ML20069A863

Final Part 21 Rept Re Secondary Containment Isolation Techno Corp Dampers Equipped W/Parker Hannifin Air Cylinders at LaSalle County Station.All Units 1 & 2 Techno Dampers Equipped W/Parker Air Cylinders Replaced

ML20069A863
Person / Time
Site:	LaSalle
Issue date:	05/17/1994
From:	Johnson I COMMONWEALTH EDISON CO.
To:	Russell W NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
References
REF-PT21-94 NUDOCS 9405260259
Download: ML20069A863 (3)

Text

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4? ./ '$ Commonw3:.lth Edison l ) 1400 Opus Place b ~ ~ ~ } . Downers Grove, Ilknois 60515 h; d May 17,1994-Mr. William T. Russell, Director i Office of Nuclear Reactor Regulation d U.S. Nuclear Regulatory Commission Washington D.C. 20555 Attn: Document Control Desk j

Subject:

Commonwealth Edison Company 10 CFR Part 21 Final Report Secondary Containment isolation Techno Dampers Equipped with Parker Air Cylinders Mr. Russell:

The purpose of this letter is to notify the NRC Staff of concerns by Commonwealth Edison Company (CECO) related to the failures of Secondary Containment isolation Techno Dampers supplied by Techno Corporation with an air cylinder manufactured by Parker Hannifin. The affected dampers provide Secondary Containment Isolation upon an automatic isolation signal.

CECO has concluded that the problem resulted from an excessive amount of rust inhibitor in the pneumatic cylinder, which caused the internal components to stick over time and at high air flow temperatures. CECO has identified and replaced all Techno dampers equipped with Parker air cylinders.

The Attachment to this letter provides CECO's notification in accordance with the requirements of 10 CFR Part 21.

As stated in the attached report, the defective component was identified only at Commonwealth Edison's LaSalle County Station. If there are any questions regarding this notification, please direct them to Luke D. Kim at (708) 663-7457. 'i Respectfully,

- / t trene M. nson /er Licensing Operations Director

Attachment:

10 CFR Part 21 Final Report cc: J. Martin, Regional Administrator - Rlli J.E. Dyer, Directorate lil-2 Director, NRR

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e Attachment 10 CFR Part 21 Final Report

' Secondary Containment isolation Techno Dampers Equipped with Parker Air Cylinders.

10 CFR Part 21 File No. 9406 May 12,1994 Applicability This notification is submitted in accordance with the requirements of 10 CFR 21, section 21.1(b), 21.3a(3), and 21.3.d(4).

Identification of Facility and Component .I l

This notification concerns Secondary Containment Isolation Dampers equipped with Parker Air Cylinders which were supplied by Techno Corp. and installed for use in a safety-related . 1 application at LaSalle nuclear power plant.  !

J No other Commonwealth Edison nuclear power plants are affected with this Part 21 notification.

Identification of Component Supplier / Manufacturer:

Techno Corporation 2709 West 10th St.

P.O. Box 1416 Erie, Pa.16512 Phone: (814) 838-4561 Parker Hannifin Corporation Cylinder Division 500 South Wolf Road DesPlaines, IL 60016 Phone: (708) 298-2400 Nature of Defect The damper 1VR05YB failed to fully close. The damper blade was obstructed from closing by the pneumatic cylinder which stuck in midstroke during the surveillance testing. The air

, cylinder was disassembled and inspected internally. CECO deterrnined that an excessive amount of rust inhibitor was present in the pneumatic cylinder's and the internal components were sticking during testing.

CECO and manufacturer representatives identified the cause of the sticking as an excessive amount of rust inhibitor (anti-oxidant Techtyl 511M) in the' pneumatic cylinder.

Parker Cylinder Division has indicated that the Anti-Oxidant Techtyl 511M was used on the piston cylinder and seals. An excessive amount of this anti-oxidant could cause the internal components to stick.

The Safety related function of these dampers is to automatically close on an ESF signal ~

and remain closed to maintain secondary containment integrity. The failure of a damper to

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'close due to a sticking actuator would not affect the integrity of secondary containment as long as the other dr.per in series with it is closed. If one of the damper actuators stuck concurrent with .: single active f ailure of the other damper, the result would be the loss of secondary containment integrity. Secondary containment integrity is required to ensure that 10 CFR 100 limits as well as the GDC 19 limits are not exceeded.

Date of Discovery On March 22,1994, an evaluation of this issue was initiated for Part 21 reportability. On May 12,1994, CECO concluded that the Techno damper air cylinder f ailure was attributed to inadequate process control by the manufacturer Parker Cylinder Division. Additionally, CECO determined that, although the classification of the pneumatic cylinder was not safety '

related, the sticking of the cylinder could have adverse safety impact for certain applications.

Number and Location of All Defective Component Within CECO, the Techno Dampers equipped with Parker air cylinders are only installed at LaSalle Nuclear Station. The dampers provide automatic Secondary Containment isolation.

The affected Dampers are:

1VR04YA,1VR04YB,1VR05YA,1VR05YB 2VR04YA,2VR04YB,2VR05YA,2VR05YB Corrective Actions Commonwealth Edison's immediate corrective action was to identify the locations of all Techno dampers equipped with Parker air cylinders. It was determined that only LaSalle Station has the potentially defective air cylinders.

An operability determination of all Techno dampers equipped with Parker air cylinders was completed on February 25,1994.

All the Unit 1 and 2 Techno dampers equipped with Parker cylinders were replaced betw3en February 1 and May 1,1994 with the same model cylinders without the rust inhibitor.

In the future, the air cylinders for these valves will be dedicated safety related, in addition to the standard dedication checklist, the dedication process willinclude a check for ,

excessive rust inhibitor.

- Contacts Questions peitaining to this notification should be addressed to:

Luke Kim (708)663 7457 Nuclear Engineering and Technology Services Commonwealth Edison Company 1400 Opus Place, Suite 400 Downers Grove, 111. 60515.  ;

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