ML18030A166

Interim Deficiency Rept Re Excessive Voltage Drops in 250- Volt Dc Power Cables Supplying Motor Operated Valves.Caused by Power Cable Lengths & Line Resistances.Alternatives Being Evaluated.Final Rept Will Be Submitted by Jan 1981

ML18030A166
Person / Time
Site:	Susquehanna
Issue date:	11/17/1980
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-570, NUDOCS 8011210591
Download: ML18030A166 (3)

Text

REGULA TO, I*VFORMAT I ON OISTRISUT IO'l EM (RIDS)

ACCESSION VSR:8011210591 DOC ~ DATE: 80/ll/17 NOTARIZED: NO DOCKET ¹ FACIL:50 387 Susquenanna Steam Electric Station~ Unit 1E Pennsylva BYNAME 50 388 Susquehanna Steam Electric Stations Unit 2i Pennsylva 05000388 AUTH A JTEiOR AFFII.IATION CURT IS E'A ~ '8 ~ Pennsy vani a Power 8 Li ght 1

Co,'EC IP ~ NAME RECIPIEur AFFILIATION GRIERE 8 ~ H, Region 1E Philadelphia< Office of the Oirectof

SUBJECT:

Interim deficiency reot re excessive voltage drops in 250 YDC oower caoles supplying motor operated valves'aused by power cable lengths 8 line resistances, Alternatives being evaluated. Final reot will be submitted by Jan 1981.

DISTRISUTIOR CODE: SOIRS COPIES RECEIVED:CTR 1 ESCL 0 SIZE:

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

NOTKSsSend Send IRE' 18E 3 cooi es copies-FSAR 8 FSAR 4 al all l

amends'5000387 amends ~

05000388 RECIPIEV T COPIES RECIPIENT COPIES ID CODE/VA'lE L~TTR ENCL ID CODE/l4AHK LTTR ENCL ACTION: A/D LICEIVSNG 04 YOUNGBLOODgB 05 RUSHBROOKPR ~ 06 STARKERS 07 I I4TERiVAL: AD/RC I/I ASLBP/J.HARD E 17 AEOD D/OIR 18 HUM FAC15 1

1 EDO L STaFF 19 EQUIP QUALT SR11 1 HYD/GEO BR 22 18E 09 1 LIC QUAL. BR 12 MPA 20 1 1 l4RC PDR 02 OELD 21 1 PRO REY 13 QA BR 10 1 1 G FIL 01 RUTHERFORDt 0 ~ IE 1 STANDRDS DEY 21 EXTERNAL: ACRS 16 16 1 LPDR 03

~

NSIC 08 1 V >< ~BSO TOTAL NUMBER OF COPIES REQUIRED'Tl'R 39 ENCL

TWO NORTH NINTH STREET, ALLENTOWN, PA~ 18101 PHONEr {2IS) 821-SISI ICQRr.rAN 'O'. CURTIS Vce Presicenr-Engrneering 8 Consiruction.Nuclear 821 8881

~

November 17, 1980 Mr. Boyce H. Grier Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania, 19406 SUSQJEKLNNA STEAM ELECTRIC STATION INTEE~ REPORT OF A. DEFICIENCY RESULTING FROM.

EXCESSIVE VOLTAGE DROPS IN POWER SUPPLIES TO DC MOTOR OPERATED VALVES ERs 100450/100508 PILE 840-4/900-10 PLA-570

Dear Mr. Grier:

This letter serves to confirm information provided by telephone to NRC Region I Inspector Mr. J. Mattia by Mr. A. R. Sabol of PP&L on October 15, 1980.

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

The'deficiency involves excessive voltage drops in 250 VDC power cables supply-ing motor operated valves. The voltage drops are due to power cable lengths and the attendant line resistances that are so excessive as to prevent the motors fzom starting..

PP&L Engineering has pezformed calculations for all 250 VDC motor operated valves which draw more than 10 amps inzush current and has determined that the excessive voltage drops would affect a significant number of these motor operated valves.

The motor operated valves in question are located in. the Reactor Water Cleanup, Residual Heat. Removal, Reactor Core Isolation Cooling; and High Pressure Coolant Injection systems. Since the valves in these systems are required to operate to mitigate a design basis event, the aforementioned failure to.

operate is considered to represent a reportable deficiency. under 10CPR50.55(e).

PP&L Nonconformance Report (NCR) 880-335 and Bechtel NCR 06668 have been written to document and control the condition and provide. for resolution and corrective action.

Since the details of this report provide information relevant to the reporting requirements of 10CFR21, this correspondence is considered to also discharge formal responsibility PP&L may have for reporting in'ompliance thereto. 'ny port PENNSYLVANIA POWER 8, LIGHl COPAPANY

-Sy~ 28/

o~g )

>Ir. Boyce H. Grier November 17,'980 PP&L Engineering is in the p ocess of evaluating several alternatives in order to determine the optimum course of action. We estimate that a final report will be available in January, 1981.

Very truly yours>

N. W. Curtis Vice President-Engineering & Construction-Nuclear ARSsmcb cc: Mr. Victor Stello . (15)

DirectorOffice of: Xnspection. & Enforcement ~

U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Office of Management Information & 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