ML20064F984
| ML20064F984 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 03/08/1994 |
| From: | Rhodes F WOLF CREEK NUCLEAR OPERATING CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| ET-94-0023, ET-94-23, IEB-90-001, IEB-90-1, NUDOCS 9403150520 | |
| Download: ML20064F984 (3) | |
Text
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W@ NUCLEAR OPERATING LFCREEK forrest T. Rhodes Vic,e FW.*nt Engsrumong March 8, 1994 ET 94-0023 U.
S.
Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station PI-137 Washington, D.
C.
20555
Reference:
Letter ET 93-0029, dated March 4, 1993, from F. T.
Rhodes, WCNOC to the NRC Document Control Desk
Subject:
Docket No. 50-482:
Response to Request for Additional Information Concerning NRC Bulletin 90-01, Supplement 1 Gentlemen:
The attachment to this letter provides additional information concerning Wolf Creek Nuclear Operating Corporation's (WCNOC) original response to NRC j
Bulletin 90-01, Supplement 1,
"Less of Fill Oil in Transmitters Manufactured by Rosemount."
This information was requested by Mr.
W.
D.
Reckley, NRC Project Manager, on February 3,
1994 during a teleconference with WCNOC personnel. The reference provided WCNOC's original response to the bulletin.
If you have any questions concerning this matter, please contact me at (316) 364-8831, extensicn 4002, or Mr. Kevin J. Moles at extension 4565.
Very truly yours, d
!M p,/ J f &
Forrest T. Rhodes d O. bli FTR /j ra cc:
L.
J.
Callan (NRC), w/a G.
A.
Pick (NRC), w/a W.
D.
Reckley (NRC), w/a L.
A.
Yandell (NRC), w/a l
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Po son 411/ Burhngton, Ks sca39 / rnone (316) 364-8831 h
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Attachment to ET 94-0023 Page 1 of 2 Response To Request For Additional Information Reetues t +
Describe how Wolf Creek Nuclear Operating Corporation's (WCNOC) enhanced surveillance monitoring program incorporates information presented in Rosemount Technical Bulletin No. 4 and how information collected during the performance of surveillance procedures is trended.
}le s non s e.1 Currently, WCNOC utilizes a computer trending program that has incorporated all of the applicable data collected from the performances of surveillance procedures for Rosemount transmitters since plant operations began in 1985.
This program is used to mathematically derive trending data based on the callected surveillance data.
Accumulated span and zero drift versus time are charted along with the drift limits specifieel in Rosemount Technical Bulletin No.
4, Table 1A,
" Maximum Allowable Cumulative Drift."
The trending data is teviewed periodically for abnormalities, sustained drift
- symptoms, or exceeding drift limits. Any Fuspect transmitter is then evaluated for further action.
Further action may consist of time response data review, a zero to upper range limit time response test, replacement, or a delay of action until additional trending data is available.
JiC2 Z lLL1 Deccribe the current status of the 12 high pressure
(>
1500 psi) transmitters installed in the Reactor Protection System (RPS) and the four safety-related high pressure transmitters not installed in the RPS.
Also, describe the trending program for these transmitters.
Jir onon sql The :2 high pressure transmitters installed in the RPS are mature pursuant to the Rosemount pai-month threshold. Calibration information from the collected surveillance data has been assembled for these transmitters.
This data has been collected since either the start of initial plant operation or the transmitter installation date and initial calibration. At the time of WCNOC's initial response to Bulletin 90-01, Supplement 1,
there were four safety-related high pressure transmitters not installed in the RPS.
Two out of toe four transmitters have subsequently been replaced. One transmitter was replaced with a replacement manufactured after July 11, 1989, and is outside the atea of concern.
The other transmitter was replaced with a warehouse replacement and is currently being trended quarterly by a comparison with redundant channels.
The other two transmitters are mature and are trended using the same method as the high pressure RPS transmitters which is described above.
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' Attachment to ET 94-0023
- Page 2 of 2 Mil t tona l Information:
During a recent investigation of the documentation and program review / revision process associated with the replacement of existing instrumentation with a different manufacturer and/or model, a review was conducted of Barton transmittern eligible for replacement with Rosemount transmitters.
During this review it was discovered that a Barton transmitter had been replaced on July 31, 1991, with a Rosemount Model 1153HP6 transmitter; however, it was not placed in the enhanced nurvelllance monitoring program in accordance with the requirements of Bulletin 90-01, Supplement 1.
In response to this finding the transmitter, which is clannified as a high pressure transmitter not installed e
in the RPS, has been added to the Rosemount Loss of Fill Program.
Calibration data from July 31, 1991, to present has been entered in the computer trending program and has been reviewed for excessive / consistent drift that is representative of the loss of fill condition.
Also, a quarterly calibration preventive maintenance activity has been established for this transmitter to ensure that the quarterly trending requirements are roet.
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