JAFP-92-0435, Special Rept:On 920504,CO2 Fire Suppression Sys Declared Inoperable When Walkdown Revealed That 4 Instead of 5 Nozzles Installed in Sys.Caused by Absence of Design Calculations.Replacement Nozzle Installed on 920518

Special Rept:On 920504,CO2 Fire Suppression Sys Declared Inoperable When Walkdown Revealed That 4 Instead of 5 Nozzles Installed in Sys.Caused by Absence of Design Calculations.Replacement Nozzle Installed on 920518

ML20101D243
Person / Time
Site:	FitzPatrick
Issue date:	06/03/1992
From:	Harry Salmon POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
JAFP-92-0435, JAFP-92-435, NUDOCS 9206120077
Download: ML20101D243 (2)

Text

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J:mts A. Fit Patrick Nuclear Power Plant P.O. Box 41 Lycoming New York 13093 315 M2-3840 -

1. > NewYo.rkPower Harry P, Salmon, Jr.

M AUthDIl nesident Manager June 3, 1992 JAFP -9 2- 04 3 5 United States Nuclear Regulatory Commission Document Control Desk Mail Station P1-137 Washington,-D. C. 20555 GUBJECT: DOCKET NO. 50-333, NORTH SWITCHGEAR (EDG) ROOM CO3 SYSTEM INOPERABILITY

Dear Sir:

The New York Power Authority (NYPA) submits the following special report to address the inoperability of the subicct CO2 System for more than 14 days.

This event requires that a 30-day special report be submitted in accordance with_ Technical Specification 3.12.C.2 and 6.9.B.2.

Summarv of Event:

A walkdown of the 002 fire suppression system in the North Switchgear (EDG) Room revealed 1there were 4 discharge nozzles instead of 5 as specified in the original system design documel.tation. All other CO2 systems were verified by walkdown to have the number of nozzles indicated on the design drawings. Design modification documentation could not be found to determine that the system had been changed from the-original design configuration.

Descriotion of the Event and Corrective Action:

During a walkdown of the North Switchgear (EDG) Room, it was-revealed that the fire suppression CO2 system had 4 discharge nozzles rather than the 5 specified in the original design documentation. A search of modification records did not provide documentation that the system had

been properly _ modified._ It also could not be determined that the system ha been tested with 4 nozzles to show that the required design concentration of CO2 could be attained.

Consequently, on May 4, 1992, the system declared inoperable

-at 11:35 AM and a continuous fire watch was established.

'9206120077 920603 PDR ADOCK 05000333 jI [Y'

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1 J. ,

TO: USNRC _ June 3, 1992

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• FROM: H. SALMON. JAFP-92-0435

SUBJECT:

ED9 ROOM SYS OPERABILITY Page 2 A replacement nozzle was obtained and installed on May 18, 1992. This action restored the system to the original design configuration with five (5) nozzles.

This returned the system to operable status approximately 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> past the 14th day.

In addition, due to the absence of design calculations, it was not feasible to evaluate if the system discharge rate could be increased to compensate for the amount of CO2 that the missing nozzle was designed to deliver. The only viable alternative (to reinstate the system to an operable status) was to return the system to tne original design configuration. After receipt of the as-built design.

calculations testing will be performed to verify the design parameters.

Very truly yours,

/' /

'p 2 IIARRY P. FALMON, JA HPS/AA/rfh cc: RMS-JAF RMS-WPO J.-Gray-WPO USNRC Resident. Inspector T. Dicesaro-WPO R.- Klye-WPO J. DeSantis-JAF A. Alford-JAF R. Schimpf-WPO

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