ML20082E566

Special Rept:On 950326,pump Discharge Relief Valve for Electric Screen Wash/Fire Pump Became Inoperable.Valve Had to Be Secured to Permit Installation of an Isolation Device. Pump Returned to Operational Status After Device Installed

ML20082E566
Person / Time
Site:	Monticello
Issue date:	04/06/1995
From:	Hill W NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9504110262
Download: ML20082E566 (3)

Text

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Northem States Power Company Monticello Nuclear Generating Plant 2807 West Hwy 75 Monticello. Minnesota 55362-9637 April 6,1995 Technical Specification 3.13.B.3.b US Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Special Repori Reauired by Monticello Technical Specification 3.13.B.3 b Montice!!o Technical Specifications, Section 3.13.B, " Fire Suppression Water System,"

specifies limiting conditions for operation for the Monticello fire suppression system. Technical Specification 3.13.B.2 allows one of the three fire protection pumps to be inoperable provided redundant pumps are operable. Technical Specification 3.13.B.3.b states:

"With the fire suppression water systems otherwise inoperable...[p]rovide a special report to the Commission within 14 days outlining the actions taken and the plans and schedule for restoring the system to operable status."

This letter provides the information required by the above specification.

Three fire protection pumps, one diesel driven and two electric driven, are normally available for fire protection system demand. The twn electric driven pumps are each equipped with discharge rcM valves. Both relief valves share a common discharge line without an installed isolation capability.

On March 26,1995, the pump discharge relief valve for the electric screen wash / fire pump (P-104) became inoperable. The screen wash / fire pump was declared inoperable. In the course of removing the relief valve for maintenance on March 28,1995, it was necessary to secure the electric fire pump (P-110) for a short time, approximately 15 minutes, to permit installation -

of an isolation device. The electric fire pump (P-110) was electrically secured to provide personnel protection during this short maintenance evolution. The electric fire pump (P-110) l was retumed to operable status immediately following installation of the isolation device. l Similarly, it was necessary to secure the electric fire pump, in addition to the screen wash / fire pump, when the isolation device was removed and the screen wash / fire pump discharge relief 1 valve was re-installed in the system on March 30,1995. The electric fire pump was retumed to operable status immediately following removal of the isolation device. The screen wash / fire pump was returned to service on March 30,1995.

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NORTHERN STATES POWER COMPANY April 6,1995 Page 2 During these short maintenance periods when two of the three fire protection pumps were inoperable, an operator was stationed near the electric fire pump controller. The operator could have readily taken actions to start the electric fire pump if necessary. The diesel driven fire pump remained available and operable throughout these svolution's.

This letter contains no new NRC commitments, nor does it modify any prior commitments.

Please contact Mary Engen, Sr Licensing Engineer, at (612) 295-1291 if you require further information.

William J ill '

Plant Manager Monticello Nuclear Generating Plant c: Regional Administrator- 111, NRC NRR Project Manager, NRC Sr Resident inspector, NRC State of Minnesota Attn: Kris Sanda J Silberg

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,... [ NORTHERN STATES POWER COMPANY . [

NUCLEAR LICENSING DEPARTMENT

'MONTICELLO NUCLEAR GENERATING PLANT - ,

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Special Report Reauired By Monticello Technical Specification 3.13.B.3.b. l

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. Correspondence Date: April 6,1995 l

.l' Monticello intamal Site Distribution Speaal Instructions Kaleen Hilsenhoff...... USAR File...... ...........Yes No_x_ *

Steve Ludders ..........NRC Commitment .....Yes No_x_ _.

Lila imholte.... ........... Monti OC Sec ...........Yes No_x_ - 11, No dist to OC members below if YES -  ;

. Mel Opstad.... ........... Monti SAC Sec..........Yes_x_ No .- 5 l

• Mail Room ... ........... Monti Posting. ............Yes No_x_ - 7 Monticello Intemal Site Distribution: ,

J C Grubb, NGSS, OC . l

• Monti Document Control File '

W J Hill, Plant MGR, SAC, OC L L Nolan, GSSA, OC C A Schibonski, GSE, OC B D Day, MGR MTC, OC. ,

M F Hammer, GSM, OC Operating Experience Coord

. J E Windschill, GSRS, OC W A Shamla, NQD ,

M W Onnen,- GSO, OC Monti Site Lic File .

Steve Engelke Steve Ray, SR Res Insp, NRC l Joel Beres  ;

NSP Intemal Distribution l E L Watzl - R O Anderson, Dir LMI, SAC .

Mike Wadley, PI T E Amundson, Dir NQD,' SAC ' l Communications Dept Yes No_x_ , i u

i Extemal NSP Distribution g Kris Sanda, State of Minn  !

g~ NE55l'A*3lHIMEM*"j J E Silberg - q

- Both Wetzel, NRR-PM, NRC

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• Advance Distribution made by Site Licensing 1 Manifest Date: April 7,1995 l