ML18030A147

Interim Deficiency Rept Re Defective Limitorque Limit Switch Rotors.Following Engineering Evaluation,Insp Program Will Be Implemented.Defective Rotors Will Be Replaced

ML18030A147
Person / Time
Site:	Susquehanna
Issue date:	09/23/1980
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8010060247
Download: ML18030A147 (4)

Text

REGUL RY INFORMATION DISTRIBUTI SYSTKM (RIDS)

ACCESSIOiV iVBR: 8010060247 DOC ~ DATE; 80/09/23 NOTARIZED: NO DOCKET FACII:50 387 Susquehanna Steam Electric Station~ Uni t 1 i Pennsyl va 05000 50 388 Susquehanna Steam Klectric Station> Unit 2i Pennsyl va 000388 AUTH ~ NAME AUTHOR AFFILIATION CURTIS' ~ W ~ Pennsylvania Power 8 Light Co.

REC IP ~ NAME RECIPIENT AFFILIATION GRIER g B.H ~ Region 1> Philadelphia~ Office of the Director

SUBJECT:

Interim deficiency rept re defective limitorque limit switch rotors.Following engineering evaluationiinso program will be implemented.Defective rotors will be reolaced.

DISTRIBUTION COOK: B019S COPIES RECEIVED:LTR KNCL O SIZE:

TITLE: Construction Deficiency Report (10CFR50 ~ 55E)

NOTES:Send I8K 3 copies FSAR 8 all amends, 05000387 Send I8E 3 copies FSAR 8 all amends, 05000388 REC IP IEVT COPIES RKCIPIKNT COPIES ID CODE/NA'iIE LTTR ENCL ID CODE/NARK LTTR KNCL ACTION: A/D LICENSiVG 04 1 YOUNGBLOODtB 05 1 RUSHBROOKgM ~ 06 STARKgR ~ 07 1 INTERNAL: AD/RCI/IE 17 AEOD 18 ASLBP/J ~ HARD D/DIR HUM FAC15 EDO 8 STAFF 19 EQUIP QUAL BR11 HYD/GEO BR 22 I8K 09 LIC QUAL BR 12 MPA 20 NRC POR 02 OKLD 21 PRO ST RKV 13 QA BR 14 EG Fl 01 RUTHERFORDgd ~ IK STANDRDS DEV 21 EXTERNAL: ACRS 16 16 1 LPDR 03 NSIC 08 1 Qg g 'f4~@

TOTAL iVU!4IBER OF COPIES REQUIRED: LTTR ~ ENCL

TWO NORTH NINTH STREPT, ALLENTOWN, PA. 18101 PHONEME (215) 821 SISI c'~- ~n September 23, 1980 Mr. Boyce H. Grier Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 SUSQUEFAKNA STEAM ELECTRIC STATION INTERIM REPORT OF A DEFICIENCY ON DEFECTIVE LZMZTORQUE LIMIT SWITCH ROTORS ERs 100450/100508 FILE 840-4 PLA-547

Dear Mr. Grier:

This letter serves to confirm information provided by telephone to NRC Region I representative Mr. R. McGaughy by Mr. A. R. Sabol of PPaL on August 21, 1980.

During that conversation, Mr. McGaughy was advised that the subject condition was under evaluation for reportability under the provisions of 10CFR50.55(e).

The deficiency involves limit switches on Limitorcpxe valve operators that control the valve operator and are used to provide position indication.

During preoperational checkout of the Limitorcpxe valve operators, cracks were found in the limit switch rotor, The rotor is made of a phenolic material and is staked to a metal pinion shaft. As the valve operates, the limit switch rotor turns, rotating a moving contact which opens or closes a limit switch contact. The cracks were found in the limit switch rotor where the pinion shaft. The rotor cracks appear to be caused by a misalignment in it is staked to the holes in the limit switch rotor and the pinion shaft.

Since the limit switches are used for the control of the valve operator and foz indication for valve position, a defective limit switch rotor could result in the failure of a valve to operate and/or provide incorrect indication of the valve position. In that these types of failures cculd have an'adverse effect on the safe operation of the nuclear power plant, the defect is considered as reportable under the provisions of 10CFR50.55(e) . A letter was sent to Limitorcpe Corporation which identified the problem and recpested them to determine the cause, scope and corrective action for the limit switch rotor problem.

Bechtel NCR 6020 and PPK NCR 80-134 have been written to document known rotor defects in the Core Spray and Reactor .Recirculation systems. Upon engineering evaluation of the data that Limitoraue provides, an inspection program will be developed and implemented for the conduct of field inspections of the limit switch rotors. All defective rotors will,be replaced.

3o/7 PENNSYLVANIA POWER IL LI G H T COMPANY

~~10060'/2

Mr. Boyce H. Grier ~ 2 Sept. ember 23, 1980 Since the details of this report provide information relevant to the reporting recuiremen- of 10CFR21, this correspondence is considered to also discharge any formal responsibility PPGL may have for reporting in compliance thereto.

We expect to issue a final report in November, 1980.

Very truly yours, N. W. Curtis Vice P"esident-Engineering G Construction-Nuclear ARS:mcb cc: Mr. Victor Stello (15)

Director-Office of Enspection 6 Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G. McDonald, Director Office of Management Information 6 Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. Robert M. Gallo U. S. Nuclear Regulatory Commission P. O. Box 52 Shickshinny, Pennsylvania 18655