ML20080M519
| ML20080M519 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 09/29/1983 |
| From: | Gallagher J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20080M523 | List: |
| References | |
| NUDOCS 8310040189 | |
| Download: ML20080M519 (2) | |
Text
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e PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BOX 8699 JOSEPH W. G ALLAGH ER (2151841-5003 ELECTRIC pm0 DUCT ON DEPARTe8ENT September 29, 1983 Docket Nos. 50-277 50-278 M r. John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555 SUBECT:
Peach Bottom Reactor Protection System (R.P.S. ) Overvoltage & Undervoltage Surveillance Setpoints
Reference:
1)
Application f or Amendment of Operating License Requesting Change to Peach Bottom Technical Specifications Relating to the Reactor Protection System, Filed December 23, 1981 2)
Letter to J.
F. Stolz from S. L. Daltroff, dated March 30, 1983 3)
Telephone Conversation between G. E. Gears (NRC) and B. L. Clark (PECo) on July 26, 1983
Dear Mr. Stolz:
This letter will document information provided to a member of your staff during a telephone conversation (Reference
- 3) dealing with Peach Bottom Reactor Protection System overvoltage and undervoltage setpoints.
On December 23, 1981, Philadelphia Electric Company submitted an Application for Amendment of Operating Licenses DPR-44 and DPR-56 which, among other. things, proposed an overvoltage setpoint of 132 volts and an undervoltage setpoint of 108 volts
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e Mr.' John F. Stolz Page 2 for a Peach Bottom Units 2 and 3 Reactor Protection System Modification.
In response to an NRC request for information, we provided voltage drop values, between MG sets and scram solonoid fuse panels of 2 to 3 volts.
Subsequently, the NRC staff questioned the validity of the overvoltage setpoint based on the 2 to 3 voltage drop.
As reported in the referenced telephone conversation, we have since completed a more extensive voltage drop survey which included many readings from both Units and both.RPS buses.
The survey determined that the voltage drop has an average range of 6.5 to 7.5 volts.
Therefore, to maintain RPS equipment voltages within design limits, these surveillance setpoints should be changed from their previous values to the ones provided on the attached pages.
In.the interest of conservatism, the 6.5 voltage drop was used to compute the overvoltage setpoint of 131 volts, and the 7.5 voltage drop was used to compute the undervoltage setpoint of 113 volts.
Please incorporate the attached pages into our Application for Amendment (Reference 1).
If you have any questions, do not hesitate to call.
Very truly yours, WOO- %
Attachments cc: A. R. Blough, Site Inspector l
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