United States Nuclear Regulatory Commission - Protecting People and the Environment

Morning Report for September 10, 1999

                       Headquarters Daily Report

                         SEPTEMBER 10, 1999

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                    REPORT             NEGATIVE            NO INPUT
                    ATTACHED           INPUT RECEIVED      RECEIVED

HEADQUARTERS        X
REGION I                               X
REGION II                              X
REGION III                             X
REGION IV                              X
PRIORITY ATTENTION REQUIRED  MORNING REPORT - HEADQUARTERS SEP. 10, 1999

Licensee/Facility:                     Notification:

Part 21 Database                       MR Number: H-99-0083
Enertech                               Date: 09/10/99


Subject: Part 21 - Pressure switch test failure because
         of set screw design


Discussion:

VENDOR: Enertech                        PT21 FILE NO: 99-36-0

DATE OF DOCUMENT: 07/14/99              ACCESSION NUMBER: 9907220113

SOURCE DOCUMENT: LETTER                 REVIEWER: REXB, C. Petrone


NEW ISSUE. The vendor Enertech reports pre-installation test failures of
ITT pressure switch model 132P5S. The vendor recently purchased this
model from ITT NeoDyn division. The switches are incorporated into
electrohydraulic valve actuator equipment for both safety-related and
commercial applications. The electrical component of the switch did not
function under vibration or cycling due to a faulty set screw design. The
previous vendor, ITT, conducted the root cause evaluation and recommends
the corrective action of rebuilding the switches to a past design
configuration. Enertech states that about 900 of these switches are
manufactured each month as commercial grade items. The problem was found
during testing of the electrohydraulic valve actuator equipment before
shipping and installation in a nuclear power plant.

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HEADQUARTERS      MORNING REPORT     PAGE  2          SEPTEMBER 10, 1999

Licensee/Facility:                     Notification:

Part 21 Database                       MR Number: H-99-0084
Inovision                              Date: 09/10/99


Subject: Part 21 - Questioned reliability of BNC connector (AMP 221552-1)

Discussion:

VENDOR: Inovision                       PT21 FILE NO: 99-38-0

DATE OF DOCUMENT: 08/27/99              ACCESSION NUMBER:

SOURCE DOCUMENT: EN 36082               REVIEWER: REXB, C. Petrone


NEW ISSUE. The vendor Inovision (formerly Victoreen) is a supplier of
radiation measurement instruments. They reported that some of the BNC
coaxial cable connectors (Victoreen type 30-4) may not meet the retention
requirements for seismic class 1 equipment when installed on a coaxial
cable in accordance with the supplied instructions. These instructions
were provided by AMP, the manufacturer of the BNC connectors. In 1992,
AMP had replaced the originally qualified part, AMP number 221552-1, with
another part, number 1-221265-0, that did not meet seismic criteria. The
instructions for the new part specify that the braided shield wires on
the cable were to be combed out (un-braided) before installation of the
BNC connector. When assembled using these instructions, the BNC connector
did not appear to perform correctly with respect to cable retention.
Subsequently, AMP provided additional guidance that the shield cable
should be left braided (not combed out) for additional strength.
Inovision tried this and found that it did improve cable retention.
However, Inovision concluded that the written instructions for assembling
the BNC connector to the cable needed clarification.

Inovision received 100 pieces of the incorrect part (AMP 1-221265-0) in
January 1997. They are performing a review to identify any of these
connectors that may have been included in parts, assemblies, or kits that
may have been supplied to their customers. They plan to complete their
review and notify all affected customers within 30 days.
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