ML19332A469
| ML19332A469 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 08/19/1980 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Draper E GULF STATES UTILITIES CO. |
| References | |
| NUDOCS 8009160032 | |
| Download: ML19332A469 (1) | |
Text
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.,00 UNITED STATES y 7, v. ( [,g NUCLEAR REGULATORY COMMISSION
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REGION IV
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611 RYAN PLAZA DRIVE, SUITE 1000 ARUPJGTON, TEXAS 76012 g
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August 19, 1980 In Reply Refer To:
RIV Docket Nos.
50-458/IE Information Notice No. 80-30 50-459/IE Information Notice No. 80-30 Gulf States 'tilities Attn:
Dr. E. Linn Draper, Jr.
Vice President - Technology Post Office Box 2951 Beaumont, Texas 77704 Gentlemen:
This IE Information Notice is provided as an early notification of a pdssibly significant matter.
It is expected that recipients will review the informa-tion 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 specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely, 1
eyfrit Director
Enclosures:
1.
IE Information Notice No. 80-30 2.
Recently Issued IE Information Notices 8000160 C>p 1
SSINS No.:6870 Accession No.:
8006190057 IN 80-30 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Information Notice No. 80-30 Date:
August 19, 1980 POTENTIAL FOR UNACCEPTABLE INTERACTION BETWEEN THE CONTROL ROD DRIVE SCRAM FUNCTION AND NON-ESSENTIAL CONTROL AIR AT CERTAIN GE BWR FACILITIES Description of Circumstances:
i 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 Iinction at certain facilities which have relatively poor com=unica-tion betwern the scram discharge volume (SDV) and the scram discharge instru-mented volcme (SDIV) such that the SDIV drair more rapidly than the SDV drain rate into the SDIV.
The significance of such a single failure wa rants transmission of an interim assesse.ent by the NRC Of fice for Analysis ato ' valuation of Operational Data as an early notification of a possibly signit a int matter that is still under review by the NRC staff.
It is expected that r ipients will re. view the inforraation for possible applicability to their f acility.
No s!ecific action or response is requested at this time.
If you have any questio s 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 3o0(o\\9 bo69 No. of s:
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