United States Nuclear Regulatory Commission - Protecting People and the Environment

ACCESSION #: 9511020336

Rosemount Nuclear Instruments      Rosemount Nuclear Instruments, Inc.
                                   12001 Technology Drive
                                   Eden Prairie, MN 55344 USA
                                   Tel 1 (612) 828-8252
                                   Fax 1 (612) 828-8280

October 26, 1995

Re:  Additional Information Regarding Notification under 10 CFR Part 21
     of July 12, 1995, Revision to Instruction Manual 4235.

Rosemount Nuclear Instruments, Inc. (RNII) is writing to inform you of an
additional issue in an old revision to Instruction Manual 4235 for the
Model 1152 nuclear qualified transmitter.  You were previously notified
in the July 12, 1995 letter that the October 1992 revision to Instruction
Manual 4235 inadvertently specified an incorrect process O-ring for use
with 1152 High Differential Pressure Transmitters (Model 1152HP).  The
previous revision to Instruction Manual 4235, dated January 1988,
specified the correct O-ring for use with these transmitters.  An older
revision, revision A, dated 11/82 also specifies the incorrect O-ring for
the 1152 High Differential Pressure Transmitters (Model 1152HP).

Model 1152 transmitters are offered in Gage, Absolute, Differential and
High Differential pressure types.  Process O-rings are used to seal the
sensor module to the process flange interface.  The material of the
process O-ring is ethylene propylene rubber for all types of Model 1152
transmitters.  Model 1152HP transmitters are specified with process
O-rings having a higher durometer (hardness rating) than process O-rings
specified for Gage (except Range 9 and 0), Absolute, or Differential
types.  The higher durometer O-ring provides sealing of the process
flange interface when subjected to operating pressures up to the
specified 4500 psig over the specified operating temperature range of the
1152 High Differential Pressure transmitter.

RNII has revised Instruction Manual 4235 to specify the correct process
O-ring kit part number and distributed them to users.  This revision, MAN
4235A00 dated July 1995 should be used for all Model 1152 transmitters
(except Model 1152 T0280) regardless of the shipment date.

1.0  Name and address of the individual providing the information:

     Mr. Mark Van Sloun
     Vice President & General Manager
     Rosemount Nuclear Instruments, Inc.
     12001 Technology Drive
     Eden Prairie, MN 55344

FISHER-ROSEMOUNT

Additional information to 10CFR21 Notification
Instruction Manual 4235
October 26, 1995

2.0  Identification of items supplied:

     Instruction Manual 4235, Revision A (dated 11/82), for the Model
     1152 transmitter incorrectly specified a lower durometer process O-
     ring kit to be used with Model 1152 High Differential Pressure
     transmitters (Model 1152HP).  The Instruction Manual states on page
     17, Table 3, "1152 Spare Parts", O-ring for Process Flange, Range
     Code 3-8, Model 1152HP kit part number 01152-0067-0001.  The correct
     kit part number for this O-ring for Process Flange is 01152-0067-
     0002.

3.0  Identification of firm supplying the item:

     Rosemount Nuclear Instruments, Inc.
     12001 Technology Drive
     Eden Prairie,       MN    55344

4.0  Nature of the failure and potential safety hazard:

     The difference between the process O-rings is the durometer
     (hardness rating).  The Model 1152HP, Range Code 3-8, transmitters
     are specified to use a process O-ring having a higher durometer than
     Model 1152 Gage (Except Range Code 9 and 0), Absolute, or
     Differential types.

     RNII does not have sufficient information to determine the safety
     impact related to plant applications.  Licensees must determine the
     impact on plant operations and plant safety and take action as
     deemed necessary.

FISHER-ROSEMOUNT

Additional information to 10CFR21 Notification
Instruction Manual 4235
October 26, 1995

5.0  The corrective action which is taken, the name of the individual or
     organization responsible for that action and the length of time
     taken to complete that action:

     RNII has revised Manual 4235.  The current manual, MAN 4235A00,
     revision July 1995 was distributed to users October 13, 1995.

     Mr. Van Sloun is responsible for any further action related to this
     issue.

6.0  Any advice related to the potential failure of the item:

     The end user must determine the full scope of this deviation as it
     relates to plant operations and plant safety and take action as
     deemed necessary.

Rosemount Nuclear Instruments, Inc. has a strong commitment to the
nuclear industry and assures you that we are dedicated to the supply of
high quality products and services to our customers.  We are sorry for
any inconvenience.  If there are any questions, or you require additional
information related to this issue, please contact Tim Layer (612)
828-8240 or Jane Sandstrom and Ian Baldry (612) 828-8250.

Sincerely,

ROSEMOUNT NUCLEAR INSTRUMENTS, INC.

M. L. Van Sloun
Vice President & General Manager

MVS:JDS

FISHER-ROSEMOUNT

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