ML18052A148
| ML18052A148 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 10/31/1985 |
| From: | Kuemin J CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| GL-82-28, NUDOCS 8511050130 | |
| Download: ML18052A148 (2) | |
Text
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consumers Power company General Offices: 1945 West Parnell Raad, Jackson, Ml 49201 *.{517) 788-0550 October 31, 1985
- Director, Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -
PALISADES PLANT -
DEFERMENT OF SUBCOOLING MARGIN MONITOR MODIFICATION Consumers Power Company letters dated May 31, 1984 and October 19, 1984 provided updates to our response to Generic tetter 82-28.
Our letters included a commitment to upgrade the existing subcooled margin monitor (SMM) to extend the readout range to meet NUREG-0737 requirements* during the next refueling outage.
This letter is to inform the NRC of our decision to revise the E;chedule for upgrade of the SMM to the second refueling outage from now, which will coincide with installation of the reactor vessel level monitoring system.
Our commitment to supply environmentally qualified core exit thermocouples during the 1985 refueling outage will still be met; Upgrade of the SMM consisted of installing wide-range temperature transmitters to provide the SMM with a temperature span of 50-700°F to replace the existing 515-615°F input span and modifying the SMM units to provide the extended range.
Engineering was completed and these modifications were to be installed during the upcoming refueling outage.
Engineering for these modifications was based on simultaneous accomplishment of modifications to the Reactor Protec-tion System (RPS).
The RPS modHication included removal of existing equip-ment from control room panels which would free up space for the new temperature transmitters.
Difficulties in procuring material for the RPS modification forced a deferment of the RPS modification until the second refueling outage and eliminated the space available for installing the new SMM temperature transmitters.
An evaluation of the engineering required to relocate th.e temperature trans-mitters to another panel has shown that insufficient time and manpower is
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Director, Nuclear Reactor Regulation P"llisades Plant Subcooling Margin Monitor October 31, 1985 Indication of subcooled margin is currently available in the control roo*m for plant conditions when primary temperatures are above 515°F.
For primary coolant system temperatures below 515°F, procedures are in place for deter-mining the subcooled margin available based on use of pressure/temperature diagrams.
The present subcooled margin monitor meets NUREG-0737 and Regulatory Guide 1.97 requirements for redundancy and is powered from a class lE power supply.
2 Based on the ability to display subcooled margin for primary coolant tempera-tures above 515°F and the ability to determine subcooled margin for tempera-tures below 515°F and the fact that the core exit thermocouples will be environmentally qualified following the refueling outage, we conclude that the plant can be ~perated safely during the period prior to installation of the SMM upgrade*.
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Staff Licensing Engineer CC Administrator, Region III, USNRC NRC Resident Inspector - Palisades OC1085-0016-NL02