ML19031C381
| ML19031C381 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 05/31/1977 |
| From: | Schneider F Public Service Electric & Gas Co |
| To: | O'Reilly J NRC/IE, NRC Region 1 |
| References | |
| IEB-77-001 | |
| Download: ML19031C381 (2) | |
Text
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Frederick W. Schneider Vice President Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201/622-7000 Production Mr. James P. O'Reilly, Director U. S. Nuclear Regulitory Commission Office of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr. O'Reilly:
NRC IE BULLETIN NO. 77-01 PNEUMATIC TIME DELAY RELAY SETPOINT DRIFT NO. 1 AND 2 UNITS SALEM NUCLEAR GENERATING STATION May 31, 1977 In accordance with IE Bulletin No. 77-01 dated April 29, 1977 and received_May 5, 1977, we offer the following:
- 1.
A review of plant design has been conducted by our Engineer-ing Department and Electric Production Department and it has been determined that the Salem units do not include ITE Imperial t~me delay~ relays in any safety-rel~ted or n6n-safety-related circuits.
- 2.
The time delay relays used in the Salem units.are provided by the Agastat Division of the Amerace -
ESNA Corporation.
These relays are all specified as having a repeat accuracy better than +/- 10% of the preset time a~justment.
The majority of these relays ~ave an accuracy better than +/- 5%
of the preset time adjustment.
- 3.
It is our conclusion that the Agastat time delay relays used at Salem are not subject to the drift problem severity described in NRC Bulletin No. 77-01.
This conclusion is based on the stated repeat accuracy of +/- 10% or better and the fact that tim~ delay relays in safety-related circuits are included in the applicable response time testing requirements of the plant Technical Specifications.
The response time tests would disclose relays which drift beyond acceptable limits.
l_
a..
. Mr. James P. O'Reilly 2 -
5/31/77 Should additional information be desired, we will be pleased to further discuss it with you.
CC:
Dr. Ernest Volgen~u Bethesda, Maryland 20014 Very truly yours,