ML050450388
| ML050450388 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 02/10/2005 |
| From: | Shaub T Dominion |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| 41397 | |
| Download: ML050450388 (4) | |
Text
IS - onoI U.S. NuclearRegulatory Commission OperationsCenter Event Report Pace I General Information or Other (PAR) Event# 41397 Rep Org: DOMINION Notification Date I Time: 02/10/2005 14:23 (EST)
Supplier: ALLEN-BRADLEY Event Date I Time: 02/10/2005 (EST)
Last Modification: 02/10/2005 Region: 1 Docket #:
City: GLEN ALLEN Agreement State: No County: License #:
State: VA NRC Notified by: TOM SHAUB Notifications: MALCOLM WIDMANN R2 HQ Ops Officer: STEVE SANDIN OMID TABATABAI Nnrr Emergency Class: NON EMERGENCY 10 CFR Section:
21.21 UNSPECIFIED PARAGRAPH PART 21 NOTIFICATION INVOLVING ABNORMAL ALLEN-BRADLEY 700RTC RELAY CONTACT RESPONSE The following information was submitted via fax:
"Reason for Message: Report a Part 21 - Regarding the abnormal response of Alien-Bradley 700RTC relays when configured with the NC contact in the C5-C6 position.
"Event Date: 2/8/05 "Unit Name: North Anna Power Station "Component Information (as applicable):
"Manufacturer Allen-Bradley "Part Number. 700RTC1111OUI "Description: Abnormal contact response was observed during pre-installation testing of Allen-Bradley 700RTC relays. The 700RTC relays are solid state timing relays used in several Safety Related applications at North Anna.
The 700RTC relay provides a wide time adjustment. The relay has two timed contact positions and two instantaneous contact positions. The relays are ordered to a part number that specifies a certain contact arrangement, but the contacts are fully interchangeable and may be configured by the end user in any combination of Normally Open/Normally Closed (NO/NC). Removable contact cartridges mount in the contact slots. At North Anna, Allen-Bradley part number 700RTCII I IOUI is used, which is a contact configuration of NO, NC, NO, NC.
"The relays were setup and tested in a NO, NO, NC, NC configuration when it was discovered that the instantaneous contact (C5-C6 position), with a NC contact cartridge installed, behaved like a timed contact. The C5-C6 position changed state according to the setting of the timer. All other contact positions worked properly.
With a NO contact installed in the C5-C6 position, the contact position behaved as expected (as an instantaneous contact). Different NC contact cartridges were installed in the C5-C6 position of the relay and the anomaly still occurred. Forty-five (45) relays were tested for this anomaly. Twelve of 45 relays failed testing (C5-C6 with NC fif1i
02/10/2005 U.S. Nuclear Regulatory Commission OperationsCenter Event Report Paoe 2 General Information or Other (PAR) Event# 41397 contact behaved like a timed contact). The relays were returned to Allen-Bradley for failure analysis. Allen-Bradley has duplicated the anomaly using the returned relays and one from their stock. The root cause is still under investigation.
"The 700RTC relays are used as replacements for Agastat Relays in certain Safety Related applications. Over the past ten years, several 700RTC relays have been installed in various locations at North Anna. At North Anna, the 700RTC relays are purchased commercial grade then upgraded for safety related use using the commercial grade dedication process. The upgrade is performed by the North Anna Materials Verification Lab using an approved commercial grade dedication plan. Prior to identification of this anomaly, the dedication testing verified proper contact operation of the contact cartridges in the as-received configuration. The dedication process now verifies proper contact operation in all possible contact configurations.
"Current and planned 700RTC relay installations were reviewed. The majority of installed 700RTC relays are configured with the contact cartridges arranged according to the 700RTC 11 I10U1 part number (NO, NC, NO, NC).
In a few locations, the contact cartridges are configured NO, NO, NC, NC. North Anna does not utilize the C5-C6 position with the NC contact cartridge in any of 700RTC locations.
"Prior to installation, 700RTC relays are bench tested for satisfactory operation.
"Causes: The root cause is unknown at this time, although Allen-Bradley has indicated that the sensitivity of the contact cartridges may be a factor in causing this response.
