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United States Nuclear Regulatory Commission - Protecting People and the Environment


                                                       OMB No.:  3150-0011
                                                       NRCB 90-01

                                UNITED STATES
                        NUCLEAR REGULATORY COMMISSION
                    OFFICE OF NUCLEAR REACTOR REGULATION
                           WASHINGTON, D.C.  20555

                                March 9, 1990


NRC BULLETIN NO. 90-01:  LOSS OF FILL-OIL IN TRANSMITTERS MANUFACTURED 
                         BY ROSEMOUNT


Addressees:

All holders of operating licenses or construction permits for nuclear power 
reactors.

Purpose:

This bulletin requests that addressees promptly identify and take 
appropriate corrective actions for Model 1153 Series B, Model 1153 Series D, 
and Model 1154 transmitters manufactured by Rosemount that may be leaking 
fill-oil.

Description of Circumstances:

NRC Information Notice No. 89-42, "Failure of Rosemount Models 1153 and 1154 
Transmitters," dated April 21, 1989, was issued to alert industry to a 
series of reported failures of Rosemount Models 1153 and 1154 pressure and 
differential pressure transmitters.  The reported failures occurred at 
Northeast Utilities' Millstone Unit 3 between March and October 1987.  
Subsequent investigation into the cause of the failures by Rosemount 
confirmed that the failure mode was a gradual loss of fill-oil from the 
transmitter's sealed sensing module.

Discussion of Safety Significance:

The performance of a transmitter that is leaking fill-oil gradually 
deteriorates and may eventually lead to failure.  Although some failed 
transmitters have shown symptoms of loss of fill-oil prior to failure, it 
has been reported that in some cases the failure of a transmitter that is 
leaking fill-oil may be difficult to detect during operation.  An undetected 
transmitter failure has a greater adverse effect on safety system 
reliability than a failure that would be readily detectable during normal 
operation.  For example, electronic circuit malfunctions are routinely 
detected either by observing instrument channel readout or during periodic 
surveillance tests.  Transmitter failures that are not readily detectable 
increase the potential for common mode failure and may result in the 
affected safety system not performing its intended safety function.  This 
common mode failure potential is of increased concern when transmitter 
designs are particularly susceptible to loss of fill-oil.




9003050148
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Discussion:

Model 1151, 1152, 1153, and 1154 Rosemount transmitters are utilized 
extensively in nuclear power plants.  Model 1153 and 1154 transmitters are 
supplied by Rosemount as both seismically and environmentally qualified 
equipment.  Model 1152 transmitters are supplied by Rosemount only as 
seismically qualified equipment.  Model 1151 transmitters are supplied by 
Rosemount as commercial-grade equipment.

Rosemount has indicated, to date, that failure of approximately 91 Model 
1153 Series B, Model 1153 Series D, and Model 1154 transmitters due to loss 
of fill-oil from a glass to metal seal failure have been confirmed.  Since 
the sensing module is sealed, loss of fill-oil cannot be visually confirmed 
without destructive analysis of the sensing module.  NRC staff review of 
this issue has identified additional Model 1153 and 1154 transmitters with 
symptoms indicative of loss of fill-oil that may not have been brought to 
Rosemount's attention.  Thus, the number of Model 1153 and 1154 transmitters 
that have experienced a loss of fill-oil may be even greater than that 
confirmed by Rosemount.

Model 1153 Series B, Model 1153 Series D, and Model 1154 transmitters, 
because their construction incorporates the use of a metal o-ring, appear to 
be particularly susceptible to loss of fill-oil due to a glass to metal seal 
failure.  Accordingly, the NRC staff believes that the degree of 
susceptibility of these transmitters to loss of fill-oil warrants their 
being subjected to an enhanced surveillance program.  In addition, certain 
manufacturing lots of Model 1153 Series B, Model 1153 Series D, and Model 
1154 transmitters have been identified by Rosemount as having had a high 
failure fraction due to loss of fill-oil.  Specific information needed to 
identify transmitters that are from these suspect lots has been provided to 
industry by Rosemount concurrent with Reference 4.  Accordingly, the NRC 
staff believes that this additional degree of susceptibility warrants not 
utilizing these suspect lot transmitters in the reactor protection or 
engineered safety features actuation systems.

