ML11117A306

Notification of Part 21, Potential Defect in Magnetrol Level Switch from Engine Systems Incorporated

ML11117A306
Person / Time
Site:	Monticello
Issue date:	04/15/2011
From:	Horner T Engine Systems
To:	Office of Nuclear Reactor Regulation, NRC/RGN-II, NRC/RGN-III
References
46760
Download: ML11117A306 (5)

Text

0411512011 4/U.S. NuclearRegulator, Commission Operations Center Event Report PareI Part 21 (PAR) Event# 46760 Rep Org: ENGINE SYSTEMS, INC Notification Date I Time: 04/15/2011 17:29 (EDT)

Supplier: ENGINE SYSTEMS, INC Event Date / Time: 04/15/2011 (EDT)

Last Modification: 04/15/2011 Region: 1 Docket #:

City: ROCKY MOUNT Agreement State: Yes County: License #:

State: NC NRC Notified by: TOM HORNER Notifications: KATHLEEN O'DONOHUE R2DO

-'HQ Ops Officer: JOHN KNOKE STEVE ORTH R3DO Emergency Class: NON EMERGENCY PART 21 GROUP email 10 CFR Section:

21.21 UNSPECIFIED PARAGRAPH POTENTIAL DEFECT IN MAGNETROL LEVEL SWITCH FROM ENGINE SYSTEMS INCORPORATED "Engine Systems, Incorporated (ESI) began an evaluation of a level switch on February 16, 2011. Monticello Nuclear Plant returned a level switch for failure evaluation. The reported condition was that the switch mechanism would not actuate throughout the entire level range. ESI supplied the level switch in July, 2008. The switch was functionally tested prior to shipment and it worked properly at that time. It remained in customer inventory until recently when it was tested and the problem was identified.

"This level switch is used in the fuel oil day tank of some EMD 999 emergency diesel generators and controls the fuel transfer pump. Malfunctioning of this switch could prevent the fuel transfer pump from operating and therefore the diesel generator could shut down due to insufficient fuel supply; thus preventing the diesel generator from performing its safety related function. The EMD 999 fuel system also incorporates a backup fuel transfer pump that is controlled by the level alarm switch within the day tank. The backup transfer pump turns on when the low level alarm is actuated and turns off when the high level alarm actuates.

"ESI has been conducting tests and inspections of the returned level switch and will be coordinating with the manufacturer (Magnetrol) to complete our evaluation. To date, no other similar failures with this Magnetrol level switch have been reported to ESI."

Component: Magnetrol level switch, ESI P/N: 8277780-ESI, Magnetrol type A10 Report No: 10CFR21-0101-INT

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Received at: 04/15/2011.17:29 04-15-11;05:33PM; # 1/ 4 SZ3ENGINE SYSTEMS, INC.

175 Freight Road, Rocky Mount, NO 27804 Telephone: 252/977-2720 Fax:

Nzýý 2S2/446-1134 TELEFAX Date: April 15, 2011 Company: NRC Operations Center Fax Number: 301/816-5151 Verification No.: 301/816-5100

Reference:

Report No. 10CFR21-0101-INT, Rev, 0 From: Tom Homer Page: 1 of 4 Dear Sir Following this cover is a copy of our Interim Report 10CFR21 -0101 -INT, Rev.0, for a 1QCFR21 deviation evaluation regarding a Magnetrol level switch, ESI P/N:

8277780-ESI, Magnetrol type Al 0.

A copy of the report will be mailed to the NRC Document Control Desk.

Should you have questions, please let us know.

Sincerely, ENGINE SYSTEMS, INC.

Tom Homer Quality Assurance Manager Quality Performance With Pride

04-15-11;05:33PM; # 2/ 4 n/

EB'd ENGINE SYSTEMS, INC.

175 Freight Road, Rocky Mount, NC 27804 Telephone: 252/977-2720 Fax. 252/446-1134 Report No. 10CFR21-0101-1NT Rev. 0: 04/15/11 INTERIM REPORT 10CFR21 REPORTING OF DEFECTS AND NON-COMPLIANCE COMPONENT: Magnetrol level switch ESI P/N: 8277780-ESI Magnetrol type A10 SYSTEM: Emergency Diesel Generator - fuel oil system CONCLUSION: Not yet completed Prepared By: Date: 4//C//

Engineering Manager Reviewed By: Date: .- 222L-//

Quality Assurance Manager Quality Performance With Pride

04-15-11;05:33PM; # 3/ 4 Report No. 10CFR21-101-INT Record of Revisions Page: I of 1 REV DATE PAGE DESCRIPTION 0 04/15/11 Initial issue.

04-15-11;05:33PM; # 4/ 4 Report NO, 100FR21-101-1NT Revision: 0 Date: 04/15/11 Page: 1 of 1 COMPONENT:

Magnetrol level switch ESI P/N: 8277780-ESI Magnetrol type A10 PURPOSE:

This interim report is being issued because Engine Systems, Inc. (ESI) is not able to complete an evaluation of an identified deviation within the 60 day requirement of 1 0CFR21.21. The evaluation is expected to be completed no later than May 15, 2011.

SUMMARY

ESI began an evaluation of a level switch on February 16, 2011. Monticello Nuclear Plant returned a level switch for failure evaluation. The reported condition was that the switch mechanism would not actuate throughout the entire level range. ESI supplied the level switch in July, 2008, The switch was functionally tested prior to shipment and it worked properly at that time. It remained in customer inventory until recently when it was tested and the problem was identified.

This level switch is used in the fuel oil day tank of some EMD 999 emergency diesel generators and controls the fuel transfer pump. Malfunctioning of this switch could prevent the fuel transfer pump from operating and therefore the diesel generator could shut down due to insufficient fuel supply; thus preventing the diesel generator from performing its safety related function. The EMD 999 fuel system also incorporates a backup fuel transfer pump that is controlled by the level alarm switch within the day tank, The backup transfer pump turns on when the low level alarm is actuated and turns off when the high level alarm actuates.

ES! has been conducting tests and inspections of the returned level switch and will be coordinating with the manufacturer (Magnetrol) to complete our evaluation.

To date, no other similar failures with this Magnetrol level switch have been reported to ESI.