ML18030A163

Interim Deficiency Rept Re Loose Contact Modules Found on GE Type CR2940 Selector Switches.Bechtel Will Perform Analysis on CR2940 Switches & Pushbottoms.Final Rept, Including Action Taken,Will Be Submitted in Jan 1981

ML18030A163
Person / Time
Site:	Susquehanna
Issue date:	10/28/1980
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, PLA-565, NUDOCS 8011070407
Download: ML18030A163 (5)

Text

REGULATORINFORMATION OISTRISUTION TEM (RIOS)

ACCESSION NBR:8011070407 DOC ~ DATE ~ 80/10/28 NOTARIZED: NO DOCKET FACIL:50-388 Susquehanna Steam Electric<<Station~ Unit 2g Pennsylva 05000388 AUTH'Ai4lE CURTIS N 5 p ~ ~

AUTHOR AFFILIATION Pennsylvania Power 8 Light Co.

55 3/7 RECIP NAME

~ R'ECIPIENT AFFILIATION GRIERg B,H ~

- Region 1'F Philadelphiaq Office o.f the Director SUBJECT; Interim deficiency rept re loose contact modules found on GE Type CR2940 selector switches.Bechtel will perform

.analysis on CR2940 Switches L pushbottoms,Final rept including action taken<will be submitted in Jan 1981, DISTRIBUTION CODE: B019S COPIES RECEIVED+LTR TITLE: Construction Deficiency Report (10CFR50,55E)

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• TWO NORTH NINTH STREET, ALLENTOWN, PA. 18101 PHONE: (215) 821 5151'ORMAN Vl C' W. CURTIS cCrs I I Vice Presittent-Engineering tL Construction-Nuciear Ctt 821-5381 COC't Alfrt October 28, 1980

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Mr. Boyce H. Grier Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 SUSQUEHANNA STEAM ELECTRIC STATION INTERIM REPORT OF A POTENTIAL REPORTABLE DEFICIENCY GE TYPE CR2940 SWITCHES ERs 100450/100508 FILE 840-4/900-10 PLA-565

Dear Mr. Grier:

This letter serves to confirm information provided by telephone to NRC Inspector Mr. L. Narrow by Mr. A. R. Sabol of PPGL on September 24, 1980.

During that conversation Mr. Narrow was advised that the subject condition was under evaluation for reportabi3.ity under the provisions of 10CFR50.55(e).

Loose contact modules were found on some GE type CR2940 selector switches at other- nuclear power facilitiesr, therefore, a sampling plan was initiated to determine if a similar problem existed at the SSES. Construction was instructed to inspect at least 80 CR2940 selector switches and pushbuttons, both Class 1E and non-Class 1E, on at least 13 different pieces of equipment. Construction was given a listing of 78 pieces of equipment with approximately 750 selector switches and pushbuttons installed on them.

A total of 17 switches and pushbuttons (14 on Unit 2 and 3 on common equip-ment) were identified with loose contact module mounting screws out of 231 switches inspected in 16 pieces of equipment (3 for Unit 1, 4 for Unit 2 and 9 for common equipment).

The switches with loose contact modules are as follows:

Switch Panel Loc. Classification HS-24323B2 2C201A Class 1E II HS-25020B HS-27630A 2C681 HS-27630B HS-27661A HS-27661B HS-27665B HS-27666C IPI 3 PENNSYLVANIA POWER 8 LIGHT COMPANY 80 ILT 0 V 0'/uP gt 0

Mr. Boyce H. Grier October 28, 1980 Switch Panel Loc. Classification HS-27761A

'HS-21131A 2C694 HS-21131B HS-21137A HS-21138A HS-21140B Annun. Test (547) OC673 Non-Class lE Spare (555)

Spare (595)

In letter BLTG-467 dated September 29, 1980, General Electric was requested to furnish the following information:

l. The proper procedure for tightening the screws or nuts holding the certi-loose contact blocks to prevent voiding the product quality fication for Class lE selector switches and pushbuttons, and

2. any special requirements for both Class lE and non-Class lE selector switches and pushbuttons, i.e., torque, use of "locktite", etc.

Via a subsequent telephone call and letter, GE was requested to supply the following information:

1. The reason for the loose contact modules

2. An explanation of what Bechtel QC observed to be insufficiently long mounting screws used to secure the contact modules to the switch frames.

These apparently shorter than adequate screws do not permit the end of the screw to extend beyond the surface of the mounting frame.

It has been concluded that there may be some switches with loose contact modules in safety related circuits and that these contact modules could come loose if not repaired.

Bechtel Construction will check additional CR2940 switches and pushbuttons and an analysis of all the circuits having Class lE switches with loose contact modules will be completed.

Based on the location of such switches in safety related'circuits, Bechtel Project Engineering has concluded that this is potentially reportable under 10CFR50.55(e) .

Further, since the details of this report provide information relevant to the reporting requirements of 10CFR21, this correspondence is considered to also discharge any formal responsibility PPGL may have for reporting in compliance thereto.

Mr. Boyce H. Grier October 28, 1980 We expect to provide a final report on the deficiency and the corrective action taken in January, 1981.

Very truly yours, g2/7c~~~

N. W. Curtis Vice President-Engineering 6 Construction-Nuclear ARS:mcb cc: Mr. Victor Stello (15)

Director-Office of Inspection 6 Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G. McDonald, Director Office of Management Information a 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