ML20215A260
| ML20215A260 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 06/03/1987 |
| From: | Allen C COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 3165K, NUDOCS 8706160585 | |
| Download: ML20215A260 (2) | |
Text
,
m.-.
.. _. _. ~
[,,
) & ~:'
/,,
(
One Fast Nebonel Plaza, Chcego, IEinois I
1 n/ Address Reply to: Post Ofilce Box 767.c
^
~. %gj. Chce00, Iginois 60600 0767 -
June 3, 1987 i U'.S.' Nuclear Regulatory Comunission
--Attn:..-Document Control Desk 2
~ Washington, DC ?20555 g
4
Subject:
LaSalle County _ Station Unit 2
~
i New setpoint and. limits for Main Steam Line Flow Switches NRC Docket No. 50-374
{
References.(a):.-Letter dated March 10, 1987 from C. M. Allen to the US NRC
'(b): Letter dated April'1, 1987
-from R. M. Bernero to D. L. Farrar
~
! entlemen:
G In accordance with reference (a), Commonwealth Edison committed to notify the United States Nuclear Regulatory Commission (NRC) of any changes
~
in the action limits,-reject-limits, or setpoints for any SOR differential L..
pressure switch installed in a safety application at LaSalle. This notification is required to be~a formal docketed submittal.
I'
.Comunonwealth Edison provides the following information regarding changes to the action limits, reject limits.:and the.setpoint for the Unit-Two Main Steam Line High Flow Switches. The new values are:
11'3.0 psid Setpoint'
.=
0 i
Action limits = +/-4.8 psid
- . Reject. limits = +/-8.2 psid
. These new limits were: achieved by improving the population of SOR l
- differential pressure switches serving-as Unit Two Main Steam Line High Flow Switches.. Ten of the sixteen switches serving in this capacity have been-replaced and all.of the presently installed switches have been
're-characterized for repeatability and static offset.- Based on testing
>perforined at LaSalle County Station all switches installed in this i_
application 4performt.d within 3.2 psid for repeatability, and 4.8 psid for
~ ' static. offset. The new setpoint and limits were calculated using the same unethodology used for the original determination but with the new repeatability and static offset values, b
Q f
3:
PDR ADOCM 05000374 l'Ng I
8706160585 870603 I
._P-PDR 9
I e-~-
.,ni,,
- n--,-,,--,~,
,r
o o The revision to the setpoint and limits have been reviewed and approved by the on-site review and investigation function. This review was completed on May 15, 1987, and the revised setpoints were implemented on May 17, 1987.
If you require any more information regarding this matter, please contact this office.
C. M. Allen Nuclear Licensing Administrator cc: Regional Administrator RIII P. Shemanski - NRR NRC Resident Inspector - LSCS 3165K