ML19209B954
| ML19209B954 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 09/17/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7910110282 | |
| Download: ML19209B954 (1) | |
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION gg o
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,a REGION il O
101 MARIETTA ST., N.W., SUITE 3100 ATLANTA, GEORGIA 30303 4,.....,o SEP 171979 In Reply Refer To:
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-50:339, 50-404?,
k 50-405 Virginia Electric and Power Company Attn:
W. L. Proffitt Senior Vice President, Power Post Office Box 26666 Richmond, Virginia 23261 Gentlemen:
The enclosed Information Notice provides information with regard to a potential unreviewed safety question involving high energy lines and control syste,s.
Sincerely, Jam,es [ H & -
O'Rei y Director
Enclosures:
- 2. List of IE Information Notices Issued in the Last Six Months 9
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1Bli206 7910110282
SEP 171979 Virginfa Electric and Power Company.
cc w/ encl:
W. R. Cartwright, Station Manage-Post Office Box 402 Mineral, Virginia 23117 P. G. Perry Senior Resident Engineer Post Office Box 38 Mineral, Virginia 23117 1131 207
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Accession ho: 7908220112 SSINS: 6870 UNITED STATES NUCLEAR REGULATORY 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 nc,tified the NRC of a potential unreviewed safety question at their Salem Unit 1 facility. This notification was based on a continuing review by Westinghouse of the environmental qualifications of equipment that they supply for nuclear steam supply systems. Based on the present status of this effort, 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 systema to determine whether any unreviewed safety questions exist.
This Information N'..tice is provided as an early notification of a possibly significant matter.
It is expected that recipients will review the informatian for possible applicability to their facilities. No specific action or response is request.d at *.his time.
If NRC evaluationteso indicate, further licensee actions may be requested or required.
If you have questions regarding this matter, please contact the C$ rector of the appror-3-+- UDP hainnal Office.
No written response to this Information 1 k
DUPLICATE DOCUMENT Entire document previously entered into system under:
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