05000280/LER-1979-016-03, /03L-0 on 790425:cracks Noted in Concrete Support for 1-RH-E-1A & 1-RH-E-1B.Caused by Thermal Expansion of Heat Exchanger.Cracks Repaired.Heat Exchanger Supports Will Be Modified to Allow for Thermal Expansion

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/03L-0 on 790425:cracks Noted in Concrete Support for 1-RH-E-1A & 1-RH-E-1B.Caused by Thermal Expansion of Heat Exchanger.Cracks Repaired.Heat Exchanger Supports Will Be Modified to Allow for Thermal Expansion
ML18114A603
Person / Time
Site: Surry 
Issue date: 05/22/1979
From: Stewart W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18114A599 List:
References
LER-79-016-03L-01, LER-79-16-3L-1, NUDOCS 7905250157
Download: ML18114A603 (2)
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LER-1979-016, /03L-0 on 790425:cracks Noted in Concrete Support for 1-RH-E-1A & 1-RH-E-1B.Caused by Thermal Expansion of Heat Exchanger.Cracks Repaired.Heat Exchanger Supports Will Be Modified to Allow for Thermal Expansion
Event date:
Report date:
2801979016R03 - NRC Website
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Surry Power Station,~nit No. 1 Docket No: 50-280 Report Ho: 79-016/03L-0 Event Date: 4/25/79 e

Title of Report: *Residual Heat Rei:noval System -

Crack in Concrete Support for 1-RlI-E-lA,lB Heat Exchangers

1.

Description of Event

f.fith Surry Unit No. -1 at cold shuqdouu,. a ~outine walkdotm reve;il.led Sfacks, in the* concrete -.support for 1-PJl-E-lA and 1-RH-E-lB heat exchanger~;

A visual inspection of the Surry Unit No. 2 concrete supports was performed w.+/-th satisfactory *results.

The event constitutes a coridi tion repcp.:tahlE2 in. accordance with T.S. 6.6.2.b.(3).

2.

Probable Consequences/Status of Redundant Systems:

The Residual Heat Removal System removes the residual and sensible heat froiil the core and.reduces the temperature of the:reactor coolaD.t system during the second phase of unit cooldown.

The degradation.of the supports did not have any direct safety because the system was capable of performing its intended function.

the health and safety of the public were not affected.

3.

Cause of Event

implications There£ ore,*

It is believed that the cracks were caused by thermal expansion of the shell of the heat exchangers.

An evaluation of the concrete supports is being performed by the Architect Engineers.

4.

Immediate Corrective Action

Action was initiated to modify the:supports to allow for thermal expansion of the heat exchanger shells.

The *cracks in the concrete structure were repaired.

5.

Scheduled Corrective Action:

Uone required.

6.

Action Taken to Prevent Recurrence:

Ho additional action is considered necessary.

7.

Generic Implications:

None

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