05000250/LER-1979-025-03, /0BL-0:on 790807,chemical & Vol Control Sys Holdup Tank Was Ruptured.Caused by Low Internal Tank Pressure.Unit Was Shut Down & Repairs Were Completed

/0BL-0:on 790807,chemical & Vol Control Sys Holdup Tank Was Ruptured.Caused by Low Internal Tank Pressure.Unit Was Shut Down & Repairs Were Completed

ML17338B121
Person / Time
Site:	Turkey Point
Issue date:	09/06/1979
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17338B119	List: 05000250/LER-1979-025, Forwards LER 79-025/03L-0 05000250/LER-1979-025-03, /0BL-0:on 790807,chemical & Vol Control Sys Holdup Tank Was Ruptured.Caused by Low Internal Tank Pressure.Unit Was Shut Down & Repairs Were Completed
References
LER-79-025-03L-01, LER-79-25-3L-1, NUDOCS 7909270565
Download: ML17338B121 (4)

LER-1979-025, /0BL-0:on 790807,chemical & Vol Control Sys Holdup Tank Was Ruptured.Caused by Low Internal Tank Pressure.Unit Was Shut Down & Repairs Were Completed

Event date:
Report date:
2501979025R03 - NRC Website

text

NRC PORM SSB fl77l LICENSEE EVENT REPORT U. S NUCI.EAR REGULATORY COMMISSION CONTROL BLOCIC:

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$0 9 I QQCKKT NUMSSR 49 49 SVSNT OATS EVENT OESCRIPTION ANO PROBABLE CONSEQUENCES QIO

~02 Durin power o eration, the B CKCS holdup tank B

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RSPQRT OA< 5 50 was ruptured as a result of low" internal tank pressure.

CVCS holdup tank rupture is discussed in FSAR Section 14.2.2 and would not adversely affect public health and

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safet Similar occurrences have been reported as LER 250-78-17 and 5

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40 41 4'2 42 47 CAUSE OESCRIPTION ANO CORRECTIVE ACTIONS Q27 o

hort te corrective action has been to tern oraril re air the B & C

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CVCS holdu tanks.

Permanent re airs and installation of vacuum reliefs are being effected on the A tank with work to be done serially on B

& C tanks.

The unit was shutdown and repairs were completed to preclude abnormally hot water from being transferred to the holdup tanks.

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REPORTABLE OCCURRENCE 250-79-25 LICENSEE EVENT REPORT

'PAGE TNO Additional Event Descri tion and Probable Conse uences:

During power operation, the B CVCS holdup tank was ruptured as a result of low internal tank pressure.

The most probable cause of the low internal pressure was condensation of steam inside the tank when a large quantity of relatively cool water from a normal letdown contacted the hot contents of the tank.

The tank temperature was abnormally high due to a previous transfer of hot water from the Unit No.

3 Reactor Coolant Dra'in Tank to the B CVCS holdup tank.

During this occurrence, the cover gas system could not respond rapidly enough to replace the condensed steam.

The tank rupture resulted in a release of a gaseous mixture with a total activ-ity of 5.6 curies; this represents 0.0059% of the quarterly gas release limit.

Tank Data:

13,000 ft3 15 psig internal pressure 200 F

0 psig external pressure

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