ML19343A085
| ML19343A085 | |
| Person / Time | |
|---|---|
| Issue date: | 08/22/1980 |
| From: | Pappas H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Wright G ILLINOIS, STATE OF |
| References | |
| NUDOCS 8009160052 | |
| Download: ML19343A085 (2) | |
Text
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GLEN ELLYN, ILLINOIS 60137
'AUS 2 219801 State of Illinois Department of Public Health ATTN:
Mr. Gary N. Wright, Chief Division of Nuclear Safety 535 West Jefferson Street Springfield, IL 62761 Gentlemen:
The enclosed IE Information Notice 80-30 titled " Potential for Unacceptable Interaction Between the Control Rod Drive Scram Function and Non-essential Control Air at Certain GE BWR Facilities" was sent to the following licensees on August 19, 1980:
Cincinnati Gas & Electric Company Zimmer (50-358)
Cleveland Electric Illuminating Company Perry 1, 2 (50-440, 50-441)
Commonwealth Edison Company Dresden 1, 2, 3 (50-10, 50-237, 50-249)
LaSalle 1, 2 (50-373, 50-374)
Quad-Cities 1, 2 (50-254, 50-265)
Consumers Power Company Big Rock Point (50-155)
Dairyland Power Company LACBWR (50-409)
Detroit Edison Company Fermi 2 (50-341)
Illin'ois Power Company Clinton 1, 2 (50-461, 50-462)
Iowa Electric Light & Power Co.
Duane Arnold (50-331) 8009160 Q@
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State of Illinois.AUG z 2 19801 Northern Indiana Public Service Company Bailly (50-367)
Northern States Power Company Monticello (50-263)
Sincerely, Ak pfW Helen Pappas, Chief Administrative Branch
Enclosure:
IE Information Notice No. 80-30 cc w/ encl:
Mr. D. W. Kane,
Sargent & Lundy Central Files Reproduction Uni' hPC 20b Local PDR NSIC TIC
SSINS No.:6870 Accession No.:
8006190057 IN 80-30 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT hASHINGTON, D.C.
20555 August 19, 1980 IE Information Notica No. 80-30:
POTENTIAL FOR UNACCEPTABLE INTERACTION BETWEEN THE CONTROL ROD 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 j
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 i
DUPLICATE DCCUMENT Entire document previously entered into system under:
ANO 9 0 c c,l 9 O c G -"I No. of pages:
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