ML19209C676
| ML19209C676 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 10/01/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Clayton F ALABAMA POWER CO. |
| References | |
| NUDOCS 7910170206 | |
| Download: ML19209C676 (2) | |
Text
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION 3
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REGION 11
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101 MARIETTA ST., N.W., SUITE 3100 0
o ATLANTA, GEORGIA 30303 OCT 1 1979 In Reply Refer To:
RII:JPO S 0-348 N,
Q t364 j Alabama Power Company Attn:
F. L. Clayton Senior Vice President Post Office Box 2641 Birmingham, Alabama 35291 Gentlemen:
This Information Notice is provided as an early notification of a possibly significant matter. It is expected that recipients will review the information for porsible applicability to their facilities. No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular, Bulletin, or NRR Generic Letter will be issued to recommend or request specific licensee actions.
If you have questions regarding the matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely,
_l Jamesh.O'Reilly Director
Enclosures:
1.
II Information Notice No. 79-25 2.
List of IE Information Notice Is, sued in Last Six Months 1148 306 7910170[b
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OCT 1 1979 Alabama Power Company.
cc w/ encl:
A. R. Barton Executive Vice President Post Office Box 2641 Birmingham, Alabama 35291 J. T. Young Vice President-Production Post Office Box 2641 Birmingham, Alabama 35291 C. Biddinger, Jr.
Manager-Corporate Quality Assurance Post Office Box 2641 Birmingham, Alabama 35291 H. O. Thrash Manager-Nuclear Generation Post Office Box 2641 Birmingham, Alabama 35291 H. G. Hairston, III Plant Manager Drawer 470 Ashford, Alabama 36312 R. E. Hollands, Jr.
QA Supervisor Post Office Box U Ashford, Alabama 36312
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Accession No.:7908220125 SSINS No.:6870 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, 11.C.
20555 September 28, 1979 IE Information Notice 79-25 REACTOR TRIPS AT TURKEY POINT UNITS 3 AND 4
Background
On August 3, Turkey Point Units 3 and 4 tripped while operating at full power.
A voltage spike on a second protection channel caused Unit 4 to trip during surveillance testing on the reactor protection system. This resulted in a loss of offsite power and subsequent shedding of non-essential loads. Unit 3 tripped as the result of high coolant pressure caused by a turbine runback.
Discussion While performing a periodic test on channel "C" of the T-Average and Delta T Protection Channels, a spurious signal on channel "A" ompleted a 2 out of 3 trip logic: tripping Unit 4.
This resulted in a J ass offsite power condi-u tion for Unit 4.
At this time, the Unit 4 startup transt%rmer was out of service due to performance of periodic maintenant e.
This candition caused the initiation of the emergency diesel generator 1 cad sequencer whP'. u 91ted in the shedding of non-vital loads. Among the non-vital loads shed, were ti.3e on Motor Control Center (MCC) "D" which is common to both units.
Since the Rod Position Indication System for both units is powered by the non-vital portion of MCC-D, a turbine runback on Un'c 3 was initiated upon loss of rod position indication. This resulted ir 4 t N tor trip on high pressurizer pressure. At the time, neither of the two pressurizer spray valves was avail-able. One was considered inoperable prior to the transient and the other, temporarily powered by the non-vital pwtiva of MCC-D, had become unavailable earlier as a consequence of the Unit 4 trip.
A subsequent review disclosed inadequacies in the administrative controls over the correction of operational problems exhibited by spray valve PCV-3-455B.
The original Hagan controller for spray valve PCV-3-455B had been disconnected and was replaced by another manual controller which was plugged into the valve control circuit and which had been taped to the top of a console in the main control room. The actual installation of the manual controller was not performed under established guidelines. Additionally, no temporary procedure had been issued to ensure consistent understanding between shifts of the operational control of this unusual c DUPLICATE DOCUMENT Entire document previously entered into system under:
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