Rosemount has indicated that failures of Model 1151 and 1152 transmitters 
due to loss of fill-oil have also been confirmed.  The construction of Model 
1151, 1152, and 1153 Series A transmitters is similar to that of Model 1153 
Series B, Model 1153 Series D, and Model 1154 transmitters (i.e., the 
utilization of a glass to metal seal) except the construction of Model 1151, 
1152, and 1153 Series A transmitters incorporates an elastomeric o-ring 
instead of a metal o-ring.  The NRC staff does not, at present, have 
sufficient information to effectively address the susceptibility of Model 
1151, 1152, and 1153 Series A transmitters to loss of fill-oil.  Therefore, 
in order to obtain relevant operational experience data, addressees are 
encouraged to report Model 1151, 1152, and 1153 Series A, as well as Model 
1153 Series B, Model 1153 Series D and Model 1154 transmitters that may have 
exhibited symptoms indicative of loss of fill-oil or have been confirmed to 
have experienced a loss of fill-oil to the Nuclear Plant Reliability Data 
System (NPRDS).  In addition, while enhanced surveillance of Model 1151, 
1152, and 1153 Series A transmitters is not specifically requested by this 
bulletin, addressees are encouraged to undertake such efforts on Model 1151, 
1152, and 1153 Series A transmitters utilized in either safety-related 
systems or systems installed in accordance with 10 CFR 50.62 (the ATWS 
rule).  
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Rosemount has indicated that they have instituted additional quality control 
and quality assurance steps in the manufacturing process and modified 
specifications on bolt torque to reduce stress levels.  These changes should 
minimize the potential for Model 1153 Series B, Model 1153 Series D, and 
Model 1154 transmitter failures due to loss of fill-oil.  As a result, 
Rosemount has indicated that transmitters of these types manufactured after 
July 11, 1989 are not subject to their May, 1989 10 CFR Part 21 
notification.  The NRC staff has not, to date, received operational 
experience data that indicates that Model 1153 Series B, Model 1153 Series D 
and Model 1154 transmitters manufactured after July 11, 1989 are as 
susceptible to loss of fill-oil as those manufactured prior to July 11, 
1989.   Accordingly, while enhanced surveillance of transmitters of these 
types manufactured after July 11, 1989 is not specifically requested by this 
bulletin, addressees are encouraged to undertake such efforts on these 
transmitters if they are utilized in either safety-related systems or 
systems installed in accordance with 10 CFR 50.62 (the ATWS rule).  In 
addition, Model 1153 Series B, Model 1153 Series D and Model 1154 
transmitters manufactured after July 11, 1989 that exhibit symptoms 
indicative of loss of fill-oil or are confirmed to have experienced a loss 
of fill-oil should be reported in accordance with the report requirements of 
this bulletin.

The NRC staff encourages utilities to work collectively under the guidance 
of a technical industry organization to develop and analyze an operational 
experience database concerning all models of Rosemount transmitters.  The 
NRC staff will continue to obtain and analyze operational experience data 
pertaining to Model 1151, 1152, 1153, and 1154 transmitters.  Further 
regulatory action, such as requesting expansion of enhanced surveillance 
activities to include Model 1151, Model 1152, and Model 1153 Series A 
transmitters and Model 1153 Series B, Model 1153 Series D and Model 1154 
transmitters manufactured by Rosemount after July 11, 1989 or requesting 
replacement of additional suspect lot transmitters, may be taken if 
warranted. 

