ML20116H203
| ML20116H203 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, Brunswick, McGuire  |
| Issue date: | 08/05/1996 |
| From: | Nelson N External (Affiliation Not Assigned) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-PT21-96 NUDOCS 9608090210 | |
| Download: ML20116H203 (5) | |
Text
l GENERAL INFORMATION or OTHER EVENT NUMBER:
30837 LICENSEE: NAK ENGINEERING, INC.
NOTIFICATION DATE: 08/06/96 CITY: SANTA ROSA REGION: 4 NOTIFICATION TIME: 16:53 [ET)
COUNTY:
STATE: CA EVENT DATE:
06/20/96 LICENSE #:
AGREEMENT: Y EVENT TIME:
12 : 00 [PDT]
DOCKET:
LAST UPDATE DATE:
08/06/96 NOTIFICATIONS NRC WOTIFIED BY: NORMAN NELSON HQ OPS OFFICER:
DOUG WEAVER VERN HODGE NRR EMERGENCY CLASS: NOT APPLICABLE 10 CFR SECTION:
CDEG 21.21(c) (3) (i)
DEFECTS / NONCOMPLIANCE EVENT TEXT POTENTIAL DEFECT AFFECTING NORDBERG DIESEL GENERATORS NAK ENGINEERING, INC. OF SANTA ROSA, CALIFORNIA, REPORTED A POTENTIAL DEFECT IN A COMPONENT OF THE NORDBERG MODEL FS1316HSC STANDBY DIESEL GENERATOR.
THERE EXISTS A POTENTIAL PROBLEM WITH THE FUEL INJECTION LINE ASSEMBLY WHICH CONNECTS THE FUEL PUMP TO THE INJECTOR.
THESE FUEL LINE ASSEMBLIES HAVE BEEN SUPPLIED TO THE MCGUIRE AND BRUNSWICK PLANTS.
NAK ENGINEERING, INC. WILL PASS THIS INFORMATION TO THE AFFECTED PLANTS.
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yo, sleeve crimping.
While corrective action procedures have been implemented, the fuel line replacement on cylinder number 4R was installed before the corrective action procedures were finalized and before i
corrective action was taken. It was further believed that this was a unique occurrence On July 30,1996 the replacement fuel line developed the same leaking problem. Since then all l
fuellines produced and furnished after July 18,1996 have been assembled using the new torque I
and tightening techniques.
All fuel line assemblies supplied before July 18,1996, either in service, or in site inventories, I
should either be returned to NAK Engineering, Inc. for examination and the crimping tightening procedures checked and verified or this work should be done on site. A written procedure will be furnished within the next 60 days to the affected sites to accomplish the necessary inspection and repairs.
1 Should anyone have any questions regarding this condition or corrective action please contact:
Nonnan E. Nelson i
NAK Engineering, Inc.
420 AviationBlvd.
Santa Rosa, Ca. 95403 l
phone: 707-542-9996 fax: 707-542-6666 l
A copy of this letter will be forwarded to all of the affected sites referenced in paragraph 2 of this letter.
Sinjerely,
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Norinan E Nelson Manager, Quality Assurance l
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NAK Engineering, Inc.
420 AV!ATION BLVD., SANTA ROSA. CA 95403 TELEPHONE: (707) 542-9996 FAX:(707) 542-6666 i
August 5,1996 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Sir,
in accordance with the requirements of Title 10, Chapter 1, Code ofFederal Regulations, Part 21, NAK Engineering, Inc. hereby notifies the Commission of a potential defect or condition in a component of the Nordberg model FS1316HSC Standby Diesel Generator. There exists a potential problem with the fuel injection line assembly which connects the fuel pump to the injector.
NAK Engineering, Inc. has supplied these fuel line assemblies to the following sites:
UTILITY SITE SERIAL NUMBER (S)
MODEL Duke Power Co McGuire 1030-1270/1273 FS 1316 HSC Carolina Power & Light Brunswick 1030-1328/1331 FS 1316 HSC On or about June 20,1996, we were advised of a single leaking fuel line assembly that occurred on McGuire Nuclear Station's Emergency Diesel Generator Unit IB, Cylinder 4R. It was determined that the leak was caused by the fuel line sleeve coming loose which eliminated the fuel connection seal.
There were no unusual engine noises, temperature changes, cylinder firing pressure changes noted prior to the fuel line leak. The operator discovered significant fuel spray emitting from the fuel pump.
At this time Duke Power initiated a ROOT CAUSE FAILURE ANALYSIS investigation and they determined that the probable cause was inadequate crimping of the fertule sleeve onto the fuel line during assembly. In order to establish corrective action, tests were conducted by Duke Power Co. at their McGuire Nuclear Station's Met Lab to evaluate dilTerent torque and tightening values to determine the values to ar.hieve optimum " crimping" of the ferrule sleeve. Samples of the same fuel line matedal, and ferrule sleeves, were provided. Duke installed the ferrule sleeves at varying torque values and conducted " pull" tests. It was concluded that the fuel line nut should be tightened i 1/8-1 1/4 turns past hand tight or 150 A lbs. of torque to achieve optimum ferrule
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ZENERAL INFORMATION or OTHER EVENT NUMBER:
30837 LICENSEE: NAK ENGINEERING, INC.
NOTIFICATION DATE: 08/06/96 CITY: SANTA ROSA REGION;_4 NOTIFICATION TIME: 16:53 (ET)
COUNTY:
STATE: CA EVENT DATE:
0'6/20/96 LICENSE #:
AGREEMENT: Y EVENT TIME:
12:00(PDT)
DOCKET:
LAST UPDATE DATE:
08/06/96 r
NOTIFICATIONS NRC NOTIFIED BY: NORMAN NELSON HQ OPS OFFICER:
DOUG WEAVER VERN HODGE NRR EMERGENCY CLASS: NOT APPLICABLE 10 CFR SECTION:
i CDEG 21.21(c) (3) (i)
DEFECTS / NONCOMPLIANCE EVENT TEXT POTENTIAL DEFECT AFFECTING NORDBERG DIESEL GENERATORS NAK ENGINEERING, INC. OF SANTA ROSA, CALIFORNIA, REPORTED A POTENTIAL DEFECT IN A COMPONENT OF THE NORDBERG MODEL FS1316HSC STANDBY DIESEL GENERATOR.
THERE EXISTS A POTENTIAL PROBLEM WITH TEE FUEL INJECTION LINE ASSEMBLY WHICH CONNECTS THE FUEL PUMP TO THE INJECTOR.
THESE FUEL LINE ASSEMBLIES HAVE BEEN SUPPLIED TO THE MCGUIRE AND' BRUNSWICK PLANTS.
NAK ENGINEERING, INC. WILL PASS THIS INFORMATION TO THE AFFECTED PLANTS.
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