ML20008F739
| ML20008F739 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 04/16/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Mcgaughy J MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 8104210627 | |
| Download: ML20008F739 (3) | |
Text
.
- p '**%c ss UNITED STATES 3 d,, [3'i NUCLEAR REGULATORY COMMISSION
,zt WASHINGTON, D. C. 20555 V".C/]l q-a...
e WR \\ 6 1981 I
A O '9 (f 7
Docket Nos.: 50-416/417 f
87 C
A f6 Mr. J. P. McGaughy
.. % 4 Assistant Vice President - Nuclear Production D c%g Mississippi Power & Light Company P. O. Box 16/4 Jackson, Mississippi 39205
Dear Mr. McGaughy:
SUBJECT:
CONTROL SYSTEM FAILURES - GRAND GULF NUCLEAR STATION, UNITS 1 AND 2 The analyses reported in Chapter 15 of the FSAR are intended to demonstrate the adequacy of safety systems in mitigating anticipated operational occurrences and accidents.
Based on the conservative assumptions made in defining these " design bases" events and the detailed review of the analyses by the staff, it is likely that they adequately bound the consequences of single control system failures.
To provide assurance that the design basis event analyses adequately bound other more fundamental credible failures, you are requested to provide the information delineated in the enclosure within 45 days of the date of this letter. Should you have any questions, contact our Licensing Project Pbnager, Joseph A. Martore.
Sincerely, d4W s
Robert L. Tedesco, Assistant Director for Licensing Division of Licensing
Enclosure:
As stated cc: See next page.
e e
l'r. J. P. McGaughy Assistant Vice President - fluclear Production Mississippi Power & Light Company P. O. Box 1640 Jackson, Mississippi 39205 Robert B. McGehee, Esq.
cc:
Wise, Carter, Child, Steen & Caraway P. O. Box 651 Jackson, Mississippi 39205 Troy B. Conner, Jr., Esq.
Conner, Moore & Corber 1747 Pennsylvania Avenue, N. W.
Washington, D. C.
20006 Mr. Adrian Zaccaria, Project Engineer Grand Gulf Nuclear Station Bechtel Power Corporation Gaithersburg, Maryland 20760 Mr. Alan G. Wagner, Resident Inspector Route 2 Box 150 Port Gibson, Mississippi 39150 Mr. N. L. Stampley, Sr. Vice President Engineering, Production & Construction P.O. Box 1640 l
Jackson, Mississippi 39205 Mr. L. F. Dale Nuclear Project Manager P.O. Box 1640 Jackson, Mississippi 39205 Mr. John Richardson P. O. Box 1640 Jackson, Mississippi 39205 l
I
. _ ~........
a I
ENCLOSURE REQUEST FOR ADDITICNAL INFORMATION (1) Identify those control systems whose failure or malfunction could seriously impact plant safety.
(2) Indicate which, if any, of the control systems identified in (1) receive power from common power sources. The power sources considered should include all power sources whose failure or malfunction could lead to failure or malfunction of more than one control systa and should extend to the effects of cascading power losses due to the failure of higher level distribution panels and load centers.
(3) Indicate which, if any, of the control systems identified in (1) receive input signals from common sensors. The sensors considered o
should include, but should not necessarily be limited to, common hydraulic headers or impulse lines feeding pressure, temperature, level or other signals to two or more control systems.
(4) Provide justification that any simultaneous malfunctions of the control systems identified in (2) and (3) resulting from failures or mal-functions of the applicable conrnon power source or sensor are bounded by the analyses in Chapter 15 and would not require action or response beyond the capability of operators or' safety sys'. ems.
4
- G l
\\
4-
- PM
- WSg 7 T fg7,-' -.
N
~, - -
,n v-.n,
. -..-