ML20046C976
| ML20046C976 | |
| Person / Time | |
|---|---|
| Issue date: | 07/16/1993 |
| From: | Zimmerman R Office of Nuclear Reactor Regulation |
| To: | Sniezek J NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| References | |
| NUDOCS 9308130148 | |
| Download: ML20046C976 (2) | |
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j WASiUNGTON, D. C. 20555 July 16, 1993 MEMORANDUM FOR:
James H. Sniezek Deputy Executive Director for Nuclear Reactor Regulation, Regional Operations and Research FROM:
Roy P.
Zimmerman, Deputy Director Division of Reactor Inspection and Licensee Performance Office of Nuclear Reactor Regulation
SUBJECT:
FINDINGS OF ROSEMOUNT TRANSMITTER REVIEW GROUP - CHARTER ITEM NO. 5
Reference:
Memorandum from J.
Sniezek to R.
Zimmerman, et. al, dated May 21, 1993 The referenced memorandum established a review group to evaluate specific information made available to the NRC related to the Rosemount loss of fill oil issue.
The review group has completed its assessment of one of the items assigned for followup'by the same memorandum.
Provided below is the item reviewed and the group's findings.
"5.
I understand that fossil utilities are proposing to change the design of the Rosemount transmitters because of oil leakage concerns. _ Pursue this matter with Rosemount and EPRI to understand why they are being changed out in fossil facilities but they did not believe it was necessary for nuclear facilities."
The original understanding that fossil facilities are proposing to replace Rosemount transmitters due to oil leakage concerns is incorrect.
There is no broad change out proposed or underway by the fossil facilities.
For background, fossil utility owners have been evaluating the effect of in3trumentation accuracy uncertainty on heat rate (thermal efficiency).
According to the Electric Power Research Institute (EPRI), Pacific Gas & Electric Company (PG&E) recently. conducted a study at the Moss Landing fossil facility to assess the accuracy of certain pressure and.
temperature instrumentation manufactured by Rosemount and Honeywell.
For instrumentation deemed to be measuring vital parameters from'an' economic consideration standpoint, PG&E concluded it was cost effective to calibrate certain instruments every six months, rather than potentially sacrifice thermal efficiency.
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Sniezek 2
In an effort to manage operating and maintenance costs, a number of utility representatives have questioned what they view as the relatively high manpower loading considered necessary to optimize thermal efficiency by maintaining the desired instrument accuracy through frequent calibrations.
In April 1993, EPRI fossil members set aside funds to begin research aimed at improving instrumentation accuracy, such as those sensors measuring pressure and temperature.
A fossil plant task force has been formed to coordinate the efforts, which includes designing and building an advanced pressure transmitter.
The task force is aware of the loss of fill oil concern, and plans to take that information into consideration as it undertakes research toward an advanced design.
Original Signed By:
Roy P.
Zimmerman, Deputy Director Division of Reactor Inspection and Licensee Performance Office of Nuclear Reactor Regulation RISTRIBUTIQH:
JPartlow H.
Scott Review Group Rosemount File PDR DD:DRIL8f9E RZimmerman 7//f/93