05000280/LER-2078-028-03, L-0 for Surry 2 Re Containment Pressure Exceeded Allowable Limit

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L-0 for Surry 2 Re Containment Pressure Exceeded Allowable Limit
ML19105A301
Person / Time
Site: Surry  Dominion icon.png
Issue date: 09/01/1978
From: Stallings C
Virginia Electric & Power Co (VEPCO)
To: O'Reilly J
NRC/RGN-II
References
Serial No. 498 LER 1978-028-03L-0
Download: ML19105A301 (4)
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LER-2078-028, L-0 for Surry 2 Re Containment Pressure Exceeded Allowable Limit
Event date:
Report date:
2802078028R03 - NRC Website
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NRC FORM 366 (7-77)

U.S. NUCLEAR REGULATORY COMMISSION.

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!During normal operation the containment partial pressure exceeded the allowable limit*

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las specified in the Surry Unit 1 and 2 Order for Modification of License, dated June

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This event is reportable as per Technical Specifications 6.6.2~b.(2).

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~he event was caused by a small leak in the Containment Radiation Monitoring Syst£ID, ITJJ] jContairunent partial pressure was reduced using the containment vacuum pumps.

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, 5urry Power Station, Unit 2 Docket No: 50~281 Report No: 78-028/03L-0 Event Date: 08-03-78 Title of Report:

Containment Partial Pressure

1.
2.

Description of Event

During normal operation the containment partial pressure exceeded the allowable limit as specified in the Surry Unit 1 and 2 Order for Modifica-tion of License dated June 29, 1978.

At the time of the event, the service water temperature was 85°F and the Refueling Water Storage Tank temperature was less than 45°F.

The partial pressure limit was exceeded by 0.05 psia before corrective action returned the pressure within the limits.

This event is reportable as per Technical Specifications 6.6.2.b.(2).

Probable Consequences and Status of Redundant Systems The containment pressure must be maintained below a specified limit in order to insure adequate conservatism in the ECCS performance as analyzed in the FSAR.

A margin of partial pressure is permitted (not to *exceed 0.25 psi) to sustain operation while action is taken to correct a problem.

If the condition cannot be corrected, the reactor must be shutdown.

Containment* pressure remained within the allowable limits at all times,.

and pressure instrumentation.remained operable and capable of CLS initiation.

The health and safety of the general public were not affected.

3.

Cause

This event was caused by a small leak in the containment radiation moni-toring system and abnormally high ambient temperatures causing the containment

.to heat up and pressurize more rapidly than normal following unit startup.

4.

Immediate Corrective Action

5.

A second vacuum pump was started and a search for leaks initiated.

When found, the leaking fittings on the containment radiation monitoring system were tightened.

As the containment bulk average temperature reached equilibrium, the containment vacuum system brought the partial pressure with-in the limits and the second vacuum pump was returned to standby.

Subsequent Corrective Action No further corrective action was required.

6.

Actions Taken to Prevent Recurrence A modification to improve containment cooling systems has.been initiated, approved, and is planned for installation during the Steam Generator Replace-ment,Outage.

During periods of high service water temperature (>87°), con-

. tainment pressure, temperature and service water conditions are.monitored

Surry Power Station, Unit 2

,,, r!ocket No: 50-281 Report No: 78-028/03L-0 Event Date: 08-03-78 Title of Report:

Containment Partial Pressure (Continued)

7.

on a more frequent interval.

Generic Implications None

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