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.ersey Centra Power & Ligat Company j
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MADISON AVENUE AT PUNCH BOWL ROAD
- MORRISTOWN, N.J. 07960
- 201-539-0111 Ni.'OkE N 1Nt f 4e[j] Public Utilities Corocration - -
General
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April 26,'1974
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APR291974> r Mr. A. Giambusso E
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'Id Deputy Director for Reactor Projects Eil elf y
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Directorate of Licensing q, /7 United States Atomic Energy Commission 27 g *g Washington, D. C. 20545
Dear Mr. Giambusso:
Subject:
Cyster Creek Station Docket No. 50-2W Abnormal Occurrence Report No. 50-219/74/27 1he purpose of this letter is to forward to ycu the attached Abnonnal Occurrence Report in compliance with paragraph 6.6.2.a of the Technical Specifications.
Enclosed are forty copies of this submittal.
Very truly yours,
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Donald A. Ross Manager, Nuc1 car Generating Stations
. cs Enclosures cc: Mr. J. P. O'Reilly, Director Directorate of Regulatory Operations, Region I n...
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f OYSTER CREEK NUCLEAR CENERATING STATION FORKED RIVER,'NEW JERSEY 08731
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Abnormal Occurrence Report No. 50-219/74/27 t
Report Dato Apr'il 26', 1974 Occurrence Date
' April 17, 1974
. Identification of Occurrence
' Failure of three (3) Bergen-Paterson hydraulic shock and sway arrestors, two (2) located on the main steam line and'one (1) on the feedwater line, in the drywell.
.This event is considered to be an abnormal occurrence reportable within ten days by virtue of personal communications with AEC Region I, Regulatory Operations.
Conditions Prior to Occurrence The plant was shut down with reactor coolant less than 212*F and preparations for refueling operations were in progress.
Description of Occurrence On April 17, 1974, an inspection was' conducted of all Bergen-Paterson hydraulic shock and sway arrestor units installed in the drywell.
As.a result of this inspection, three units, rebuilt in September 1973 with molded polyurethanc seal material, were found inoperabic as determined by the obsence of fluid Icyc1 indication in the accumulators. The inoperable units were as follows:
Serial No.
System Elevation 487530 South Main Steam 23 Fcct l
487512 South Main Steam 51 Feet 587519 South Feedwater 51 Feet
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Apparent Cause of Occurrence None of tho. units have as yet been disassembled and, consequently, the failure mechanism is unknown at this time.
- Analysis of Occurrence LHad 'the desi'gn scismic cvent occurred during power operation, the restraining
- capabilitics of theso units may have-been seriously impared and, consequently, de-
. graded the structural integrity of.the. steam and feedwater lines in. question.
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. Abnormal occurrence No. 50-219/74/27:
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Corrective Action During-the present refueling outage, we plan to replace these units and oth' rs e
in;the primary containment-which still contain molded polyurethane seal materini with units-rebuilt exclusively with ethylene propvlene material.-
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.In our effort to deve20p a long-term solution to this problem,. mechanical snubbers are being evaluated by the Generation Engineering Department as possible:
' replacements for tho' hydraulic snubbers, i'
Failure Data Manufacturer:
Bergen-Paterson Type:
HSSA-10.
Serial Nos.:
487530
-487512
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