WM 09-0045, Revision to Reply to Notice of Violation EA-09-110

Revision to Reply to Notice of Violation EA-09-110

ML092190309
Person / Time
Site:	Wolf Creek
Issue date:	07/31/2009
From:	Muench R Wolf Creek
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
EA-09-110, WM 09-0045
Download: ML092190309 (2)

Text

FCREEK

'NUCLEAR OPERATING CORPORATION July 31, 2009 Richard A. Muench President and Chief Executive Officer WM 09-0045 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

Reference:

Letter WM 09-0040, dated June 12, 2009, from, R. A. Muench, WCNOC, to USNRC

Subject:

Docket No. 50-482: Revision to Reply to Notice of Violation EA 110 Gentlemen:

The reference provided Wolf Creek Nuclear Operating Corporation's (WCNOC) reply to Notice of Violation (NOV) EA-09-110 concerning events discussed in Inspection Report 05000482/2009002. Specifically, WCNOC was issued a violation for the failure to identify and correct inappropriate closure of the reactor coolant pump thermal barrier heat exchanger valves, inappropriate closure of the downstream component cooling water containment isolation valves, and inappropriate circuit breakers opening associated with the above thermal barrier valves. Subsequent to the submittal of the reference WCNOC discovered additional closures of the thermal barrier valves.

In the attachment, in the paragraph titled "Corrective steps that have been taken and results achieved," WCNOC made the statement that "This has been successful to date in preventing recurrence." The actions specified were taken and the inappropriate opening of the circuit breakers has been avoided. However, the thermal barrier valves were found to have closed as designed during high flow conditions when swapping trains.

jj P.O. Box 411 / Burlington, KS 66839 / Phone: (620) 364-8831 An Equal Opportunity Employer M/F/HCNET

WM 09-0045 Page 2 of 2 WCNOC wishes to replace the original paragraph with the following:

Corrective steps that have been taken and results achieved The corrective actions taken to address the inadequate evaluation and corrective action program deficiencies that contributed to this issue are being addressed by the actions being taken from the Problem Identification & Resolution (PI&R)

Initiative that is addressing WCNOC's PI&R substantive crosscutting issue (Reference 2).

Actions that have been taken to correct the design deficiency in the flow loop and motor control circuitry are 1) Procedure SYS EG-205, "CCW to RCP Flow Adjustment," has been revised to include optimization of component cooling water (CCW) flow to the thermal barriers. The "D" RCP thermal barrier flow balance was optimized per WO 08-311647-000 and signed as complete on January 7, 2009. This procedure revision will assist in avoiding operating near the high-end of our operating band in an effort to minimize the probability of the valves closing during the CCW flow train swaps, and 2) configuration change package (CCP) 012956 has been issued to install an appropriate time delay relay on the control circuitry for the thermal barrier isolation valves to prevent the sudden reversal of motor actuator direction on sensed high flow. This will minimize the possibility that isolation valve breaker will trip and allow more time for flow to stabilize to assist in preventing unnecessary valve closures.

This revised paragraph was written in the context of the original submittal. WCNOC would like to add that since the submittal of the reference CCP 012956 has been implemented with the time delay relays installed. All other intended actions and committed dates remain as originally documented. WCNOC regrets any inconvenience this may have caused.

This letter contains no new commitments. All committed actions and dates remain as originally stated. If you have any questions concerning this matter, please contact me at (620) 364-4000, or Mr. Richard D. Flannigan at (620) 364-4117.

Sincerely, Richard A. Muench RAM/rlt cc: E. E. Collins (NRC)

V. G. Gaddy (NRC)

B. K. Singal (NRC)

Senior Resident Inspector