ML20064C167
| ML20064C167 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 01/31/1994 |
| From: | Richard Anderson NORTHERN STATES POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-90-001, IEB-90-1, NUDOCS 9403090178 | |
| Download: ML20064C167 (2) | |
Text
.
Northem States Power Company 414 Nicollet Mall Minneapolis, Minnesota 55401 1927 Telephone (612) 33455%
January 31, 1994 NRC Bulletin No. 90-01 1
Supplement 1 U S Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
)
PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 l
Additional Information Related to Response to NRC Bulletin No. 90-01, supplement 1 Loss of Fill-oil in Transmitters Manufactured by Rosemount l
On March 1, 1993, we responded to NRC Bulletin No. 90-01, Supplement 1, Loss I
of Fill-oil in Transmitters Manufactured by Rosemount. On October 19, 1993, l
we had a conference call with NRC staff to discuss further information related to our response.
This letter documents the information which we provided during the Jall.
l Issue 1:
In our response to Item 1.b.,
we had stated: "None of the transmitters have shown indication of loss of fill-oil as evidenced by calibration trending and/or quarterly process noise analysis." During the conference call, we were asked which method we used.
We responded that we used both but that the noise analysis was used only as an additional indicator, never the sole means of determination.
Calibration trending was the method relied upon.
Issue 2:
In our response to Items 1.e. and 1.f.,
for the transmitters not requiring an enhanced surveillance program, we had atated that: " Existing administrative controls for Instrument and Control, Operations and Engineering ensure a high degree of confidence in detecting a loss of fill oil problem."
During the conference call, we were asked for examples of these controls.
We discussed several items:
l l
- the training which had been provided to Operations personnel regarding the l
indicators of loss of fill-oil during their monitoring of these instruments, 9403090178 940131 l
POR ADOCK 05000282 O
PDR l) D s.
t
l Nodhem States Power Company US NRC January 31, 1994 Page 2 i
I e the training provided to the Instrument and Control technicians which
(
included a review of the Rosemount technical manual updated with the NRC Bulletin information and class room training on detection of the problem, e the note which is now included in the surveillance procedure SP 2001, Daily Log, which is performed by operations personnel; the note identifies what may be indicative of a failing or failed transmitter and that upon noticing such behavior that it is to be logged for attention by the engineering staff, and e the work instruction procedure provided to the Instrument and Control technicians which elaborates the characteristics to be evaluated for the transmitters and the evaluation criteria for those characteristics; the procedure also requires that the documentation for each calibration of a Rosemount Differential Pressure Transmitter be reviewed by an Instrument
- Engineer, l
We have made no new NRC commitments in this letter.
Please contact Jack Leveille (612-388-1121, Ext. 4662) if you have any j
questions related to this letter.
I
/
,Wp10 LA dA da n RMer O Anderson Director Licensing and Management Issues c: Regional Administrator - Region III, NRC Senior Resident Inspector, NRC NRR Project Manager, NBC J E Silberg i
l l