05000280/LER-1980-023, Forwards LER 80-023/01T-0

Forwards LER 80-023/01T-0

ML18139A184
Person / Time
Site:	Surry
Issue date:	04/30/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A185	List: 05000280/LER-1980-023, Forwards LER 80-023/01T-0 05000280/LER-1980-023-01, /01T-0:on 800417,during Valve Insp,Discovered That Seat Was Detached in Valve 1-FW-27 & Disc Was Detached in Valve 1-FW-89.Cause of Detached Seat Unknown.Detached Disc Caused by Improper Cotter Pins
References
NUDOCS 8005060174
Download: ML18139A184 (2)

LER-1980-023, Forwards LER 80-023/01T-0

Event date:
Report date:
2801980023R00 - NRC Website

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VIRGINIA ELECTRIC AND POWER COMP A Surry Power Station P. 0. Box 315 Surry,Virgin.ia 23883 APR 3 0 1980-Ur~ James* P. O'Reilly, Director Office of Inspection and Enfo11cement U.S. Uuclear Regulatory-Commission Region II*

101 Marietta Street, Suite 3100 Atlanta, Georgia 30303

Dear Hr. O'Reilly:

Seri.al No.* 003 Docket Nos:_ 50-280 License Nos: DPR-32 Pursuant to Surry Power Station Technical Specifications,.the Virginia.

' Electric and Power Company hereby submits the 'following Licensee -Event Report for Surry lJnit No. 1.

• Report No.

80-23/0lT-0 Applicable Technical Specification 6.6.2.a.5 This report has been reviewed by the Station Nuclear Safety and_

. Operating Col!IIl1ittee and,rill be placed on the agenda for the next

-. meeting of the _Systel!l., Huclear Safety and Operating Committee Enclosure cc:

Hr. Victor.Stello, Director (3)

Office of Inspection and Enforcement

-* Ur. _Noman Haller, Di~ector (3)

Office of Hanagement-and Program.Analysis

_;1ll(;;L'

' :il*.. tru:,~

,.J 7t. _

w son f,-cJ,"'

Station Uanager

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AT'fACHMENT (PAGE 1 of 1)

A SUltRY POWER STATION, UNIT 1 '1111' DOCKET NO:

50-280 REPORT NO:

80-023/0lT-O EVENT DATE:

4-17-80 TITLE OF EVENT:

AUX.

FEED CHECK VALVE FAILURE

1.

DESCRIPTION OF EVENT

During an inspection of the internal parts of valves 1-FW-27 and l-FW-89, it was discovered that the seat was detached in l-FW-27 and disc was detached in l-FW-89.

This event is reportable in accordance with Technical specification 6~6.2.a.5.

2.

PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT SYSTEMS:

The detached seat and.disc would have prevented these valves from fulfilling their intended function.

In addition the loose parts could have become wedged in the valve body becoming a blockage and causing a reduction in feedwater flow.

Since the problem occurred after the plant was brought to cold shutdown, the health and safety of the general public were not affected.

3.

CAUSE

At this time the cause for the detached seat in l-FW-27 is unknown and is under investigation.

The cause for the detached disc in l-FW-89 is attributed to improper material for the disc retaining nut cotter pin (carbon steel v. s.-,.sj:ainless steel).

The carbon steel cotter pin apparantly deteriorated to the point of failure permitting the retaining nut to loosen until the valve disc detached.

4.

IMMEDIATE CORRECTIVE ACTIONS

The two valves were repaired and stainless steel cotter pins were utilized.

5.

SUBSEQUENT CORRECTIVE ACTIONS:

The remaining check valve in Unit l; l-FW-58; was inspected and found operable, although the disc retaining nut cotter pin was missing.

The valve was repaired utilizing a Stainless Steel Cotter Pin.

The three check valves.in Unit 2; 2-FW-27,58,89; were inspected and found to be fully operable with stainless steel pins installed.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

The detached seat in l-FW-27 is under investigation and a follow-up will be submitted when the results are known.

7.

GENERIC IMPLICATIONS:

Following the inspection of the *Uni*t.1 _valy~~,the Unit 2 valves were inspected and found fully operational with stainless steel pins installed and therefore this is not considered a generic problem.