ML20065A942
| ML20065A942 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 02/17/1983 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.2, TASK-TM SBN-472, NUDOCS 8302220331 | |
| Download: ML20065A942 (4) | |
Text
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PUBLIC SERVICE SEAB N S W M I Companyof NewHampshre Engineedng Office:
1671 Worceder Road Framinoham, Massachusetts 01701 (617) - 872-8100 Fe brua ry 17, 1983 SBN-472 T. F. B 7.1. 2 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Mr. George W. Knighton, Chief Licensing Branch 3 Division of Licensing Re f e re nce :
(a)
Construction Pernits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444
Subject:
Open Item Response:
(SRP 4.4; Core Performance Branch)
Dear Sir:
In response to the open item regarding NUREG-0737, Item II.F.2, Instrumentation for the Detection of Inadequate Core Cooling, we have enclosed a commitment to utilize the f ollowing instrumentation:
o Reactor Coolant Inventory Monitor o
Saturation Monitor o
Core Exit Thermocouples When detailed information on the Inadequate Core Cooling Instrumentation becomes available, the OL Application will be amended.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY l
n John DeVincentis Project Manager i
JD/fb l
cc: Atomic Safety and Licensing Board Service List 3
l 1
1 0302220331 830217 PDR ADOCK 05000443 A
PDR l
i e
ASLB SERVICE LIST Philip Ahrens, Esquire Assistant Attorney General Department of the Attorney General Augusta, ME 04333 Representative Beverly Hollingworth Coastal Chamber of Commerce 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 Lafayette Road Hamp ton, NH 03842 Jo Ann Shotwell, Esquire Assistant Attorney General Environmental Protection dureau Department of the Attorney General One Ashburton Place, 19th ?loor Boston, MA 02108
4.4 ICC Instrumentation Instrumentation that will be available to provide an unambiguous, av-to-interpret indication of inadequate core cooling (ICC) include:
t
- 1) Reactor coolant inventory monitor 2)
Saturation monitor
- 3) Core exit thermocouples We are in the process of selecting the instrumentation that will meet the requirements of the NRC letter, dated November 9, 1979(Saturation monitor, item 2.1.3.b) and NUREG 0737 (Instrumentation for detection of inadequate core cooling (ICC), item II.F.2) with additional clari-fication for the reactor coolant inventory monitor in NRC Generic Letter 82-28, dated December 10, 1982 (Inadequate Core Cooling Instru-mentation System). The following is the available L1 formation on the ICC instrumentation.
Detailed design information, including the information required by the documents previously mentioned, will be provided when it is available.
- 1) Reactor coolant inventory monitor The Westinghouse Reactor Vessel Level Instrumentation System (RVLIS) and the Combustion Engineering Heated Junction Thermocouple System (HJTC) are being evaluated for selection of a reactor vessel inventory system. As these systems operate on entirely different principles, further information cannot be provided until a system is selected.
- 2) Saturation Monitor The saturation monitor will receive inputs from redundant, safety grade, hot leg temperature and reactor coolant pressure instruments as well as core exit thermocouples. There will be a dedicated display to indicate the saturation margin. A pressure-temperature display with a saturation curve will also be available on the plant computer.
The device to calculate the saturation margin has not been selected as the decision may be affected by the reactor coolant inventory monitor selection.
- 3) Core Exit Thermocouples Core exit temperature is monitored by thermocouples that are part of the fixed / moveable incore detector system.
There are 58 thermocouples mounted at the tip of the bottom entry detector string, about 2 inches above the fuel.
_~
s I
All of the thermocouples will be displayed on a spatially oriented core map generated by the plant computer. The display as well as direct readout, hard copy, trends, and selective readings will be available on demand. Appropriate alarms will be available on the Video Alarm System (VAS).
A safety grade backup display will be provided where the readings of at least 16 thermocouples, 2 per quadrant per train, can be obtained in less than 6 minutes. The backup display method has not been determined as the decision may be affected by the reactor conlant inventory monitor selection.
The integration of all of the ICC instrumentation into the Seabrook Station will include consideration of human factors relating to use during normal and abnormal conditions, integration into the emergency procedures and operator training, and the relation to other alarms and indications.