Addressees may have obtained transmitters that were manufactured by 
Rosemount or that contain Rosemount manufactured sensing modules from a 
number of different sources.  The following information is provided to 
facilitate addressee's identification of transmitters that were manufactured 
by Rosemount or that contain Rosemount manufactured sensing modules:

-    Rosemount has indicated that unauthorized remanufacturers and 
     refurbishers exist for Model 1151 transmitters.  Unauthorized 
     remanufacturers and refurbishers may also exist for Model 1152, 1153, 
     and 1154 transmitters.

-    All Model 1153 and 1154 transmitters, whether obtained directly from 
     Rosemount, obtained through intermediary suppliers, or provided as an 
     integral part of another component (such as an emergency diesel 
     generator), should a) indicate manufacture by Rosemount, b) have a 
     distinctive Rosemount model and serial number, c) have the physical 
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     profile characteristics of a Rosemount transmitter, and d) have a blue 
     or stainless steel housing.  Rosemount has indicated that Model 1153 
     and 1154 transmitters are not provided to other manufacturers for 
     resale under a different brandname.  In addition, a simplified diagram 
     that describes the typical physical characteristics of a Rosemount 
     transmitter is provided by Attachment 1.

-    Model 1152 transmitters, except as noted below, should a) indicate 
     manufacture by Rosemount, b) have a distinctive Rosemount model and 
     serial number, c) have the physical profile characteristics of a 
     Rosemount transmitter, and d) have a blue or stainless steel housing.  
     Rosemount has indicated that they have supplied Model 1152 transmitter 
     sensing modules to Bailey Controls (formerly Bailey Meter).  Bailey 
     manufactured transmitters that contain Rosemount manufactured Model 
     1152 sensing modules have gray housings that appear slightly different 
     than Rosemount housings.

-    Model 1151 transmitters, except as noted below, should a) indicate 
     manufacture by Rosemount, b) have a distinctive Rosemount model and 
     serial number, c) have the physical profile characteristics of a 
     Rosemount transmitter, and d) have a blue housing.  Model 1151 
     transmitters manufactured by Rosemount may have been supplied for use 
     in nuclear power plants by other original equipment manufacturers.  
     These transmitters should have the physical profile characteristics of 
     a Rosemount transmitter and have a blue housing.  Fisher Controls may 
     also offer for resale under their own brandname Model 1151 transmitters 
     purchased from Rosemount.  These transmitters should have the physical 
     profile characteristics of a Rosemount transmitter, but have a green 
     housing.

The earliest symptom a Model 1153 Series B, Model 1153 Series D, or Model 
1154 transmitter may exhibit during normal operation prior to failure if it 
is leaking fill-oil is:

-    a sustained drift

The symptoms a Model 1153 Series B, Model 1153 Series D, or Model 1154 
transmitter may exhibit during normal operation subsequent or immediately 
prior to failure if it is leaking fill-oil include:

-    a sustained drift

-    an abrupt decreasing drift (for high range gauge or absolute 
     transmitters)

-    a change in process noise including amplitude variations, 
     "one-sided-noise," or asymmetric noise distributions

-    slow response to or inability to follow planned or unplanned plant 
     transients

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The symptoms a Model 1153 Series B, Model 1153 Series D, or Model 1154 
transmitter may exhibit during calibration activities if it is leaking 
fill-oil include:

-    inability to respond over the entire design range

-    slow response to either an increasing or decreasing test pressure

-    a sustained zero or span shift

The NRC staff believes these symptoms can also be utilized to detect Model 
1151, 1152, and 1153 Series A transmitters that may be experiencing a loss 
of fill-oil.

