ML19337B648
| ML19337B648 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 09/24/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 8010080397 | |
| Download: ML19337B648 (3) | |
Text
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION s
o WASHINGTON, D. C. 20555
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SEPTEMBER 2 4 1990 Docket No. 50-245 Mr. W. G. Counsil, Vice President Nuclear Engineering and Operations Northeast Nuclear Energy Conpany P. O. Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
By our letter dated August 7,1978, we informed you of deficiencies we identified in the design of the Hatch 2 regulator system for the motor generator (M-G) sets which supply power to the reactor protection system (RPS).
In general, the problem involved the possibility of the M-G producing power which was of a quality (High/ low outage, etc.)
that could be outside that for which the RPS has been demonstrated to be acceptable. Specifically, tha deficiencies involveo:
(1) Potential sequence of undetected single component failures which could adversely affect the operability of the RPS; and (2) Postulated component malfunctions inttiated by a seismic event which could adversely affect the operability of the RPS.
Our letter requested that you review your RPS power supply to determin'e if your system was susceptible to the same adverse possibilities that the staff had identified for.iatch 2.
He have completed our review of your response to our request and have determined that the power supoly RPS design at your facility is such that it could experience the same adverse conditions as described above.
Accordingly, we have determined that modifications should be performed to provide fully redundant Class lE protection at the interface of the non-Class lE power supplies and the RPS. We believe that the use of alarms or shift surveillance is acceptable as an interim measure but is not adequate for the long-term solution of our concerns.
We have found that the conceptual design proposed by the General Electric Company and the installed modification on Hatch 1 are acceptable solutions to our concern.
i 90100803
Mr. W. G. Counsil In view of the above, we believe that you should modify the power supply for the RPS at your facility. This modification should be implemented by the end of the next refueling outage.
Should this scheduled outage occur within the next six months, the modifications should be accomplished by the end of the subsequent refueling outage. We will perform a post-implementation review of your modification and will require appropriate Technical Specifications for the system.
We request that you provide within 60 days of your receipt of this letter: ytur (1) commitment to install a Class lE system, (2) schedule for completion of the modification and (3) schedule for submission of design information and proposed Technical Specifications.
Sincerely, y/
ennis M. Crutchfield, ief Operating Reactors Branch #5 Division of Licensing cc:
See next page
Mr. W. G. Counsil cc William H. Cuddy, Esquire Connecticut Energy Agency Day, Berry & Howard ATTN: Assistant Director Counselors at Law Research and Policy One Constitution Plaza Development Hartford, Connecticut 06103 Departnent of Planning and Energy Policy Natural Resources Defense Council 20 Grand S'creet 917 15th Street, N. W.
Hartford, Connecticut 06106 Washington, O. C.
20005 Director, Technical Assessment Division Northeast Nuclear Energy Conpany Office of Radiation Prograns ATTN: Superintendent (AW-459)
Millstone Plant U. S. Environmental Protection P. O. Box 128 Agency Waterford, Connecticut 06385 Crystal Mall #2 Arlington, Virginia 20460 Mr. James R. Hinnelwright Northeast Utilities Service Conpany U. S. Environmental Protection P. O. Box 270 Agency Hartford, Connecticut 06101 Region 1 Office ATTN:
EIS COORDINATOR Resident Inspector JFK Federal Building c/o U. S. NRC Boston, Massachusetts 02203 P. O. Box Drawer KK Niantic, Connecticut 06357 Waterford Public Library Rope Ferry Road, Route 156 Waterford, Connecticut 06385 First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 John F. Opeka Systens Superintendent Northeast Utilities Service Conpany P. O. Bux 270 Hartford, Connecticut 06101 1
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