05000260/LER-1980-035-03, /03L-0:on 800830,during Normal Operation While Performing TI-36,increase in Pressure on Shell Side of RHR Heat Exchanger 2D Was Detected.Caused by Leaking Check Valve Between Heat Exchangers

/03L-0:on 800830,during Normal Operation While Performing TI-36,increase in Pressure on Shell Side of RHR Heat Exchanger 2D Was Detected.Caused by Leaking Check Valve Between Heat Exchangers

ML18025B083
Person / Time
Site:	Browns Ferry
Issue date:	09/12/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025B082	List: 05000260/LER-1980-035, Forwards LER 80-035/03L-0 05000260/LER-1980-035-03, /03L-0:on 800830,during Normal Operation While Performing TI-36,increase in Pressure on Shell Side of RHR Heat Exchanger 2D Was Detected.Caused by Leaking Check Valve Between Heat Exchangers
References
LER-80-035-03L-01, LER-80-35-3L-1, NUDOCS 8009190454
Download: ML18025B083 (5)

LER-1980-035, /03L-0:on 800830,during Normal Operation While Performing TI-36,increase in Pressure on Shell Side of RHR Heat Exchanger 2D Was Detected.Caused by Leaking Check Valve Between Heat Exchangers

Event date:
Report date:
2601980035R03 - NRC Website

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OO SOURCE LJQ 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 76 RfPORT OA'ff 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES QIO During normal operation while performing TI-36, test 'personnel detected an

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~increase in pressure on'I)e shell side of RHR heat exchanger 2D.

(TS 3.5.B.12).

i A suspected leak was investigated by hydrostatic testing.

No tube leaks or head

~leaks were found.

Redundant systems were operable.

There was no hazard to the public health or saf ety.

Previous events:

296/8033, 260/8034, 259/8043 and 259/7823

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in a false indication that 2D heat

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~A check valve between 2B and 2D RHR heat exchangers was found leaking resulting 1< inch 600 lbs.

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.Technical Specification Involved Reported Under Technical Specification Date of Occurronce'ssue i

Time of Occurs ence Unit Identification and Descr~ition'of Occurrence:

Test personnel detected an increase in pressure on the shell side of RHR heat exchanger 2D while performing TL-36, RHR heat exchanger leak test.

Cond!tions Prior to Occurrence:

U-1 at 97% We.

U at 91% We.

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at 100% We.

Action specified in the Technical Specification Surveillance Requirements met due to inferable e ui ment.

Describe.

Sl's performed on RHR pumps, core spray pumps and diesel generators.

A~parent Cause of Occurrence:

Refer to the attached sheet.

Analtrsis of Occur! ence:

There was no danger to the health or safety of the public, no damage to the plant or equipment and no resulting significant chain of events.

( OI"r(!ctive A(.t!On:

As. a precautionary measure the torque on the floating head nuts was increased from 50 to 225 ft/lbs.

The defective check valve was repaired.

F;!ilu!'c I) iLs:

296/8033, 260/8034, 259/8043 and 259/7823.

((Retention:

Period - Lifetime; Responsibility - Administrative Supervisor

<<:Revi. ion:

Testing of 2D RHR Heat Exchanger August 29, 1980 On August 30,

1980, when a unt 2 operator initiated D2 RHRSW pump to pressurize 2D RHR heat exchanger for an RHR to RHRSW leak check, an increase in RHR Line pressure was observed by PS74-65 and trans-mitted to Panel 9-3 in the control room.

This increase in RHR pressure indicated a problem with 2D RHR heat exchanger.

2D RHR heat exchanger's outer shell was removed and the floating head was pressurized using a RHRSW pump.

RHRSW pump pressure dea'd-head pressure is approximately 160 psig.

The pressure test revealed no visual leakage on. the floating head and no leaking tubes.

The lock nuts were inspected for tightness and no loose nuts were found.

Since RHR heat exchanger 2B was known to have a service water leak and the PS74-65 was located on the line

,common to both B and D heat, exchangers, the problem was investi-gated further.

Check valve, 2-23-607 was found to be leaking.

This valve is located on the RHRSW charging waterline for B and D heat exchangers.

This leaking check valve allowed B RHRSW to be charged, thus leaking and causing an increase in RHR line pressure.

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