ML20077K725
| ML20077K725 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 01/17/1990 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-003, IEB-89-3, ULNRC-2140, NUDOCS 9108090070 | |
| Download: ML20077K725 (5) | |
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4 N70N January 17, 1990 LECTRiC 33 U.S. Nuclear' Regulatory Commission.
Attn:
Document Control Desk Mail Station F1-137 Washington D.C.
20555 Gentlemen:
ULNRC-2140 DOCKET NUMBER 50-483 CALLAWAY PLANT POTENTIAL LOSS _OF REQUIRED SHUTDOWN MARGIN DURING REFUELING OPERATIONS
Reference:
NRC Bulletin No. 89-03,-dated November 21,-1989.
This letter.provides_the requested response to
'NRC Bulletin No. 89-03, concerning potential loss of required shutdown margin during refueling operations.
1)
Bulletin 89-03 requested that any inter -
L mediate fuel assembly configuration.to be L
used-during refueling is identified ar.d evaluated to maintsin sufficient refueling boron concentration to result in a minimum shutdown margin of-approximately 5%.
Response: -Westinghouse has provided-guidelines which will assure that the required shutdown margin during-refueling-(Keff 1 95) is. maintained.
These guide-lines are applicable for'a maximum enrichment limit _of 4.5 w/o U-235.
This
. envelopes expected enrichmento at l
Callaway.
!b 2 )-
Bulletin-89-03 requested that plants assure that fuel loading procedures'enly-allow those intermediate fuel. assembly L-configurations..that do not violate the allowable shutdown margin and that these procedures.are strictly adhered to.
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Response
The Westinghouse guidelines are incorporated into Callaway procedure ETP-ZZ-00035, Refueling Performance.
This procedure currently requires that fuel assemblies stored temporarily be stored in the baffle at least 1 fuel assembly away from any other fuel assembly, and at least 2 fuel assemblies away from any cluster of fuel assemblies.
The plant staff strictly adheres to this procedure.
3)
Bulletin 89-03 requested that the staff responsible for refuelici operations is trained in the procedures recommended in Item 2 above and understand the potential consequences of violating these procedures.
This training should include the fundamental aspects of criticality control with higher enriched fuel assemblies.
Response
Prior to refueling operations, the staff responsible for refueling is trained in refueling performance procedures through' courses:
Outage Training (T68.1200.6) and Operator Requalification (T61.0810.8).
If there are any questions concerning this matter,.please contact me.
Very truly yours, h
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Donald F.
Schnell JMC/dvd l'
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4 STATE OF MISSOU SS CITY OF ST. LOUIS 1 Donald F.
Schnell, of lawful age, being first duly sworn upon oath says that he is Senior Vice President-Nuclear and an officer of Union Electric Company; that he has read the foregoing document and knows the content thereof; that he has executed the same for and on behalf of said company with full power and authority to do so; and that the facts therein stated are true and correct to the best of his knowledge, information and belief.
By NEA-Donald F.
Schnell Senior Vice President Nuclear BED and sworn to before me this _
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BARSMA PFAF NOTARY PUGUC. STATE OF MIS;0VR!
MY COMMISSION EXPIRES APRll 22, ;393 ST. LOUIS COUNN wn
cci Corald Charnoff, Esq.
Shaw, Pittman, Potts & Trowbridge 2300 N. Street, N.W.
Washington, D.C.
20037 Dr.
J.-O.
Cermak CFA. Inc.
4 Professional Drive (Suite 110)
Gaithersburg, MD 20879 R.
C. Knop Chief, Reactor Project Branch 1 U.S.
Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Bruce Little Callaway Resident Office
-U.S.
Nuclear Regulatory Commission RR#1 Steedmam, Missouri 65077 D Tom Alexion (2)--
Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 1 White Flint. North, Mail Stop 13E21 11555 Rockville Pike Rockville, MD 20052 Manager, Electric Department Missouri Public Cervice Commission P.O. Bcx 360 Jefferson City, MO 65102
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/QA Record (CA-758)
Nuclear Date E210.01 DFS/ Chrono D.
F. Schnell-J.
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Birk J. V. Laux M.- A. Stiller G.
L. Randolph R. J.
Irwin H. Wuertenbaecher W.
R. Campbell A. C.
Passwater
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P. Wendling D.
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Shafer D.
J.
Walker O.
Maynard (WCNOC)
N..P. Goel (Bechtel)
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Sharkey NSRB (Sandra Auston) l I'
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