ML070930381
| ML070930381 | |
| Person / Time | |
|---|---|
| Site: | Byron, Comanche Peak  |
| Issue date: | 03/30/2007 |
| From: | Darrell Roberts Rosemount Nuclear Instruments |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 43266 | |
| Download: ML070930381 (5) | |
Text
4' 03/30/2007 U.S. Nuclear Regulatory Commission Operations Center Event Report Pase 1 General Information or Other (PAR)
Event#
43266 Rep Org: ROSEMOUNT NUCLEAR Notification Date / Time: 03/30/2007 10:30 (EST)
Supplier: ROSEMOUNT NUCLEAR Event Date / Time: 01/12/2007 (CDT)
Last Modification: 03/30/2007 Region:
3 Docket M:
City:
CHANHASSEN Agreement State: Yes County:
License #:
State: MN NRC Notified by: DAVID ROBERTS Notifications: JULIO LARA R3 HQ Ops Officer: MARK ABRAMOVITZ JACK WHITTEN R4 Emergency Class: NON EMERGENCY VERN HODGE NRR 10 CFR Section:
OMID TABATABAI NRR 21.21 UNSPECIFIED PARAGRAPH PART 21 - ROSEMOUNT PRESSURE TRANSMITTER MAY NOT BE SEISMICALLY QUALIFIED "During routine operations on the RNII production floor, it was observed that an incorrect torque wrench was being used at mechanical assembly to tighten the Sensor Module Lock Nut. The incorrect tool was calibrated to a value of 12.5 ft-lb, resulting in undertorquing of the lock nut. The incorrect torque wrench was removed from service and replaced with a tool calibrated to the correct torque value of 35 ft-lb. RNII reworked all affected transmitters that had not yet shipped to the correct torque value.
"Assembly with the incorrect tool could result in certain pressure transmitters having a degraded environmental seal between the sensor module and the electronics housing during or after a seismic event."
The five affected models have been delivered to the Byron and Comanche Peak nuclear stations.
I--, --
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ý'rom:EPM ROSEMOUNT NUCLEAR 952 949 5201 03/30/2007 06:25 #479 P.001/004 EMERSON.
Process Management ROSEMOUNT' Nuclear Facsimile Rosemount Nuclear Instruments, Inc.
8200 Market Boulevard Chanhassen, MN 55317 Telephone 1 (952) 949.5234 Fax 1 (952) 949-5201 David,Robert$@EmersonProcess.com To' NRC Operations Center Company:
Fax Number:
(301) 816-5151 Date:
3/30/07 From:
David Roberts, Quality, Manager No. of Pages:
4, Including cover page Rosemount Nuclear Instruments is submitting the attached notification as required by 10 CFR Part
- 21. Please contact me if you have any questions.
Sincerely, David T. Roberts Quality Manager Rosemount Nuclear Instruments, Inc.
From:EPM ROSEMOUNT NUCLEAR 952 949 5201 03/30/2007 06:25 #479 P.002/004 CS Rosemo unt Nuclear Instruments, Inc.
ROSEM OUNTl 8200 Market Boulevard Nuclear Chanhassen, MN 55317 USA Tel 1 (952)949-5210 Fax 1 (952) 949-5201 www.RosernountNue qcorn 30 March, 2007 U.S. Nuclear Regulatory Commission Washington, DC 20555-001 Attn: Document Control Desk Re:
Notification under 10 CFR Part 21 for Certain Model 1154 and 1164 Series H Pressure Transmitters Pursuant to 10 CFR Part 21, section 21.21(b), Rosemount Nuclear Instruments, Inc.
(RNII) is writing to inform you that:
(a) four Model 1154 pressure transmitters shipped to Exelon Generation Co on 22-January-07 (b) one Model 1154 Series H pressure transmitter shipped to TXU Generation Co on 24-January-07 may not meet RNII's published Steam Pressure / Temperature or Post DBE Operation specifications during or after a seismic event.
1.0 Name and address of the individual providing the Information:
Mr. Jeffrey W. Schmitt Vice President & General Manager Rosemount Nuclear Instruments, Inc.
