ML18092A996
| ML18092A996 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 01/17/1986 |
| From: | Corbin McNeil Public Service Enterprise Group |
| To: | Varga S Office of Nuclear Reactor Regulation |
| References | |
| TASK-2.F.2, TASK-TM NLR-N86006, NUDOCS 8601270090 | |
| Download: ML18092A996 (6) | |
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Public Service Electric and Gas Company Corbin A. McNeil!, Jr.
Vice President -
Public Service Electric and Gas Company P.O. Box236, Han cocks Bridge, NJ 08038 609 339-4800 Nuclear January 17, 1986 NLR-N86006
- u. S. Nuclear Regulatory Commission Off ice of Nuclear Reactor Regulation Division of Licensing Washington, D. C.
20555 Attention:
Mr. Steven A. Varga, Chief Operating Reactors Branch, No. 1
Dear Mr. Varga:
INADEQUATE CORE COOLING TMI ITEM II.F.2 SALEM GENERATING STATION UNITS 1 AND 2 DOCKET NOS. 50-272 AND 50-311 Pursuant to discussions held at the NRC Bethesda off ices on December 3, 1985, we are providing a description of modifications to our Core Exit Thermocouple System Upgrade proposals contained in our (E. A. Liden to s. A. Varga} letters dated June 19, 1984 and September 17, 1984.
Should you have any additional questions, we will be pleased to discuss them with you.
8601270090 860117 PDR ADDCK 05000272 P
PDR Attachment Sincerely,
Mr. Steven A. Varga C
Mr. Donald C. Fischer Licensing Project Manager Mr. Thomas J. Kenny Senior Resident Inspector 1-17-86
Core Exit Thermocouple System Proposed Modifications
The following is a description of the new Core Exit Thermocouple System Upgrade Proposal:
- No Change -
The in-containment portion of the Inadequate Core Cooling Instrument (ICCI) System will utilize the existing Core Exit Thermocouples (CET) for instrumentation monitoring.
These thermocouples are of the Type K design which are considered qualified by Regulatory Guide 1.97, Revision 3.
- No Change -
Upon exiting the reactor vessel head area, the CET design incorporates qualified Combustion Engineering, Inc. (CE) connectors and mineral insulated (MI) cables.
This MI cable has been routed from the CET connectors to connector plates located above the head area.
Use of MI cable assures adequate cable separation in the vicinity of the reactor vessel head.
- Change - Existing Proposal -
MI cable will then be routed via two independent paths to two qualified electrical penetration assemblies.
New Proposal - Environmentally qualified organic insulated thermocouple cable qualified by National Technical Systems (not MI cable) will then be routed via two independent paths to two qualified electrical penetration assemblies.
- No Change -
The environmentally qualified penetration feed throughs will be of the type designed to accept thermocouple signal cable.
- Change - Existing Proposal -
The qualified CET system will not use the existing Reference Junction Box
( RJB)
- New Proposal -
Two seismically qualified reference junction boxes will be located in the non-harsh enviroriment of the electrical penetration area.
Thermocouple cable will be routed from the electrical penetration to the Reference Junction Box.
Existing fully qualified IEEE organic cable (copper conductor rather than chromel-alumel conductors) will be used from the RJB up to the backup displays.
- Change - Existing Proposal -
Two fully qualified microprocessor-based backup displays will be utilized.
The backup display will be capable of displaying core exit temperature on a digital meter.
The backup display will be supplied by Combustion Engineering, Inc.
New Proposal -
Two fully qualified multipoint recorders (30 point) will be used for the backup display.
This will meet the requirements for backup displays with respect to II.F.2, Attachment 1.
The backup display will be supplied by Leeds and Northrup (Model 250 multipoint recorder).
See Backup Display.
- No Change - Isolation devices will be used between the backup display and the primary display.
The isolation device however, will not be an integral part of the backup display.
The isolation device will be qualified.
- Change - Existing Proposal -
The P-250 (Plant Computer) will be used as the non-class lE primary display.
New Proposal -
The primary display will consist of the P-250 (Plant Computer) and the Safety Parameter Display System.
Channel A Backup Display Signals will be diverted to provide full core coveraqe to the SPDS System (50% of incore thermocouples).
Channel B Backup Display Signals will be diverted to provide full core coverage to the P-250 Plant Computer (50% of incore thermocouples).
- Change - Existing Proposal -
The current Subcooling Margin Monitor (SMM) will be upgraded with an additional backup SMM display.
New Proposal -
The non-class lE primary displays will be available for the Subcooling Margin Monitor Display.
This will consist of the P-250 plant computer and the SPDS system.
The incore thermocouples will be Class lE qualified up to their signal isolators.
The wide range pressure inputs are presently Class lE up to their signal isolators.
- Change -
Existing Proposal -
The Core Exit Thermocouple upgrade commitment is for the sixth refueling (1986) for Unit 1 and third refueling (1986) for Unit 2.
New Proposal -
The new commitment schedule for the Core Exit Thermocouple Upgrade is the seventh refueling (1987) for Unit 1 and the fourth refueling (1988) for Unit 2.
Backup Display
- The CET system backup display proposed for this upgrade effort is the fully qualified Leeds and Northrup multipoint recorder model 250.
This backup display will consist of one 30 point recorders for each channel and will be located in the Auxiliary Equipment Room.
a)
Units have been qualified per the procedures of IEEE Std. 323-1974 (including IEEE Std. 344-1975),
and manufactured under a Quality Assurance Program that meets the applicable criteria of 10CFR50, Appendix B, and ANSI N45.2.
b)
Units have the ability to read 16 thermocouples in less than six minutes.
Optional printing speeds per point are available.
c)
Units will have a measurement and display range of 200° to 2300°F.
d)
Display will be human-factored.
e)
Special circuitry provides an "open circuit" identification feature which prints out any open points on the right margin of the chart.
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