ML18052B368
| ML18052B368 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 11/05/1987 |
| From: | Smedley R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8711130060 | |
| Download: ML18052B368 (2) | |
Text
consumers Power l'OWERINli NllCHlliAN'S l'ROliRESS General Offices: 1945 West Parnell Road, Jackson, Ml 49201 * (517) 788-0550 November 5, 1987 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -
REVISED LOW TEMPERATURE OVERPRESSURE PROTECTION (LTOP)
The existing Palisades Technical Specifications do not include LTOP requirements which prevent the existing Palisades Plant Pressure/Temperature Curves from being exceeded.
This was reported to the NRC on November 18, 1985 by LER 85-023.
LER 85-023 notified the NRC that administrative controls would be put in place to prevent (1) the inadvertent start of a Primary Coolant Pump (PCP) when the steam generators are 70° hotter than the PCS, and (2) the inadvertent start of a High Pressure Safety Injection (HPSI) pump.
Revision 1 to LER 85-023 was submitted on December 23, 1986 to add a third potential overpressurization event, i.e., a charging/letdown imbalance.
Additional administrative controls were added to preclude this event.
During the present maintenance outage, investigation into the need for new LTOP setpoints has been completed and new LTOP requirements are being implemented before heatup.
Analysis was completed on November 4, 1987 and additional setpoints and requirements are being implemented before heatup.
These changes will be proposed for incorporation into the Technical Specifications as soon as practical but not later than 60 days from the date of this letter.
These future Technical Specifications are more restrictive than existing Technical Specifications and will be enforced by revising the LTOP setpoint and revised Administrative Controls.
The new PORV operation is being included in our Standing Orders and will be complied with as if it was an approved Technical Specification. If it is violated, actions taken will be the same as if Technical Specifications were violated.
The following is a description of the new LTOP requirements.
- 1.
PORV operation will be set at 310 psia when the temperature of one or more of the cold legs is less than 300°F.
- 2.
PORV operation will be set at 575 psia when the temperature of one or more of the cold legs is equal to or greater than 300°F and less than
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Nuclear Regulatory Palis~des Plant Revised LTOP November 5, 1987 e e Commission 430°F (430°F is above the point where the 60°F/hr heatup curve corresponds to 2500 psig - the setpoint of the lowest set PZR safety valve).
2
- 3.
The 430°F requirement in item 2 above is not a requirement when a bubble is formed in the pressurizer and the pressurizer level is less than or equal to 60%.
- 4.
During initial PCP starts (i.e., initiation of forced circulation),
steam generator temperature will be less than or equal to the PCS temperature.
- 5.
When the PCS temperature is less than 385°F, the control fuses for both HPSI pump motors will be removed.
(385°F corresponds to a pressure on the 60°F/hr heatup curve greater than the HPSI shutoff head.)
- 6.
Appropriate heatup rates and cooldown rates for given pressure/
temperature ranges will be included in Operating Procedure SOP-1 and operator training completed prior to heatup to ensure that the heatup and cooldown limits contained in Technical Specification 3.1.2 are not exceeded even when there is the most extreme charging/letdown imbalance.
The foregoing describes our immediate plans to meet LTOP requirements.
A description of our intermediate and long term plans will be submitted before December 1, 1987.
Richard W Smedley Staff Licensing Engineer CC Administrator, Region III, NRC NRC Resident Inspector - Palisades OC1187-0202-NL04