ML20133N931
| ML20133N931 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, Callaway, 05000000 |
| Issue date: | 09/28/1984 |
| From: | Seiken S, Selken S STANDARDIZED NUCLEAR UNIT POWER PLANT SYSTEM |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| SDR-83-08, SDR-83-8, SLNRC-84-117, NUDOCS 8508140059 | |
| Download: ML20133N931 (2) | |
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suuees Standardized Nuclear Unit OCT - 91984 Power Plant System 5 Choke Cherry Road ih Rockville, Maryland 20850 September 28, 1984 SLNRC 84-117 FILE: 0491.10.2 SUBJ: Final Significant Westinghouse 7300 Process Protection System (SDR 83-08)
Mr. John T. Collins l
Regional Administrator, Region IV U.S. Nuclear Regulatory Commission
(
Suite 1000, Parkway Central Plaza i
Arlington, Texas 76012 1
Docket No. STN 50-482 Ref. 1. SLNRC 84-0007, 1/24/84: Interim Report, Same Subject
- 2. ULNRC-808. S/1/84: Final Report for Callaway, Same Subject
Dear Mr. Collins:
Reference 1 provided an interim report regarding the seismic chatter of the NTC card relay used in the Westinghouse 7300 Process Protection System. The interim report indicated that a suitable replacement relay I
for this NTC card had not been developed by Westinghouse, and that the Callaway Plant would have the relay bypassed via a jumper wire. The use of NTC cards with the bypassed relay eliminates the possibility of any adverse effects from seismic chatter of the bypassed relays.
Union Electric reported in Reference 2 that the bypass modification is considered a workable, permanent solution and confirmed that its imple-mentation would not compromise plant safety.
This letter is to notify the NRC that the bypass modification will be installed at Wolf Creek and, as is the case for Callaway, the bypass is considered a workable, permanent solution for Wolf Creek, without ceed for further enhancement.
It is SNUPPS understanding that, although Westinghouse continues to pursue an alternate solution involving development of a single replace-ment NTC card, the ultimate success of that work is uncertain at this time.
In any event, should Westinghouse development efforts produce an enhanced alternative NTC card, the use of any such alternative will be at Union Electric's and Kansas Gas and Electric's op*'on.
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SLNRC 84-117 Page Two 1
This letter should be considered the final report regarding this subject.
Please call the undersigned or Bob White the SNUPPS Staff should further information be required.
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Very truly yours, S. J. Seiken 4
QA Manager l
RPW/dck/15a18 t
I cc:
G. L. Koester KGE l
J. ti. Evans KCPL H. Bundy NRC/WC R. C. DeYoung NRC/IE: HQ W. L. Forney NRC/IE: III D. R. Hunter NRC/IE: IV l
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