ML19256C594
| ML19256C594 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 06/01/1979 |
| From: | Bryan S, Klinger G, Nolan F NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-79-132, NUDOCS 7910100568 | |
| Download: ML19256C594 (1) | |
Text
PRELIMINARY NOTIFICATION June 1, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-79-132 This preliminary notification constitutes EARLY notice of an event of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation and is basically all that is known by IE staff as of this date FACILITY:
Florida Power and Light Company Turkey Point, Unit Nos. 3 and 4 Docket Nos. 50-250 and 50-251 Homestead, Florida
SUBJECT:
DIESEL GENERATORS INOPERABLE Turkey Point Unit 3 is being brought to cold shutdown from a hot shutdown condi-tion, based on the inability to declare either of the two Emergency Diesel Generators (D/G) operable.
Unit 4 is in a refueling outage. The licensee had previously reported, to the NRC, a failure of the A D/G on Monday, May 28 due to a failed field transformer. -This transformer failure occurred after 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> of a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> full load test.
The test was conducted at the request of NRR.
Subse-quent testing of the A D/G with a new field transformer, resulted in a repeat failure of the replacement transformer.
Based upon information from vendors, the licensee disconnected the transformer neutral froia the A D/G and eliminated circulating currents, which were the apparent source of the transformer failures.
The A D/G can be used if required, but has temporary field transformers installed.
At 7:00 a.m. on May 31 the licensee attempted. to test the B Diesel Generator with the field transformers modified to eliminate circulating currents. The B Diesel Generator voltage could not be controlled and the B D/G was also declared inoperable. The failure has been tentatively identified as a loose fuse holder.
The availability of replacement field transformers is being investigated.
Both Units 3 and 4 will remain in cold shutdown until both diesel generators are fully operable.
Media interest is not expected at this time.
Neither licensee nor the NRC plan to issue a news release.
The State of Florida has been informed.
Region II (Atlanta) received notification of this occurrence by telephone from the licensee at 1:15 p.m. on May 31.
Contact:
GKlingler, IE x28019 FNolan, IE x28019 SEBryan, IE x28019 Distribution:
Transmitted H St 9i15 Chairman Hendrie Commissioner Bradford S. J. Chilk, SECY Cocenissioner Kennedy Commissioner Ahearne C. C. Kammerer, CA Commissioner Gilinsky ACRS (For Distribution)
Transmitted:
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R. G. Ryan, OSP B-
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PRELIMINARYNOTf[1C4 TION 10100y,