BVY-92-105, Special Rept:On 920810,electric Fire Pump Portion of Vital Fire Suppression Water Sys Equipment Inoperable for 17 Days. Caused by Need to Perform Preventive maint.Diesel-driven Fire Pump Remained Operable & Contingency Plans Developed

Special Rept:On 920810,electric Fire Pump Portion of Vital Fire Suppression Water Sys Equipment Inoperable for 17 Days. Caused by Need to Perform Preventive maint.Diesel-driven Fire Pump Remained Operable & Contingency Plans Developed

ML20105A704
Person / Time
Site:	Vermont Yankee
Issue date:	09/11/1992
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
BVY-92-105, NUDOCS 9209170188
Download: ML20105A704 (2)

Text

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f I MERMONT YANKEE LNUCLEAR' POWER CORPORATION

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p Fe ry Road Brattleboro, VT 05301-7002 e

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ENGINEER lNG UFFICE t,k ' t,33 m in sma r

_ 00LTON MA 01140

/ M.06 779 0711 September 11,1992 J I

BVY 9210F l

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United States Nuclear Regulatory Commission )

ATTN: Document Control Desk i Washington, D.C. 20555 i~

Reference:

a) Operating License DPR 28 (Docket No. 50-271)

Subject:

,eport of inoperable Equipment in the Vital Fire Suppresslor) Water Systern

. In accordance with Vermont Yankee Technical Specifications Section 3.13.B.2, this report is submitted as notification that the _ electric fire pump portion of de Vital Fire Suppression Water system equipment, was made inoperable for seventeen days for preventative molntenance activities.

The electric fire pump was removed from cervice on Monday, August 10,1992 and was returned to service oa Wedne. day, August 26,19?1 The scope of the work undertaken included disassembly, inspection, refurbishing, and restoration to service. These activities did not reveal any condition which could have immedit tely affected the operability of the pump prior to the performance of thJ work.-

l Duririg the period when the electric fire pump was inoperable, alternate provisions were made to supply the Vital Fire Suporession Water system. These provisions are detailed in Attachroent A.

If you have any questions or require addit;caal information conceming our efforts, please do n'ot hesitate to contact us.

, Very truly yours, Vermont Yankee Nuclear Power Corpcration W

arren P. M phy

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j Senior Vice residea:. Opet ion i cc: ~ USNRC Region I Administrator

' USNRC Realdent inspector, VYNPS

- USNRC Project Manager, VYNPS g c : .- s 1 -

92091e>1BB60D;K 920*r11 05000271 i

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L PDR S PDR f

e ATTAOHMENT A Provisions for Vital Fire Suppression Water System Based on the results of preventive maintenance performed on the four s+ation service water pumps and the diesel driven fire pump, maintenance personnel recommended that the electric driven fire pump undergo similar preventive maintenance measures. To ensure that the preventive maintenance work was completod in an expeditious manner, the following actions were taken;

1) Appropriate procedures, manuals, and repair documents were identified and made available prior to the preventive maintenance activity.

2) Repair personnel were dedicated to the fire pump maintenance activities.

, 3) Support equipment required for the removal and installation of the fire pump l was scheduled and reserved for the project.

4) Anticipated replacement parts were identified, located, and verified as evallable.

5) Contingency plans were developed to ensure a successful repair effort.

Tech Spec Section 3.13.B.1 specifies the minimum equipment requirements tc<

an operable Vital Flie Suppression Water System. Section 3.13.B.1.a requires that two fire pumps cre operable and lined up to the fire suppression loop. Since the electric driven fire pump preventive maintenance work placed this one pump out of service, the following compensatory measures were established:

1) The diesel driven fire pump remained operable as the primary Vital Fire Suppression Water supply pump.

2) The plant service water system, which can be cross connected to the fire water main, was utilized as the secondary source for the Vital Fire Suppression Water system.

3) The service water system was verified as operable prior to the start of work on the electric fire pump and remained operable during the work effort.

-These actions provided assurance that _an adequate Vital Fire Suppression Water System was maintained, that an independent water source was available at all times and that the preventive maintenance activities associated with the electric driven fire pump would not significantly impact tha operability of the Vital Fire Suppression Water system.

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