ML19276E883
| ML19276E883 | |
| Person / Time | |
|---|---|
| Site: | Atlantic Nuclear Power Plant  |
| Issue date: | 03/16/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Zechella A OFFSHORE POWER SYSTEMS (SUBS. OF WESTINGHOUSE ELECTRI |
| References | |
| NUDOCS 7903210563 | |
| Download: ML19276E883 (1) | |
Text
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UNITED ST ATES tka m:00 NUCLEAR REGULATORY COMMISSION
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v MAR 161979 In Reply Refer To:
RII:JP0 50-437 Of f shore Power Systems Attn:
Mr. A. P. Zechella, President 8000 Arlington Expressway P. O. Box 8000 Jacksonville, Florida 32211 Gentlemen:
The enclosed IE Circular 79-04 is forwarded to you for information.
If there are any questions related to your understanding of the suggested actions, please contact this office.'
James P. O'Reilly
- J-Director
Enclosure:
IE Circular No. 79-04 79032105 0 k
IE Circular No. 79-04 March 16, 1979 LISTING OF IE CIRCULARS ISSUED IN LAST 'IVELVE M0hTHS Circular Subject Date of Issued To No.
Issue 78-16 Limitorque Valve 7/26/78 All Holders of Actuators Reactor OLs or cps 7-17 Inadequate Guard Training /
10/13/78 All Holders of Qualification and Falsified and applicants Training Records for Reactor OLs.
7-18 UL Fire Test 11/6/78 All Holders of Reactor OLs or cps 78-19 Manual Override (Bypass) 12/28/78 All Holders of of Safety Actuation Signals cps 79-01 Administration of 1/12/79 All Medical Unauthorized Byproduct Licensees except Material to Humans Teletherapy Medical Licensees and each Radiopharmaceutical Suppliers 79-02 Failure of 120 Volt Vital 2/16/79 All Holders of AC Power Supplies Reactor OLs and cps 79-03 Inadequate Guard Training-2/23/79 All Holders of Qualification and Falsified and applicants Training Records for Special Nuclear Material Licenses in Safeguards Group I Enclosure Page 3 of 3
IE Circular No. 79-04 March 16, 1979 LISTING OF IE CIRCULARS ISSUED IN LAST TWELVE MONTHS Circular Subject Date of Issued To No.
Issue 78-09 Arcing of General Electric 6/5/78 All Holders of Company Size 2 Contactors cps 78-10 Control of Sealed 6/14/78 All Medical Sources Used in Licensees in Radiation Therapy Categories G and G1 78-11 Recirculation M-G 6/15/78 All Holders of Set Overspeed Stops BWR OLs or cps 78-12 HPCI Turbine Control 6/30/78 All Holders of Valve Lift Rod Bending BWR OLs or cps for plants with HPCI Terry Turbine 78-13 Inoperability of Multiple 7/10/78 All Holders of Service Water Pumps Reactor OLs and (Ps except for plants located in: AL, AK, CA, FL, GA, LA, MS, SC 78-14 HPCI Turbine Reversing 7/12/78 All Holders of BWR Chamber Hold Down Bolting ole or cps for plants with a HPCI Terry Turbine excepting Duane Arnold and Manticello 78-15 Checkvalves Fail to 7/20/78 All Holders of Close In Vertical Reactor OLs or cps Position Enclosure Page 2 of 3
IE Circular No. 79-Oh March 16, 1979 LISTING OF IE CIRCULARS ISSUED IN LAST TWELVE MONTHS Circular Subject Date Issued To No.
