ML20246N873
| ML20246N873 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 03/21/1989 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20246N867 | List: |
| References | |
| NUDOCS 8903280060 | |
| Download: ML20246N873 (4) | |
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ENCLOSURE 1-SAFETY EVALUATION
.BY THE OFFICE OF NUCLEAR REACTOR REGULATION RADIATION DATA MANAGEMENT SYSTEM (RDMS) / ISOLATION DEVICES
-PUBLIC SERVICE OF NEW HAMPSHIRE'(PSNH)
SEABROOK PLANT DOCKET NO. 50-443 I
l
1.0 INTRODUCTION
In July 1986, The NRC issued The Safety Evaluation Report related to The.
L l'
Operation of Seabrook Station Units 1 and 2; NUREG-0896, Supplement 5.
In l
-Section 7.5.2.2 the report described the interim measures taken, the licensees
l commitment to install qualified devices and the ' requirement to submit the qualification documentation to the staff for review prior to implementation.
This SER addresses the acceptability of the electrical isolation devices for use in the RDMS at Seabrook.
l The RDMS at Seabrook has various radiation monitors and their associated microprocessor computers designated as Class IE.
The RDMS also provides infomation to the Safety Parameter Display System (SPDS) which is classified as Non-Class IE. The SPDS must be electrically isolated from the RDMS to prevent faults in the Non-1E system from propagating to the 1E system. One.
acceptable method.for providing this isolation is to use qualified electrical isolation devices which have been shown by testing to be able to withstand the maximum credible electrical fault.
2.0 DISCUSSION AND EVALUATION The Seabrook Station uses General Atomics RM 80 isolators to provide the required isolation between the RDMS and the SPDS. Other isolation devices used for other inputs to the SPDS were previously reviewed and accepted under a separate SER.
The GA isolators had not been acceptable to the staff because the testing which had been done to qualify the devices took credit for the use of fuses between-the fault and the isolation devices.
'890328006o 890321 DR ADOCK 05000443 PDC
i.
2 Because these fuses could be easily replaced with higher amperage fuses which -
could negate the required protection the staff found the testing not acceptable.
The licensee took steps to allow plant operation for the first fuel cycle..
These steps included installing an assembly which would not allow inadvertent substitution of a higher amperage rated fuse. The staff found this interim installation acceptable. The licensee also consnitted to install non fuse dependent qualified isolation devices before startup following the first refueling outage.-
The licensee was required to submit the qualification documentation to the NRC for review before implementation.
In their letter dated November 18, 1988 PSNH submitted the required documentation which included " Test Report on Electrical Testing of Class IE Communication Isolation Device for Digital Radiation Monitoring System " (GA E-255-1389) and
" Test Report on Electrical Testing of Isolation Devices for Digital Radiation 4
Monitoring System", (GA E-255-1333). The staff has reviewed these reports and finds that they have demonstrated that. the GA RM 80 communication isolation device is an acceptable isolator for this application. The testing included applying a maximum credible fault of 165 VAC and 30 amps. During this test the protective fuse normally supplied as part of the' mounting board was bypassed.
The testing demonstrated that a fault on the non-IE equipment will not propagate to the Class 1E side. The fuse, though normally installed, is not required to -
provids the protective function and therefore these devices are acceptable.
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3.0 CONCLUSION
i Based on the staff's review and evaluation of the information supplied by the licensee the staff has concluded that the GA RM 80 communication isolation devices are acceptable for use interfacing the RDMS and the SPDS. The staff further concludes that the license condition described in SSER S Section 7.5.2.2 has been met in full and is no longer required.
4 Edward A Brown Seabrook Nuclear Power-Station 0
Public Service Company of New Hampshire i
cc:
Thomas Dignan, Esq.
E. Tupper Kinder, Esq.
John A. Ritscher, Esq.
G. Dana Bisbee, Esq.
Ropes and Gray Assistant Attorney General 225 Franklin Street Office of Attorney General Boston, Massachusetts 02110 208 State House Annex l
Concord, New Hampshire 03301 Mr. Bruce B. Beckley, Project Manager Public Service Company of New Hampshire Resident Inspector Post Office Box 330 US Nuclear Regulatory Comission Manchester, New Hampshire 03105 Post Office Box 1149 l
Seabrook, New Hampshire 03874 Dr. Mauray Tye, President Sun Valley Association Mr. A. M. Ebner, Project Manager 209 Summer Street United Engineers & Constructors i
. Haverhill, Massachusetts 01830 Post Office Box 8223 i
Philadelphia, Pennsylvania 19101
]
Robert Backus, Esq.
i Backus, Meyer and Solomon Steven Oleskey, Esq.
