ML19254C072
| ML19254C072 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 09/17/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stampley N MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 7910110261 | |
| Download: ML19254C072 (1) | |
Text
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UNITED STATES h
8 NUCLEAR REGULATORY COMMISSION o
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REGION 11 o
101 MARIETTA ST., N.W., SUITE 3100 Y4 ATLANTA, G EORGIA 30'M SEP 171979 In Reply Refer To:
RII:JPO=-
(50-416, 50-417 '
Mississippi Power and Light Company Attn:
N. L. Stampley Vice President of Production P. O. Box 1640 Jackson, Mississippi 39205 Gentlemen:
The enclosed Information Notice provides information with regard to a potential unreviewed safety question involving high energy lines and control systems.
Sincerely, 4c".
Jamps ei y Director
Enclosures:
- 2. List of IE Information Notices Issued in the Last Six Months 1157 122 j i
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SEF 17 m79 Mississippi Power and Light Company.
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C. K. McCoy Plant Manager Post Office Box 756 Port Gibson, Mississippi 39150 1131 110 e
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24 Accession No: 79082201Et SSINT:
6870 UNITED STATES NUCLEAR REGUIATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 September 14, 1979 IE Information Notice No. 79-22 QUALIFICATION OF CONTROL SYSTEMS Public Service Electric and Gas Company notified the NRC of a potential unreviewed safety question at their Salen; Unit I facility. This notification was based on a continu.ng review by Westinghouse of de envircamental qualifications of equipment that they supply for nuclear steam supply systems. Based on the present status of this ef.srt, Westinghouse has informed their customers that the performance of non-safety grade equipment subjected to an adverse environment could impact the protective functions performed by safety grade equipment. These non-safety grade systems include:
Steam generator power operated relief valve control system Pressurizer power operated relief valve control system Main feedwater control system Automatic rod control system These systems could potentially malfunction due to a high energy line break inside or outside of containment. NRC is also concerned that the adverse environment could also give erroneous information to the plant operators.
Westinghouse states that the consequences of such an event could possibly be more limiting than results presented in Safety Analysis Reports, however, Westinghouse also states that the severity of the results can be limited by operator actions together with operating characterisitics of the safety systems. Further, Westinghouse has recommended to their customers that they review their systems to determine whether any unreviewed safety questions exist.
This Information Notice 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 NRC evaluations'eso indicate, further licensee actions may be requested or required.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
No written response to this Information Notice is required.
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