ML20090H268

Ro:On 840705,motor Starter Timer in Cleanup Sys Air Blower Failed During Electrical Storm.Timer Believed Struck by Lightning.Replacement Timer Installed & Reactor Returned to Power on 840709

ML20090H268
Person / Time
Site:	Rhode Island Atomic Energy Commission
Issue date:	07/09/1984
From:	Dimeglio A RHODE ISLAND, STATE OF
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
P-384-424-120, NUDOCS 8407260196
Download: ML20090H268 (1)

Text

Certification No. P 384-424-120 TATE OF RI! ODE ISLAND AND PROVIDENCE PLANTATIONS RHODE ISLAND ATOMIC ENERGY COMMISSION Nuclear Science Center South Ferry Road Narragansett, R.I. 02882-1197 July 9, 1984 U. S. Nuclear Regulatory Commission Region 1 Office of Inspection and Enforcement

'931 Park Avenue King of Prussia, PA 19406 Licenso R-95 Docket 50-193 m~

'2, *3Centiemen:

q .a, c -This letter will confirm a telephone report made to Jerry Roth on July 5, 1984 concerning the-failure of a motor starter component in the "cleon" air blower which is part of the building clean-up system. This blower is re, quired for operation of the reactor.

Y ,.

s. . .

C, Th'is blower controller consists of a reduced voltage starter incorporating a {'t'.imer. The timer failed preventing the application of full voltage to the motor causing it to operate at reduced speed. When we discovered the a failure, the' reactor was shut down.

e, .

The failure occurred during an electrical' storm. We believe that the

[_

C circuit containing the timer was hit by lightning since other non-related

' devices on the circuit were also " burned out". In addition, observers from another building saw. lightning hit the reactor facility twice. We are confident that a lightning strike was the cause because.of damage in a computer terminsi, a computer printer and a telephone, none of which is

~

involved in reactor operations.

A replacement timer was obtained and installed on July 6, 1984. The blower then operated normally. The reactor. returned to power on July 9, 1984, the

~next aormal day of operation.

There were no consequences at the facility.

y truly yours,

~

A. Francit'DiMeglio Director AFD:cd 8407260196'G'40709 PDR ADOCK 05000193 S PDR I O e, is a