05000387/LER-1984-001, :on 840103,hydrogen Dioxide Analyzers in Containment Atmosphere Monitoring Sys Inoperable.Caused by Design Deficiency.Catalyst Will Be Replaced on 840201 for Unit 1 & on 840215 for Unit 2

:on 840103,hydrogen Dioxide Analyzers in Containment Atmosphere Monitoring Sys Inoperable.Caused by Design Deficiency.Catalyst Will Be Replaced on 840201 for Unit 1 & on 840215 for Unit 2

ML20080C031
Person / Time
Site:	Susquehanna
Issue date:	02/02/1984
From:	Keiser H, Wilks B PENNSYLVANIA POWER & LIGHT CO.
To:	NRC
References
LER-84-001, LER-84-1, PLA-2067, NUDOCS 8402070364
Download: ML20080C031 (3)

LER-1984-001, on 840103,hydrogen Dioxide Analyzers in Containment Atmosphere Monitoring Sys Inoperable.Caused by Design Deficiency.Catalyst Will Be Replaced on 840201 for Unit 1 & on 840215 for Unit 2

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(vi)
3871984001R00 - NRC Website

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1. '3I APPROVED OMS No 3150-4104 LICENSEE EVENT REPORT (LER)

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22 EVENT DATE (S)

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> o ei 23 Analyzers in the Containment Atmosphere Monitoring System were declared The H 0 inopera5le due to errors made in assumptions during the design of the catalyst that resulted in it not being able to withstand iodine concentrations that would exist in the reactor containment of a 3000 megawatt reactor under the worst conditions during a Loss Of Coolant Accident (LOCA).

Subsequently, the company that produced the catalyst has developed a modified catalyst capable of operating in the H /0 analyzers under the worst conditions. ReplacementofthecatalystintheUn$t$

H /02 Containment Atmosphere Monitoring Systemanalyzers is scheduled for February 1, 2

1984, prior to startup, and by February 15, 1984 for Unit 2.

Unit 1 was shut down for the tie-in outage within Unit 2 when the modification to the analyzers was identified and performed. There were no adverse consequences to the public health and safety.

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According to the vendor for the H /02 Analyzer Catalyst, Comsips, Inc., errors were 2

made in assumptions regarding iodine concentrations that would exist in the reactor containment of a 3000 megawatt reactor under worst case conditions during a Loss Of Coolant Accident (LOCA). As a result, the design of the standard (original) catalyst would produce hydrogen readings lower than those that would actually exist in containment at that time.

Subsequently, Comsip, Inc., has developed a modified catalyst capable of operating in the H 0 analyzers under the worst conditions. The modified catalyst have been 22 purchased from Consip for replacement of those currently used in both the Unit 1 and Unit 2 Containment Atmosphere Monitoring System. Replacement of the catalyst in the Unit 1 H /0,, Containment Atmosphere Monitoring System analyzers is scheduled for February 1,21984, prior to startup, and by February 15, 1984 for Unit 2.

Had a LOCA occurred while the standard catalyst was in use, not only would the useable life time of the system been reduced, but the degradation of the catalyst would result in the analyzer indicating progressively less hydrogen than actually exist in containment. Since the hydrogen recombiners are manually initiated by the operator when the hydrogen concentration reaches 3.0 percent, a lower than actual indication of hydrogen could result in an increase in the concentration of hydrogen before action could be taken.

Unit 1 was shut down for the tie-in outage with Unit 2 when the modification to the analyzers was identified and performed. There were no adverse consequences to the public health and safety.

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Pannsylvania Powcr & Light Company Two North Ninth Street

• Allentown, PA 18101

• 215/770 5151 February 2,1984 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 SUSQUEHANNA STEAM ELECTRIC STATION LICENSEE EVENT REPORT 84-001-00 ER 100450 FILE 841-23 Docket No.

50-387 PLA-2067 License No.

NPF-14 Attached is Licensee Event Report No. 84-001-00 for Susquehanna Unit 1.

This event was determined to be reportable per 10 GR, Parts 50.72(b)(2)(iii) and 50.73(a)(2)(vi), in that it was learned that the catalyst in the H /02 2

analyzer for the Containment Atmosphere Monitoring System was not likely to resist iodine poisoning for a Loss Of Coolant Accident (LOCA). The H /02 2

catalysts have been replaced with a modified catalyst capable of withstanding iodine poisoning. Unit 1 vas shut down for the tie-in outage with Unit 2, when the modification to the analyzers was identified and performed. There were no adverse consequences to the public health and safety.

b H.W. Keiser Superintendent of Plant-Susquehanna BLW/cg cc:

Dr. Thomas E. Murley Regional Administrator, Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Mr. R.H. Jacobs Senior Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 52 Shickshinny, PA 18655 SGP ih l