ML20246L626
| ML20246L626 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 08/30/1989 |
| From: | Galle D COMMONWEALTH EDISON CO. |
| To: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8909070009 | |
| Download: ML20246L626 (2) | |
Text
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Commonwealth Edison -
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PRTORITY ROUTING
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'Mr..A.~Bert Davis-Regional Administrator-U.S.' Nuclear Regulatory Commission
-Region III'
- 799 Roosevelt Road
-Glen:Ellyn, IL 60137-
Subject:
. LaSalle County: Station Unit 2 August 26,:1989 Unit Scram-
-NRC Docket No. 50-374
- Dear Mr.' Davis;
'This letter identifies the actions Commonwealth Edison'is undertaking to address the event analysis and corrective actions for the subject Unit 2 Scram and the concerns identified with the' response of the reactor protection
. system.
These actions will provide Commonwealth Edison and the NRC with assurance that the same problem is unlikely to occur agcin.
Following is a
. summary list of our actions:
1.
Determine the-cause of the reactor protection system (RPS) observed response.
2.
Conduct _an event-analysis to show that the cause determined in Item 1 above is the only likely cause that describes the observed RPS response.
3.
. Perform a laboratory-inspection of the K14E contactor.
4 '.
Provide the following information for the RPS K14 contactor:
a.
The expected service life, and b.
The recommended preventive maintenance / inspection requirements.
' Identify the actions taken prior to startup consistent with these requirements.
Further, indicate the maintenance program in place prior-to the event for these contactors.
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.A.B. Davis
. -August 30,,1989'
- 15. Determine-the~cause of'the two of the four:first. stage pressure sensors' settings being-above the Technical Specification ~. limit'and identify corrective actians.
6, Determine'the cause of-the indication problems of the turbine stop valves and identify corrective actions.
7.
Determine the cause of the Hathaway computer inability to collect event
?
' data and actions to be taken to maximize Hathaway availability.
~8.
-Determine,the conditions that resulted in the turbine first stage.
pressure' chart; recorder being without ink and the programs which are in place to assure the availability of this;and other control room chart recorder.
9.
Submit.aformalreporttoNRCRegionIIIbkOctober1,1989,detailingthe findings and conclusions.
-The startup of. Unit 2 will.not occur without.the concurrence of the' Regional Administrator or his designee. He expect to have responses to items
'1 through 8 above for discussion with your staff prior to the startup.
If there are any further questions regarding this matter, please contact this office.
Very truly yours, Lv M S ' h 30f6}
D. P. Galle Vice President BHR Operations l
psk/Im-cc: _ Region III Inspector - LSCS P.C. Shemanski - Project Manager, NRR
.0269T:2
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