ML20134Q174

Part 21 Rept Re Potential Maint Issues Associated w/Anker-Holth Snubbers.Owners of Anker-Holth Snubbers Will Be Informed of Problems & Sent Revs to Technical Instruction Manuals to Include Procedures for Seal & Fluid Maint

ML20134Q174
Person / Time
Site:	Monticello, Kewaunee, Point Beach, Arkansas Nuclear, Three Mile Island, Prairie Island, Brunswick, Ginna, 05000000, Trojan
Issue date:	08/29/1985
From:	Fisher R PAUL-MUNROE HYDRAULICS, INC.
To:	Deyoung R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-85, REF-PT21-85-388-000 PT21-85-388, PT21-85-388-000, TAC-08525, TAC-8525, NUDOCS 8509090198
Download: ML20134Q174 (5)

Text

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29 August 1985 Mr. Richard C. DeYoung, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Seal and Fluid Maintenance of Anker-Holth equipment snubbers.

Reference:

Letter from R. Fisher of Paul-Munroe to Owners of Anker-Holth Snubbers, dated 29 August 1985.

Dear Mr. DeYoung,

During a recent N.R.C. vendor audit at the Paul-Munroe facility in Orange California, potential maintenance issues with regard to Anker-Holth snubbers were identified. In particular, the Anker-Holth Technical Instruction Manuals do not clearly specify a maintenance program that is, at this time, consistent with current industry standards for snubber seals or fluids. To rectify this situation, Paul-Munroe will first inform the owners of Anker-Holth snubbers that these potential problems exist and then revise the Technical Instruction

, Manuals to include specific procedures for seal and fluid maintenance.

Included with this letter is a copy of the notification which has been transmitted to the owners of Anker-Holth Snubbers.

If there are any questions regarding our action on this matter, please do not hesitate to contact me at (714) 978-9600 Very truly yours, PAUL-MUNROE INCORPORATED Ene Products D v s on 4%s Y 41 Y R rd C. Fisher Director of Engineering cc: Mr. Robert L. Pettis U.S. Nuclear Regulatory Commission 7 ((gb 4

, gt RCF:kcd 8509090198 850829 PDR ADOCK 05000244 lI 0144K S PM AttachmentVFACTURING e COMPONENTS

• SYSTEMS + INSTALLATION . SERVICE

. k "E #e:n Energy Products " ' **&yt!E Teiecopier (7 )9 (714) 978 9600 29 August 1985

Dear Sirs:

This letter is to notify the owners of Anker-Holth snubbers of the possibility that seal and fluid degradation may occur in these snubbers over extended periods of time. The Technical Maintenance Instructions provided by Anker-Hol th at the time of snubber delivery has been determined to be inconsistent with what now appears to be prudent maintenance procedures for seal s and fluids. Paul-Munroe will submit revisions to the Anker-Hol th manuals in the near future. A description of these forthcoming changes is provided below.

Seal Life -

The Anker-Holth Technical Instruction Manuals define the seal service life in terms of cumulative radiation exposure. Experience shows degradation of EPR or Viton A seals occurring faster than the OEM recommended seal service life due to other aging mechanisms such as compression set and temperature. The Anker-Holth Technical Instruction Manuals will be revised to recommend a nominal seal service life of 5 years.

Reservoir Fluid Levels - The Anker-Holth Technical Instruction Manuals provide inconsistent instructions on the checking of reservoir fluid level s. The Anker-Holth Technical :nstruction Manual will be revised to recomend that the reservoir be checked during each refueling outage.

Fluid Quality - The Anker-Holth Technical Instruction Manuals provide no fluid quality guidelines or sampling interval s for Silicone base fluids. The Anker-Holth Technical Instruction Manuals will be revised to recommend the following fluid quality guidelines and sampling intervals:

MANUFACTURING . COMPONENTS . SYSTEMS

• INSTALLATION . SERVICE 2

29 August 1985 Page 2 o Fluid Cleanliness oo New fluid cleanliness level - SAE Class 4 or better oo Cleanliness level at 5 years - SAE Class 6 or better oo Sample frequency, quantity, and measurement techniques will be specified o Fluid Viscosity oo 150 - 200 centistokes at 750F + 150F o Fluid Water Content oo New fluid water content - less than or equal to 100 ppm oo Water content at specified sampling intervals - less than or equal to 150 ppm oo Water content test method - Karl Fis'1er method o Radiation exposure check - no evidence of coagulation Snubbers that have received the Paul-Munroe Tefzel seal upgrade along with new Technical Instruction Manuals are exempt from the concerns identified above.

If there are any questions regarding this matter, please do not hesitate to contact me at (714) 978-9600.

Very truly yours, PAUL-MUNROE INCORPORATED Energy Products Division i / f

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Richard C. Fisher l Director of Engineering

! cc: Richard C. DeYoung, Director l Office of Inspection and Enforcement, U.S. Nuclear Regulatory Commission l

l Robert L. Pettis, Inspector Office of Inspection and Enforcement, U.S. Nuclear Regulatory Commission l RCF:ked 0145K

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