ML19309F152

LER 80-036/03L-0:on 800330,during Performance of Preoperational Test,Control Room Bottled Air Sys Inadvertently Actuated & Pressure Depleted Below Tech Spec Limit.Caused by Improper Procedure Instructions

ML19309F152
Person / Time
Site:	North Anna
Issue date:	04/25/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19309F149	List: ML19309F148 ML19309F152
References
LER-80-036-03L, LER-80-36-3L, NUDOCS 8004280554
Download: ML19309F152 (2)

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and the pressure depleted below the Technical Specification limit of 2300 psia. I g lSince the bottled air system was recharged and restored to operable status within I l o Is i (the 7 day ACTION statement of T.S. 3.7.7.1, the healeh and safet" of -ka nne vn 1 I go,7; l room personnel and the general public were not affected. This event is rariort able I lotsIIpursuant to T.S. 6.9.1.9.b. I 7 3 3 8.

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,, , o ; [rhe air banks depressurized because the test procedure did not instruct the g i i performer to manually isolate the system prior to initiating the SI signal nor  :

, )iid it mention to reset the automatic dump valve SOV's upon reset of the SI signal.l lijstICnrroctivo action was to rocharan the bottled air system to its required Technical l tital Igrn-4r4-,+ inn 14 4 - w i ,-k i n +ko ,11nwod ti-a of the arnrnnriato ACTTnN eatemant. I

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Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 80-36/03L-0 Description of Event On March 30, 1980, with the unit at 100% power, the control room bottled air system (shared with Unit 2) was inadvertently actuated and depressurized below the Technical Specification limit of 2300 psig when a Safety Injection Signal was initiated during the performance of a preoperational test on Unit ,

2. This event is contrary to T.S. 4.7.7.2.a and reportable pursuant to T.S. '

6.9.1.9.b.  ;

Probable Consequences of Occurrence The purpose of the control room bottled air system is to provide compressed dry air for pressurization and occupant breathing during emergency situations.

With insufficient air pressure present, the system would be unable to maintain the control room and relay rooms at a positive interior pressure to assure outward leakage when the outside air is contaminated. Because the air banks were immediately recharged and the system was restored to operable status within the 7 day time limit allowed by the ACTION statemect of T.S. 3.7.7.1, the health and safety of the control room personnel and the general public were not affected. There are no generic implications associated with this event. I I

Cause of Event  !

The bottled air system was depressurized as a result of a defective Unit 2 test procedure. The procedure in question called for the initiation of a Safety Injection Signal; however, did not instruct the performer to isolate the bottled air system prior to initiation of the signal nor did it instruct him to reset the automatic dump valve control SOV's following the reset of the initiated SI Signal.

Immediate Corrective Action The bottled air pressurization system was recharged to its required Technical Specification limit within the time allowance of the appropriate ACTION statement.

Scheduled Corrective Action No scheduled Corrective Action is required.

Actions Taken to Prevent Recurrence Because the Unit 2 procedure is a preoperational test which is to be performed only once, no further actions are required.

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