ML20246C345
| ML20246C345 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/18/1989 |
| From: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20246C349 | List: |
| References | |
| TXX-89596, NUDOCS 8908240338 | |
| Download: ML20246C345 (3) | |
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Log # TXX-89596
- """ 7 File # 10130 C
IR 89-30 r
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1UELECTRIC August 18, 1989 EN,N,$,
U. S. Nuclear' Regulatory Commission Attn: Document Control Desk Washington, D. C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 RESPONSE TO NRC INSPECTION REPORT NOS.
50-445/89-30; 50-446/89-30 AUGMENTED INSPECTION TEAM (AIT) INSPECTION OF CHECK VALVE FAILURES REF:
1)
Letter from R. F. Warnick, USNRC, to W. J. Cahill, TU Electric dated July 10, 1989
Reference I requested that TU Electric submit a report summarizing the lessons learned from the Auxiliary Feedwater (AFW) backflow events on April 23 and May 5, 1989 and the corrective actions TU Electric planned to take.
Reference 2 acknowledged the Reference I request and stated a report would be submitted by August 18, 1989.. The report is attached.
As this report discusses, the cause of the backflow events was backflow through hung open Borg-Warner / International Pump Inc. (BW/IP) pressure seal check valves coincident with the failure of Auxiliary Operators to operate valves in the sequence specified by procedures.
In response to these events, TU Electric is taking corrective action for the affected hardware, including inspection and, as necessary, rework of BW/IP check valves at CPSES.
Additionally, TU Electric is taking action to address the cause of the events and prevent recurrence of similar events. These actions include the following:
o The reassembly procedure for the BW/IP check valves has been revised to ensure that the valve disc will properly seat.
o Administrative procedures have been revised to clearly state that the tasks in a procedure are to be performed in the sequence specified unless certain exceptions are satisfied.
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TXX-89596 August 18, 1989 Page 2 of 3 o
Operations personnel are receiving and will continue to receive training in the revised administrative procedures, in the need to comply with procedures in general, and in avoidance of the type of noncompliance with procedures that occurred during the April 23 and May 5 events.
TV Electric has also evaluated the backflow events on April 23 and May 5, the precursors to these events, and the Company's response to these events to determine lessons learned and identify corresponding improvements.
In performing this evaluation, TU Electric also accounted for the conclusions and recommendations of the AIT, together with the weaknesses identified by the NRC at a meeting on the CPSES power ascension program on July 17, 1989.
Based upon its evaluation, TU Electric has concluded that improvements are warranted in four general areas before fuel load. These areas, and the corresponding improvements that TU Electric is making, are discussed below.
The attached report provides a more detailed description of the improvements.
o Manaaement and Supervision of Operations - TU Electric is taking action to expedite the transition from a construction to an operating attitude, to provide Operations with greater control of the project, to improve the reporting of plant events and equipment failures to Operations management and supervision, and to enhance management's awareness of time and manpower needs for specific tasks.
O Corrective Actions and Evaluation of Plant Events and Eauipment Failures - TU Electric is taking action to improve the documentation and reporting of plant events and equipment failures, to increase the aggressiveness and timeliness of investigations of plant events and equipment failures, and to improve future team evaluations by TU Electric.
o Communications Amona Operators and Shifts - TU Electric is taking action to improve communications among operators and communications between shifts.
o Personnel Awareness of Operatina Events and Eauipment Failures ud Their Implications for System Operability - TU Electric is taking action to increase the awareness of Operations personnel concerning Work Requests and their implications for plant operability, and to improve the availability of information regarding plant events and equipment failures to Operations personnel.
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TXX-89596 August 18, 1989 Page 3 of 3 The improvements discussed above are only one part of a larger effort to ensure that TU Electric will be ready to operate CPSES Unit 1.
For example, l
TU Electric has established an Operational Readiness Program _ and management of the transition from construction to operations has been placed under the direction of the Vice President, Nuclear Operations. These and other efforts, together with the improvements discussed in the attached report, will help ensure that TU Electric will be ready to operate upon completion of Unit I construction.
In summary, TU Electric has identified the root causes of the backflow events on April 23 and May 5, 1989, is taking corrective action for these events, including action to address root causes and prevent recurrence'of similar events, and is implementing improvements based on lessons learned.
Consequently, TU Electric believes that it is adequately addressing the events, and that upon completion of the corrective and preventive actions and implementation of referenced improvements, the events should not pose any impediment to the issuance of an operating license for CPSES Unit 1.
Sincerely,
'/.
William J. Cahill, Jr.
TLH:daj c - Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3) l l