ML17311A432
| ML17311A432 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 11/21/1994 |
| From: | Stewart W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 102-03193-WLS-A, 102-3193-WLS-A, IEB-90-001, IEB-90-1, NUDOCS 9412050079 | |
| Download: ML17311A432 (8) | |
Text
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(ACCI'.l.l'.I<ATF.DRll)S I l<OCI:.SSIX REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9412050079 DOC.DATE: 94/11/21 NOTARIZED: NO DOCKET N
FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTH.NAME AUTHOR AFFILIATION F
STEWART,W.L.
Arizona Public Service Co.
(formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk) f-
SUBJECT:
Forwards supplemental response to actions required by NRC Bulletin 90-001,suppl 1 re pressure transmitters mfg Rosemount.
DISTRIBUTION CODE:
IE39D COPIES RECEIVED:LTR ENCL SIZE:
TITLE: NRC Bulletin 90-001, Loss of Fill Oil in Transmitters Mfg NOTES:STANDARDIZED PLANT Standardized plant.
Standardized plant.
by y Rosemoun f-05000528 05000529 I
05000530 RECIPIENT ID CODE/NAME PD4-2 PD TRAN,L INTERNAL.
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1 1
1 1
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N YO'I'E TO ALL RIDS" RECIPIENTS:
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TOTAL NUMBER OF COPIES REQUIRED:
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Arizona Public Service Company
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iiiiOEW:X AaiZOIVA9=-9-2-3999 WILLIAML STEWART EXECUTivE viCEPiiESiOENi NUCiEAii 102-03193-WLS/AKK/DRL, November 21, 1994.
U.S. Nuclear Regulatory Commission ATTN: Document Control Desk
'Mail Station P1-37
'Washington,, DC 20555
References:
1)
NRC Bulletin 90-01, Supplement 1, dated December 22, 1992, Loss of Fill-Oil in Transmitters Manufactured by Rosemount 2)
Letter from W. F. Conway to NRC dated March 12, 1993,
Response
to Actions Requested'by NRC Bulletin 90-01, Supplement 1
Dear Sirs:
Subject:
Palo Verde Nuclear Generating. Station (PVNGS)
Units 1, 2, and 3 Docket: Nos. STN 50-528/529/530 Supplemental Response to Actions Requested by NRC Bulletin 90-01, Supplement 1
File: 94-056-026 The enclosure to this letter contains Arizona Public Service Company's (APS)'upplemental response to the actions required by NRC Bulletin 90-01, Supplement 1,
concerning pressure transmitters manufactured by Rosemount.
Additional corrective actions to.be taken by APS are included in this supplemental response.
Should you have any questions, please contact Angela K. Krainik at (602) 393-5421.
Sincerely, WLS/AKK/DR L/rv Enclosure cc:
L. J. Callan K. E. Perkins B. E.
Holier.004'.
E. Johriht&
9412050079 941121 PDR ADOCK 05000528 0
PDR'
0 I
ENCLOSURE SUPPLEMENTAL RESPONSE TO NRC BULLETIN90-01, SUPPLEMENT
0 41
The NRC issued Supplement 1
to Bulletin 90-01 (Rosemount Transmitters) on December 22, 1992.
APS provided its response to the actions required by the Bulletin in a letter from W. F. Conway to the NRC dated March 12, 1993. The NRC reviewer of APS'esponse requested a
phone conference with APS which occurred on September 22, 1994.
The NRC has questioned the effectiveness of APS'esponse to Action 1.a and item 3 on page 7 of the Supplement without the use of a trending program as described in the Supplement.
Requested Action 1.a reads, in part, as follows:
Expeditiously replace, or monitor for the life of the transmitter on a monthly basis using an enhanced surveillance monitoring program, any transmitters that have a normal operating pressure greater than 1500 psi and that are installed in reactor protection trip systems, ESF actuation systems or ATWS systems.
Action for those transmitters that have not met Rosemount psi-month threshold criterion should be expedited.
At their discretion, licensees may monitor using an enhanced surveillance program at least once every refueling cycle, but not exceeding 24 months, transmitters in this category if the appropriate psi-month threshold criterion recommended by Rosemount has been
- reached, and the monitoring interval is justified based upon transmitter performance in service.
The enhanced surveillance monitoring program is described in item 3 of page 7 as:
As a minimum, enhanced surveillance monitoring programs should provide measurement data with an accuracy range consistent with that needed for comparison with manufacturer drift data criteria for determining degradation caused by a loss of fill-oil. To achieve the desired accuracy, the licensee can determine the trending of zero drift and span drift from the calibration data for most Rosemount transmitter range codes.
Other methods may include measuring the output of a transmitter that is in service using a calibrated instrument and comparing the results with redundant channels.
APS has fourteen transmitters per unit that meet the requirement ofActions 1.a, 1.b, and 1.d.
For those transmitters, APS will perform a trending of the past zero drift and span drift. Once completed, APS will either continue to trend the zero drift and span drift at a maximum interval of twenty-four months as suggested, or will submit an alternate method as provided in NRC Bulletin 90-01, Supplement 1,
Item 3 on page 7.
Additionally, APS has recently decided to exclude from the enhanced surveillance program those transmitters meeting the requirements and authorized under Action 1.e.
0