05000338/LER-1980-092-03, /03L-0:on 801030,water Found Leaking from Weld Joint Connecting Drain Valve 1-CH-497 to Piping That Tees Into Suction Line of Charging Pump 1-CH-P-1A.Caused by Bad Weld.Weld Ground Out & Rewelded Per Approved Procedures

/03L-0:on 801030,water Found Leaking from Weld Joint Connecting Drain Valve 1-CH-497 to Piping That Tees Into Suction Line of Charging Pump 1-CH-P-1A.Caused by Bad Weld.Weld Ground Out & Rewelded Per Approved Procedures

ML19345B867
Person / Time
Site:	North Anna
Issue date:	11/24/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345B860	List: 05000338/LER-1980-092, Forwards LER 80-092/03L-0 05000338/LER-1980-092-03, /03L-0:on 801030,water Found Leaking from Weld Joint Connecting Drain Valve 1-CH-497 to Piping That Tees Into Suction Line of Charging Pump 1-CH-P-1A.Caused by Bad Weld.Weld Ground Out & Rewelded Per Approved Procedures
References
LER-80-092-03L-01, LER-80-92-3L-1, NUDOCS 8012020631
Download: ML19345B867 (2)

LER-1980-092, /03L-0:on 801030,water Found Leaking from Weld Joint Connecting Drain Valve 1-CH-497 to Piping That Tees Into Suction Line of Charging Pump 1-CH-P-1A.Caused by Bad Weld.Weld Ground Out & Rewelded Per Approved Procedures

Event date:
Report date:
3381980092R03 - NRC Website

text

o i

U.S. NUCLEAR REGULATORY COMMISSION

' LICENSEE EVENT REPORT CONTROL-BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

/0/1/

/V/A/N/A/S/1/ (2)

/0/0/-/0/0/0/0/0/-/0/0/ (3)

-/4/1/1/1/1 (4)

/ / / (5)

LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

/0/1/

REP

/L/ (6)

/0/5/0/0/0/3/3/8/ (7)

/1/0/3/0/8/0/ (8) ~ /1/1/ 2/ 4/ 8/ 0/ (9) 9, DOCKET NUMLER-EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

./0/2/

/

On October 30, 1980, with the unit in Mode 1, water was found leaking from a

/

/0/3/

/

weld joint that connects drain valve 1-CH-497 to piping that tees into the suc-/

/0/4/

/

tion line of charging pump 1-CH-P-1A.

The leak was immediately isolated, char-/

/0/5/

/

ing pump 1-CH-P-1A was declared inoperi ' and an Emergency Maintenance Report /

/0/6/

/

was submitted. Since two charging pumps were operable the health and safety of/

/0/7/

/

the general public were not affected. This event is reportable pursuant to

/0/8/

/

T.S. 6.9.1.9.d.

/

SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/

/P/C/ (11) [B[ (12) [C[ (13) /P/I/P/E/X/X/ (14) /A_/ (15)

[Z/ (16)

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

CODE TYPE NO.

(17) REPORT NUMBER

/8/0/

/-/ /0/9/2/

/\\/

/0/3/

/L/

[-[

/0/

ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TA:EN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

/B/ (18) /Z/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) /Y/ (23) /N/.(24) [A[ (25) /S/4/2/0/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/

/

A bad weld at the base of a vent valve on the charging pump developed a leak.

/

/1/1/

/

The weld was ground out and rewelded as per approved procedures.

/

/1/2/

/-

/

/1/3/

/

/

/1/4/

/

/

FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION (32)

-/1/5/

/E[ (28)

/1/0/0/ (29) /

NA

/ (30) /AL (31) / Operator Observation

/

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

/1/6/

[Z[ (33)

[Z[(34) /

NA

/

/

NA

/

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) LZL (38) /

NA

/

PERSONNEL INJURIES NUMBER

. DESCRIPTION (41)

/1/8/ /0/0/0/ (40) /

NA

,/

LOSS OF OR DAMAGE TO FACILITY (43)

TYPE

- DESCRIPTION

/1/9/'

[ZL (42) /-

NA

/

PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

-/2/0/

LNL-(44) /'

NA

/////////////

NAME OF PREPARER-

- W.

R. CARTWRIGHT-PHONE (703) 894-5151 IO120s0631

- a Virginia Electric and Power Chmpany North Anna: Power Station,_ Unit 1 Attachment: Page 1 of 1 Docker No. 50-338

' Report No. IIR 80-092/03L-0

Description of Event

On_0ctober 30, 1980, with the Unit in Mode 1, water was found leaking from a weld _ joint that connects drain valve 1-CH-497 to piping that tees into the suction line of charging pump 1-CH-P-1A.

Probable Consequences of-Occurrence Upon discovery of the leak the piping was isolated and charging pump 11-CH-P-1A was declared inoperable. Since there'were two charging pumps operable the health and safety of the general public were not '

affected.

Cause of Event

The actual cause of a crack developing near the center of the weld material is unknown at this_ time.

This crack may have been caused by improper fit-up of. pipe to the socket weld fitting and by vibration from the charging pump.

Immediate Corrective-Action The leak was immediately isolated, charging pump 1-CH-P-1A was declared inoperable and an Emergency Maintenance Report was submitted.

The weld was ground out, repaired and liquid penetrant inspected by approved welding procedures.

Scheduled Corrective Action None scheduled at this time.

Actions Taken to Prevent Reccurrence 1

None scheduled at this time.

Generic Implications We have experienced several failures of this kind r'_cently-and are investigating into the cause of these. welding failures.

9