ML19350E488
| ML19350E488 | |
| Person / Time | |
|---|---|
| Site: | Monticello, Dresden, Davis Besse, Palisades, Perry, Fermi, Kewaunee, Point Beach, Byron, Braidwood, Prairie Island, Callaway, Duane Arnold, Clinton, Cook, Quad Cities, La Crosse, Big Rock Point, Zion, Midland, LaSalle, Zimmer, Bailly, Marble Hill  |
| Issue date: | 03/20/1981 |
| From: | Carroll D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Wright G ILLINOIS, STATE OF |
| References | |
| NUDOCS 8106230161 | |
| Download: ML19350E488 (4) | |
Text
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%o, UNITED STATES j
~* 7, NUCLEAR REGULATORY COMMISSION 2
E REGION lli 799 ROOSEVELT ROAD o,
GLEN ELLYN,lLLINOIS 60137
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MAR 20.looi
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Illinois Department of
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G, 'Q(' S 2 *df 837,D Nuclear Safety f6 ATTN:
Mr. Gary N. Wright 1035 Outer Park Drive
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Deputy Director h(,N Springfield, IL 62704 8ts Gentlemen:
The enclosed IE Information Notice No. 81-08 titled " Repetitive Failures of Limitorque Operator SMB-4 Motor-To-Shaft Key" was sent to the licensees listed below on March 20, 1981:
American Electric Power Service Corporation Indiana and Michigan Power Company D. C. Cook 1, 2 (50-315, 50-316)
Cincinnati Gas & Electric Company Zimmer (50-358)
Cleveland Electric Illuminating Company Perry 1, 2 (50-440, 50-441)
Commonwealth Edison Company Braidwood 1, 2 (50-456, 50-457)
Byron 1, 2 (50-454, 50-455)
Dresden 1, 2, 3 (50-10, 50-237, 50-249)
LaSalle 1, 2 (50-373, 50-374)
Quad-Cities 1, 2 (50-254, 50-265)
Zion 1, 2 (50-295, 50-304)
Consumers Power Company Big Rock Point (50-155)
Midland 1, 2 (50-329, 50-330)
Palisades (50-255)
Dairyland Power Cooperative LACBWR (50-409)
Detroit Edison Company Fermi 2 (50-341)
Illinois Power Company Clinton 1, 2 (50-461, 50-462)
Iowa Electric Light & Power Company Duane Arnold (50-331) 810 6 2 :10Ils/
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' Illinois Department'of-
.2-Nuclear Safety b
7, Northern Indiana Public Service Company Bailly (50-367)
L Northern States Power Company Monticello (50-263)
' Prairie-Island 1,'2 (50-282, 50-306)
Public Service of Indiana Marble Hill 1,'2 (50-546, 50-547)
Toledo Edison Company Davis-Besse 1 (50-346) 2 Union Electric Company Callaway.1, 2-(50-483, 50-486)
~ Wisconsin Electric Power Company Point Beach 1, 2 (50-266, 50-301)
Wisconsin Public Service Corporation Kewaunee (50-305)
Sincerely,
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idyY'dr er"#b J
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Uord Processing and Document Control Section
Enclosure:
IE Information Notice No. 81-08 cc w/ encl:
Mr. D. W. Kane,.
Sargent & Lundy Central Files Reproduction Unit NRC 20b AEOD.
Resident Inspectors, RIII J. G. Keppler,- RIII C. E. Norelius,-RIII R. F.-Heishman, RIII J. A.(Hind, RIII-P. R. Wohld, RIII-PDR Local PDR NSIC LTIC t
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t, SSINS No.: 6835 Accession No.:
i 8011040272 IN 81-08 UNITED STATES NUCLEAR REGULATORY COMMISSION 0FFICE OF-INSPECTION AND ENFORCEMENT l-March 20, 1981 IE INFORMATION NOTICE NO 81-08:
REPETITIVE FAILURES OF LIMITORQUE OPERATOR SMB-4 MOTOR-T0-SHAFT KEY
-Description of Circumstances:
l During normal surveillance testing of motor-operated valves at the Cooper
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l Nuclear Station, it was discovered that the RHR "B" loop suppression pool i
cooling inboard. throttle valve would not'. operate.
The valve did not operate
-because the key between the motor pinion gear and the motor shaft had failed.
.The operator for the valve has been identified as being Limitorque model SMB-4.
Analysis of the failed key revealed that a standard type 1010 steel key had been_ installed instead of the required special. type 4140 cteel key.
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'Further review of the problem established that similar failures with motor-to-shaf t keys.had also taken place at the Pilgrim, Hatch, and Fitzpatrick-nuclear power facilities.
Limitorque Company has performed an evaluation of the problem, and they have concluded that the problem is confined to operators having a torque rating in excess of 100 ft/lb.
The standard-type 1010 steel possesses adequate strength to accommodate motor operators having a torque rating that is less than 100 ft/lb.
Recommended Action for Holders of Operating Licenses and Construct b n Permits:
(
It is recommended that licensees having Limitorque Operator SMB-4 installed in their facilities verify that the special type 4140 steel keys have been used.
This can be easily accomplished by performing a hardness check of the motor-to-shaft keys during-the next scheduled surveillance testing.
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No written rbsponse to this information notice is required.
If you need additional information with regard to this subject, please contact the Director of the i
appropriate NRC Regional Office.
Attachment:
Recently issued IE Information Notices
4:
-Attachment IN 81-08 March 20, 1981 RECENTLY ISSUED IE'INFORMATION NOTICES
'Information-Date of
' Notice No.
Subject
-Issue Issued to-81-07J Pot'ential Problem with 3/16/81
'All power reactor Water-Soluble Purge Dam facilities with an_
Materials Used During OL or CP
' Inert Gas Welding 81-06 Failurelof ITE Model 3/11/81 11' power reactor K-600 Circuit Breaker facilities with an OL or CP-81-05 Degraded DC~ System at 3/13/81 All power reactor Palisades facilities with an.
' OL cr CP 81 Cracking in Main Steam 2/27/81 All power. reactor Lines' facilities with an OL
'81-03
. Checklist for Licensees 2/12/81 All power reactor Making Notifications of facilities with an Significant Events in OL Accordance with 10 CFR 50.72 81-02 Transportation of 1/23/81 All Radiography Radiography Devices licensees 81-01 Possible Failures of 1/16/81 All power reactor General Electric Type facilities with an HFA Relays OL or CP.
80-45 Potential Failure of 12/17/80 All PWR facilities BWR Backup ~ Manual Scram with an OL-or CP Capability 80-44 Actuation of ECCS in the 12/16/80 All PWR facilities Recirculation Mode While' with an OL or CP in Hot Shutdown
'OL = Operating Licenses.
CP = Construction Permi.s r