IR 05000245/1973001
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Jersey Central Power & Light Co.
Docket tio. 50-219 -
Attention Mr. T. J. McCluskey Station Superintendent-Oyster Creek Nuclear. Station l
Forked River, New Jersey 08731 f
. Gentlemen:
A RO Inquiry Report dated January 11,.1973 regarding the Millstone Point Company's lii11 stone Point 1 plant was recently placed in the Public Document Room. The subject matter discussed in that report is felt to have possible applicability to your plant and, accordingly, I have
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r enclosed a copy for your information.
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Sincerely, t
Robert T. Carlson, Chiof
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i Facility Operations Branch
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Enclosure:
R0 Inquiry Report No. 50-245/73-01Q
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.,9604170079 960213 PDR FOIA DEKOK95-250 PDR omer>...fMS.S.
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Carlson:keb
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Fore AEC-$le (Rev.9-53) AECM 0240
' l le dff 17 C 0 7 $
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UNITED ST ATES ;
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ATOMIC ENERGY COMMISSION
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.. DIRECTOR ATE OF MEGULATORY OPEM ATIONS REoioH 1
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' NEWARK, NEW JCRSEY 07102
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RO Inquirv Report No.- 50-245/73-01Q.
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Millstone PSint Company LLicensec:
. P. O. Box 270
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- I Hartford, Connecticut 06101
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.DPR-21.
. License yo.:
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' Facility; Millstone Point 1:
l Waterford, Connecticut
'l Equipment Failure Control Rod
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Drive Accumulators
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Prepared by: /d / M ', / W 84 rf3 '
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- Date
~. L. CaphtoT, ' Senior Reactor Inspector D
A.
Date and Manner 'AEC was Infomed:
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On January 8,1973 the inspector telephoned the site regarding other matters and the licensee's representative informed the inspector.
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about this condition. An RO inspector reached the sit'e on the same-day and provided additional information.
A RO metallurgist was brought in and inspected this matter on January 9,1973, along
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with the initial RO inspector.
B.
Description of Particular Event or Circunstance:
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~ Control rod drive system hydraulic accumulators were previously found
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i to be leaking water past the piston into the nitro;cn section of the accumulator. An inspection of the accumulators was conducted.
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Upon disassc=bly of the leaking accumulators, it was found that some
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plating on the inside diameter surfaces of the accumulator cylinder
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was coming of f.
In addition, it was found that blister type bul;;es
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j had formed principally in the area of the cylinder wall (approximately 7 to 8 inches) from the accumulator botto at uhich location the
piston is nomally positioned during nomal operation of the control o
rod, drives.,
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2-The accumulator cylinder was stated to be SA106 carbon steel plated with nickel and chrome on top. The piston was stated to be 6061
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anodized aluminum having three
"0" ring " Slide A Seals".
The largest surface defect was stated to cover an area of 8" x 6".
The largest flaking off of the chromo plating was described as being sbnilar in size to a half dollar.
Most of the blisters
or pits were characterized as being the size of a pin head or smaller and covering less than a total of 1/2 of 17, of the cylinder area and appeared primarily in the vicinity of the piston.
The flaking of the chrome plating was stated by the GE representa-
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tive as having been previously observed at other installations, however, the blistering had not been prevf ously identified by GE.
C.
Action by Licensee:
All accumulators (145) have been removed, disassembled and inspected.
GE has recommended replacement of all accumulators having gross plating failures.
Two accumulators were shipped to GE for destructive metallography studies and evaluations.
A written report will be submitted to the Directorate of Licensing by January 26, 1973.
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