ML19209B949
| ML19209B949 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 09/14/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Parris H TENNESSEE VALLEY AUTHORITY |
| References | |
| NUDOCS 7910110268 | |
| Download: ML19209B949 (1) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION o
y e REGION 11 g
o 101 MARIETTA ST., N.W., SUITE 3100 o
ATLANTA, GEORGIA 30303 In Reply Refer To:
SEP 141973
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Tennessee Valley Authority Attn:
H.G. Parris Manager or Power 500A Chestnut Street Tower II Chattanooga, Tennessee 37401 Gentlemen:
The enclosed Information Notice provides information with regard to a potential unreviewed safety question involving high energy lines and control systems.
Sincerely,
'/
Ja s P. O'Re y
Director
Enclosures:
- 2. List of IE Information Notices Issued in the Last Six Months k
113i 123 7910110268
Tennessee Valley Authority Septemb er 14, 1979 cc w/ encl:
H.L. Abercrombie Plant Superintendent Post Office Box 2000 Decatur, Alabama 35602 D.E. McCloud, Project Engineer 400 Chestnut Street Tower II Chattanooga, Tennessee 37401 1131 124
24 Accession No: 79082201Et 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 notified 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 systems to determine whether any unreviewed safety questions exist.
This Infcanation 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 so 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.
1131 125
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IE Information Notice No. 79-22 Enclosure September 17, 1979 Page 1 of 2 LISTING OF IE INFORMATION NOTICES ISSUED IN LAST SIX MONTHS Information Subject Date Issued To Notice No.
Issued 79-22 Qualification of Control 9/17/79 All Holders of cps Systems 9/14/79 All Holders of OLs 79-21 Transportation and Commer-9/11/79 All Licensees as Supple-cial Burial of Radioactive mental Information to Materials IE Bulletin Nos. 79-19
& 79-20 79-20 NRC Enforcement Policy 9/7/79 All Holders of Reactor (Rev. 1)
NRC Licensed Individuals OLs and cps and Production Licensees with Licensed Operators 79-20 NRC Enforcement Policy 8/14/79 All Holders of Reactor NRC Licensed Individuals OLs and cps and Production Licensees with Licensed Operators 79-19 Pipe Cracks in Stagnant 7/18/79 All Holders of Reactor (Correction - Borated Water Systems at OLs and cps Enclosure)
PWR Plants 79--19 Pipe Cracks In Stagnant 7/17/79 All Holders of Reactor Borated Water Systems At OLs and cps PWR Plants 79-13 Skylab Reentry 7/6/79 All Holders of Reactor OLs 79-17 Source Holder Assembly Damage 6/20/79 All Holders of Reactor Damage From Misfit Between OLs and cps Assembly and Reactor Upper Grid Plate 79 16 Nuclear Incident at Three 6/22/79 All Research Reactors Mile Island and Test Reactors with OLs 79-15 Deficient Procedures 6/7/79 All Holders of Reactor OLs and cps 79-14 NRC Position of Electrical 6/11/79 All Power Reactor Cable Support Systems Facilities with a CP e
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h av ev IE Information Notice No. 79-22 Enclosure September 17, 1979 Page 2 of 2 LISTING OF INFORMATION NOTICES ISSUED IN LAST SIX MONTHS Infonnation Subject Date Issued To Notice No.
Issued 79-13 Indication of Low Water 5/29/79 All Holders of Reactor Level in the Oyster Creek OLs and cps Reactor 79-12 Attempted Damage to New 5/10/79 All Fuel Facilities Fuel Assemblies Research Reactors, and Power Reactors with an OL or CP 79-11 Lower Reactor Vessel head 5/7/79 All holders of Reactor Insulation Support Problem OLs and cps 79-10 Nonconforming Pipe 4/16/79 All power reactor Support Struts facilities with a CP jl