116 Lowell Street Office of the Attorney General i
Manchester, New Hampshire 03106 One Ashburton Place P.O. Box 330 Diane Curran, Esq.
Boston, Massachusetts 02108 Harmon and Weiss 2001 S Street, NW Carol S. Sneider, Esq.
Suite 430 Office of the Assistant Attorney General Washington, D.C.
20009 One Ashburton Place P.O. Box 330 Philip Ahren, Esq.
Boston, Massachusetts 02108-Assistant Attorney General State House Station #6 D. Pierre G. Cameron, Jr., Esq.
Augusta, Maine 04333 General Counsel Public Service Company of New Hampshire Mr. Edward A. Brown, President Manchester, New Hampshire 03105 and Chief Executive Officer New Hampshire Yankee Division Mr. James M. Peschel Public Service Company of Public Service Company of New Hamsphire New Hampshire P.O. Box 300 Post Office Box 300 Seabrook, New Hampshire 03874 Seabrook, New Hampshire 03874 Seacoast Anti-Pollution League Regional Administrator, Region I 5 Market Street U.S. Nuclear Regulatory Comission Portsmouth, New Hampshire 03801 475 Allendale Road 25 Maplewood Ave.
King of Prussia, Pennsylvania 19406 Ms. Diana P. Randall Ashod N. Amirian, Esq.
70 Collins Street Town Counsel for Merrimac Seabrook, New Hampshire 03874 376 Main Street Haverhill, Massachusetts 08130 Mr. T. Feigenbaum Public Service Company of New Hamsphire Post Office Box 330 Seabrook, New Hampshire 03874
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' Edward A. Brown, Public. Seabrook Nuclear Power Station Service Company of New Hampshire
'1 cc:
1 Mr. Calvin A. Canney, City Manager Mr. Alfred V. Sargent, City Hall Chairman i
126 Daniel Street Board of Selectmen Portsmouth, New Hampshire 03801 Town of Salisbury, MA 01950 Board of Selectmen Senator Gordon J. Humphrey RFD Dalton Road ATTN: Tom Burack Brentwood, New Hampshire 03833 531 Hart Senate Office Building U.S. Senate Ms. Suzanne Breiseth, Washington, D.C. 20510 Board of Selectmen Town of Hampton Falls i
Orinkwater Road Mr. Owen B. Durgin, Chairman Hampton Falls, New Hampshire 03844 Durham Board of Selectmen Town of Durham Mr. Guy Chichester, Chaiman Durham, New Hampshire 03824 Rye Nuclear Intervention Committee Jane Spector c/o Rye Town Hall Federal Energy Regulatory 10 Central Road Commission Rye, New Hampshire 03870 825 North Capital Street, NE Room 8105 l
Chairman, Board of Selectmen Washington D. C. 20426 RFD 2 i
South Hampton, New Hampshire 03827 I
Mr. R. Sweeney I
R. Scott Hill - Whilton Three Metro Center l
Lagoulis, Clark, Hill-Whilton Suite 610 I
& McGuire Bethesda, Maryland 20814 79 State Street Newburyport, Ma. 01950 Mr. Richard Strome, Director Ms. R. Cashman, Chairman New Hampshire Office of Emergency Board of Selectmen Management-Town of Amesbury State Office Park South Town Hall 107 Pleasant Street l
Amesbury, Massachusetts 01913 Concord, New Hampshire 03301 l
Adjudicatory File (2)
Honorable Peter J. Matthews Atomic Safety and Licensing Board Mayor, City of Newburyport Panel Docket City Hall U.S. Nuclear Regulatory Comission Newburyport, Massachusetts 01950 Washington, D.C.'20555 Mr. Donald E. Chick, Town Manager Congressman Nicholas Mavroules Town of Exeter 70 Washington Street 10 Front Street Salem, Massachusetts 01970 j
Exeter, New Hampshire 03823 Mr. G. Thomas l
Mr. John C. Duffett Public Service Company of President and Chief Executive Officer New Hampshire Public Service Company of New Hampshire Post Office Box 330 1000 Elm St., P.O. Box 330 Seabrook, New Hampshire 03874 l
-Manchester, New Hampshire 03105
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