ML20202H221
| ML20202H221 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/03/1986 |
| From: | Charemagne Grimes Office of Nuclear Reactor Regulation |
| To: | Opeka J NORTHEAST UTILITIES |
| Shared Package | |
| ML20202H224 | List: |
| References | |
| NUDOCS 8604150161 | |
| Download: ML20202H221 (4) | |
Text
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UNITED STATES 8
p, NUCLEAR REGULATORY COMMISSION j
WASHINGTON, D. C. 20555 3
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April 3,1986 Docket No.: 50-245 Mr. John F. Opeka, Senior Vice President Nuclear Engineering and Operations Northeast Utilities Energy Company Post Office Box 270 Hartford, Connecticut 06141-0270
Dear Mr. Opeka:
SUBJECT:
INSPECTION AND REPAIR OF REACTOR COOLING PIPING SYSTEMS -
INTERGRANULAR STRESS CORROSION CRACKING (IGSCC) l
~
Re:
Millstone Nuclear Power Station, Unit No.1
)
By letter dated December 6, 1985, the Commission issued Amendment No. 107 to Provisional Operating License No. DPR-21 for the Millstone Nuclear Power Station, Unit No. 1.
That amendment approved a number of changes to the technical specifications, which you had requested, and allowed full power operation l
following completion of Reload 10. We also noted, in that letter, that our detailed Safety Evaluation of the inspection and repairs performed during the Reload 10 refueling outage would be transmitted separately.
We have completed our review of your submittals, dated July 1,1985 (NRC Safety Evaluation dated August 14,1985), December 12, 1985, January 13, 1986 and February 12, 1986, regarding the inspection and repairs performed on the jet pump instrumentation nozzle assemblies, isolation condenser piping and high pressure coolant piping during the 1985 refueling outage. As described in the enclosed Safety Evaluation, we conclude that the IGSCC inspection and repairs performed during the 1985 outage provide reasonable assurance that the Millstone Unit 1 plant can be safely operated for the current fuel cycle ending July-August 1987.
i During the 1985 outage, a total of 115 welds were ultrasonically inspected.
Cracks were found in seven welds, including one weld (RCAJ-1) which was reported to have an acceptably small crack during the previous refueling outage. All of the six (6) cracked welds found during the Reload 10 outage were repaired by weld overlay. Weld RCAJ-1 did not require repair because there was no apparent crack growth or new cracks since the cracks were initially detected during the 1984 refueling outage (Reload-9).
Because of continued interest in the experiences of IGSCC in BWR piping, we will require that a plan for inspection and/or modification of the recirculation piping and other appropriate portions of the reactor coolant pressure boundary for the next refueling outage (Reload 11) be submitted for our review and coment at least three months before the start of the Reload 11 refueling outage.
4 8604150161 860403
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PDR ADOCK 05000245 4
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April 3,1986 John F. Opeka 't
'i This request affects. fewer than ten respondents and, therefore, an OBM clearance is not required in accordance with P. L.96-511. Should you have any questions concerning this matter, please contact the Millstone 1 Project Manager, James J. Shea (301-492-7639).
Sincerely, Original signed by: C. I. Grimes-1 Christopher I. Grimes, Director Integrated Safety Assessment Project Directorate Division of.PWR Licensing - B
Enclosure:
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I John F. Opeka ' ~'
This request affects fewer than ten respondents and, therefore, an OBM clearanc~ e is not required in accordance with P. L.96-511.
Should you have any questions James J. Shea (301-492-7639).concerning this matter, please contact the Millstone Sincerely, c
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uAu th Christopher I. Grimes, Director Integrated Safety Assessment Project Directorate Division of PWR Licensing - B Encissure:
As sta'ed cc: See next page
Mr. John F. Opeka Northeas t Nuclear Energy Company Millstone Nuclear Power Station Unit No. I cc:
Gerald Garfield, Esquire Day, Berry & lioward Kevin McCarthy, Director Counselors at Law Radiation Control Unit City Place Department of Environmental Protection Hartford, Connecticut 06103-3499 State Office Building Edward J. Mroczka Hartford, Connecticut 06106 Vice President, Nuclear Operations Northeast Utilities Service Company Richard M. Kacich, Supervisor Post Office Box 270 Operating Nuclear Plant Licensing Northeast Utilities Service Company Hartford, Connecticut 06141-0270 Post Office Box 270 State of Connecticut Hartford, Connecticut 06141-0270 Office of Policy and Management ATTN: Under Secretary Energy Division 80 Washington Street Hartford, Connecticut 06106 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 Northeast Nuclear Energy Company ATTN:
Superintendent Millstone Nuclear Power Station P. O. Box 128 Waterford, Connecticut 06385 Resident Inspector c/o U.S. NRC Millstone Nuclear Power Station P. O. Box 811 Niantic, Connecticut 06357 First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 i
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