05000338/LER-1981-040-03, /03L-0:on 810301,during 18-month Periodic Test to Verify Setpoints of Pressurizer Safety valves,SV-1551A & B Relieved at Pressure Below Acceptable Band.Caused by Setpoint Drift.Setpoints Reset & Verified Acceptable

/03L-0:on 810301,during 18-month Periodic Test to Verify Setpoints of Pressurizer Safety valves,SV-1551A & B Relieved at Pressure Below Acceptable Band.Caused by Setpoint Drift.Setpoints Reset & Verified Acceptable

ML20004D524
Person / Time
Site:	North Anna
Issue date:	06/03/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004D520	List: 05000338/LER-1981-040, Forwards LER 81-040/03L-0 05000338/LER-1981-040-03, /03L-0:on 810301,during 18-month Periodic Test to Verify Setpoints of Pressurizer Safety valves,SV-1551A & B Relieved at Pressure Below Acceptable Band.Caused by Setpoint Drift.Setpoints Reset & Verified Acceptable
References
LER-81-040-03L, LER-81-40-3L, NUDOCS 8106090494
Download: ML20004D524 (2)

LER-1981-040, /03L-0:on 810301,during 18-month Periodic Test to Verify Setpoints of Pressurizer Safety valves,SV-1551A & B Relieved at Pressure Below Acceptable Band.Caused by Setpoint Drift.Setpoints Reset & Verified Acceptable

Event date:
Report date:
3381981040R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK L,/ / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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E DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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/ On March 1, 1981, while performing the 18 month periodic test to verify the set- /

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/ points of the pressurizer safety valves, SV-1551A and B both relieved at a press-/

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SYSTEM

CAUSE

CAUSE COMP.

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUF^.CTURER

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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NRC USE ONLY

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NAME OF PREPARER W. R. CARTbRIGHT PHONE (703) 894-5151 810 6 09 0 ap9

Virginia Electric an! Power Company North Anna Power Station, Unit 1 Attachment: Page 1 of 1 Docket No. 50-338 Report No. LER 81-040/0?,L-0

Description of Event

The 18 month periodic test (1-PT-50) was performed on March 1,1981 during a refueling shutdown. During this test SV-1551A lifted at 2290 psig and SV-1551B lifted at 2450 psig. The acceptance criteria specified in T.S. 3.4.2 and in 1-PT-50 i_s_2485 psit 1%. The reportability of this event was not determined until May 20, 1981 when the SNSOC was reviewing the deviation report subsequent to the management review.

Howevar, the event was subsequently determined to be reportable pursuant to T.S. 4.0.5.

Probable Consequences of Occurrence The purpose of the pressurizer code safety valves is to prevent' '

reactor coolant system pressure from exceeding 110% of system design pressure. Because the valves were set to relieve at a pressure-lower ~

than desired (which is cctually more conservative), the health 3gd_aafety of the public were not affected.

Cause of Event

The setpoints of the safety valves 4 -if ted low.

Immediate Corrective Action

The relief setpoints for safety valves SV-1551 A and B were readjusted and verified acceptable by retest.

Scheduled Corrective Action No further actions are required.

Actions Taken to Prevent Recurrence No further actions are required.

Generie Implications This event is generic to North Anna Units 1 and 2.