ML19309H780
| ML19309H780 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/28/1980 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Papay L SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| NUDOCS 8005190707 | |
| Download: ML19309H780 (1) | |
Text
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8 005190 W 7 W j
UNITED STATES NUCLEAR REGULATORY COMMISSION o
E REGION V 0,
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'990 N. CALIFORNIA BOULEVAf*D e'*
SUITE 202, WALNUT CREEK PLAZA e,,,e WALNUT CREE K, CALIFORNIA 94596 April 28, ~1980 Docket flos. 50-206, 50-361 & 50-362 Southern California Edison Company P. O. Box 800 2244 Walnut Grove Avenue Rosemead, California 91770 Attention:
Dr. L. T. Papay, Vice President Advanced Engineering Gentlemen:
The enclosed Circular flo. 80-09 is forwarded to you for information. flo written response.is required; however, should you have any questions re-garding the Circular or its recommendations, please contact this office.
Sincerely, lihl % /G ----
R. H. Engelken Director
Enclosures:
1.
IE Circular flo. 80-09 2.
List of IE Circulars Recently Issued cc w/ enclosures:
J. M. Curran, SCE R. Dietch, SCE
J SSINS flo.: 6830 Accession No.:
UNITED STATES 8002280663 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION-AND ENFORCEMENT WASHINGTON, D.C.
20555 i
April 28, 1980 IE Circular No. 80-09 PROBLEMS WITH PLANT INTERNAL COMMUNICATIONS SYSTEMS Description of Circumstances at the Kewaunee Power Plant:
On January 17, 1980, the Kewaunee Nuclear Power Plant lost offsite power to its 4160V non-safeguards buses.
Since the system used for internal communica-tions, paging and evacuation alarm purposes (Gai-tronics) was powered from a non-safeguards bus, plant communications were degraded during the outage.
This degraded condition persisted until power was restored to the affected bus thru an emergency safeguards bus. While in the degraded mode, the licensee used two-way portable radios for internal communications.
The radios performed satisfactorily, per se; however, when transmitting in the vicinity of certain
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electronic equipment, they induced false signals into the electronic equipment.
I Description of Circumstances at the Davis-Besse Powe 3tation:
On'0ctober 15, 1979, the Davis-Besse Power Station lost all offsite power.
During the period when offsite power was not available, the licensee noted that the internal three digit telephones (GTE) would not function.
In addition, the NRC " Red Phone" was subsequently reported to have been out of service.
Other licensee phone systems (Gai-tronics and the outside four digit Ohio Bell phones) did work.
Following tnis event, the licensee provided emergency power to its phones and the NRC took action through AT&T to provide emergency power to all Red Phones.
(Note: Although the communications system at Davis-Besse was not designed to meet the single failure criterion, its FSAR states that the main internal commanications system is supplied by two redundant power feeders from the uninterruptable instrumentation distribution panels.)
RECOMMENDED ACTI0tl FOR LICENSEES AND HOLDERS OF CONSTRUCTION PERMITS All licensees of nuclear power reactors and holders of construction permits should be aware of the potential problems described above.
Because of the generic implications of the above problems, it is recommended that the following actions be considered:
1.
Determine the source of power for plant internal communications systems; 2.
Upgrade the internal communications systems to assure operability during j
the loss of offsite power or other foreseeable events;
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J IE Circular No. 80-09 April 28, 1980 Page 2 of 2 i
3.
Determine whether any plant electror.ic equipment may be adversely affected by portable radio transmissions.
This determination should j
include, but not be limited to, the computer system, ele;tro-hydraulic l
sy3 tem, and nuclear instrumentation system; and
)
4.
Instruct employees on the use of radios in areas susceptible to electro-l magnetic interference.
1 No written response to this Circular is required; however, if additional i
information regarding these matters is required, contact the Director of the j
appropriate NRC Regional Office.
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IE Circular No. 80-09 Enclosure April 28, 1980 RECENTLY ISSUED IE CIRCULARS Circular Subject Date of Issued to No.
Issue l
80-08 BWR Technical Specification 4/18/80 All General Electric i
Inconsistency - RPS Response BWR's holding a power j
Time reactor OL l
80-07 Problems with HPCI Turbine 4/3/80 All holders of a power Oil System reactor OL or CP 80-06 Control and Accountability 4/14/80 Medical licensees in Systems for Implant Therapy.
Categories G and G1 Sources 80-05 Emergency Diesel-Generator 4/1/80 All holders of a power Lubricating Oil Addition and reactor OL or CP Onsite Supply i
I 80-04 Securing of Threaded Locking 3/14/80 All holders of a power Devices on Safety-Related reactor OL or CP
]
Equipment 80-03 Protection from Toxic Gas 3/6/80 All holders of a j
Hazards power reactor OL j
80-02 Nuclear Power Plant Staff 2/1/80 All holders of Reactor I
Work Hours OLs, including research 1
and test reactors, and j
cps 80-01 Service Advice for GE 1/17/80 All licensees of l
Induction Disc Relays nuclear power reactor i
operating facilities and holders of nuclear power reactor cps l
79-25 Shock Arrestor Strut 12/20/79 All licensees and Assembly Interference holders of power reactor cps 79-24 Proper Installation and 11/26/79 All Holders of e Calibration of Core Spray Power Reactor OL or Pipe Break Detection CP Equipment on BWRs.
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