ML20084C744

AO 250-74-6:on 740503,after Safety Injection Sys Pump 3A Started to Add Water to Safety Injection Accumulators,Pump Indicated Abnormally Low Running Current & Discharge Pressure.Cause Unknown.No Abnormalities Found

ML20084C744
Person / Time
Site:	Turkey Point
Issue date:	05/10/1974
From:	Schmidt A FLORIDA POWER & LIGHT CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
References
AO-250-74-6, NUDOCS 8304080193
Download: ML20084C744 (4)

Text

, 1 P.O. BOX 3100 MIAMI, FLCRIDA 33101

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Stay 10, 1974

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31r. John F. O' Leary, Director

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Office of Regulation ft3h U. S. Atomic Energy Commission 60-250 'd 7 IElIP.1*~d id[46  ;

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Dear bir. O' Leary:

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ABNORE1L OCCURRENCE NO. 250-74-6 D'.YI@N'

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FIAY 10, 1974 OCCURRENCE DATE: E1Y 3, 1974 '

TURKEY POINT UNIT NO. 3 REDUCED PERFORE\NCE OF SAFETY INJECTION SYSTEh! PUFIP DUE TO ENTRAPPED AIR A. CONDITIONS PRIOR TO OCCURRENCE The recctcr ::cc in routinc pc;;cr operation' at 00*a pc;tcr.

B. DESCRIPTION OF OCCURRENCE At approximately 9:27 a.m., the 3A safety injcction system (SIS) pump was started in order to add water to the Unit 3 safety injection accumulators. The pump started but in-dicated abnormally low running current and low discharge pressure. The pump was immediately stopped and valve line-up was verified to be correct. With appropriate maintenance personnel present, the 3A SIS pump was restarted with similar results. The ensuing investigation revealed that the pump casing contained air. It was then vented and tested with satisfactory results. The remaining SIS pumps (3B, 4A and 4B) were also tested and performed satisfactorily.

C. CAUSE OF OCCURRENCE The exact cause of the air in-Icakage could not be determined.

Ilowe ve r , subsequent investigation revealed that the most-likely cause of the in-leakage w~as from maintenance recently performed on the safety injection system. On alarch 25, 1974, a modification was performed-on valve 3-860A which is the residual heat removal (RIIR) pump suction stop valve from the

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0 Mr. John F. 01eary, Director O

" Page 2 May 10, 1974 ,

containment post accident recirculation sump. The valve modification required draining of the line between 3-860A and 3-861A (see attachment). On April 10, 1974, valve 3-861A was cycled according to the Safety Injection System Periodic Test OP4104.1 which could have allowed the trapped air to enter the Ri!R system piping. Operating logs indicate that the 3A SIS pump was run periodically between April 10 and May 3, 1974, to add water to the accumulators. This could have drawn the trapped air in the RIIR piping into the 3A SIS pump by way of the common suction piping.

D. ANALYSIS OF Tile OCCURRENCE To satisfy the requirements of the safety analyses, any two safety injection pumps must be operational. This require-ment was satisfied in that the safety injection pumps 3B, 4A and 4B were all operational at the time the 3A SIS pump was experiencing reduced performance. Therefore, neither reactor safety nor the health and safety of the public were jeopardized by this occurrence.

E. CORRECTIVE ACTION Immediate corrective action consisted of stopping the 3A STR pump to prevent possible pump damage. The pump and associated piping were visually inspected for abnormalities ;

but, none were found. The Unit 3 safety injection system valve line-up was checked and verified to be correct. The 3A SIS pump was then vented via two installed casing vents which are normally blind flanged. A small amount of air was released from the vent at the suction end of the casing, and a larger volume of air was released from the vent at the discharge end of the pump casing. After the pump was vented, it was then tested satisfactorily.

The safety injection system (SIS) and residual heat removal (RIIR) system piping and pumps were also vented to ensure that these systems were free from trapped air. Appropriate work documentation has been initiated for the installation of additional vent lines and valves in approved locations in I

the SIS and RllR systems.

F. FAILURE DATA The 3A SIS pump failed to start on Feburary 2, 1974, (Abnormal l

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Mr. John F. GNeary, Director O

- ~Page 3 h!ay 10, 1974 .

Occurrence Report No. 3-74-2) due to a malfunction of the circuit breaker charging circuit.

This abnormal occurrence is the first of this type at the Turkey Point nuclear units.

J Very truly yours, I

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s. D. Schmidt Director of Power Resources DWR/kmw cc: h!r . Norman C. Afoseley -

Af r . Jack R. Newman i

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