ML19344F587
| ML19344F587 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 08/20/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Gerstner W ILLINOIS POWER CO. |
| References | |
| NUDOCS 8009150483 | |
| Download: ML19344F587 (1) | |
Text
+ps** *C%'o,,
fl(
UNITED STATES
'8 NUCLEAR REGULATORY COMMISSION o
REGION ll1 e
e 799 ROOSEVELT ROAD g
GLEN ELi.YN, ILLINOIS 60137 AUG 2 0' 980' Docket No. 50-461 Docket No. 50-462 Illinois Power Company ATTN:
Mr. W. C. Gerstner Executive Vice President 500 South 27th Street Decatur, IL 62525 Gentlemen:
This Information Notice No. 80-30 is provided as an early notification of a possibly significant matter.
It is expected that recipients will review the information for possible applicability to their facilities.
No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely, fA41 E.
ames G. Keppler Director
Enclosure:
IE Information Notice No. 80-30 cc w/ encl:
Central Files Director, NRR/DPM Director, NRR/ DOR PD.
Local PDR NSIC TIC Mr. Dean Hansell, Office of Assistant Attorney General Mr. Gary N. Wright, Chief Division of Nuclear Safety
. 8 0091 BG 2
w
_w_.-_.
~
SSINS No.:6870 Accession No.:
8006190057 IN 80-30 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 August 19, 1980 IE Information Notice No. 80-30:
POTENTIAL FOR UNACCEPTABLE INTERACTION BETWEEN THE CONTROL R0D DRIVE SCRAM FUNCTION AND NON-ESSENTIAL CONTROL AIR AT CERTAIN GE BWR FACILITIES Continued NRC evaluation of possible failure modes of the control rod drive system related to the Browns Ferry event (IE Bulletin 80-17), has identified a potentially significant single failure mechanism which could degrade the scram function.
The slow loss of non-essential control air pressure could degrade the scram function at certain facilities which have relatively poor communica-tion between the scram discharge volume (SDV) and the scram discharge instru-mented volume (SDIV) such that the SDIV drains more rapidly than the SDV drain rate into the SDIV.
The significance of such a single failure warrants transmission of an interim assessment by the NRC Office for Analysis and Evaluation of Operational Data as an early notification of a possibly significant matter that is still under review by the NRC staff.
It is expected that recipients will review the information for possible applicability to their facility.
No specific action or response is requested at this time.
If you have any questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
Enclosure:
Memo from C. Michelson to H. Denton, dated August 18, 1980 DUPLICATE DOCUMENT Entire document previously entered into system under:
ANO toc b\\9 C)657 N o.
of pages:
6
-