IR 05000250/1986034
| ML17342A696 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 09/02/1986 |
| From: | Conlon T, Ruff A, Matt Thomas NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML17342A695 | List: |
| References | |
| 50-250-86-34, 50-251-86-34, NUDOCS 8609110211 | |
| Download: ML17342A696 (12) | |
Text
~p,S RECy UNITED STATES NUCLEAR REGULATORY COMMISSION REGION 11 101 MARIETTASTREET, N.W.
ATLANTA,GEORGIA 30323 Report Nos.:
50-250/86-34 and 50-251/86-34 Licensee:
Florida Power and Light Company 9250 West Flagler Street Miami, FL 33102 Docket Nos.:
50-250 and 50-251 Facility Name:
Turkey Point 3 and
License Nos.:
DPR-31 and DPR-41 D te Soigne-z-F Approved Inspection Conducted:
Ju1'y'22-26,.1986 I'nspector:
A. B. Ruff Date Signed A.A'
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M.
omas
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Con on," Sect>on C se Date Soigne Plant System, Section Division of Reactor Safety, I
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,, SUMMARY Scope:
This special announced inspection was conducted in the areas of modifications in electrical loads for emergency diesel generators (EDG)
and integrated safeguar ds testing associated with modifications and EDG load evaluation.
Results:
No violations or deviations were identified.
8609110211 860'908 PDR ADQCK 05000250
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REPORT DETAILS 1.
Persons Contacted Licensee Employees
- F. H. Southworth, Plant Manager (Acting)
- D. D. Grandage, Operations Superintendent J. Arias, Jr., Nuclear Licensing and Regulatory Compliance Supervisor R. Hogue, Test Coordinator T. Finn, Operation Supervisor L. Huenniger, Startup Supervisor
- R. Earl, guality Control Supervisor
- R. Hart, Licensing Engineer
- R. Teuteberg, Licensing Engineer T. Abbatiello, Supervisory Engineer Performance Monitoring, guality Assurance Other licensee employees contacted included construction craftsmen, engineers, technicians, operators, mechanics, security force members and office personnel.
NRC Resident Inspector
- D. R. Brewer
- Attended exit interview 2.
Exit Interview The inspection scope and findings were summarized on July 26, 1986, with those persons indicated in the paragraph above.
The inspectors described the areas inspected and discussed in detail the inspection findings.
No dissenting comments were received from the licensee.
The licensee did not identify as proprietary any of the materials provided to or reviewed by the inspectors during this inspection.
3.
Licensee Action on Previous Enforcement Matters This subject was not addressed in the inspection.
4.
Unresolved Items Unresolved items were not identified during the inspectio 'a t
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5.
Emergency Diesel Generator (EDG) Load Evaluation General Prior to November 1985, a potential existed for placing electrical loads automatically on the EDG that exceeded the EDG electrical loads specified in the Turkey Point Technical Specifications.
This was determined by an evaluation made by Florida Power and Light Co.
(FPSL).
The evaluation was required by a Region II Confirmation of Action Letter, dated April 2, 1986.
FP8L's corrective action was provided to the NRC in their letter L-86-243, dated June 12, 1986.
As a result of the corrective action, plant change modifications (PCM)
were issued and made to delete some automatically connected loads that were not needed for safe shutdown.
In addition, other loads that were automatically connected prior to the modifications were changed so that manual operation is required to insure that the EDGs are not overloaded.
Tests were performed to insure that the plant, as a result of PCMs and administrative procedures, performed as designed.
The following discusses some of the PCMs, test procedures, and the EDG safeguards loading tests and is based on review of licensee's records and tests, discussion with licensee's representative and witnessing of in plant testing.
a.
Plant Change Modifications 86-61 and 86-62 Units 3 and 4 Normal Containment Cooling (NCC)
Fan Modification The NCC fans are nonsafety-related and no credit is taken for the operation under loss of offsite power (LOOP) conditions to mitigate the effects of the accident condition considered in Chapter 14 of the Final Safety Analysis Report (FSAR).
With the LOOP, the EDG start and electrical loads are automatically sequenced onto the EDG supplied
.. busses.
Prior to the modification, the operating NCC fans would be one of the loads that would be automatically added to the EDG load.
Manual operation is now required to re-energized these NCC fans.
This manual operation alerts the operator to consider EDG loading and offsite power prior to re-energizing these circuits.
This plant design change was functionally tested as part of preoperational procedure (POP)
and was verified to be correct during the performance of OSP-203, Engineered Safeguards Integrated Test.
b.
Plant Change Modification 86-65, Boric Acid Transfer Pumps and Tank Heaters The boric acid in the boric acid tank (BAT) is maintained at 165'F when power is available.
Therefore, when there is a
LOOP it can be assumed that boric acid temperature is 165'F.
This temperature is well above the 130'emperature that 12% boric acid begins to precipitate.
FPLL's analysis shows that a loss of BAT heaters for a period of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> will
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not result in a temperature decrease below 145'F which is required by their Technical Specifications.
Prior to this modification, with a
LOOP, these devices would automatically be loaded onto the EDG.
The automatic loading feature for these devices has been disabled with this modification.
Plant operators will be required to manually re-energized these devices when offsite power is restored or when EDG loading has stabilized and is within acceptable limits.
This plant design change was functionally tested by preoperational procedures and was verified to be correct during the performance of OSP-203.
Plant Change Modifications 86-66 and 86-67, Turbine Auxiliaries Modifications The bearing lube oil pump, turning gear oil pump, and turning gear motor, prior to the modification, would trip off on LOOP and would automatically start and load onto the EDG.
These devices had their electrical circuitry modified such that the automatic start will be blocked on undervoltage by relays as a result of a trip due to LOOP.
Following restoration of voltage and with the proper interlocks satisfied these devices can manually be started and/or stopped from the control room.
This plant design change allows the operator to manually start the devices when offsite power is restored or when EDG loading has stabilized and is within acceptable limits. The plant design change was functionally tested by preoperational procedures and was verified to be correct during the performance of OSP-203.
Plant Change Modifications 86-95, and 86-96, Motor Control Centers (NCC)
3A, 4A, and D Modification of Non-Vital Tie Breakers The modification for these NCCs was to take the non-vital portion of the MCCs and separate it by two series breakers from the vital portion.
Prior to this modification, the vital and non-vital portions were connected by a single tie breaker in the MCC.
The tie breaker would automatically open after a time delay on LOOP. If the bus voltage was restored prior to the time delay or if the single tie breaker failed to open, the non-vital loads would be picked up as part of the auto-connected loads of the EDG.
Modifications were made so that the non-vital and vital sections are not connected by a single tie breaker.
The non-vital loads are now being supplied from the load centers (LCs)
with two breakers in series (a LC feeder breaker and an NCC non-vital incoming feeder breaker).
llith a loss of load center bus voltage, the non-vital MCC will drop out with no time delay by independent trip circuits on both the LC feeder breaker and the MCC incoming feeder breakers.
This insures that the non-vital loads are not connected automatically to the EDG loads.
Operator action is needed to restore electrical power to these non-vital MCCs after offsite power is restored or after the EDG loads are stabilized and are within acceptable limits.
These plant design changes were functionally tested by preoperational
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potential transformer circuits which measure EDG output load that is indicated in the control room.
A procedure change was written to obtain the EDG KW load from the measurements taken at the breakers.
This method was repeated for subsequent test sections involving EDG loading.
The problem had not been resolved at the conclusion of this inspection, and the licensee stated that the equipment deficiencies would be resolved prior to Unit 3 startup.
No violations or deviations were identifie I
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