05000327/LER-1981-075-03, /03L-0:on 810623,found Sufficient Clearance Did Not Exist Between Alternate Charging Line from Regenerative Heat Exchanger to Reactor Coolant Loop 4.Caused by Inadequate Original Drawings

/03L-0:on 810623,found Sufficient Clearance Did Not Exist Between Alternate Charging Line from Regenerative Heat Exchanger to Reactor Coolant Loop 4.Caused by Inadequate Original Drawings

ML20009F553
Person / Time
Site:	Sequoyah
Issue date:	07/21/1981
From:	Harding M, Kirk G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F551	List: 05000327/LER-1981-075, Forwards LER 81-075/03L-0 05000327/LER-1981-075-03, /03L-0:on 810623,found Sufficient Clearance Did Not Exist Between Alternate Charging Line from Regenerative Heat Exchanger to Reactor Coolant Loop 4.Caused by Inadequate Original Drawings
References
LER-81-075-03L, LER-81-75-3L, NUDOCS 8107310296
Download: ML20009F553 (2)

LER-1981-075, /03L-0:on 810623,found Sufficient Clearance Did Not Exist Between Alternate Charging Line from Regenerative Heat Exchanger to Reactor Coolant Loop 4.Caused by Inadequate Original Drawings

Event date:
Report date:
3271981075R03 - NRC Website

text

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["I I--] l. or l e i na l drawings did not indicate the reautred clearance for the alternate chargine

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!i I I line in the area of the pressurizer base.

Obstructions and interferences were removed i [gl and the hanger was relocated on the alternate charging line on 6-24-81.

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Tennsgres valicy nutnority Sequoyah Nuclear Plant LER SUPPLDENTAL INFORMATION SORO-50-327/81075 Technical Specification Involved:

3.4.10 Report eil Under Technical Specification:

6. 9.1.13.b iLite ol Ocentrence: 6/23/81 Time of Occurrence:

0800 CDT Identification and Description of Occurrence:

During a Unit 2 piping inspection. a piping interference was discovered.

Upon inspection of similar piping on Unit 1 it was discovered that the alternate charging line from the regenerative heat exchanger to reactor coolant loop #4 did not have sufficient clearance with obstructions in the area of the concrete pressurizer base.

Conditions Prior to Occurrence:

Unit 1 in Mode 4 with RCS temperature and pressure at 310 F and 700 PSIG.

Apparent Cause of Occurrence _:

w.

Original drawings did not indicate the required clearance for the alternate charging line in the area of the pressurizer base.

Analysis of Occurrence:

With no clearance in this area, thermal expansion of the pipe could result in overloading of a pipe support on the alternate charging line and over-loading the alternate charging line to RCS. loop 4 connection.

Corrective Action

Obstructions and interferences were removed and the hanger was relocated on the al ternate ~ charging line. This work was completed on 6-24-81.

Failure Data:

None