ML20101E832

Special Rept:On 960314,two of Three Fire Pumps Removed from Svc for Planned Mod Work.Returned Both Fire Pumps to Svc Same Day

ML20101E832
Person / Time
Site:	Monticello
Issue date:	03/15/1996
From:	Hill W NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9603250235
Download: ML20101E832 (2)

Text

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l Northem States Power Company l

Monticello Nuclear Generating Plant ,

i 2807 West Hwy 75 '

Monticello, Minnesota 55362-9637 i

i March 15,1996 Technical Specification 3.13.B.3.b US Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 l

MONTICELLO NUCLEAR GENERATING PLANT i Docket No. 50-263 License No. DPR-22 l Special Report Reauired by Monticello Technical Specification 3.13.B.3.b Monticello 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.

On March 14,1996 at 0532 hours0.00616 days <br />0.148 hours <br />8.796296e-4 weeks <br />2.02426e-4 months <br />, two of the three fire pumps were removed from service for planned modification work. This planned action was necessary to install injection connections with isolation valves in the fire line piping just downstream of the pump (s) discharge valves.

The isolation for these valves required the common header from the two fire pumps to be isolated resulting in the inoperability of the two fire pumps. The injection connections with isolation valves will be used in the future to inject biocide and dispersant to control the growth of Microbiologicalinfluenced Corrosion (MIC).

Both fire pumps were retumed to service at 1802 hours0.0209 days <br />0.501 hours <br />0.00298 weeks <br />6.85661e-4 months <br /> the same day (March 14,1996).

During the period of time for which the two fire protection pumps were inoperable, the following compensatory actions were taken:

Performance of work requiring the use of ignition sources (e.g., welding, flame cutting, j brazing, or soldering) was not allowed in the pertinent affected structures.

l l Contingency plans were in place to terminate the maintenance and restore the fire suppression system in an expeditious manner, if required.

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USNRC NORTHERN STATES POWER COMPANY March 15,1996 Page 2 3

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

Please contact Sam Shirey, Sr Licensing Engineer, at (612) 295-1449 if you require further information.

f)/!/kbx 4 W J Hill 2

Plant Manager i Monticello Nuclear Generating Plant

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Regional Administrator-lil, NRC NRR Project Manager, NRC Sr Resident inspector, NRC State of Minnesota Aun: Kns Sanda J Silberg 4 l 4

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