ML20044F933
| ML20044F933 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 05/21/1993 |
| From: | Randolph G UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| ULNRC-2803, NUDOCS 9306010216 | |
| Download: ML20044F933 (3) | |
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Callaway Plant Post Othce Box 620.
Fution, Misscun 652$1 3166I6 824S
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UVI()N May 21,1993 6*'l7);,88$'#8 -
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a U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 ti ULNRC -2803 Gentlemen:
REPLY TO NOTICE OF VIOLATION INSPECTION REPORT NO. 50-483/93003 CALLAWAY PLANT j
This responds to Mr. L. Robert Greger's letter dated April 27,1993, which transmitted a 1Totice of Violation for events discussed in Inspection Report 50-483/93003. Our response to the violation is presented in the attachment.
None of the material in the response is considered proprietary by Union Eectric Company.
If you have any questions regarding this response, or if additional information is required, please let me know.
Very truly yours, b
f G. L. Randolph GLR /tmw L
Attachment:
- 1) Response to Violation cc:
A. B. Davis - Regional Administrator, USNRC Region III
- 1. N. Jackiw - Chief, Reactor Projects Section 3C, USNRC Region III L. R. Wharton - USNRC Licensing Project Manager (2 copies)
USNRC Document Control Desk (Original)
Manager - Electric Department, Missouri Public Service Commission B. L. Bartlett - USNRC Senior Resident Inspector Shaw, Pittman, Potts, and Trowbridge 970Cd
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I D 9306010216 930521' j
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Attachment to ULNRC-2803 Page1 of 2 Slatement of Violation During an NRC inspection conducted from February 1 through April 8,1993, a violation of NRC requirements was identified. In accordance with the " General Statement of Policy and Procedure for NRC Enforcement Actions," 10 CFR Part 2, Appendix C, the violation is listed below:
10 CFR 50, Appenaix Is, Criterion XVI, Corrective Action, states, in part, that for significant conditions adverse to quality, corrective actions shall be taken to preclude i
repetition.
i Contrary to the above, corrective actions to prevent additional water hammer events during routine operational evolutions for the essential service water (ESW) system were inadequate, in that on March 23,1993, a water hammer occurred when the "A" ESW purnp was restarted during the conduct of routine surveillance procedure OSP-EF-P001 A.
This is a Severity Level IV violation (Supplement 1).
Reason for the Violation Corrective action for a previous water hammer event included adding a caution:
statement in the normal operating procedure for the essential service water system.
This caution statement directed personnel to isolate the containment coolers if flow was stopped through the containment cooler and the return was not aligned to flow over the cooling tower fill. However, the wording of the caution was not specific ir reqriring both inlet and outlet valves to be closed.
Operations personnel performing a series of surveillance tests on the ESW system did not fully understand the effects of securing flow through the system. The operators thought that closing the containment cooler return isolation valves would prevent draining cf the coolers as well as any water hammer when flow was restored. They i
failed to realize that the containment coolers could also drain back through the inlet valves.
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9 Attachment to ULNRC-2803 Page 2 of 2 Corrective Steos that have been taken and results achieved:
Operations has issued a Night Order to warn personnel of the potential effects of.
interrupting flow in the ESW train and the causes of water hammer. Caution tags have been placed on the ESW pump controls to heighten operator awareness of the potential' for water hammer events if flow is interrupted in the ESW system. The caution in the normal operating procedure has been revised to clearly specify the need to isolate both the supply and return valves for the containment coolers prior to restoring ESW How after it has been interrupted. The caution tags and night order are short term actions.
The caution tags will be removed from the ESW pump controls when procedures and training are complete.
Corrective steps that will be taken to avoid further violations:
Specific training on this event and the mechanisms that can lead to potential water hammer events will be covered in requalification training for licensed operators during June and July. The normal operating procedure for the ESW system has been revised to incorporate the more specific caution statement guidance as well as a specific section for a controlled restoration of flow should it be interrupted during normal operations. Other procedures which could potentially interrupt flow have been reviewed and caution statements will be added to those procedures to refer personnel to the normal operating procedure whenever flow is interrupted.
Date when full comoliance will be achieved:
The requalification cycle training and procedure revisions will be complete by August 1,1993.
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