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)

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i Metropolitan Edison Company y

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Q-j Post Office Box 480 Miodletown. Penmvivania 17057 717mmY 948-8005 7

i October 20.)1980 i

RJT f80-410(

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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

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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.

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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.

7RF maximum saf e working pre'sure is 75 psi. The ASCO'model HT 830Cp:h supplies the ASCO solenoid' valves is 85 to 95 psi.

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instrument air wht This overpressuria ttion could affect the solenoid valves' performance, potentially preven ;ing the containment isolatioh valve f rom performing i

as designed.

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These' problems arei considered reportable per Technical Specification j

paragyaph 6.9.2 A, '9).

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i Corrective action a resolve this issue will bei described in the follow up report.

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