ML20151C975
| ML20151C975 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/06/1988 |
| From: | Boyle M Office of Nuclear Reactor Regulation |
| To: | Mroczka E NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 8804130306 | |
| Download: ML20151C975 (3) | |
Text
April 6, 1988 e
Docket No.: 50-245 DISTRIBUTION
.Docketitle-NRC T Local PCRs Mr. Edward J. Mroczka PDI-4 Files Senior Vice President SVarga Nuclear Engineering and Operations BBoger Northeast Nuclear Energy Company SNorris Post Office Box 270 MBoyle Hartford, CT 06141-0270 LMarsh OGC-WF EJordan
Dear Mr. Mroczka:
JPartlow ACRS (10)
Re: Snubber Visual Inspection Interval - Millstone Nuclear Power Station, Unit No. 1 By letter dated March 14, 1988 Northeast Nuclear. Energy Company (NNECO) reported that, during a November 16, 1987 drywell entry, it was noticed that one of the hydraulic snubbers was leaking fluid and.its reservoir level was low (this event was also reported in Licensee Event Report 87-043-00 on December 16,1987). As a result of this finding, NNEC0 stated that a visual inspection of all safety-related snubbers in containtrent was performed to ensure that this condition did not exist on any of the remaining snubbers. The results of this inspection indicated that a total of two snubbers were found _to be low in hydraulic fluid and both failed operability tests and were declared inoperable. The two snubbers were subsequently disassembled and were found to have failed as the result of improper installation of seals.
NNEC0, in its March 14, 1988 letter, stated that a reduced inspection interval, based upon Technical Specification acceptance criteria, is not necessary because:
1.
The failure was identified as improper installation, not as the result of degradation or aging.
2.
All inaccessible safety-related hydraulic snubbers were insp9cted during the November 1987 shutdown.
3.
Corrective actions were taken. Vechanical repairs were completed and maintenance personnel training has been revised.
Thus, NNECO stated that the Technical Specifications do not require a reduced visual inspection interval for.,nubbers.
The staff has reviewed the information provided in your March 14, 1988 letter and Technical Specification Section 3/4.6 and the associated bases and conclude 8804130306 880406 PDR ADOCK 050 5
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. that the currently required inspection interval of 18 months i 25% is the proper interval. The circumstances resulting in declaring the two snubbers inoperable do not meet the Technical Specification criteria for reductions to the visual inspection interval.
Sincerely, original signed by Michael L. Boyle, Project Manager Project Directorate I-4 Division of Reactor Projects I/II cc: See next page l
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&, Mdi9 LA:PDI-4 PM:PDI-0:PD SNctFrF MBoyle JStolz 3/30/88 J,/4/88 c,3/(/88 l
l Mr. Edward J. Mroczka Millstone Nuclear Power Station Northeast Nuclear Energy Company Unit No. I cc:
Gerald Garfield, Esquire R. M. Kacich, Manager Pay, Berry and Howard Generation Facilities Licensing Counselors at Law Northeast Utilities Service Company City Place Post Office Box 2.0 Hartford, Connecticut 06103-3499 Hartford, Connecticut 06141-0270 W. D. Romberg, Vice President D. O. Nordquist Nuclear Operations Fanager of Quality Assurance Northeast Utilities Service Company Northeast Nuclear Energy Company Post Office Box 270 Post Office Box 270 Hartford, Connecticut 06141-0270 Hartford, Connecticut 06141-0270 Kevin McCarthy, Director Regional Administrator Radiation Control Unit Region I Department of Environn. ental Protection U. S. Nuclear Regulatory Commission State Office Building 475 Allendale Road Hartford, Connecticut 06106 King of Prussia, Pennsylvania 19400 Bradford S. Chase, Under Secretary First Selectmen Energy Division Town of Waterford Office of Policy and Management Hall of Records 80 Washington Street 200 Boston Post Road Hartford, Connecticut 00106 Waterford, Connecticut 063FF S. E. Scace, Station Superintendent W. J. Rayrend, Resident Inspector Hillstone Nuclear Power Statien Millstone Nuclear Power Staticn Ncrtheast Nuclear Energy Company c/o U. S. Nuclear Regulatory Commission Post Office Box 128 Post Office Box 811 Waterford, Connecticut 06385 Niantic, Connecticut 06357 J. P. Stetz, Unit Superintendent Millstone Unit No. 1 Northeast Nuclear Energy Conpany Post Office Box 128 Waterford, Connecticut 06385 i
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