ML19332A438
| ML19332A438 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 08/20/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Dewitt R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8009150454 | |
| Download: ML19332A438 (1) | |
Text
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'o UNITED STATES NUCLEAR REGULATORY COMMISSION
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799 ROOSEVELT ROAD o,
GLEN ELLYN, ILLINOIS 60137
%.....o AUG 2 0. E00' Docket No. 50-155 Consumers Power Company ATTN:
Mr. R. B. DeWitt Vice President Nuclear Operations 212 West Michigan Avenue Jackson, MI 49201 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 regnested at this time. If further NRC evaluations so indicate, an IE Circular or Bulletin will be irsued to recommend or request licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely,
$/t1 k ames G. Keppler Director i
Enclosure:
IE Information Notice No. 80-30 1
cc w/ encl:
Mr. D. P. Hof fman, Nuclear Licensing Administrator Mr. C. J. Hartman, Plant Superintendent Central Files Director NRR/DPM Director NRR/ DOR AEOD Resident Inspector, RIII PDR Local PDR NSIC TIC Ronald Callen, Michigan Public Service Commission 8009150 pfy 9
+
SSINS No.:6870 Accession No.:
8006190057 IN 80-30 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT l
WASHINGTON, D.C.
20555 l
August 19, 1980 j
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 j
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 scra... 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 i'nformation for possible appiicability to their facility.
No specific action 1
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
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i DUPLICATE DOCUMENT Entire document previously entered into system under:
ANO 3co(,\\9 0067 No. of pages:
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