The NRC staff has reviewed the information which has been provided by 
Rosemount, including References 1, 2, 3, and 4, to assist industry in 
detecting transmitters that may be leaking fill-oil.  The NRC staff has 
concluded that Rosemount has provided sufficient bases to support their 
proposed diagnostic procedures (trending calibration data, trending 
operational data, sluggish transient response, and process noise analysis) 
for detecting whether a transmitter may be leaking fill-oil.  Accordingly, 
the actions requested in this bulletin are intended to reflect these 
diagnostic procedures.  However, the NRC staff has concluded that Rosemount 
has not provided sufficient bases to support their proposed methodology 
(pressure versus time-in-service) for identifying which transmitters should 
be subject to an enhanced surveillance program.  Specifically, the NRC staff 
believes that the methodology utilized by Rosemount to support their 
proposed pressure versus time-in-service criteria for identifying which 
transmitters should be subject to an enhanced surveillance program does not 
provide the necessary high degree of confidence that this failure mode will 
not occur.

Rosemount had initially indicated that Model 1153 Series B, Model 1153 
Series D, and Model 1154 transmitters that were experiencing a loss of 
fill-oil should fail within approximately 36 months of in-service time.  
Recent information indicates that the rate of loss of fill-oil is 
application and pressure dependent.  Although transmitters subject to 
continuous high-pressure (e.g. reactor operating pressures) may fail within 
this timeframe, transmitters utilized in low-pressure systems or not subject 
to continuous high-pressure may take longer to fail.

General Design Criterion (GDC) 21 "Protection System Reliability and 
Testability" of 10 CFR 50, Appendix A requires the protection system to be 
designed for high functional reliability and with sufficient capability to 
allow periodic testing of its functioning when the reactor is in operation 
in order to readily detect failures of subcomponents and subsystems within 
the protection system as well as loss of the required protection system 
redundancy as they occur.  10 CFR 50.55a(h) requires that protection systems 
meet the Institute of Electrical and Electronics Engineers Standard: 
"Criteria for Protection Systems for Nuclear Power Generating 
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Stations" (IEEE-279).  IEEE-279 states that means shall be provided for 
checking, with a high degree of confidence, the operational availability of 
each system input sensor during reactor operation.  Thus, the NRC staff 
concludes that facilities that utilize transmitters that may be particularly 
susceptible to loss of fill-oil may not be in full compliance with these 
regulations because undetected transmitter failure could occur.  
Accordingly, the NRC staff requests that addressees take the actions 
requested below. 

Requested Actions:

Operating Reactors

All holders of operating licenses for nuclear power reactors are, within 120 
days after receipt of this bulletin, requested to:

1.   Identify Model 1153 Series B, 1153 Series D, and Model 1154 pressure or 
     differential pressure transmitters, excluding Model 1153 Series B, 1153 
     Series D, and Model 1154 transmitters manufactured by Rosemount 
     subsequent to July 11, 1989, that are currently utilized in either 
     safety-related systems or systems installed in accordance with 10 CFR 
     50.62 (the ATWS rule).

2.   Determine whether any transmitters identified in Item 1 are from the 
     manufacturing lots that have been identified by Rosemount as having a 
     high failure fraction due to loss of fill-oil.  Addressees are 
     requested not to utilize transmitters from these suspect lots in the 
     reactor protection or engineered safety features actuation systems; 
     therefore, addressees are requested to develop and implement a program 
     to replace, at the earliest appropriate opportunity, transmitters from 
     these suspect lots in use in the reactor protection or engineered 
     safety features actuation systems.

3.   Review plant records (for example, the three most recent calibration 
     records) associated with the transmitters identified in Item 1 above to 
     determine whether any of these transmitters may have already exhibited 
     symptoms indicative of loss of fill-oil.  Appropriate operability 
     acceptance criteria should be developed and applied to transmitters 
     identified as having exhibited symptoms indicative of loss of fill-oil 
     from this plant record review.  Transmitters identified as having 
     exhibited symptoms indicative of loss of fill-oil that do not conform 
     to the operability acceptance criteria should be addressed in 
     accordance with the applicable technical specification.  Transmitters 
     identified as having exhibited symptoms indicative of loss of fill-oil 
     that do not conform to the operability acceptance criteria and are not 
     addressed in the technical specifications should be replaced at the 
     earliest appropriate opportunity.

