ML18052B365
| ML18052B365 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 11/06/1987 |
| From: | Smedley R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8711100492 | |
| Download: ML18052B365 (2) | |
Text
ee consumers Power l'OWERINli NllCHlliAN'S l'ROliRESS General Offices: 1945 West Parnell Road, Jackson, Ml 49201 * (517) 788-0550 November 6, 1987 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -
REVISED LOW TEMPERATURE OVERPRESSURE PROTECTION (LTOP) - Rev 1 This revision to our letter dated November 5, 1987 makes conservative changes to items 1, 2 and 5 of the description of new LTOP requirements.
Changes to items 1 and 2 allow lower setpoints to be used and facilitate the setpoint change.
The change to item 4 increases the temperature below which the HPSI pump control fuses will be removed.
Additionally, reference in item 2 to the setpoint of the lowest set PZR Safety Valve was corrected to. 2500 psia.
Revised sections are indicated by a vertical line in the right hand margin.
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.
OC1187-0202-NL04 l( 871:1100492 871106 PDR ADOCK 05000255 p
PDR 1
I
N~clear Regulatory Commission Pafisades Plant Revised LTOP November 6, *1987
- 1.
PORV operation will be set at ~ 310 psia when the temperature of one or more of the cold legs is ~ 300°F.
-1 i
- 2.
PORV operation will be set at ~ 575 psia when the temperature of one or more of the cold legs is > 300°F and ~ 430°F (430°F is above the point where the 60°F/hr*heatup curve corresponds to 2500 psia - the setpoint of the lowest set PZR*safety valve).
- 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 < 430°F, the control fuses for both HPSI pump motors will be removed.
2
- 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 I