ML20042H044

Ro:On 900412,fire Protection Sys 2 Multiplexer Trouble Alarm Received in Control Room & Would Not Clear,Resulting in Inoperability of Sys for More than 14 Days.Hourly Fire Patrol Established & Power Supply for Multiplexer Replaced

ML20042H044
Person / Time
Site:	FitzPatrick
Issue date:	05/11/1990
From:	Fernandez W POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
JAFP-90-0408, JAFP-90-408, NUDOCS 9005170111
Download: ML20042H044 (2)

Text

James A.Pitspatr6ek

O' '

• Nuolest Power Plant 6 P.O. Box 41 1 Lycoming, New York 13093

, 315 M2 3HO j I

WrkPbwer  ;

William Femander 11  ;

0,3II Residerit Manager May 11, 1990 JAFP-90-0408 e

i United States Nuclear Regulatory Commission Document Control Desk i Mail Station P1-137 Washington, D.C. 20555

SUBJECT:

DOCKET NO. 50-333, FIRE SYSTEM MULTIPLEXER l INOPERABILITY

Dear Sir:

The New York Power Authority (NYPA) submits the following special 7 report to address inoperability of a fire system multiplexer for more than 14 days.

The event requires that a 30-day special report be submitted in ,

accordance with Technical Specifications 3.12.E.2 and 6.9.B.2.  ;

l I Summary of Event

! A Fire System Multiplexer, 76MPX-2, was out of service for 24 I days due to a ground on the circuit. Loss of this multiplexer a

caused various smoke and heat detectors, required to be operable in accordance with Technical Specifications 3.12.E.1, to be inoperable.

Descriotion of the Event and Corrective Action  ;

On April 12, 1990 the Fire Protection System #2 multiplexer troublo alarm was received in the Control Room and would.not ,

clear. The multiplexer was declared inoperable and a hourly Fire Patrol-established for the areas monitored by this circuit.  !

j A work request was assigned to the Instrument and Control (I&C) i Department to trouble shoot and repair within 7 days. On April 13, 1990 I & C had completed replacement of a power supply to

76MPX-2 and the trouble alarm cleared for a short period of time.

When the trouble alarm returned a ground on the circuit supplying ,

power to_76MPX-2_was noticed. -j

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TCf: USNRC- May 11, 1990 i FROM: WILLIAM'FERNANDEZ- JAFP-9CH0408 '

i '

SUBJECT:

SPECIAL. REPORT TO ADDRESS FIRE SYSTEM Page ~2-MULTIPLEXER INOPERABILITY FOR MORE THAN '

14 DAYS The I&c Department transferred the work request to the Electrical-Department to troubleshoot and repair the ground. The plant-is  ?

-in a refueling outage and the Maintenance Departments are working I two shifts. The work request was transferred to the night shift

' Electrical Supervisor. During this transfer the priority of working 76MPX-2 was not communicated to the Electrical Department, j On May 2, 1990 the Electrical Department determined.the ground on 76MPX-2 was caused by installation of a plant. modification which added a second Diesel Fire Pump and associated annunciators.' The: ,

annunciator circuits were tied-together which resulted in a i ground on 76MPX-2.

On May 4, 1990 a Temporary Modification was approved and-installed which separated the two circuits. Additionally,La request was submitted to install a permanent modification.to-resolve this identified problem.

On May 6, 1990, 24 days after:76MPX-2 was declared 5 inoperable, the multiplexer was yo.curned to service and the hourly fire 5 -patrols wero-secured. "

In addition to the actions taken as described above, Operations-  !

L Department has been reminded of the'need to closely track Fire "

l System maintenance items and to-ensure the; proper level of l priority is assigned to returning fire system components-to service.

• l Very tr ly;yours, 1 1

l WILLIAM FER NDEZ WF:RAL:dm

.q

CC: NRC Resident Inspector 4 1, NRC Region I i y J. A. Gray, WPO ,

i A. Heath "

V. Childs Document control' Center WPO Records Management

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