ML20027B462

LER 82-009/01T-0:on 820804,during Refueling Insp of Reactor Coolant Pump,Five Closure Studs Found Degraded in Size Below Tech Spec Min.Caused by Boric Acid Corrosion Due to Closure Gasket Leakage.Studs Replaced

ML20027B462
Person / Time
Site:	Oconee
Issue date:	09/10/1982
From:	Petty J DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027B461	List: ML20027B460 ML20027B462
References
LER-82-009-01T-01, LER-82-9-1T-1, NUDOCS 8209210048
Download: ML20027B462 (1)

Text

y oe s

N C FORM 366 U.S. NUCLE AR R EGULATOR Y COMMISSION APPROVED BY OME l'"

LICENSEE EVENT REPORT $'EPIAEE4ao4:

(PLEASE PRINT On TYPE ALL REQUIRED INFoRMATioN)

CONTROL BLOCK: l l l l l l @

jol,llSlClNlElEl 3lgl 0 l 0l -l 0 l LICENSE 7 8 . LIC EN.E E CODE 14 1.

0 l 0[NUMSER 0l 0 l -l 0 l0 lg[4 {1l1 l1 l 1lgl

3. 3. JCENSE TTPE 3.

l

,, CAT ..

lg CON'T l o l1 l R;;aR; l Ll@l 0 l 5 l 0 l 0l 0 l 2 l 8 l 7 l@l 0 l 8 l 0 l 4 l 812 l@l 0l 9l ll 0 l 8 l 2l@

y e 6. et DOCM ET NUMBER .. .. EVENT D ATE 14 1. R EPORT D ATE s.

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l 0 l2 l lDurinc a refuelinn insnection of Reactor Coolant Pimn (PCP) closuro grud nn l lol3ll August 4, 1982 at 1000, it was determined that five closure studs, two on 3Al l lo l4 l land three on 3A2, on Unit 3's RCPs had been degraded in size below the minimum l

,,,,;l acceptable diameter of 3.250 inches. This was reportable per T.S. 6.6.2.1.a. (9)[.

lo16ll l lol7Il I lolall l

'=" ca": 5::"::E C.M P.N E N, C..E S::::.E 5 ":n:E loisl Ic IB le i El@ l Dl@ lXl Xl XlX lXl Xl@ lZ l@ l Zl@

. i. ., ,, ,, i. .. ..

-E T E NT T E A.  :':::T "T. "M "' " "!.':.' "

@LER/ROR,go,R; l8 l2 ul l-l l 01019 l l/l l 0l ll IT l l-l J u

... n u ., .. .. .. ,,

= :" = ::  :::=, ==" N..RS  :::=n' P:::=.. ' = = - .:::::,=RS

[d@y @ l Zl@ l Zl@ l 0 j 0 l 0@l 0l [Nj @l Nl Q l Lj @ l Bl2 l6 j 5 l 33 34 5. 34 3, 4. 41 42 45 44 er CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o l lThe closure studs degraded because of boric acid corrosion due to a closure l

, ,,;g gasket leakage. The studs were replaced by a more corrosion resistant material.l l i l 2 l lThe closure stud inspection procedure will be reviewed to determine if it needs l l i l 3 l l to be revised to specify the stud position to be measured. [

l114ll u l

STAT S  % PO W E R OTNER ST ATUS DISCOV E R T Of SCOVERT DESCRIPTION l 1i s l l Ill g l 0 l 0l 0 lgl NA l l Bl@l Refueling inspection j

> .. i. . u u REL SED RELEASE AMOUNT OF ACTivlTT LOC ATION OF R E LE A SE Iil61lZl@lZl@l

, .. i. n NA u

l l NA l

NUMBER TYPE D E S C R IPTIO N l 1l 7 l l0 l 0 l 0 lg]gl NA l PERSON EL _ R,.S g

l il 8 ..

l l0 l 0 l 0nl@lu NA l TYPE DESCR PT ON NA l lil9IlZl@l l

l P U . u C ,,, 8209210048 820910 NRC usE ONLY

! '""*" * * * * " '"'a " @ PDR 6 ADOCK 05000287 I2lollNl@l NA pan lllllllllllll NAME OF PREPARER PHONE:

[

- - .