05000281/LER-1981-016-03, /03L-0:on 810119,at 100% Power,Positive Pressure Greater than 0.05 Inches Water Could Not Be Maintained in Control Room.Caused by Deteriorated Seals on Door to Control Room Complex.Defective Doors Repaired

/03L-0:on 810119,at 100% Power,Positive Pressure Greater than 0.05 Inches Water Could Not Be Maintained in Control Room.Caused by Deteriorated Seals on Door to Control Room Complex.Defective Doors Repaired

ML18139B096
Person / Time
Site:	Surry
Issue date:	02/18/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B095	List: 05000281/LER-1981-016, Forwards LER 81-016/03L-0 05000281/LER-1981-016-03, /03L-0:on 810119,at 100% Power,Positive Pressure Greater than 0.05 Inches Water Could Not Be Maintained in Control Room.Caused by Deteriorated Seals on Door to Control Room Complex.Defective Doors Repaired
References
LER-81-016-03L-01, LER-81-16-3L-1, NUDOCS 8102260535
Download: ML18139B096 (2)

LER-1981-016, /03L-0:on 810119,at 100% Power,Positive Pressure Greater than 0.05 Inches Water Could Not Be Maintained in Control Room.Caused by Deteriorated Seals on Door to Control Room Complex.Defective Doors Repaired

Event date:
Report date:
2811981016R03 - NRC Website

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I On January 19,1981, with Unit No. 2 at 100,~ *pq,;~er, a positive pressure of greater [2J}J than 0.05 inches of water, could not be maintained in the control room.

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ATTACHMENT I SURRY POWER DOCKET NO:

REPORT NO:

EVENT DATE:

e STATION, UNIT 2 50-281 81-016/03L-0 1-19-81 TITLE:

EXCESSIV(_E CONTROL ROOM LEAKAGE

1.

DESCRIPTION OF EVENTS:

On January 19,1981, with Unit No.2 at 100% power, MOP-21.3 was performed to verify the integrity of the Control Room pressure boundary following the breaching of the boundary.

A positive pressure, of greater than 0.05 inches of water, could not be maintained in the control room.

This is contrary to Technical Specification 3.19.A and is reportable per Technical Specification 6.6.2.b(2).

A satisfactory MOP-21.3 was performed 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> later.

2.

PROBABLE CONSEQUENCES and STATUS of REDUNDANT EQUIPMENT:

The requirement of 0.05 inches of water insures that the integrity of the control room is such that the bottled air system will prevent the in leakage of radioactive material for a period of one hour during a LOCA.

The emergency ventilation system was operable and the control room pressure boundary was returned to a satisfactory condition within the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Tech. Spec. time limitation. Therefore, the health and safety of the public were not affected.

3.

CAUSE

The seals on the doors to_ the control room, battery room, and No. 2 cable vault had deteriorated due to excessive contractor usage while._performing Fire Protection and THI Modificatians.

4.

IMMEDIATE CORRECTIVE ACTION

Verified the emergency ventilatioµ system to be functional.

Initiate an investigation to determine the source of leakage.

5.

SUBSEQUENT CORRECTIVE ACTION:

The defective doors were identified and repaired.

6.

ACTION TAKEN to PREVENT RECURRENCE:

The continued performance of the MOP and frequent use of the check list for door

eals will minimize the length of time inadvertent damage goes undetected.

7.

• GENERIC IMPLICATIONS:

• None.

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