05000338/LER-1981-055-03, /03L-0:on 810706,during Normal Operations,Control Room Bottled Air Pressurization Sys Fell Below Required Pressure of 2300 Psig.Inadvertent Safety Injection on Unit II Caused Both Banks of Unit I Bottles to Depressurize

/03L-0:on 810706,during Normal Operations,Control Room Bottled Air Pressurization Sys Fell Below Required Pressure of 2300 Psig.Inadvertent Safety Injection on Unit II Caused Both Banks of Unit I Bottles to Depressurize

ML20009G691
Person / Time
Site:	North Anna
Issue date:	07/24/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009G678	List: 05000338/LER-1981-055, Forwards LER 81-055/03L-0 05000338/LER-1981-055-03, /03L-0:on 810706,during Normal Operations,Control Room Bottled Air Pressurization Sys Fell Below Required Pressure of 2300 Psig.Inadvertent Safety Injection on Unit II Caused Both Banks of Unit I Bottles to Depressurize
References
LER-81-055-03L, LER-81-55-3L, NUDOCS 8108040555
Download: ML20009G691 (2)

LER-1981-055, /03L-0:on 810706,during Normal Operations,Control Room Bottled Air Pressurization Sys Fell Below Required Pressure of 2300 Psig.Inadvertent Safety Injection on Unit II Caused Both Banks of Unit I Bottles to Depressurize

Event date:
Report date:
3381981055R03 - NRC Website

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^ LICENSEE EVENT REPORT CONTROLEBLOCK /-/=/ / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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. EVENT DESCRIPTION AND PROBABLE CONSEQUENCES'(10)

/0/2/ ?/-On July 6' 1981, with Unit 1 in mode'l at-100% power the control room bottled air /

~/0/3/1 '/. pressurization ~ system fell below the required minimum pressure of 2300 PSIG.

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210/4/: - / Since ' the air bottles were repressurized to the required pres sure within the t'ine/ -

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/ limits 'of technicial specifications,~ the public health and safety were not af

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CAUSE

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COMP.

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CODE SUBCODE COMPONENT CODE SUBCODE SUBG0DE

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SEQUENTIAL OCCURRENCE REPORT-REVISION LER/R0~ EVENT YEAR REPORT NO.

CODE TYPE' NO.

(17) REPORT NUMBER

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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/ The' inadvertent safety injection on Unit 2 (in Mode 5 at the time) caused both

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/ banks of the Unit I bottles to depressurize to approximately 2290 PSIG. Safety /

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/ injection was reset and the recharging of the bottles commenced.

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS

/ (30)MSCOM MSCOVERY DESNION (32)

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Operator Observation

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ACTIVITY CONTENT RELEASEU OF RELEASE AMODIT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

[1/6/ ' PERSONNEL EXPOSURES

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PERSONNEL INJURIES NUMBER

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LOSS OF CR DAMAGE.TO FACILITY (43) 1 TYPE'

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F PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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' 8108040555 810724M OF PREPARER W. R. CARTWRIGHT-PHONE (703) 894-5151

'. PDR ADOCK 05000338-

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

. Attachment: Page 1 of 1 Docket No. 50-338

- Report No. LER 81-055/03L-0

Description of Event

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un July 6, 1981, with Unit 1 in Mode 1 at 100% power, the control-room bottled air pressurization system pressure fell to 2290 PCIG which is below the required minimum of 2300 PSIG. This event is contrary to T.S. 3.7.7.1 and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence Since the air bottles were repressurized to the pressure required by technicial specifications with the time limits of the action statement (seven day action statement, pressure was brought greater than 2300 PSIG within two hours), the public health and. safety were not affected.

Cause of Event

This event was caused by an inadvertent safety injection on Unit 2 (in mode 5 at the time). Further depressurization of the air bottles das prevented by resetting the bottled air system discharge signal in the control room.

Immediate Corrective Action

Safety injection was reset and the air bottles were repressurized to the technicial specification limit within two hours.

Staeduled Corrective Action No scheduled corrective action required.

f-Actions Taken to Prevent Recurrence i

No further actions required.

Ceneric Implications There are no generic implications to this event.

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