-day Report Failure of Diesel Generators to Sustain Adequate Prime NRC Docket Nos. 50-456/457
Dear Mr. Keppler:
On July 23, 1985, Commonwealth Edison Company notified your of fice of a potential deficiency reportable pursuant to 10 CFR 50.55(e) regarding 1A and 18 diesel generators' failure to sustain adequate prime during testing at our Braidwood Station.
This letter provides additional information concerning this matter and serves as an interim 30-day report until our investigations are complete.
As has been discussed with Messrs.
W.
Little, D. Williams, M.
Farber and A. Dunlop of your office, Commonwealth Edison has been investigating the diesel engine prime problem for some time.
However, since mid April 1985, human factors modifications to the Main Control Board and additional work in the Diesel Room have precluded further investigation of the problem.
On May 17, 1985 a temporary sight glass was installed on a check valve upstream of' the shaf t driven transfer pump in an attempt to further identify the cause of the problem.
Until recently this check valve was the prime suspect in our search of a cause.
We have been in close contact with our Byron station since this problem arose.
Byron had experienced priming problems in late 1984 but had resolved them by stopping air leaks in the fuel system which had occurred following modifications.
Since that time, the Byron diesels have started properly, Recently, we have determined that there is a small difference between Byron and Braidwood in the field routing of the fuel header / injection pumps return line to the day tank.
Each of these items will be investigated as a possible cause of the fuel priming problems.
In addition, Cooper / Bessemer has proposed a modification to the fuel oil system.
This design change is being reviewed.
SBA'SMESIOkR6 S
IAUG 261985p;7 t D
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. Until the diesels are ready to be operated, we are unable to complete our' investigation.
We expect to provide additional information-within 60 days.
Very truly yours, i
,htA.D.Miosi Nuclear Licensing Administrator
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/klj i
cc:
NRC Resident Inspector - Braidwood Director of. Inspection and Enforcement i
U.S. Nuclear Regulatory Commission Washington, D.C. 20555 0543K I
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