ML20033F757
| ML20033F757 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 03/26/1990 |
| From: | Parker T NORTHERN STATES POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9004030010 | |
| Download: ML20033F757 (2) | |
Text
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Northem States Power Company
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' 414 Nicollet Mall l
'l Minneapohs. Minnesota 554011927 Telephone (612) 3345500 March 26, 1990 Tech. Spec. 3.14.B.3 9
Director of Nuclear Reactor Regulation-
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U S Nuclear Regulatory Commission
' Attn:
Document Control Desk Washington, DC 20555 6
PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR 42 50-306 DPR-60 9
Special Report Plans for Alternate Fire Suppression System Redundancy This special report is being submitted in_accordance with Prairie Island Technical Specification 3.14.B.3.
Technical Specification 3.14.B.3 requires that:
"With the FIRE SUPPRESSION WATER SYSTEM otherwise inoperable:
a.
Establish a backup FIRE SUPPRESSION WATER SYSTEM within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, and b.
Provide a special report to the Commission within 30 days outlining the actions taken and the plans and schedule for restoring the inoperable system to OPERABLE status."
On Wednesday, December 20, 1989 the Prairie Island plant staff took 121 screenwash pump, 121 motor driven fire pump, and 122 diesel driven fire pump out of service to do normal maintenance on a number of leaking fire protection valves.
These pumps were out of service from 1:45 AM to 9:52 PM, for a total-of 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br />.
Prior to taking these pumps out of service and during the time they were out of service two 4" crossover valves from the plant cooling water header were open to supply pressure to the fire header.. In addition, six other 3" and 4" cooling water crossover valves were available for use if they had been required.
During this time the cooling water header pressure maintained 112 psi with both 11 and 12 cooling water pumps running.
The three backup cooling water pumps were also available.
9004030010 900326 PDR ADOCK 05000282 S
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L e apologize for the lack'of timeliness in filing this report..Due to W
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Please contact us if you require additional information.
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Thomas M-Parker Manager--
Nuclear. Support Services c: Regional Administrator - Region III, NRC Senior Resident Inspector, NRC NRR Project Manager, NRC 4
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