of Issue 78-01 Loss of Well Logging h/5/78 All Holders of Source Well Logging Source Licenses 78-02 Proper Lubricating Oil h/20/78 All Holders of for Terry Turbines Reactor OLs or cps 78-03 Fackaging Greater Than 5/12/78 All Holders of Type A Quantities of Reactor OLs, cps, Low Specific Activity Fuel Cycle, Radioactive Material Priority I Material for Transport and Waste Disposal Licenses 76-04 Installation Error 'Ihat 5/15/78 All Holders of Could Prevent Clcsing of Reactor OLs or Fire Doors cps 78-05 Inadvertent Safety Injecticn 5/23/78 All Holders of During Cooldown Eeactor OLs cr cps 78-06 Potential Co==on Mode 5/23/78 All Holders of Flooding of ECCS Equipment Reactor OLs or Roor:.s at BWP Facilities cps 78-07 Damaged Corponents of a 5/31/78
.11 Holderr of
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Bergen-Paterson Series Reactor OLs or 25000 Hydraulic Tect cps Stand 78-08 Environmental Qualification 5/31/78 All Holders of of Safety Related Equipment Reactor OLs or at Nuclear Power Plants cps Enclosure Page 1 of 3
IE Circular No. 79-Oh March 16, 1979 Drawing No. 21-h97-0009-3 for instructions on staking the locking nut ;
the specification drawing for the SM3-5 unit has a reference to Limitorque Drawing No. 21 h97-0010-3 for staking instructions.
Pennsylvania Power and Light Company (PF&L) informed the NBC that the generic problem of failure to stake locking nuts exists with Limitorque Type ?'4C valve cperators and Type SM3 operaters.
FF&L Co. was advised of the problem by Eechtel Corporation. The information was submitted to the FRC cn March 2, 1979 as a deficiency at the Susquehanna Steat Electric Station. The Type SMC Instruction and Maintenance Manual SMCI-Oh-78 and Drawing No. 21 h97-0013-3 provide directions for securing the locking nut.
All holders of construction permits and operating licenses should be aware that the potential for valve operator failure exists if the locking nut is not adequately secured.
The recornended action is to survey all inctal'- d Limitorque Operator Types SMB-000 through SM3-5 and Type SMC to determine that the locking nut is secure and to verify that assenbly and maintenance instructions contain directions for securing the locking nut either by staking, per the vendor's reconnendation, or another acceptable canner.
Nc written recronse to this Circular is required.
If you require additional inforration regarding this subject, contact the Director of the appropriate NRC Regional Office.
Enclosure:
List Of IL Circulars Issued in the Last Twelve Menths 2 of 2
UNITED STATES NUCLEAR REGULATORY CC! MISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 March 16, 1979 IE Circular No. 79-Oh LOOSE LOCKING NUT CN LIMITORQUE VALVE OPERATORS Description of Circunstances:
On Dece=ber 8, 1978, Fort Calhoun Station Unit No. I reported that 30 out of 65 Limitorque Type SMB valve operators did not have the locking nut fastened securely in accordance with the manufacturer's reco==endation.
If this locking nut is not secure it can loosen and allow the stem nut to rove axially to the point that the splines are disengaged; resulting in a loss of drive to the valve stem. The licensee reported that several locking nuts were slightly loose but in no instance had the stem nut backed out enough to affect the operation of the valve.
This licensee was made aware of the potential problem by a letter of July 28,1978, from the NSES supplier, Combustion Engineering, Inc.
Other plants have reported similar findings.
On April 27, 1977, Davis-Besse Nuclear Power Station Unit No. 1, reported that two valve operability failures had been caused by locking nuts loosening end falling off.
During the ensuing inspection program a total of 65 out of
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1k4 safety related valve operators required staking. Arkansas Nuclear One (ANO), Unit 2, reported on June 29, 1978, that several valve operators required staking. A subsequent inspection at AND Unit 2 was made by an IE inspector who identified records that 15 out of 17 SMB operators provided by the,NSSS supplier (Combustion Engineering Inc.) required s t aking. Valve operability failures, resulting from loosened locking nuts, have also been reported by Cooper Nuclear Station (Unusual Evcnt Report 75-5), Browns Ferry Unit 2 report of March 6,197h and Three Mile Island Nuclear Station Unit 1 reports of March 13, 1976 and October 20, 1976.
The corrective action by the licensee in each case was to stake the locking nut.
In June 1978, the Limitcrque Corporation issued a supplement to the October 1977 issue of the Type SMB Instruction and Maintenance Manual SMBI-170 that called for the crimping or staking of the locking nuts.
The 1971 issue of the manual had statements for crimping and staking of the lock nuts incorporated into the manual. The stem nut specification drawing provided by Limitorque for Unit Types SMP-000, SMB-00, SMB-0, 3MB-1, SM3-2, SMB-3, and SMB L directs the custorer to a Limitorque 1 of 2 MP6 7903210002
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