4.   Develop and implement an enhanced surveillance program to monitor 
     transmitters identified in Item 1 for symptoms of loss of fill-oil.  
     This enhanced surveillance program should consider the following or 
     equally effective actions:

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     a)   Ensuring appropriate licensee personnel are aware of the symptoms 
          that a transmitter, both during operation and during calibration 
          activities, may exhibit if it is experiencing a loss of fill-oil 
          and the need for prompt identification of transmitters that may 
          exhibit these symptoms;

     b)   Enhanced transmitter monitoring to identify sustained transmitter 
          drift;

     c)   Review of transmitter performance following planned or unplanned 
          plant transients or tests to identify sluggish transmitter 
          response;

     d)   Enhanced awareness of sluggish transmitter response to either 
          increasing or decreasing test pressures during calibration 
          activities;

     e)   Development and implementation of a program to detect changes in 
          process noise; and 
          
     f)   Development and application to transmitters identified as having 
          exhibited symptoms indicative of loss of fill-oil of an 
          appropriate operability acceptance criteria.  Transmitters 
          identified as having exhibited symptoms indicative of loss of 
          fill-oil that do not conform to the operability acceptance 
          criteria should be addressed in accordance with the applicable 
          technical specification.  Transmitters identified as having 
          exhibited symptoms indicative of loss of fill-oil that do not 
          conform to the operability acceptance criteria and are not 
          addressed in the technical specifications should be replaced at 
          the earliest appropriate opportunity. 

5.   Document and maintain in accordance with existing plant procedures a 
     basis for continued plant operation covering the time period from the 
     present until such time that the Model 1153 Series B, 1153 Series D, 
     and Model 1154 transmitters from the manufacturing lots that have been 
     identified by Rosemount as having a high failure fraction due to loss 
     of fill-oil in use in the reactor protection or engineered safety 
     features actuation systems can be replaced.  In addition, while 
     performing the actions requested above, addressees may identify 
     transmitters exhibiting symptoms indicative of loss of fill-oil that do 
     not conform to the established operability acceptance criteria and are 
     not addressed in the technical specifications.  As these transmitters 
     are identified, this basis for continued plant operation should be 
     updated to address these transmitters covering the time period from the 
     time these transmitters are identified until such time that these 
     transmitters can be replaced.  When developing and updating this basis 
     for continued plant operation, addressees may wish to consider 
     transmitter diversity and redundancy, diverse trip functions (a 
     separate trip function that may also provide a corresponding trip 
     signal), special system and/or component tests, or (if necessary) 
     immediate replacement of certain suspect transmitters.

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Construction Permit Holders

1.   All construction permit holders that anticipate receiving an operating 
     license within 120 days after receipt of this bulletin are requested to 
     perform Items 1, 2, 4, and 5 of Requested Actions for Operating 
     Reactors within 120 days after receipt of this bulletin.

2.   All construction permit holders that do not anticipate receiving an 
     operating license within 120 days after receipt of this bulletin are 
     requested to, prior to the date scheduled for fuel loading, complete 
     Items 1 and 4 of Requested Actions for Operating Reactors and to 
     address the intent of Items 2 and 5 of Requested Actions for Operating 
     Reactors by:

     a)   Identifying and replacing Model 1153 Series B, 1153 Series D, and 
          Model 1154 transmitters from the manufacturing lots that have been 
          identified by Rosemount as having a high failure fraction due to 
          loss of fill-oil that are installed in the reactor protection or 
          engineered safety features actuation systems; and

     b)   Documenting and maintaining in accordance with existing plant 
          procedures a basis for continued plant operation that addresses 
          transmitters that, subsequent to fuel loading, are identified as 
          exhibiting symptoms indicative of loss of fill-oil that do not 
          conform to the established operability acceptance criteria and are 
          not addressed in the technical specifications covering the time 
          period from the time these transmitters are identified until such 
          time that these transmitters can be replaced.

