ML17338A609

Requests Addl Info Re Emergency Power Sys Periodic Tests to Complete 780908 Amend Request Review

ML17338A609
Person / Time
Site:	Turkey Point
Issue date:	03/09/1979
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
References
NUDOCS 7904100114
Download: ML17338A609 (6)

Text

158CH 9

1979 Docket Nos. 50-250 and 50-251 Dr. Robert E. Uhrig Vice President Florida Power and Light Company Advanced Systems and Technology P. 0. Box 529100 Miami, Florida 33152

Dear Dr.. Uhrig:

DISTRIBUTION and 50-251 NRC PDR Local PDR V. Stello D. Eisenhut R. Vollmer B. Grimes A. Schwencer M. Grotenhuis C. Parrish OELD NRR Rdg ACRS (16)

ISE (3)

. TERA J.

Buchanan Me have reviewed your amendment request submitted by letter dated September 8, 1978 for the Turkey Point Nuclear Generating Unit Nos.

3 and 4.

In order that we may complete our review, please provide additional information as indicated in the enclosure within 45 days of receipt of this letter.

Sincerely, gjiginal Signed 89'nclosure:

Request for Additional Information cc:

w/enclosure See next page A. Schwencer, Chief Operating Reactors Branch 81 Division.of Operating Reactors

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Florida Power

& Light Company March 9, 1979 cc:

Mr. Robert Lowenstein, Esquire Lowenstein,

Newman, Reis

& Axelrad 1025 Connecticut Avenue, NW Suite 1214 Washington, D.C.

20036 Environmental

& Urban Affairs Library Florida International University Miami, Florida 33199 Mr. Norman A. Coll, Esquire

Steel, Hector and Davis 1400 Southeast First National Bank Building Miami, Florida 33131 Florida Power 8 Light Company ATTN:

Mr. Henry Yaeger Plant Manager Turkey. Point Plant P.

Q. Box 013100 Miami, Florida 33101

RE ST FOR ADDITIONAL INFORMATION TORKEY POINT UNITS 3 5 4 TECHNICAL SPECIFICATION ON EMERGENCY POWER SYSTEM PERIODIC TESTS A.

Provide modifications to the proposed changes to the Turkey Point Unit 3 8 4's Technical Specifications in the following areas:

1.

During the tests to be required each 18 months:

a.

Includ'e verification that required voltage and frequency is automatically attained within acceptable limits and time during the diesel startups using simulated loss of offsite power and safety injection signal.

b. Initiate the diesel startup on alternate tests by (1) simulating loss of onsite powe first, allowing loading to take place and the unit stablize and then simulate a safety injection signal, sequence safety loads and stablize; and (2) simulate a safety injection signal.first allowing the unit to come up to rated voltage and speed and then simulate a loss of offsite power, allow loading to take place and the unit stablize.

c..Confirm the diesel generator trips which are in effect during the test mode of diesel operation to be inoperable during times when the diesel generator is not in a test mode.

d. Verify that voltage and frequency and:cooling system functions are within design limits during the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> full load test.

e. In addition to performing a test where the loss of the largest single load is experienced, subject the unit to a complete

'oss of load and verify that voltage requiremetns are met and overspeed limits are not exceeded.

f. Within 5 minutes of securing the diesel generator following the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> full load test simulate loss of all ac voltage to demonstrate that the unit can star't automatically and attain the required voltage and frequency within acceptable limits and time.

g. Demonstrate the ability=-to-.-(a) synchronize the diesel generator unit with offsite power while the unit is connected to the emergency load; (b) transfer this load to the offsite power; (c) isolate the diesel generator unit; and (d) restore the diesel generator unit to standby status.

2.

At least once per 10 years or after any modifications which could affect diesel generator independence, start both diesel generators simultaneously duri.ng unit shutdown and verify that both diesel generators accelerate to rated speed in the required time.

This

test should only be run when both reactors am shutdown.

3.

During the tests to be required during normal plant operation (nominally once each '30 days).

a.

