ML20237F119
| ML20237F119 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 12/21/1987 |
| From: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| CAL-RIII-87-26, NUDOCS 8712290371 | |
| Download: ML20237F119 (2) | |
Text
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i DEC 21 1987-CAL-RIII-87-026 Docket No. 50-373 Docket No. 50-374 Commonwealth Edison Company ATTN: Mr. Cordell Reed Senior Vice President Post Office Box 767 Chicago, IL 60690 Gentlemen:
This letter-confirms the telephone conversation between C. E. Norelius of this office and D. Galle of your staff on December 18, 1987, related to the Main Steam Isolation Valve (MSIV) failure (one outboard MSIV failed to remain shut) occurring at LaSalle. Unit 1 on December 16, 1987. With regard to this event, we understand that you will:
1.
Replace the remaining solenoid valve assemblies on Unit 1 (the failed MSIV solenoid has been replaced).
2.
Perform an initial evaluation of the quality (i.e., moisture, oil, particulate) of the air system supplying the failed valve and the valves whose solenotd 'asseablies are being replaced by sampling the immediate supply tc the solencid assemblies.
3.
Perform increased frequency testing of the MSIVs on Unit.1 as described in.a LaSalle Station letter to M. Jordan dated Deretber 18, 1967.
4s Perform further analysis.of the quality of the air system for tne purpose of detecting contaminants which may degrade tre solenoid assemblies.
5.
Disassemble the removed valves and exactne them for potential causes which could lead to failures similar to the one experienced.
Four of these valves may be disassemt' led by the vendor (ASCO) at the vendor's location. The purpose of the exxiitotion h k determine'a root cause for the failure.
6.
Perform a test of the dual solenoid valves on the Unit 2 MSIVs to determine if a similar problem exists on Unit 2.
7.
Submit to NRC Region III a formal report of your findings and conclusions within 30 days of receipt of this letter, g
Throughout this investigative effort, we understand that you will take those actions necessary to ensure that complete documentary evidence of the "as found" condition of equipment being inspected is maintained.
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8712290371 871221 NFIRMATORY ACTION LETTER i
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PDR.ADOCK 05000373
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C0NFIRMATORY ACTION LETTER DEC 11 1987 Commonwealth Edison Company 2
We understand that actions 1 and 2 will be accomplished prior to startup of Unit 1 and that startup of Unit.1 will not occur without concurrence of the Regional Administrator or his designee.
Items 3 thru 6 should be addressed promptly with item 6 being completed within 3 days of the date of this letter.
Further, we understand that you will promptly notify the NRC of any finding relative to these actions or the performance of the MSIVs.
Issuance of this Confirmatory Action Letter does not preclude the issuance of an order requiring implementation of the above commitments.
None of these actions should be construed to take precedence over actions which yCJ feel necessary to ensure plant and personnel safety.
Please let us know immediately if your understanding differs from that set out above.
Sincerely, l
Original Signgd bg A. Bert Davis Regional Administrator cc:
D. Dutterfield, Nuclear.
Licensing Manager G. J. Diederich,' Plant Manager DSD/DCB (RIDS)
Licensing Fee Management Branch Resider.t Inspector, RIII Richard Hubbard J.
W., McCaffrey. Chief, Public Utilitiet Division l
David Rosenblatt, Governor's Office of Consumer Services lC E. L. Jordar, AE00 i
J. P. Taylor, OE00 T, E. Murley, NRR J. Lieberman, OE R. Cooper, ED0 W. Lanning, NRR F. Miraglia, NRR G. Holahan, NRR D.'Crutchfield, NRR J. Partlow, NRR M. Jordan, SRI J. Strasma, RIII R. Lanksbury, RIII L
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