ML19345G189
| ML19345G189 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 03/02/1981 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Koester G KANSAS GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8103170010 | |
| Download: ML19345G189 (1) | |
Text
7.Z c UNITED STAVES
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-1 NUCLEAR REGULATORY COMMISSION b'
REGloN IV k,3
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611 RYAN PLAZA DRIVE. SUITE 1000 4,,,, -
ARLINGTON. TEXAS 76011
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March 2, 1981 Docket No.
STN 50-482 Kansas Gas & Electric Co.
ATTN: Mr. Glenn L. Koester Vice President-Nuclear Post Office Box 208 Wichita, Xansas 67201 Gentlemen:
The enclosed IE Circular is forwarded for your information. No written response to this circular is required.
If you have any questions related to this matter, please contact this office.
Sincerely, foYW / $Yrj Karl V. Seyfrit Director
Enclosures:
1.
IE Circular No. 81-03 2.
List of Recently Issued IE Circulars cc: w/ enclosures Messrs. Nicholas A. Petrick, SNUPPS D. T. McPhee, Kansas City Power and Light Company Gerald Charnoff, Shaw, Pittman, Potts & Trowbridge E. W. Creel, Kansas Gas and Electric Company E
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SSINS No.: 6830 Accession No.:
8008220271 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Circular No. 81-03 March 2, 1981 Page 1 of 3 INOPERABLE SEISMIC MONITORING INSTRUMENTATION Description of Circumstances:
On November 8, 1980, an earthquake occurred off the coast aear Eureka, California.
The earthquake was reported to have a magnitude of 7.0 on the Richter Scale at the epicenter, approximately 25 to 75 miles from the Humboldt Bay Power Plant facility.
There were 12 separate seismic events above a magnitude of 3.5 that occurred within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the earthquake, the largest event measuring 5.2.
Reported damage to structures included several houses that were moved off supporting posts, various chimneys that were knocked down, one highway overpass that collapsed, and unspecified damage that occurred at two pulp mills.
There were three potentially different sources of plant response data: three sets of magnetic tape triaxial accelograph recorders; three sets of triaxial film recorders (passive device); and one set of triaxial response spectrum recorders (passive device).
A review of the records from these instruments indicated the following: the magnetic tape triaxial recorders did not produce useful records due to i degraced low-voltage power supply in the recording system (previously scheduled for routine sarvicing one week after the earthquake);
a buildup of dirt and dust appeared to make inoperable six of the nine film recorders (the readings from the other three are considered highly unreliable and were not obtained from the same set of triaxial recorders); the triaxial response spectrum recorder was the only instrument believed to produce reliable data.
On January 24, 1980, an earthquake measuring 5.5 on the Richter Scale occurreo about 10 miles north of Lawrence Livermore Laboratory (near San Francisco, California).
Numerous aftershocks also occurred with one measuring 5.2 on l
January 26.
The damage to civil structures was considered minor.
Rancho Seco Nuclear Plant, located approximately 45 miles northeast of the earth-i quake area, reported no physical damage, although plant personnel felt slight building motion.
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