Reporting Requirements:

Operating Reactors

1.   Provide, within 120 days after receipt of this bulletin, a response 
     that:

     a)   Confirms that Items 1, 2, 3, 4, and 5 of Requested Actions for 
          Operating Reactors have been completed.

     b)   Identifies the indicated manufacturer; the model number; the 
          system the transmitter was utilized in; the approximate amount of 
          time at pressure; the corrective actions taken; and the 
          disposition (e.g., returned to vendor for analysis) of Rosemount 
          Model 1153 Series B, Model 1153 Series D, and Model 1154 
          transmitters that are believed to have exhibited symptoms 
          indicative of loss of fill-oil or have been confirmed to have 
          experienced a loss of fill-oil.  This should include Model 1153 
          Series B, Model 1153 Series D and Model 1154 transmitters 
          manufactured after July 11, 1989. 
          
     c)   Identifies the system in which the Model 1153 Series B, 1153 
          Series D, and Model 1154 transmitters from the manufacturing 
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          lots that have been identified by Rosemount as having a high 
          failure fraction due to loss of fill-oil are utilized and provides 
          a schedule for replacement of these transmitters which are in use 
          in the reactor protection or engineered safety features actuation 
          systems.

2.   Model 1153 Series B, Model 1153 Series D and Model 1154 transmitters 
     that, subsequent to providing the response required by Item 1 above, 
     exhibit symptoms of loss of fill-oil or are confirmed to have 
     experienced a loss of fill-oil should be reviewed for reportability 
     under existing NRC regulations.  If determined not to be reportable, 
     addressees are requested to document and maintain, in accordance with 
     existing plant procedures, information consistent with that requested 
     in Item 1 b) above for each transmitter identified.

Although not required by this bulletin, addressees are encouraged to report 
information consistent with that requested in Item 1 b) above through the 
Nuclear Plant Reliability Data System (NPRDS) for all Rosemount Model 1151, 
1152, 1153 and 1154 transmitters that exhibit symptoms indicative of a loss 
of fill-oil or are confirmed to have experienced a loss of fill-oil.

Construction Permit Holders

1.   All holders of construction permits that anticipate receiving an 
     operating license within 120 days after receipt of this bulletin are 
     required to, within 120 days after receipt of this bulletin, provide a 
     response that: 

     a)   Confirms that Items 1, 2, 4, and 5 of Requested Actions for 
          Operating Reactors have been completed; and

     b)   Identifies the system in which the Model 1153 Series B, 1153 
          Series D, and Model 1154 transmitters from the manufacturing lots 
          that have been identified by Rosemount as having a high failure 
          fraction due to loss of fill-oil are utilized and provides a 
          schedule for replacement of these transmitters which are in use in 
          the reactor protection or engineered safety features actuation 
          systems.

2.   All holders of construction permits that do not anticipate receiving an 
     operating license within 120 days after receipt of this bulletin are 
     required to, prior to the date scheduled for fuel loading, provide a 
     response that confirms that Item 2 of Requested Actions for 
     Construction Permit Holders has been completed.

3.   Model 1153 Series B, Model 1153 Series D and Model 1154 transmitters 
     that, subsequent to providing the response required by Item 1 or 2 
     above, exhibit symptoms of loss of fill-oil or are confirmed to have 
     experienced a loss of fill-oil should be reviewed for reportability 
     under existing NRC regulations.  If determined not to be reportable, 
     addressees are requested to document
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     and maintain, in accordance with existing plant procedures, information 
     consistent with that requested in Item 1 b) of the Reporting 
     Requirements for Operating Reactors above for each transmitter 
     identified.

Although not required by this bulletin, addressees are encouraged to report 
information consistent with that requested in Item 1 b) of the Reporting 
Requirement for Operating Reactors through the NPRDS for all Rosemount Model
1151, 1152, 1153 and 1154 transmitters that exhibit symptoms indicative of 
loss of fill-oil or are confirmed to have experienced a loss of fill-oil. 

