05000280/LER-1980-039-03, /03L-0:on 801102,satisfactory Control Room Pressure Envelope Test Could Not Be Established.Caused by Slippage of Clamp Holding Operating Arm of Damper Preventing Full Closure.Arm Adjusted

/03L-0:on 801102,satisfactory Control Room Pressure Envelope Test Could Not Be Established.Caused by Slippage of Clamp Holding Operating Arm of Damper Preventing Full Closure.Arm Adjusted

ML18139A880
Person / Time
Site:	Surry
Issue date:	12/02/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A878	List: 05000280/LER-1980-039-03, /03L-0:on 801102,satisfactory Control Room Pressure Envelope Test Could Not Be Established.Caused by Slippage of Clamp Holding Operating Arm of Damper Preventing Full Closure.Arm Adjusted ML18139A877
References
LER-80-039-03L-01, LER-80-39-3L-1, NUDOCS 8012050378
Download: ML18139A880 (2)

LER-1980-039, /03L-0:on 801102,satisfactory Control Room Pressure Envelope Test Could Not Be Established.Caused by Slippage of Clamp Holding Operating Arm of Damper Preventing Full Closure.Arm Adjusted

Event date:
Report date:
2801980039R03 - NRC Website

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j\\./ith the Unit at 50 percent reactor power and stable, Operations was unable to estabJisbl a satisfactory Control Room Pressure Envelope Test.

The Control Room Emergency Ventilation System is required by T.S.3.19 to be able to maintain a.05 in. pressure differential*.

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The health and safety of the public were not affected.

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EVENT DATE:

• so.:::2s1 80-039/03L-O 11-02-80 CONTROL ROOM EMERGENCY VENTILATION SYSTEM

1.

DESCRIPTION OF EVENT

Operations was unable to establish a satisfactory control room pressure differential while performing MOP. 21. 3, control room and relay room operational pressure test. Investigation revealed that damper MOV-VS-104B was not fully closed.

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

The MOP was deviated to use this damper and the associated fan, 2-VS-F-41, to verify compliance with Technical Specification 3.19.B~

2.

PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT EQUIPMENT:

As shown by the testing of the emergency ventilation system, the air bottles would not have been able to maintain the required pressure differential.

However, the control room and relay room pressure was maintained by the emergency ventilation system (T.S.3.~9.B).

The health and safety of the public were not affected.

3,

CAUSE

The clamp holding the damper's operating arm had slipped.

4.

IMMEDIATE CORRECTIVE ACTION

Verified that the control room emergency ventilation system was functional, as required by Technical Specification 3.19.B.

5.

SUBSEQUENT CORRECTIVE ACTION:

Adjusted MOV-VS-104B to insure full closure, and subsequently performed a satisfactory Control Room Pressure Test.

6.

ACTION TAKEN TO PREVENT RECCURANCE:

None required.

7.

GENERIC IMPLICATIONS:

None.