ML18030A250

Interim Deficiency Rept Re GE Hfa Relays Which Have Coils Wound on Lexan Spools,Initially Reported on 810206.Cause Not Yet Specifically Determined.Addl Info by June 1981

ML18030A250
Person / Time
Site:	Susquehanna
Issue date:	04/03/1981
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-708, NUDOCS 8104100435
Download: ML18030A250 (4)

Text

t REGULATORY INFORMATION DISTRIBUTION SYSTF'4 t (RIOS)

ACCESSION NBR;810~looa35 OOC,DATE; 81/OO/03 NOTARIZED: NO DOCKET ¹ FACIL:50-387 Susquehanna Steam Electric Station~ Unit li Pennsylva 05 BYNAME 50-388 Susquehanna Stean Flectric Station< Unit 2~ Pennsylva 03 AUTH AUTHOR AFF ILlATION CURTIS' ~ 4 ~ Pennsylvania Power 8 Light Co ~

REC IP ~ NAME RECIPIENT AFFILIATION GRIERg 8 ~ H ~ Region li Philadelphia~ Of fice of the Director

SUBJECT:

Interim deficiency rept re GE HFA r clays which have coils wound on Lexan spools~initially repor ted on 810206,Cause not yet specifically determined,Addi info by June 1981.

DISTRIBUTION CODE: 8019S COPIES RECEIVED:LTR ~ ENCL SIZE:

TITLE: Construction Oe ti ci ency Report (10CFR50 ~ 55E)

NOTES:Send ILE 3 copies FSHR il all amends. 05000387 Send I8,E 3 copies FSAR L all amends, 05000388 RECIPIENT COPIES RECIPIENT COPIES IO CODE/NAME LTTR ENCL IO CODE/NAME LTTR ENCL ACTION: A/5 LICENSNG OQ YOUNGBLOOOgB 05 RUSHBROOK iM ~ Oe STARKgR ~ 07 INTERNAL: ASLBP/J ~ HARD 5/DIR HUM FAC15 EDO 8 STAFF 19 EQUIP QUAL BR11 HYO/GEO BR 2? IRE 09 LIC QUAL BR 12 MPA 20 NRC PDR 0?. OELD 21 'A PRO 7S-T EV 13 BR 14 G F ILE 01 RUTHERFORDH ~ IE T>4 S OEV 21 EXTERNAL: ACRS le 16 1 LPDR 03 NSIC 08 1 AIBA g'~'OTAL NUNBF" OF COPIES REQU1REO: LTTR 37 ENCL 37

TWO NORTH NINTH STREET, ALLEN'TOWN, PA. 18101 PHONEr t215) 770-5151 NORMAN W. CURTIS Vice president-Engineering rL Construction-Nuclear 770 5381 April 3, 1981

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I Mr. Boyce H. Grier Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 SUSQUEHANNA STEAM ELECTRIC STATION INTERIM REPORT OF A DEFICIENCY RELATING TO GE HFA RELAYS ER's 100450/100508 FILES 840-4/821-10 PLA-708

Dear Mr. Grier:

This letter serves to provide the Commission with an interim report of a deficiency involving General Electric HFA relays. The deficiency was originally reported by telephone to NRC Region I Representative, Mr. R. T. Carlson, by Mr. A. R. Sabol of PPaL on February 6, 1981. During that conversationr Mr. Carlson was advised that the condition was being evaluated for reportability under the provisions of 10 CFR 50.55(e).

The deficiency involves GE HFA relays which have coils wound on Lexan spools.

These Lexan spools are susceptible to cracking. The problem was the subject of NRC Information Notice 181-01.

The condition has been identified by PPGL on NCR 181-083 for Unit 1 and by Bechtel on NCR 57138 for Unit 2. The condition has since been determined to be reportable under the provisions of 10 CFR 50.55(e) and this report is submitted pursuant thereto.

GE has conducted an inspection of HFA relays in Unit 2 panels under their scope of supply. The inspection was performed in accordance with GE FDI MDEP.

The inspection resulted in discovery of 16 broken and 65 cracked coils out of the 358 checked.

5

'Sr o4 x00 PENNSYLVANIA POWER 6 LI G H T COMPANY j 0 q~+

Mr. Boyce H. Grier 2 April 3, 1981 The cause of the deficiency has not yet been specifically determined. PPGL has requested GE to evaluate the cause of this deficiency and whether the cracking is affected by vibration, age or relay utilization (normally energized or deenergized) and if hydrocarbons may have an influence on the problem.

In analyzing the safety implications of the coil spool breakage, the results of the GE inspection conducted under FDX MDEP were evaluated. PP&L has concluded that these relays are used in .safety applications such as the Reactor protection, High pressure Coolant Injection and Nuclear Steam Supply Shutdown Systems. The failure of one of these relays is considered a significant construction deficiency that could prevent a system from performing its intended safety function.

PPGL has since directed 100% inspections of the remaining GE HFA relays outside the scope of the original GE inspection. All relays with cracked or broken coil spools discovered in Class IE systems will be replaced. Xn non-class IE systems, only the coils with cracked or broken spools will be replaced. The need for alternative or additional corrective action will be evaluated upon receipt of information regarding cause determination and GE aging test results.

Since replacement relays will not be available until July, 1981, we expect to complete our inspection program for Unit 1 shortly thereafter. The inspection and replacement process for both units will be controlled through appropriate instructions and quality checks.

Since the details of this report provide information relevant to the reporting requirements of 10 CFR 21, this correspondence is considered to also discharge any formal responsibility pPaL may have in compliance thereto.

We expect to provide additional information on this deficiency in June, 1981.

We trust the Commission will find this report to be acceptable.

Very truly yours, N. W. Curtis Vice President-Engineering 6 Construction-Nuclear FLW:sab

Mr. Boyce H. Grier April 3, 1981 cco Mr. Victor Stello (15)

Director-Office of inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G; McDonald, Director (1)

Office of Management Information & Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. Gary Rhoads U. S. Nuclear Regulatory Commission P.O. Box 52 Shickshinny, PA 18655