ML20210A653
| ML20210A653 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 09/10/1986 |
| From: | Allen C COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8609170295 | |
| Download: ML20210A653 (2) | |
Text
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Commonwealth Edloon h -) Address Reply to: Poet Omco Box 767 One Fwst Nabonel Plaza, Checa00, IEncis
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Checa00. IEnois 60800 0767 September. 10, 1986 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
LaSalle County Station Units 1 and 2 SOR Differential Pressure Switches NRC Docket Nos. 50-373 and 50-374
Dear Mr. Denton:
Based on conversations with your staff on September 10, 1986, we have attached to this letter five additional cosunitments with regard to our continued testing of SOR differential pressure switches at LaSalle County Station. These'are the same five commitments which were added to the SER for Unit 2 startup with the following exceptions:
1.
Unit 1 is specified vice Unit 2 l
2 '.
The level drop test on startup is omitted from Unit 1.
If you have any further questions regarding this topic, please contact this office.
Very truly yours,
.b k C. M. Allen Nuclear Licensing Administrator im Attachment 4
cc:
R. Bernero - NRR Dr. A. Bournia - NRR LaSalle Resident Inspector G. Wright - Region III h
OO egg 9170295e6ovio ADOCK 0500 3
1 l
2090K P
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- e' ATTAcl5ENT 1.
When any SOR differential pressure switch calibration setpoint check indicates a change which equals or exceeds the reject limit, the licensee shall declare the component and the associated channel inoperable and take the appropriate actions required by the LaSalle County Station Unit 1 Technical Specifications, and the licensee shall report the incident in accordance with the requirements of 10 CPR 50.72.
and 10 CPR 50.73.
l i
2.
The increased frequency of surveillance calibration testing program, which is conducted at atmospheric pressure, and the level drop tests, which are conducted at operating pressure for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and which are to be performed during shutdown for the next refueling outage, shall demonstrate stability of the trip setpoint, and shall confirm that the switches operate within the LaSalle Technical Specifications limits.
3.
The licensee shall continue performing its monthly Channel Functional Test, performed in accordance with the LaSalle Technical Specification.
4.
If one channel of a system of redundant channels (or similar equipment in redundant safety systems) is found to have an actual trip point that is outside the Technical Specifications or otherwise unacceptable for reliable system operation, then the redundant channels (or similar equipment) shall be tested as soon thereafter as practical.
5.
The licensee shall submit, for staff review, test results acquired through its periodic and increased surveillance calibration testing-program and from the SOR Inc. long term testing of the SOR Differential Pressure Switch, as the data becomes available, or when the LaSalle Unit 1 shuts down for the next refueling outage.
2090K
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