ML20117M339
| ML20117M339 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 06/10/1996 |
| From: | Shell R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-93-04, GL-93-4, NUDOCS 9606180418 | |
| Download: ML20117M339 (3) | |
Text
En Temessee Vaney Authonty. Post office Box 2000. Soddy Da,sy Tennessee 37379 June 10,1996 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Gentlemen:
In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328 SEQUOYAH NUCLEAR PLANT (SON) - GENERIC LETTER (GL) 93-04, " ROD CONTROL SYSTEM FAILURE AND WITHDRAWAL OF ROD CONTROL CLUSTER ASSEMBLIES,10 CFR 50.54(f)," REVISED RESPONSE
Reference:
TVA letter to NRC dated September 20,1993,"Sequoyah Nuclear Plant (SON) and Watts Bar Nuclear Plant (WBN) - Transmittal of Response To Generic Letter (GL) 93 04 Rod Control System Failure And Withdrawal of Rod Cluster Assemblies" The purpose of this letter is to supplement the existing commitments contained in the referenced letter. The original commitment stated: " SON willimplement a new current order test to be performed during each refueling outage beginning with each unit's Cycle 6 refueling outage." However, Westinghouse Electric Corporation Ce mmercial Atomic Power (WCAP) - 13864, Revision 1-A, Rod Control System Evaluation Program, required one of two additional periodic tests to support the modification to the rod control system. Approval of the additional periodic test is contained in the NRC safety evaluation report (SER) pertaining to the above subject dated November 10,1994 (TAC No. M88305). The NRC SER discussed three surveillance tests recommended by the Westinghouse Owners Group (WOG). The three tests discussed were: (A) a slave cycle current order test, (B) a power cabinet V reference test, and (C) a coil current test. The WOG recommended that utilities perform either Tests A and C, or Tests B and C. In accordance with the above reference, SON has a procedure in place to perform Test C as previously committed.
TVA will revise the existing procedure or create a new procedure to include Test A (slave cycle current order test). This commitment will supplement the one previously provided in the above reference and will be completed February 15,1997. This is prior to the next required performance during the Unit 1 Cycle 8 refueling outage, which is presently scheduled to begin in March 1997.
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U.S. Nuclear Regulatory Commission Page 2 June 10,1996 It should be pointed out, that as part of each unit's modification of the rod control system that took place during the Cycle 7 refueling outages, both the coil and the slave cycle current order tests are performed during the postmodification process.
Thus, the supplemented commitment will ensure that the slave cycle current order test is performed during each unit's refueling outage. The supplemental commitment is contained in the enclosure.
Note that this issue was originally identified during an NRC inspection as d;scussed in SON NRC Inspection Report No. 327-328/96-01. Please direct questions concerning this issue to Bill Ludwig at (423) 843-7460.
Sincerely, R. R. Jhd R. H. Shell Manager SON Site Licensing Sworn tgI day ofand subscribeq before me h's _/O
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7 My Commission Expires h Enclosure cc (Enclosure):
Mr. R. W. Hernan, Project Manager Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 Regional Administrator U.S. Nuclear Regulatory Commission j
Region 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711
ENCLOSURE
- COMMITMENT TVA will revise the existing procedure or create a new procedure to perform a slave cycle current order test each refueling outage. This commitment will be completed by ;
February 15,1997.
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