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November 2, 1972
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Director, Directorate of Licensing USAEC Washington, D.C.
20545 1
J Unusual occurrenec UO-72-6 Docket IN=her 50-293 License DPR-35, Araendacnt No..-.1 Ino; erability of Air Sarpling System (Panel C-19) i In accordance with Pilgria Nuc1ccr Power Statica Technical Specificctions 6,6.C.1, va hereby report on an out of sci' rice conditica of the prf acry system boundary I
coolant leckage air sanpling system which occurred on September 24, 1972 and again on Septcaber 29, 1972 Technical YpTcifEnlion 3.6.C.2 requires both the cump and air sampling systems to be opernble during recctor pouer operntien ex-cept that one systent cr.ny be out of service for a maxi =um of seven days for corrective maintenance.
Su utary of Occurrance During the pericd of Septerfacr 24 to Septcuber 27, l';72, the primary system bcun-dary coolant Icakare air campling system van inoperchic because of moisture in the detection equip = cat. A si..tilar condition was experienced for.. period of 9i hours on Septenbcr 29, 1972 The alteracte cooiaat leakage dcccction system (dry.ecil eculpnant and floor sump system) wcs opernbic dering his period and the primary coolant lonhage averaged less than 5 spa identified Icakage and less than one gpa unidentified Icakcnc. The reactor uns opercting up to 50 percent of rated powar during this period.
Investication and Correct'_ve Action P
j Investigation revealed thcc noisture was accacalating in the detcetion equip.cnt l
because the sample air cooled below its deu point ca the air traveled through the saapic line into the detector. Tac drywall c.abient is ncruelly greater than 120 F while the sc;1ple line and detection equip.r.ar.t located cutside of the dry-i well is at a temyrature of about 70 ?.
The re.?ultian noisture then co'.lected 0
e on the particutate filter paper which, in time, blochd the secepic air ficv.
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At the present time the problem is being controlled by periodically changing the pcrticulate filter paper. A more perunent solution to the problem has i
beca designed by the responsible design engineer and will.b6 imple=cated when l
the materials are available. Tha modificction vill prevent moisture from accumulating on the particulate filter paper.
t Respectfully submitted, 5
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Courtesy Copy to:
P. I. Rock Superintendent Directorate of Regulatory Operations Stean Operations Department j
Region I Division of Compliance USAEC i
970 Broad Street Newark, New Joiscy 8606300168 860613 b
i PDR FOIA BURNSTEIB6-58 PDR O "3 ' '
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