8200 Market Blvd Chanhassen, MN 55317 2.0 Identification of items supplied:
Four Model 1154 pressure transmitters and one 1154 Series H pressure transmitter, as shown below:
Serial Model Number Sales Order Purchase Order Customer I Plant Site Ship Date Number 0533996 1154HPSRAN0037 1793760 00415639 REV 001 Exelon Generation Co 1122/07 Byron Nuclear Station 0533997 1164HP6RANOO37 1793760 00415639 REV 001 Exelon Generation Cot/
1/22/07
__ _x I Byron Nuclear Station 0533998 1 154HP5RAN0037 1793760 00415639 REV 001 Exelon Generation Co /
1/22/07 0
_33998__154HP5RAN_037 1_____3760 0015_3__REV_01 Byron Nuclear Station 0533999 1154HP5RAN0037 1793760 00415639 REV 001 Exelon Generation Co I 1122/07 Byron Nuclear Station 0534017 1154SH9RC 1821300 B0079178078 TXU Generation Cot 1/24/07 I__
_Comanche Peak
/7 3.0 Identification of firm supplying the item:
Rosemount Nuclear Instruments, Inc.
8200 Market Blvd Chanhassen, MN 55317 Page 1 of 3
Yrom:EPM ROSEMOUNT NUCLEAR 952 949 5201 03/30/2007 06:25 #479 P.003/004 4.0 Nature of the failure and potential safety hazard:
During routine operations on the RNII production floor, it was observed that an incorrect torque wrench was being used at mechanical assembly to tighten the Sensor Module Lock Nut.
The incorrect tool was calibrated to a value of 12.5 ft-lb, resulting in undertorquing of the lock nut. The incorrect torque wrench was removed from service and replaced with a tool calibrated to the correct torque value of 35 ft-lb. RNII reworked all affected transmitters that had not yet shipped to the correct torque value.
It has been determined that the torque tool calibrated to 12.5 ft-lb was used on the production line between 12 January 2007 and 26 January 2007, after a 35 ft-lb torque tool was removed from Service for routine calibration. Assembly with the incorrect tool could result in certain pressure transmitters having a degraded environmental seal between the sensor module and the electronics housing during or after a seismic event.
As a result, the specific transmitters noted in section 2.0, which completed mechanical assembly between 12 January 2007 and 26 January 2007, may not meet RNIi's published Steam Pressure / Temperature or Post DBE Operation specifications during or after a seismic event, Random motion and sine motion testing on representative transmitters was performed to evaluate the impact of the undertorqued lock nut. Vibration test limits were established to meet or exceed the 1154 Series H maximum ZPA of 8.5 g to determine if an undertorqued lock nut loosened or the housing rotated during simulation of seismic activity.
Electronics housing rotation was observed.
This rotation could result in a degraded environmental seal between the sensor module and the electronics housing during or after a seismic event.
6.0 The corrective action which has been taken; the name of the Individual or organization responsible for that action; and the length of time taken to complete that action:
(a)
RNII removed the 12.5 ft-lb torque tool from service and replaced it with the correct 35 ft-lb torque tool. In addition, RNII reviewed all other torque tools in use on the production floor to ensure the correct value torque tools were in place.
(Complete: 1/26/2007)
(b)
RNII evaluated all units in production and finished goods. Potentially affected transmitters were reworked. (Complete: 1/31/2007)
(c)
Current field returns were reviewed for impact. None were found. (Complete:
1/31/2007)
(d)
An Internal corrective action request was initiated.
All related activities will be complete as of 4/15/2007.
6.0 Any advice related to the potential failure of the item; The end user is advised to determine the impact of this potential non-conformance on its plant operations and safety and take action as deemed necessary. The Sensor Module Lock Nut can be reworked in accordance with the 'Connecting Electrical Housing to Sensor Module' or 'Connecting Electrical Housing to Module Shroud' instructions found in section five of the product manual.
If it is determined that return of a pressure transmitter is required, RNII should be contacted to facilitate the return process.
Rosemount Nuclear Instruments, Inc. is committed to the nuclear industry and we assure you that we are dedicated to the supply of high quality products and services to ROSEMOUNT' Page 2 of 3 Nuclear
From:EPM ROSEMOUNT NUCLEAR 952 949 5201 03/30/2007 06:25 #479 P.004/004' our customers. If there are any questions, or you require additional information related to this issue, please contact:
Mike Dougherty (208) 865-1112, Gerard Hanson (962) 949-5233, Bob Cleveland (952) 949-5206, or Matt Doyle (952) 949-5204.
Sincerely,
---eL Steve Sonnenberg President Rosemount Nuclear Instruments, Inc.
ROSEMOUNT*
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