05000333/LER-1980-017-03, /03L-0:on 800130,drywell-to-torus Differential Pressure Did Not Meet 1.7 Psi Requirements of Tech Specs for Approx 1-h.Caused by Rapid Temp Decrease in Drywell Cooling Sys.Nitrogen Added,Restoring Pressure to Normal

/03L-0:on 800130,drywell-to-torus Differential Pressure Did Not Meet 1.7 Psi Requirements of Tech Specs for Approx 1-h.Caused by Rapid Temp Decrease in Drywell Cooling Sys.Nitrogen Added,Restoring Pressure to Normal

ML19294B469
Person / Time
Site:	FitzPatrick
Issue date:	02/25/1980
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19294B468	List: 05000333/LER-1980-017, Forwards LER 80-017/03L-0 05000333/LER-1980-017-03, /03L-0:on 800130,drywell-to-torus Differential Pressure Did Not Meet 1.7 Psi Requirements of Tech Specs for Approx 1-h.Caused by Rapid Temp Decrease in Drywell Cooling Sys.Nitrogen Added,Restoring Pressure to Normal
References
LER-80-017-03L, LER-80-17-3L, NUDOCS 8002280446
Download: ML19294B469 (2)

LER-1980-017, /03L-0:on 800130,drywell-to-torus Differential Pressure Did Not Meet 1.7 Psi Requirements of Tech Specs for Approx 1-h.Caused by Rapid Temp Decrease in Drywell Cooling Sys.Nitrogen Added,Restoring Pressure to Normal

Event date:
Report date:
3331980017R03 - NRC Website

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POWER AUTif0RITY OF Ti!E STATL OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACIBfENT TO LER 80- 017/03 L- 0 Page 1 of I During normal operation, the Drywell to Torus Differential Pressure was less than the requirements of Technical Specifications paragraph 3.7. A.7.

This resulted in operation in a degraded mode allowed by paragraph 3.7. A.7.a.3 for a period of less than one (1) hour.

The differential pressure was out of specification approximately 0.05 psid due to a rapid drop in the reactor building cooling system temperature. A trip of the reactor water cicanup system resulted in a sudden decrease in the heat load on the reactor building cooling system which in turn resulted in a rapid decrease in the temperature of the reactor building cooling system. This temperature decrease resulted in a drywell pressure decrease (due to cooling).

Addition of nitrogen to the drywell via the makeup system restored the differential pressure to within technical specification limits in less than one (1) hour. The event did not represent a significant hazard to the public health and safety.

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