"Corrective Actions: Nine of the relays that failed bench testing were sent back to Allen-Bradley for analysis. North Anna is working with Allen-Bradley to determine a cause.
"Industry Notification: OE notification No. 19273 - Abnormal response of Allen-Bradley 700RTC relays when configured with the NC contact in the C5-C6 position."
FeP 10 2005 14:23 DOM INlIONl 8042733715 p. 1 INNSBROOK 7E4HNICAL CENER
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(TX/RX NO 9151]
Iiooi 14:31 02/10/2005 THU IwIIU 14:31 [TX/R NO 9151] Q001
Feb 10 2005 14:23 DO0M I NIO0N 8042733715 p.2 i
Reasonl for Message: Report a Part 21 - Regarding the abnormal response of Al n-Bradley 700RTC relays when c.n figured with the NC contact in the C5-C6 position.
Event Date: 218105 Unit Name: North Anna Power Station Compohent Information (as applicable):
Manufacturer: Allen-Bradley Part Ndmber: 700RTCI 11 IOUI Descrijition: Abnormal contact response was observed during pin-installation testing, of Allen-Bradley 700RT# relays. The 7D0RTC relays are solid state timing relays used in several afety Related applications at North Anna. The 700RTC relay provides a wide time adjustment. The has two timed contact positions and two instantaneous contact positions. The relays are ordered to a number that specifies a certain contact arrangement, but the contacts are fully interchangeable and may be onfigured by the end user in any Combination of Normally Open/Normally Closed (NO/NC). Removable ntact cartridges mount in the contact slots. At North Anna, Allen-Bradley part number 700RTC11lOUl s used, which is a contact configu ation of NO, NC, NO, NC.
The relays were setup and tested in a NO, NO, NC, NC configuration when was discovered ihat the instantaneous contact (C5-C6 position), with a NC contact cartridge installed, b ved lilke a timed contact.
The C5.C6 position changed state according to the setting of the timer. All other contact positions worked properl . With a NO contact installed in the CS-C6 position, the contact position ebaved as expected (as an instant neous contact).- Different NC contact cartridges were installed in the C5- position of the relay and the.anosnaly still occurred. Forty-five (45) relays were tested for this anomaly. welve of 45 relays failed testing (C5-C6 with NC contact behaved like a timed contact). The relays were ret ed to Allen-Bradley for failure 4nalysis. Allen-Bradley has duplicated the anomaly using the returned relaY and one from their stock.
The rodt cause is still under investigation.
The 70QRTC relays are used as replacements for Agastat Relays in certain Safety I elated applications. Over the pasi ten years, several 700RTC relays have been installed in various locations at North Anna. At North Anna, thie 700RTC relays are purchased commercial grade then upgraded for st fety reliated use using the commexcial grade dedication process. The upgrade is performed by the North A Materials Verification Lab using an approved commercial grade dedication plan. Prior to identifica on of this anomaly, the dedication testing verified proper contact operation of the contact cartridges in the as-received configuration.
The dedication process now verifies proper contact operation in all possible contact configurations.
Current land planned 700RTC relay installations were reviewed. The majority of itstalled 700RTC relays arc configured with the contact cartridges arranged according to the 700RTC111101 1 part number (NO, NC, NO, NUi). In a few locations, the contact cartridges are configured NO, NO, NC, C. North Anna does not utilize 4Le C5-C6 position with the NC contact cartridge in any of 700RTC location Prior tolinstallation, 700RTC relays are bench tested for satisfactory operation.
Causes: The root cause is unknown at this time, although Allen-Bradley has indica' ed that the sensitivity of the cont8ct cartridges may be a factor in causing this response.
Correctmvc Actions: Nine of the relays that failed bench testing were sent back to Al en-Bradley for analysis.
North Anna is working with Allen-Bradley to determine a cause.
Industry Notification: OE notification No. 19273 - Abnormal response of Allen-Br dley 700RTC relays when configured with the NC contact in the C5-C6 position.
02/10/2005 TIIU 14:31 [TX/RX NO 91511 IOj02