ML093290046

Part 21 Communication Involving Wartsila Type Sacm UD45 Emergency Diesel Generating Sets Big End Bearings Installed in the Us Nuclear Power Stations of Constellation Energy at Calvert Cliffs and Xcel Energy at Prairies Island

ML093290046
Person / Time
Site:	Calvert Cliffs, Prairie Island
Issue date:	11/16/2009
From:	Dietrich D Wartsila France S.A.S
To:	Office of Nuclear Reactor Regulation
References
QSE 091116/01
Download: ML093290046 (3)

Text

fax W5rtsilj Franceýs.a.s. QSE WARTSILA Telephone +33 3 89 66 69 64 Fax +33 3 89 66 69 20 To: whom it may concern From: Daniel DIETRICH Company: U.S. Nuclear Regulatory Ref.: QSE 091116 / 01 Commission Fax No.: 01 301 816 51 51 Date: November 16th, 2009 Copy to: Pages (incl.): 2

Subject:

Part 21 communication El Urgent E] For Review 0 For Information EL Please comment EL Please Reply - ASAP PART 21 Involving Wdrtsili type SACM UD45 Emergency Diesel Generating sets Big end Bearings installed in the US Nuclear Power Stations of Constellation Energy at Calvert Cliffs and Xcel Energy at Prairies Island.

The following information is provided via fax and will be transmitted by regular mail within three days.

"COMPONENT: Big end Bearing DLT141885 all batches & DLT123351 batches A2, F2, J2 on Wdirtsild type SACM UD45 Emergency Diesel Generating sets.

"DISCUSSION: Three of four incidents which have been reported to Wdrtsili France are related to UD45 Diesel engines operating at 1500 rpm in nuclear installations. Big end Bearings damage can result in non-availability of the Diesel engine.

Wartsild France has been working on the root cause analysis after the first reported failure and has given an overall recommendation in October 2009 regarding the risks of using the above mentioned Big end Bearings on Diesel engines running at 1500 rpm (50 Hz applications).

An additional technical evaluation has been issued in November 2009 after testing a new Big end Bearing.

The actual evaluation on today is determining that this is potentially to be a reportable defect as defined by 10CFR21.

"AFFECTED USERS: UD45 engines Fax QSE 091116_Ol.doc Page 1/2

"CORRECTIVE ACTION: Being unable to predict the occurrence of such a random event, Wdirtsild France has advised its customers to:

• identify the Emergency Diesel Generating sets equipped with Big end Bearings above referenced in COMPONENT, 0 stop the utilisation of Big end Bearings above referenced in COMPONENT.

• replace all above referenced in COMPONENT Big end Bearings by a new reference PAAG129161 which has been qualified after extensive running tests on a 1500 rpm engine, Wdrtsild has not recorded, such a situation on other UD45 Diesel engines running at a lower speed of 1200 rpm (60 Hz applications) which are installed as Emergency Generating sets in Nuclear Power Plants.

Nevertheless Wdirtsild France recommendation if COMPONENTS have also been identified in 1200 rpm units installed in US Nuclear Power Plant or if such COMPONENTS are held in stock, is to replace them by the new reference Big end Bearing PAAG129161.

Best regards.

Fax QSE 091116 01.doc Page 2 / 2

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1 rue de la Fonderie - B.P. 1210 Tel. +33 389 66 68 68 F - 68054 Mulhouse Cedex Fax +33 3.89 66 68 30 With compliments With compliments 0