ML19276E884
| ML19276E884 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 03/16/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Clayton F ALABAMA POWER CO. |
| References | |
| NUDOCS 7903210565 | |
| Download: ML19276E884 (2) | |
Text
a UNITED STATES f*g" "80&g NUCLEAR REGULATORY COMMISSION o,,
REGION 11
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o MAR 161979
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In Reply Refer To:
RII:JPO 50-348 50-364 Alabama Power Company Attn:
Mr. F. L. Clayton, Jr.
Senior Vice President Post Office Box 2641 Birmingham, Alabama 35291 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 b
Director
Enclosure:
IE Circular No. 79-04 79032105GT Q
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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
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IE Circular No. 79-04 March 16, 1979 LISTING OF IE CIRCULARS ISSUED IN LAST IVELVE M0h7HS Circular Subject Date of Issued To N:.
Issue 78-09 Arcing of General Electric 6/5/78 All Holders of Company Size 2 Contactors cps 78-10 Control of Scaled 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 Holdeie of Valve Lift Rod Bending BWR Ots 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 cps 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 Ch aber Hold Down Bolting OLs or cps for plants with a HPCI Terry Turbine excepting Duane Arnold and Monticello 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-OL March 16, 1979 LISTING OF IE CIRCULARS ISSUED IN LAST TWELVI: MCNTHS Date Issued To Circular Subject of Issue No.
78-01 Loss of Well Logging L/5/78 All Holders of Well Logging Source Gource Licenses 78-02 Proper Lubricating 011 h/20/78 All Holders of Reactor OLs or for Terry Turbines cps 78-03 Fackaging Creater 3han 5/12/78 All Holders of Reactor OLs, cps, Type A Quantities of Low Specific Activity Fuel Cycle, Priority I Material Radioactive Material and Waste Dispostl for Transport Licenses 76-OL Installation Error That 5/15/78 All Holders of Could Frevent Closing of Reactor OLs or cps Fire Doors 78-05 Inadvertent Safety injectic n 5/23/78 All Holders of Reactor OLs or During Cooldown cps 78-06 Potential Co==on Mode 5/23/78 All Holders of Reactor OLs or Flooding of ECCS Equipment cps Boots at BVP Facilities 78-07 Damaged Corponents of a 5/31/78 All Holders of Reactor OLs or Eergen-Paterson Series cps 25000 Hydraulic Test St and 78-08 Environmental Qualification 5/31/78 All Holders sof Reactor OLs or of Safety Related Equipment cps at Nuclear Power Plants Enclosure Pase 1 of 3
March 16, 1979 IE Circular No. 79-Oh Drawing No. 21 L97-0009-3 for instructicns on staking the ' locking nut ;
the specification drawing for the SMB-5 unit has a reference to Li=1 torque Drawing No. 21 h97-0010-3 for staking instructions.
Pennsylvania Power and Light Co=pany (PF&L) inforced the NBC that the generic proble: of failure to stake locking nuts exists with Limitorque PF&L Co. vas advised Type SMC valve operators and Type SM3 operatcrs.
of the proble= by Bechtel Corporation.
The infor=ation was submitted to the NEC on Merch 2, 1979 as a deficiency at the Susquehanns Stea:
Electric Station. The Type SMC Instruction and Maintenance Manual EMCI-OL-78 and Draving No. 21 L97-0013-3 provide directions for securing the locking nut.
All holders of constr : tion permits and operating licenses should be aware that the potential for valve operator failure exists if the locking nut is not adequately secured. The reco== ended action is to survey all ir.ctalled Liritorque Operator Types SM3-000 through SMB-5 end Type SMC to deter =ine that the locking nut is secure and to verify that asse=bly and =aintenance instructions contain directions for securing the locking nut either by staking, per the vendor's recc==endation, or another acceptable canner.
Nc written recycnse to this Circular is required.
If you require additional infor=ation regarding this subject, contact the Director of the appropriate NEC Regional Office.
Enclosure:
List Of IL Cfreulars Issued in the Lart Twelve Months 4
2 of 2
UNITED STATES NUCLEAR REGUIATORY C0!! MISSION OFFICE OF INSPECTION AND ELTORCEMENT WASHINGTON, D.C.
20555 March 16, 1979 IE Circular No. 79-OL LOOSE LOCKING NUT O!! LIMITORQUE VAINE OPERATORS Description of Circu= stances:
On Decenber 8,1978, Fort Calhoun Station Unit No.1' reported that 30 out of 65 Limitorque Type SMB valve operators did not have the locking nut fastened securely in accerdance with the manufacturer's reco==endation.
If this locking nut is not secure it can loosen and allow the ste= nut to move axially to the point that the splines are disengaged; resulting in a loss of drive to the valve stes. The licensee reported that several locking nuts were slightly loose but in no instance had the ste= nut backed out enough to affect the operation of the valve.
This licensee was =ade aware of the potential proble= by a letter of July 28,1978, fro = the NSSS supplier, Co=bustion Engineering, Inc.
Other plants have reported si=ilar findings. On April 27, 1977, Davis-Besse Nuclear Power Station Unit No.1, reported that two valve operability failtres had been caused by locking nuts loosening ar.d falling off.
During the ensuing inspection progra= a total of 65 out of ILL safety rels.ted 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 ANO Unit 2 was =ade by an IE inspector who identified records that 15 out of 17 SMB operators provided by the NSSS supplier (Co=bustion Engineering Inc.) required staking. Valve operability failures, resulting fro = loosened locking nuts, have also been reported by Cooper Nuclear Station (Unusual Event Report 75-5), Browns Ferry Unit 2 report of March 6,197L and Three Mile Island Nuclear Station Unit I reports of March 13, 1976 and October 20, 1976.
The corrective action by the licensee in each case was tc stake the locking nut.
In Jur.e 1978, the Lititerque 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 =anual.
The ste nut specification drawing provided by Limitorque for Unit Types SP-000, SMB-00, SMS-0, SMB-1, SMB-2, SMB-3, and SMB L directs the customer to a Limitorque 1 of 2
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ipVV 7903210002 s
MAR 161979 Alabama Power Company.
cc w/ enc 1:
Mr. W. G. Hairston, III Plant Manager Drawer 470 Ashford, Alabama 36312 Mr. R. E. Hollands, Jr.
QA Supervisor P. O. Box U Ashford, Alabama 36312 Mr. A. R. Barton Executive Vice President Post Office Box 2641 Birmingham, Alabama 35291 Mr. H. O. Thrash, Manager Nuclear Generation Post Office Box 2641 Birmingham, Alabama 35291 Mr. C. B1.idinger, Jr., Manager Corporate Quality Assurance Post Office Box 2641 Birmingham, Alabama 35291
.