ML11284A017
| ML11284A017 | |
| Person / Time | |
|---|---|
| Site: | Clinton, LaSalle  |
| Issue date: | 10/06/2011 |
| From: | Hott G ATC Nuclear |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| 47326 | |
| Download: ML11284A017 (2) | |
Text
10/06/2011 13:32 8656755399 ATC NUCLEAR TN PAGE 01/01 October 6, 2011 NRC Operations Center FAX (301) 816-5151
Subject:
10 CFR PART 21 NOTIFICATION OFD.EFECTIVE MOORE 535 CONTROLLERS Information
Contact:
Ray Chalifoux ATC Nuclear 865 384 0124 This notification is in accordance with U.S. Nuclear Regulatory Regulation 10 CFR. 21.21(a)(3)(ii)(b).
Exelon Corporation Clinton and LaSalle Stations have identified common mode failures associated with Moore 535 Controllers (PartNumber 535-OOOOOOHOST-SSTRV) provided through ATC Nuclear Tennessee. These items were provided as safety related components to Exelon under Clinton Purchase Order 00461980 and LaSalle Purchase Order 00462363. All safety related failures to date appear to originate from these specific purchase orders. The failures have been evaluated with the original equipment manufacturer and appear to be isolated to controllers containing a main processor board containing "Revision F" labeling manufactured in early 2010 (Date Code 1310). These items all passed an extended burn-in during testing. The failures may manifest themselves as process variable (PV) drift, controller reset with loss of controller function, or create nuisance alarm conditions after a relatively short period (<1 year) following installation.
The affected safety related orders as currently known are:
Exelon Clinton Purchase Order 00461980 Moore Serial Numbers
'2136455 2136449 2136458 2136456 2136422 2136451 2136457 2136454 2136453 2136450 2136460 2136459 Exelon LaSalle Purchase Order 00462363 Moore Serial Numbers 2142115 2142116 21421.17 21.46032 2146033 I
Because the end-use application of each item is not known by ATC Nuclear, the safety hazard evaluation has been deferred to the customer. The Licensees above have been formally notified of the defect.
Sincerely, Greg Hott 7
W President, ATC Nuclear 619
1010612011 U.S. Nuclear Regulatory' Commission Operations Center Event Report Part 21 (PAR)
Event#
47326 Rep Org: ATC NUCLEAR Notification Date I Time: 10/06/2011 13:35 (EDT)
Supplier: MOORE CONTROLLERS Event Date / Time: 10/06/2011 (EDT)
Last Modification: 10/06/2011 Region:
1 Docket #:
City:
OAK RIDGE Agreement State:
Yes County:
License #:
State: TN NRC Notified by: GREG HOTT Notifications: MONTE PHILLIPS R3DO HQ Ops Officer: BILL HUFFMAN PART 21 GROUP E-MAIL Emergency Class: NON EMERGENCY 10 CFR Section:
21.21 UNSPECIFIED PARAGRAPH PART 21 NOTIFICATION CONCERNING MOORE PROCESS CONTROLLERS The following information was received from ATC Nuclear via facsimile:
"This notification is in accordance with U.S. Nuclear Regulatory Regulation 10 CFR 21.21(a)(3)(ii)(b).
"Exelon Corporation Clinton and LaSalle Stations have identified common mode failures associated with Moore 535 Controllers (Part Number 535-OOOOOOHOST-SSTRV) provided through ATC Nuclear Tennessee. These items were provided as safety related components to Exelon under Clinton Purchase Order 00461980 and LaSalle Purchase Order 00462363. All safety related failures to date appear to originate from these specific purchase orders. The failures have been evaluated with the original equipment manufacturer and appear to be isolated to controllers containing a main processor board containing "Revision F" labeling manufactured in early 2010 (Date Code 1310). These items all passed an extended burn-in during testing. The failures may manifest themselves as process variable (PV) drift, controller reset with loss of controller function, or create nuisance alarm conditions after a relatively short period (less than 1 year) following installation.
"Because the end-use application of each item is not known by ATC Nuclear, the safety hazard evaluation has been deferred to the customer. The Licensees above have been formally notified of the defect."