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Deficiency Rept Re 720908 Unusual Event 72-1 Concerning Simultaneous Safety Injection Signal.Initially Reported on 720908.Caused by Design Deficiency in Vital 120-volt Distribution Sys.Static Inverters & Station Batteries Added
	ML20084M589
Person / Time
Site:	Turkey Point
Issue date:	12/11/1972
From:	Coughlin J; FLORIDA POWER & LIGHT CO.
To:	Kruesi F; US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084M560	List: ML20084M589; ML20084M631; ML20084N516;
References
	10CFR50.55(E), NUDOCS 8306020241
	Download: ML20084M589 (6)
	v • d • e

P.o. BOX 3100 MIAMI FLORIDA 33101

%/ L)

FLOR:DA POWER & LIGHT COMPANY December 11, 1972 Mr. Frank E. Kruesi, Director Directorate of Regulatory Operations U. S. Atomic Energy Commission Washington, D. C. 20545

Dear Mr. Kruesi:

Re: Turkey Point Plant Units 3 and 4 Docket Nos. 50-250 and 50-251 In accordance with 10CFR50.55(e), a design deficiency in the instrument power system is reported.

The effect of this was Unusual Event 72-1 reported in a letter of September 8, 1972 to the Director, Directorate of Licensing. The following is quoted from that letter:

"72-1. Simultaneous safety injection on both units.

At 5:15 a.m., August 12, 1972, Preoperational Procedure T-4000.1, Integrated Test of Engineered Safeguards System and Emergency Power System was in progress on Unit 4. Unit 4 is not licensed for operation and the reactor coolant system was open. Unit 3 was in cold shutdown. The first part of the test was injection of safety injection and containment spray signal with offsite pcwer available. All safeguards related equipment functioned properly.

The second part of the test was injection of safety injection water into the reactor coolant system and containment spray signal with loss of offsite power to both units with both diesels avail-able. As loads were sequenced on the A diesel, severe voltage transients were noted and voltage decayed sufficiently to cause the 3A and 4A busses to restrip on undervoltage. The voltage transient was caused by safety injection loads for both units sequencing back

[

onto the busses. The safety injection signal was present on No. 3 unit because 3A inverter was out of service and its vital bus was being fed from the AC maintenance source (motor control center).

"Normally the three safeguards channels are fed by inverter A, inverter B and an AC source from a motor control center. Con-sequently, with the A inverter out of service, two safeguards channels were being fed from motor control centers. When all AC power was lost to both units for the loss of offsite power portion of the test, the two AC channels fed by motor control centers generated signals for safety injection because of the fail safe feature of the circuitry. This 2 out of 3 logic gave a safety in- !

jection signal for Unit 3. 'd j I[ff '

p t,q,.e< d> 1 l

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8306020241 730206 <3 e. \

n 1GSO PDR ADOCK 05000250 i S PDR l

H E LPIN G BUILO FLORID A s-

. . - . . . _ _ _ _ _ . _. ~ . _ _ .-

~

O o Mr. Frank E. ' Kreusi December 11, 1972 s

"The diesels are not designed to supply safety injection loads for

both units simultaneously, but to supply safety-injection loads for the accident unit only, and hot shutdown loads for the other unit.' ~

! Design changes will be required to prevent loss of offsite power ,

from causing spurious 2 out of 3 logic signals. The safety injection ,

initiating signals for Unit No. 4 have been inhibited to prevent i simultaneous safety injection actions on both units."

Corrective' action is underway as-follows:

l.

1. Eight _ (8) - static inverters are being added.

l 2. Two (2) station batteries are.being added.

-3. Three - (3) static battery chargers are being added.

4. A new battery roon is being built to house equipment.

The new design is shown on attached Figures 8.2-4a and 8.2-4b which will be replacement for FSAR Figure 8.2-4 which shows the original design.

The new design meets all applicable FSAR design criteria.

, ery tryly yours hLW dNW hmes CoughlIa ice Preside #j nt JC:rp 1

cc: Mr. John G. Davis, Director Directorate of Regulatory Operations l Region II - Atlanta, Ga.

i

, Mr. Jack R. Newman l Newman, Reis & Axelrad Washington,' D. C.

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ML20084M589

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Dear Mr. Kruesi:

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