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Valve Service - GB

1

INVESTIGATION INTO ELIMINATING

ENGRG. JOB

Valve Engrg. - SMC

1

THE USE OF LUBRICANTS

PROJECT NO.

JL

1

ON THE NP SERIES OF VALVES.

PREPARED BY

ASCO Controls, L.P.

SUBJECT OF THIS REPORT:

Preface:

Quality Control - GP

1

Administration - LG

1

VALVE DEPARTMENT

ASCO NP LINE OF VALVES

DATE

MANAGER

ENGINEERING REPORT

REPORT NO.

DISTRIBUTED TO: Valve Sales - RM

QTY.

1

This report supersedes Engineering Report (ER) 351 R1 and the original version of the report ER 351. This report is being issued to provide additional data and analysis justifying the use of Nicotef coating of the stem and discs of the NP8300 valves. The additional testing discussed in this revision provides a performance comparison between valves using the new design, including the Nicotef coating, and the prior valve constructions which used lubricants. This report also summarizes the relevant portions of the NS qualification program report (AQR 21691) which included valves with the Nicotef coating and includes this information as an appendix to this revised report. This appended NS performance information helps establish qualification for the modified NP valves and eliminates the need for customers to read and evaluate the entire NS qualification program report.

Other portions of the report, that addressed the discontinuance of lubricants for the other valve styles, remains unchanged and in effect. Therefore the sections dealing with the removal of lubricants will continue to be included as part of this report.

Introduction:

Effective May 26, 1999 ASCO discontinued using lubricants during certain assembly steps of the NP series valves. The decision to discontinue using lubricants was driven by the belief of some utilities that lubricants used in the assembly of ASCO Nuclear valves results in sticking of the core to the plug-nut. Although extensive testing performed at ASCO was never successful in replicating the sticking reported in the field, ASCO made the decision to eliminate the use of lubricants, where possible, in order to lessen this concern with the utilities.

351R2A 71005

--- S. Casadevall 5/25/04

SMC 5/25/04

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