ML20129J599
| ML20129J599 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 09/22/1994 |
| From: | Terry C TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-93-04, GL-93-4, TXX-94243, NUDOCS 9611070047 | |
| Download: ML20129J599 (2) | |
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Log # TXX-94243 I
File # 10035 l
5 Ref. # GL 93-04 l
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TUELECTRIC September 22, 1994 C. Imace Terry i
Groep Yke PresMrnt i
U. S. Nuclear Regulatory Commission Attn:
Document Control Desk 4
l Washington, DC 20555 i
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) l I
DOCKET NOS. 50-445 AND 50-446 IMPLEMENTATION SCHEDULE FOR R00 CONTROL 4
SYSTEM CHANGES 1
I REF:
1)
Generic Letter 93-04, " Rod Control System Failure and Withdrawal of Rod Control Cluster Assemblies,"
dated June 21, 1993 2)
TV Electric letter logged TXX-93287 from William J. Cahill, Jr. to NRC dated August 5, 1993 3)
TU Electric letter logged TXX-93326 from William.1. Cahill, Jr. to NRC dated September 30, 1993 Gentlemen:
On June 21, 1993, the NRC issued Generic Letter 93-04, " Rod Control System Failure and Withdrawal of Rod Control Cluster Assemblies." In response to this Generic Letter and as a long term enhancement, TV Electric committed to implement a new current order surveillance and a new current order timing in the rod control system for each unit by the first refueling outage after January 1,1994. By this letter, TU Electric advises that the current order surveillance and current order timing for Unit 2 will be implemented during 2RF01 scheduled for October,1994. Unit 1 however, will not implement the current order surveillance and current order timing until 1RF04 scheduled for the Spring of 1995.
TV Electric's response to Generic Letter 93-04 was provided in two parts.
The first part, provided by letter, logged TXX-93287 dated August 5, 1993, from William J. Cahill, Jr. to NRC, and contained a summary of the compensatory actions taken by TV Electric in response to the Salem rod control system failure event. The letter also provided a summary of the results of the generic safety analysis program conducted by the Westinghouse Owners Group and its applicability to Comanche Peak. The second part was provided by letter logged TXX-93326 dated September 20, 1993, from William J. Cahill, Jr. to NRC.
TXX-93326 provided an assessment of whether the licensing basis for Comanche Peak was satisfied, with regard to the requirements for system response to a single failure in the rod control system and provided supporting discussion for this assessment in light of the information generated as a result of the Salem event.
PDR ADOCK 05000445 f\\D
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- TXX-94243 Page 2 Of 2 In the attachment to TXX-93326, TV Electric stated that while the licensing basis was being met TV Electric would implement a new current order surveillance (such as current order traces from each group following each refueling outage) to ensure detectability and modify the Rod Control System current order timing to prevent any uncontrolled asymmetric rod withdrawal in the event of a failure similar to that identified at Salem.
The commitment to implement the new current order surveillance and modify the Rod Control System during the first refueling outage after January 1,1994, was contingent on the successful demonstration of the timing adjustments at an operating plant by Westinghouse and receipt of the official technical bulletin from Westinghouse.
The commitment implies that the current order timing would be implemented in 1994.
In fact. 1RF04 scheduled for the spring of 1995 is the next Unit I refueling outage.
If you have any questions please contact Jose' O. Rodriguez at (214) 812-8674.
Sincerely, C. L. Terry, By:
D. R. Woodlan Docket Licensing Manager JDR/grp c-Mr. L. J. Callan, Region IV Resident Inspectors, CPSES (2)
Mr. T. A. Bergman, NRR l
Mr. D. D. Chamberlain, Region IV