ML20235S638
| ML20235S638 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 10/05/1985 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF ADMINISTRATION (ADM) |
| References | |
| ULNRC-1639, NUDOCS 8710090074 | |
| Download: ML20235S638 (4) | |
Text
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1 Etscruic is 1901 Gratiot Street, St, Louis Donald F. Schnell October 5, 1985
< Vice President ;
U.S. anuclear-Regulatory Commission ATTN:
' Document Control Desk Washington, D.C.
20555 Gentlemen:
ULNRC-16 39 DOCKET NUMBER 50-483 CALLAWAY-PLANT AMSAC GENERIC DESIGN PACKAGE
References:
- 1. OG-87-35 dated 18/3/87, WCAP-10858-P-A, Revision 1, "AMSAC Generic Design Package" 2.~OG-87-10 dated 2/26/87, WCAP-10858-P-A, Addendum 1
- 3. ULNRC-147 2 dated 3/19/87
- 4. ULNRC-1492 dated 4/15/87 This correspondence is_ based upon a telephone conversation held on 10/2/87'between NRC, WCNOC,'and UE personnel during which the implications of Reference 1 were discussed.
' Reference 1 revised the AMSAC Generic Design Package to addreas the following:
)
1.
Incorporation of Addendum 1 (Reference 2) which provided the basis for the AMSAC C-20 setpoint (40% power) and I
changed the low feedwater flow setpoint'for Option 2.
i The former is applicable to Callaway Plant, as discussed in References 3 and 4, whereas the latter is not applicable since we are implementing Option 1 based on steam gene rator water level.
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2.
Addition of a variable time delay for Options 2 and 3, described on pages 4-8, 4-9, 5-9, and 5-10 of Reference 1.
This variable timc delay is dependent upon turbine impulse chamber pressure and was added to minimize spurious actuations and to allow the reactor protection system to provide the first trip signal at reduced power i
levels.
This is required only for Options 2 and 3.
Option 1, which is based on a reactor trip variable, does not require this variable time delay as stated in Reference 4.
i 3.
Revision of the C-20 permissive signal delay f rom 120 seconds to 360 seconds.
The Callaway AMSAC design will incorporate this change which allows AMSAC to remain j
armed for 360 seconds to allow time to perform its 1
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. I function in the event of a turbine trip.
This change is
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based on AMSAC signal delays at reduced power levels, as discussed in Reference 1.
Therefore, the only change to the Callaway AMSAC design as a result of Reference 1 is the Increase in the C-20 delay.
The C-20 setpoint at 40% of NSSS thermal power was previously included in our design, as discusced in References 3 and 4.
If you have any further questions, please contact us.
4 i
Very truly yours, I
be eh A Donald Schnell GGY/ lad l
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cc : - Gerald 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 W. L. Forney 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 t
RR91 Steedman, Missouri 65077 Tom Alexion (2)
Office of. Nuclear Reactor Regulation U.S.
Nuclear Regulatory Commission Mail Stop 316 7920' Norfolk Avenue Bethesda, MD 20014 Manager, Elec tric Department Missouri Public Service Commission 1
P.O. Box 360
- i Jefferson City, MO 65102 1
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D. Shafer A160.761
- QA Record (CA-758)
Nuclear Date DFS/ Chrono D.
F.
Schnell J.
E. Birk J. F. McLaughlin A. P. Neuhalfen R. J. Schukai M.
A.
Stiller G.
L. Randolph R.'J.
Irwin H. Wuertenbaccher W. R. Campbell A..C.
Passwater R.
P. Wendling D.
E. Shafer D.
J. Walker O.
Maynard (WCNOC)
R. C. Slovic (Dechtel)
G56.37 (CA-4 60)
Compliance (J. E. Davis)
NSRB (Sandra Auston)
W. B. Bobnar G.
G.
Yate s E 2.0 0. 0 I I
1 1
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