Information Notice 1979-22, Qualification of Control Systems
| ML031180167 | |
| Person / Time | |
|---|---|
| Site: | 05000000 |
| Issue date: | 09/14/1979 |
| From: | NRC/IE |
| To: | |
| References | |
| IN-79-022, NUDOCS 7908220124 | |
| Download: ML031180167 (3) | |
Accession No: 790822011 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 albigh 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 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.
.
I
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IE Information Notice No. ; 22
September 14, 1979 LISTING OF IE INFORMATION NOTICES
ISSUED IN LAST SIX MONTHS
Information
Notice No.
Subject
Date
Issued
Issued To
79-05
79-06
79-07
79-08
79-09
79-10
Use of Improper Materials
in Safety-Related Components
Stress Analysis of
Safety-Related Piping
Rupture of Radwaste Tanks
Interconnection of
Contaminated Systems with
Service Air Systems Used
As the Source of Breathing
Air
Spill of Radioactively
Contaminated Resin
Nonconforming Pipe
Support Struts
Lower Reactor Vessel Head
Insulation Support Problem
Attempted Damage to New
Fuel Assemblies
Indication of Low Water
Level in the Oyster Creek
Reactor
NRC Position of Electrical
Cable Support Systems
Deficient Procedures
3/21/79
All power reactor
facilities with an
3/23/79
All Holders of
3/26/79
All power reactor
facilities with an
3/28/79
All power reactor
facilities with an
OL and Pu Processing
fuel facilities
3/30/79
All power reactor
facilities with an
4/16/79
All power reactor
facilities with a
79-11
5/7/79.
.;4.
All holders of Reactor
79-12
79-13
5/11/79
All Fuel Facilities
Research Reactors, and Power Reactors
5/29/79
All Holders of Reactor
6/11/79
All Power Reactor
Facilities with a
79-14
79-15
6/7/79
All Holders of Reactor
I
IE Information Notice No. 79-22
September 14, 1979
LISTING OF IE INFORMATION NOTICES
ISSUED IN 1979 Information
Notice No.
Subject
Date
Issued
Issued To
79-16
79-17
79-18 Nuclear Incident at Three
6/22/79
All Research Reactors
Mile Island
and Test Reactors
with OLs
Source Holder Assembly Damage 6/20/79
All Holders of Reactor
Damage From Misfit Between
Assembly and Reactor Upper
Grid Plate
Skylab Reentry
7/5/79 All
Holders of Reactor
79-19
Pipe Cracks In Stagnant
Borated Water Systems At
PWR Plants
7/17/79 All Holders
of Reactor
79-20
79-21 NRC Enforcement Policy
8/10/7'
NRC Licensed Individuals
Transportation and Commercial 9/7/79
Burial of Radioactive Material
'9 All Holders of Reactor
OLs and CPs and Production
Licensees with Licensed
Operators
All power and research
reactors with OL's
No.