ML20062J428

RO 80-410:determined That Replacement Coils Being Installed in Response to IE Bulletin 79-01A Have a Range Lower than Station Battery Voltage Range.Coils Could Potentially Fail If Maintained at Voltages Above Normal Operating Range

ML20062J428
Person / Time
Site:	Three Mile Island
Issue date:	10/20/1980
From:	Toole R METROPOLITAN EDISON CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
80-410, IEB-79-01A, IEB-79-1A, NUDOCS 8010240489
Download: ML20062J428 (2)

Text

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! Metropolitan Edison Company l j [k  ! {... - Q- j Post Office Box 480

• Miodletown. Penmvivania 17057 717mmY 948-8005 7

i October 20.)1980 i ,. RJT f80-410( i 8 ie  !

Mr. Noyce H. Grie:: i Director l Office of Inspect in & Enforcement .

Region 1 g l

Nuclear Regulatory Commission 631 Park Avenue l King.of Prussia, E L 19406 l i

1 Subj ect: LICENSE 3 EVENT REPORT NO. 80-18 ,! ,

i . l Dear Mr. Grier-1 1 *

' Re: Operating Licensee DPR-50

; Dockat'50-289

-l This,ltalecop5r is t i confirm the conversacion between Mr. D. R. Haverkamp,  !

Region 1 NRC, and. L. S. Harbin, Technical Analyst, and P. Levine, Elec-trical Engineer, T II-1 at 1615 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.145075e-4 months <br /> on October! 17, 1980.

I i It has been detern Lned that thereplacementcoiksbeinginstalledin response to IE Bul) Letin 79-01A are rated at 120! V DC with a normal opera. ting range of 102 to 126 volts. The statilan batrcry voltage l

ranges frca 107 cci 137 volts. The coils could potentially f ail if they were mai.ntaia'ni at voltages above their not=al operating range. ,

4 ASCO.polenoid Valv ts (model HT 830037RF) are used on 11 outside con-tainannt isol'ation volves which une ASCO solenoids for pilot cperators.

ASCO'model HT 830C 7RF maximum saf e working pre'sure e is 75 psi. The  ;

l instrument air whtp:h supplies the ASCO solenoid' valves is 85 to 95 psi.

This overpressuria ttion could affect the solenoid valves' performance, potentially preven ;ing the containment isolatioh valve f rom performing i as designed.

II l These' problems arei considered reportable per Technical Specification j

paragyaph 6.9.2 A, '9) . ,

l t! i Corrective action a resolve this issue will bei described in the I follow up report. 4 I '

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