Perform the tests. independently (nonconcurrent1y) on each diesel generator unit.

b. Verify.voltage and frequency to be attained within acceptable limits and time.

c. Confirm the components of 'the diesel generator unit required for automatic startup are operable.

Describe in the test procedure which components these are.

Provide a copy of the test pro-cedure to NRC (one time).

d. Verify that the diesel generator cooling system functions within design limits during the one hour'full load test.

4.

Propose a specific test schedule similar to that recommended in Regulatory Guide 1.108, Revision 1, August 1977,, "Periodic Testing of,Diesel Generator Units Used As Onsite Electric Power Systems At Nuclear Power Plants,"

(see Section C.2. d of R.G.

1.108) for the tests to be required during normal plant operation.

The test schedule should be based on the demonstrated performance of the diesel generator units at Turkey Point Units 3 and 4.

Test frequency should be increased as a specific number of failures to start or attain successful loading with required voltage and frequency in the required time are expeirenced.

As a history of successful operation (a specific number of successful operations) is accummulated test intervals may be lengthened up to a 30 day test interval.

(The technical basis for the proposed test schedule should be provided to NRC in a letter).

Propose a definition of diesel generator unit fai,lure, similar to that of R.G. 1. 108, Section C.2.e.,

to use as a basis for counting valid tests and success or failures of such tests.

This definition should utilize a specific'elineation of the physical boundaries of the unit-being tested.

B.

Perform a one time full load test of each diesel'enerator unit, including 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at the 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> rating at the beginning of the test, for a total of at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

Include in the test simultaneous operation of both diesel generator units for at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

monitor the load,

voltage, frequency and cooling system performance during the test.

The results of the test should be reported to NRC.

This t st should be performed when both plants are shutdown.

~

4 If the voltage, frequency and cooling system performance remain within the same parameter valves during the last 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> of the test as they did during the first 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> at the rated load, the staff position is that an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> test may be substituted for the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test called for in Regulatory Guide 1.108, Position C.2.a(3), other-wise, the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test specified in 1.108 Position C.2.a(3) should be performed.

C.

Review the fuel oil supply system for the diesel generator units to determine if any single failures could result in failure to provide fuel to both untis.

Provide report of this review to NRC. If the fuel oil supply system is found to be free from single failures which can prevent supply of fuel oil to both diesel day tanks, except for the common main storage tank and the pipe from this tank to the fuel transfer

pumps, the system will be considered, acceptable by the staff. If such a finding cannot be made appropriate changes should be proposed in the system.

D.

In accordance. with the provisions of Reg.

Guide 1.108, Position C.3, log all valid 'diesel generator unit tests where the test is successful (i.e., no failure is experienced).

Report with the LER, the number of successful tests since the previous failure each time a diesel generator unit failure is experienced.

In addition, attach the following information to the LER:

(1) identify the unit involved; (2) identify the failure as the nth in the last 100 tests; (3) describe the cause of failure; (4) describe corrective measures ta'ken; (5) indicate the length of time the diesel generator unit was unavailable; (6) define the current surveillance test interval; and (7) verify the test interval is in conformance with the schedule to be proposed in Item A.4 above.

If the number of failures in the last 100 valid tests is seven or more,.

the reliability of the diesel generator units requires special evaluation and the information provided on the report form should be supplemented, as needed, by additional narrative material that:

(1) Identifies the reported failrue as the 7th or greater failure in the last 100 valid tests; (2) Describes corrective measures, taken or planned, to increase the reliability of the generator units; (3) Provides an assessment of the existing reliability of electric power to engineered safety feature equipment; (4) Provides the licensee's basis for continued plant operation if that is planned; and

(5) Provides a summary of all valid tests that occurred within the time period over which the last 100 valid tests were performed.

and. verifies that surveillance testing during,this period was.

in conformance with the schedule to be propsoed in, Item A.4 above.

E.

Confirm that the diesel generator lockout features are periodically tested.

Provide a copy of the test procedure, which includes these tests.