ML19257C602

LER 79-115/03X-1:on 791221,during Normal Operation,Personnel Noted Low Flow Alarms Associated W/Stack Gas Radiation Monitor Sys.Caused by Plugged Sample Line Common to Both Sample Pumps & Monitors.Sample Line Cleared W/Nitrogen

ML19257C602
Person / Time
Site:	FitzPatrick
Issue date:	01/23/1980
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
ML19257C599	List: ML19257C598 ML19257C602
References
LER-79-115-03X, LER-79-115-3X, NUDOCS 8001290479
Download: ML19257C602 (2)

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POWER AUTHORITY OF THE STATE OF NEW YORK J AMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACHMENT TO LER 79-IIS/03X-1 Page 1 of I During normal opera t ion, personnel noted low flow alarms associated with the stack gas radiation monitor system. Investigation revealed that the portion of the' sample line which is common to both sample pumps and monitors was appar-ently plugged thus continuous monitoring of the stack gas radiation levels, as requi red by Technical Speci fications Appendix A, Paragraph 3.2.D.3 and App 6ndix B, Paragraph 2.3.B.9, was not possible. By design, a single sample pump suction line and sample probe is provided and no other alternate sampling method, utilizing portable equipment,is practical.

Check out of the heat tracing associated with the sample line did not indicate any failure and since the ambient temperature condition was approximately 35 F, freeze up of the sample line is not considered to be a possible cause of the plugging. Further, no other cause for the apparent plugging could be found. The sample line was blown down with nitrogen and this action restored normal operation of the monitoring system in less than three (3) hours af ter the low flow alarms we re ini tially received.

Review of the stack gas release rates, both before and after the event, show that the release rate was less than 50 microcuries per second. Similarly, review of the steam jet ai r ejector -diation monitor datc indicates that the release rate from the plant stack during the short time in which monitoring was not avail-able would have remained essentially constant therefore the event did not represent a significant hazard to the public health and safety, NOTE: Revision 1 of this LER is submitted to correct the indicated time for which the system was out of service, to clarify that redundant instrumentation was not available and to provide additional information which supports the conclusion that the plant stack release rate remained essentially constant at normal levels during the time period when the monitoring system was not available.

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