ML19323G194
| ML19323G194 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 05/05/1980 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Clayton L ALABAMA POWER CO. |
| References | |
| NUDOCS 8005300537 | |
| Download: ML19323G194 (4) | |
Text
TERA o
UNITED STATES y
g 3
NUCLEAR REGULATORY COMMISSION o
5
- E WASHINGTON, D. C. 20555
/
May 05,1980 Docket Nos. 50-364 Mr. L. F. Clayton, Jr.
Senior Vice President Alabama Power Co@any P. O. Box 2641 Birmingham, Alabama 35291
Dear Mr. Clayton:
SUBJ ECT:
SEPARATION OF ELECTRICAL EQUIPMENT AND SYSTEMS AT NUCLEAR POWER PLANTS We would like to advise you of a letter (Enclosure 1) dated August 16, 1979 to the Office of Inspection and Enforcement from the Washington Public Power Supply System (WPPSS).
In that letter WPPSS advised us that a review of the equipment and systems installed in the control room of the WPPSS Nuclear Project No. 2 uncovered over 150 instances of violations of separation criteria.
In view of the large number of violations cited in the WPPSS letter for the control room, and the apparent ease with which they occur anywhere in the plant, we require that you conduct a plant-wide field audit of your installed electrical. equipment and systems to determine conformance with your stated criteria. specifies the procedures to be used for conducting an electrical separation field audit at your facility.
In audits performed at other facilities, we noted two major discrepancies:
(1) the auditors included personnel who had performed the initial design and installation, and (2) the review concentrated on Class IE circuits to the exclusion of associated circuits.
Please pay particular attention to these two areas.
j l
Within fifteen days of receipt of this letter, please advise us of your intent to comply with our requirements as specified in Enclosure 2.
Sincerely, tbM&
\\
A. Schwencer, Chief Licensing Branch No. 2 Division of Licensing
Enclosures:
1 As stated l
cc:
See next page 80053005 97
-c-Mr. F. L. Clayton, Jr.
cc:
Mr. Alan R. Barton Executive Vice President Alabama Power Company Post Office Box 2641 Birmingham, Alabama 35291 Mr. Ruble A, Thomas Vice President Southern Company Services, Inc.
Post Office Box 2625 Birmingham, Alabama 35202 Mr. George F. Trowbridge Shaw, Pittman, Potts and Trowbridge 1800 M Street, N. W.
Washington, D. C.
20036 O
WPPSS NUCLEAR PROJECT NO. 2 REPORTABLE DEFICIENCY AND CORRECTIVE ACTION PLANT ELECTRICAL SEPARATION WASHINGTON PUBLIC POWER SUPPLY SYSTEM DOCKET NO. 50-397 LICENSE NO. CPPR-93 Descriotion of Deficiency To date the Plant Main Control Room has been reviewed and approxinately 150 instances have been discovered involving violations in the appli-cation of WNP-2 Electrical Separation Criteria to safety related cables and panel wiring.
In general, the deficiencies involved incorrect label-ing, routing, termination, or power source of safety related cabling within PGCC or Control Room Panels.
Examples of deficiencies found are as follows:
1.
Division 3 HPCS instrumentation powered from a Division 1 source; 2.
Division 3 HPCS cables routed in Division 1 PGCC ducts and Division 1 cable trays in the cable spreading roosh Safety Imolication The deficiencies found to date could have resulted, under single failure conditions, in the simultaneous loss of redundant safety related equip-ment with possible subsequent loss of safety function.
Corrective Action A task force is currently reviewing the Main Control Room and plant areas for other violations of WNP-2 Separation Criteria in all safety related applications.
The WNP-2 Separation Criteria has been refined and clarified and is being used by the Separation Task force as criteria by which to judge plant separation as designed and installed.
This same criteria will be submit-ted in an FSAR amendment.
All instances of deficiencies identified as criteria violations will be evaluated and corrected via Project Engineering Directives (PED's) to the appropriate contractor.
The task force is working tc an action plan which to date has resulted in the completion of the Main Control Room review and identification of de-ficiencies as described above.
The remainder of the review which includes such things as MCC's, Local Panels, etc., is scheduled to be complete by Octcher of 1979.
Note that engoing reviews will be conducted as warranted by construction completien.
ENCLOSURE 2 SEPARATION FIELD AUDfT You are requested to perform a detailed field audit of installed electric equipment and systems to determine conformance to the crit'eria relating to the separation of electric equipment and systems to which you have committed in your FSAR, (e.g., Regulation Guide 1.75 and 1.120)
This audit should include a saaple not less than 10% of the installed' equipment and cables, and should emphasize, but not necessarily be limited to:
a)
Separation of redundant Class IE equipment (e.g., montors, valve operators,
~
instruments).
b)
Separation of redundant Class IE cables.
c) Separation of associated circuits.
d)
Identification (marking) of redundant Class IE equipment and cables.
e)
Identification (marking) of associated circuits to a level indicative of the Class IE system with which they are associated.
f) Separation of redundant wiring, indicators and controls at panels and control boards.
The audit should be performed by engineering and supporting technical personnel who understand the criteria, standards and guides relating to the separation of electrical equipment and systens, and who were not involved in the design and installation of the equipment and systecs ander audit.
The results of this audit should be reported to NRC, with a discussion of any l
l corrective actions taken and any additional audit to be conducted in the event numerous violations are uncovered.