As has been previously indicated, the NRC staff believes that the 
methodology utilized by Rosemount to support their proposed pressure versus 
time-in-service criteria for identifying which transmitters should be 
subject to an enhanced surveillance program does not provide the necessary 
high degree of confidence that this failure mode will not occur.  Additional 
operational experience data, such as that to be generated in response to 
this bulletin, could be utilized by industry either to provide additional 
insight as to the appropriateness of Rosemount's pressure versus 
time-in-service criteria or to develop bases for staff con-sideration of an 
amendment to or termination of the actions requested by this bulletin.  
Accordingly, the NRC staff encourages utilities to work collectively under 
the guidance of a technical industry organization to develop an operational 
experience database concerning all models of Rosemount transmitters.

The written reports required above shall be addressed to the U.S. Nuclear 
Regulatory Commission, ATTN:  Document Control Desk, Washington, D.C.  
20555, and shall be submitted under oath or affirmation pursuant to the 
provisions of Section 182a, Atomic Energy Act of 1954, as amended and 
10 CFR 50.54(f).  In addition, a copy shall be submitted to the appropriate 
Regional Administrator.

Backfit Discussion

The objective of the actions requested in this bulletin is to ensure that 
transmitter failures due to loss of fill-oil are promptly detected.  Loss of 
fill-oil may result in a transmitter not performing its intended safety 
function.

The actions requested in this bulletin represent new staff positions and 
thus, this request is considered a backfit in accordance with NRC 
procedures.  Because established regulatory requirements exist but were not 
satisfied, this backfit is to bring facilities into compliance with existing 
requirements.  Therefore, a full backfit analysis was not performed.  An 
evaluation of the type discussed in 10 CFR 50.109(a)(6) was performed, 
including a statement of the objectives of and reasons for the actions 
requested and the basis for invoking the compliance exception.  It will be 
made available in the Public Document Room with the minutes of the 179th 
meeting of the Committee to Review Generic Requirements.

This request is covered by Office of Management and Budget Clearance Number 
3150-0011 which expires January 31, 1991.  The estimated average burden 
hours are 6 person-hours per transmitter per licensee.  This includes 
assessing the requested actions, gathering and reviewing plant records, 
analyzing the data 
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obtained from the plant records, and preparing the required response.  This 
does not include developing and implementing the requested enhanced 
surveillance program or replacing transmitters from the manufacturing lots 
that have been identified by Rosemount as having a high failure fraction due 
to loss of fill-oil that are utilized in the reactor protection or 
engineered safety features actuation systems.  Send comments regarding this 
burden estimate or any other aspect of this collection of information, 
including suggestions for reducing this burden, to the Information and 
Records Management Branch, Division of Information Support Services, Office 
of Information Resources Management, U.S. Nuclear Regulatory Commission, 
Washington, D.C.  20555; and to the Paperwork Reduction Project (3150-0011), 
Office of Management and Budget, Washington, D.C.  20503.

If you have any questions about this matter, please contact one of the 
technical contacts listed below or the appropriate NRR project manager.




                              Charles E. Rossi, Director
                              Division of Operational Events Assessment
                              Office of Nuclear Reactor Regulation


Technical Contacts:  Jack Ramsey, NRR
                     (301) 492-1167

                     Vince Thomas, NRR
                     (301) 492-0786

References:

1.  Rosemount Technical Bulletin No. 1 dated May 10, 1989
2.  Rosemount Technical Bulletin No. 2 dated July 12, 1989
3.  Rosemount Technical Bulletin No. 3 dated October 23, 1989
4.  Rosemount Technical Bulletin No. 4 dated December 22, 1989

Attachments:
1.  Typical Physical Characteristics of a Rosemount Transmitter
2.  List of Recently Issued NRC Bulletins
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                                                            Attachment 1
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                                                            Page 1 of 1


         TYPICAL PHYSICAL CHARACTERISTICS OF A ROSEMOUNT TRANSMITTER





               (Figure can not be transmitted electronically)
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