ML20106F323
| ML20106F323 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/12/1984 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 2NRC-4-166, 84-08, 84-8, NUDOCS 8410300186 | |
| Download: ML20106F323 (3) | |
Text
y e.
4
- e
., $ VL
'Af Duquestie Lidit 2gggg (412)923-1960 Nuclear Construction Division Telecopy (412) 787-2629 Robinson Plaza. Building 2 Suite 210 October 12, 1984 Pittsburgh, PA 15205 United States Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, PA 19406 ATTENTION:
Dr. Thomas E. Murley Administrator
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 Potential Cracking / Breakage of the Lube Oil Pump Bosses on the Diesel Generators Significant Deficiency Report No. 84-08, Final Report Gentlemen:
This final report is in reference to the reportable significant deficiency relating to pot enti al cracking / breakage of the lube oil pump bosses on the diesel generators.
Pursuant to the requirements of 10CFR 50.55(e), it is anticipated that no additional reports will be submitted to Regiot 1.
DUQUESNE LIGHT COMPANY By E." J. Woolever Vice President JS/wjs Attachment cc:
Mr. R. DeYoung, Director (3) (w/a)
Ms. M. Ley, Project Manager (w/a)
Mr. E. A. Licitra, Project Manager (w/a)
Mr. G. Walton, NRC Resident Inspector (w/a)
INPO Records Center (w/a)
NRC Document Control Desk (w/a)
SUBSCRIBED AND S "I
/ d DAY OF L m, 1984.
8410300186 841012 d
d kQ Notary Public PDR ADOCK 05000412 PDR ANITA ELAINE REITEf;, NOTARY PUBLIC ROBINSON TOWNSHIP, ALLEGHENY COUNTY s
MY COMMIS$10N EXPIRES OCTOBER 20,1986 l \\ J :L 7-
p-4
.Unitsd Stats 3 Nucicer Ragulatory Commission
- Dr. Thosts.E. Murley Page 2 COMMONWEALTH-0F PENNSYLVANIA )
)
SS:
COUNTY OF ALLEGHEhT
)
On this
/ M day of
/((
, before me, a Notary Public in and for said Comnonwealth and County, personally appeared E. J. Woolever, who being duly sworn, deposed and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge.
Notary Public ANITA ELAINE REITER, NOTARY PUBUC ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20.1986
g BEAVER VALLEY POWER STATION - UNIT NO. 2 DUQUESNE LIGHT COMPANY Report on Significant Deficiency No. 84-08 Potential Cracking / Breakage of the Lube Oil Pump Bosses on the Diesel Generators 1.
SUMMARY
During factory tests of the first Colt-Pielstick PC-2.3 diesel generator set, constructed for LILCO's Shoreham Nuclear Power Station, a broken boss was discovered on the engine-driven lube oil pump discharge nozzle.
The engine-driven lube oil pump on the second LILCO diesel generator set was examined by Colt, and the boss area was found to be cracked.
A broken / cracked. boss significantly reduces the sealing area between the pump and an adapter which screws into the boss.
This condition, were it to occur on the Shoreham engines or the similarly designed BVPS-2 engines (model PC-2), could permit oil leakage sufficient to prevent operation of the af fected engine.
2.
IMMEDIATE ACTION TAKEN On September 24, 1984, Mr.
S.
D.
Hall, Lead Compliance Engineer in Duquesne Light Company's (DLC) Regulatory Af fairs Department, notified Mr. Lowell Tripp of NRC Region I of this reportable deficiency.
3.
DESCRIPTION OF THE PROBLEM The engine-driven lube oil pumps on certain Colt diesel generator sets (models PC-2, PC2.3,'
and PC-5),
are supplied with a tapered thread adapter which screws into the pump boss.
Overtorquing of the tapered thread adapter can result in breaking or cracking of the pump boss. Boss f ailures -have occurred on the LILCO engines and are a potential problem for the Colt engines at BVPS-2.
4.
ANALYSIS OF SAFETY IMPLICATIONS The emergency diesel generators are required during design basis events to supply electric powe r to various safety-related components and ESF systems. The cracking or breaking of the lube oil pump bosses, should it occur with sufficient severity on the BVPS-2 engines, could prevent a diesel generator from performing its intended safety functions.
- Thus, the safe operation of the plant under design basis event conditions could be adversely af fected.
5.
CORRECTIVE ACTION TO REMEDY DEFICIENCY The tapered thread adapters on the lube oil pumps of the Colt diesel generator sets at BVPS-2 will be replaced with adapters having straight threads with an undercut, thus eliminating the potential for overtorquing the threaded adapters. The thraaded hole in the boss has straight threads and does not require modification.
The replacement of the tapered
- adapters will be completed prior to fuel load.
- 6. -ADDITIONAL REPORTS It is anticipated that no additional: reports will be issued in regards to this issue.
. - ~
,-