ML20067B128
| ML20067B128 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 11/30/1982 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| SBN-392, NUDOCS 8212060059 | |
| Download: ML20067B128 (3) | |
Text
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8 United States Nuclear Regulatory Commission November 30, 1982 Attention:
Mr. George W. Knighton Page 2 This design change will allow the operators to power the SUF pump from the on-site emergency power supply without having to physically move a circuit breaker from bus 4 to bus E5.
Should an occasion ever arise where it is necessary to power the SUF pump from the on-site emergency power supply, only the following evolutions need be perfonned:
1.
Dispatch an operator to the Switchgear Room, 2.
Rack out the circuit breaker on bus 4, 3.
Operate the selector switch on bus 4 to the " bus E5" position, and 4.
Rack in the circuit breaker on bus E5.
The Control Room operator then has control of the SUF pump which will be powered by the emergency diesel generator.
Because the Switchgear Rooms are located only two floors below the Control Room, are in the same building as the Control Room, and as such, see essentially the same environment and are immediately accessible via a stairwell directly outside both the Control Room l
and the Switchgear Room, the entire evolution described above is f
expected to take approximately five minutes to accomplish.
2.
Valves FW-V163 and FW-V156, which permit the SUF pump to supply steam generator feedwater via the EFW s'tpply header, will be equipped with electrical motor operators. 'Ihese MOVs will be powered by the same on-site emergency power source as the SUF pump and will be controlled from the main control board.
This design change will permit re-alignment of the SUF pump discharge to the EFW discharge header without requiring manual operator action outside the control Room.
It is hoped that the above information will assist your Staff in their evaluation of the Seabrook Station Emergency Feedwater System and preparation of the Safety Evaluation Report. If further information is necessary, please feel free to contact us.
Very truly yours,
/
J. DeVincentis A Project Manager JDV/fsf cc Mr. Robert Jaross, Argonne National Laboratories Atomic Safety and Licensing Board Service List 8212060059 821130 PDR ADOCK 05000443 E
s e
swan sum IPUEBLIC SERVICE Engineedng Office:
Companyof NewHampshw e 1671 Worcester Road Frominoham. Massachusetts 01701 (617) - 872 - 8100 November 30, 1982 SBN-392 T.
F. H.4.4.98 B.7.1.2 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Mr. George W. Knighton, Chief Licensing Branch No. 3 Division of Licensing
References:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b)
PSNH Letter, dated August 27, 1982, " Reliability Analysis of the Emergency Feedwater System",
J.
DeVincentis to F. J. Miraglia (c) PSNH Letter, dated September 7, 1982, "Seabrook Station Emergency Feedwater System Design Changes", J. DeVincentis to F. J. Miraglia subject:
Additional Design Changes to the Seabrook Station Emergency Feedwater System
Dear Sir:
During the Staff review of the Seabrook Station Ettergency Feedwater System (EFW), a number of design changes have been recommended and are presently being implemented. These changes were based on the review of the Emergency Feedwater System Reliability Analysis (Reference (b)] and were described in Reference (c).
Further review has revealed additional modifications which will enhance the availability and reliability of the EFW System.
The following describes additional design changes which are being implemented relative to tne Seabrook EFW System. These design changes will be incorporated into a revision of the Final Safety Analysis Report when the final details are established.
1.
An additional circuit breaker for the Startup Feedwater Pump, FW-P-ll3, will be purchased and installed in the alternate electrical supply cubicle on the emergency electrical bus E5.
This Og[
circuit breaker will be in addition to the normal circuit breaker installed on non-emergency bus 4.
Suitable interlocks will be provided to prevent inadvertent closure of both breakers at any time.
ASLB SERVICE-LIST Philip Ahrens, Esquire Assistant Attorney General Department of the Attorney General Augusta, ME 04333 Representative Bever
'lollingworth Coastal Chamber of C e tree 209 Winnacunnet Road Hampton, NH 03842 William S. Jordan, III, Esquire Harmon & Weiss 1725 I Street, N.W.
Suite 506 Washington, DC 20006 E. Tupper Kinder, Esquire Assistant Attorney General Office of the Attorney General 208 State House Annex Concord, NH 03301 Robert A. Backus, Esquire 116 Lowell Street P.O. Box 516 Manchester, NH 03105 Edward J. McDermott, Esquire Sanders and McDermott Professional Association 408 Laf ayette Road Hampton, NH 03842 Jo Ann Shotwell, Esquire Assistant Attorney General Environmental Protection Bureau Department of the Attorney General One Ashburton Place, 19th Floor Boston, MA 02108
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