ML18127A668

LER 1978-012-00 for St. Lucie Unit 1, on 04/16/78 Concerning Eddy Current Testing Performed on Fuel Assembly CEA Guide Tubes at Unit 1 Showed Near in Guide Tubes Where Tips of Fully Withdrawn CEAs Were Located

ML18127A668
Person / Time
Site:	Saint Lucie
Issue date:	04/28/1978
From:	Schmidt A Florida Power & Light Co
To:	O'Reilly J NRC/IE, NRC/RGN-II
References
PRN-LI-78-124 LER 1978-012-00
Download: ML18127A668 (5)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS )

DISTRIBUTION FOR INCOMING MATERIAL 50-335 REC: OREILLY J P ORG: SCHMIl3T A D DOCDATE: 04/ 28/78 NRC FL PMR Cc LIGHT DATE RCVD: 05/09/78 DOCTYPE: LETTER NOTAR1 ZED: NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 1 FORWARDING LICENSEE EVENT REPT (RO 50-335/78-12) ON 04/16/78 CONCERNING EDDY CURRENT TESTING PERFORMED ON FUEL ASSEMBLY CEA GUIDE TUBES AT UNIT 1 SHOWED NEAR IN THE GUIDE TUBES WHERE THE TIPS OF THE FULLY WITHDRAWN CEA "S MERE LOCATED.

PLANT NAME: ST LUCIE Si REVIEWER INITIAL: XJM DISTRIBUTOR INITIAL:

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FLORIDA POWER 5 LlGllT COMPANY April 28, 1978 PRN-LX-78-124 ro CD n CDl" KP

~QJ CQ 2~K CD na rn-Mr. James P. O'Reilly, Director, Region II X~~+ CD CD~

Office of Inspection and Enforcement ~ re A7 CD U. S. Nuclear Regulatory Commission n 230 Peachtree Street, N.N., Suite 1217 ED m

C/l Atlanta, Georgia 30303

Dear Mr. O'Reilly:

REPORTABLE OCCURRENCE 335-78-12 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: APRIL 16, 1978 TECHNXCAL SPECIFICATION 6.9.1.8.i CEA GUIDE TUBE NEAR The attached Licensee Event. Report is being submitted in accordance with Technical Specification 6.9 to provide prompt notification of the subject occurrence.

Very truly yours, PMD. Schmidt Vice President Power Resources MAS/mb Attachment cc: Robert Lowenstein, Esquire Director, Office of Inspection and Enforcement (40)

Director, Office of Management Information and Program Control (3) 78130009l PEOPLE... SEFlVING PEOPLE

LlCENSEE EVENT REPORT

~s term CONTROL BLOCK: GE PRINT ALL REGUIREO INFORMATION) cg r r 1 6 s ~

UCENSEE UCENSE EVENT NAME UCENSE NUMSER TYPE TYPE

~01 1' L S L S 1 0 0 0 0 0 0 0 0 0 4 1 1 1 1 ~01 89 14 15 25 26 30 31 32 REPORT AEPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT DATE REPORT DATE

~o~ comu' 2 0 5 0 OI3 3 5 0, 4 1 6 7 8 0 4 2 8 7 8 7 8 57 56 59 60 61 68 69 74 75 60 EVENT DESCRIPTION Q~ 2 Due to reports of CEA uide tube wear from other licensees, Edd Current Testin FCT 7 8 9 --80

[Ogg was performed on fuel assembly CEA guide tubes at St. Lucie Unit l. All assemblies I

7 89 80

[OD4] which had been under CEAs in Cycle 1 were tested. Based on the results of that testin,p 7 8 9 60 more detailed ECT was oerformed on 22 assemblies. ECT has shown that ther'e is wear'n 7 8 9 60 Ioa~] the guide tubes where the tips of the full withdrawn CEAs were located. The wear ma 7 8 9 PRME eo SYSTEM CAUSc CCMPCNENT CCMPCNENT 7

toQQ7 8 9 10

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CODE 11 12 F

COMPONENT COOS U E L X X 17 SUFP1 rER N C MAfeUF~i AER 4 9 0 47 VolATX)N N

48 CAUSE DESCRIPTION Qg -

The aooarent cause is flow induced vibration of the CEA fin ers. A detailed re ort 7 89 eo ICOI discussin the rohle'm and its solution s rrill he submitted to the NRC to su ort 7 8 9 60 Qg startun and power operation. The report will be submitted in lieu of a supplementary 7 89 FACtUTY METHOD OF 80 STATUS POWER OTHER STATUS OLSCOVERY D1SCOVERY OESCAlPTlCN Jig ~a ~oo '

N/A ~c Information from other Licensees 7 8 9 10 12 13 44 45 46 60 FOAM OF ACTlVlTY CONTENT AELEASEO OF AELCASE AMOUNT GF A TlV1TY LOCATION OF RELEASE

~z ~z N/A N/A 2 S S 10 11 PERSONNEL EXPOSURES NUMBER TYPE OcSCA1PTlON Qa] ~oo o z N/A 7 8 9 11 12 13 80 PERSONNEI INJURIES NUMSER DESCAlPTlON 7

H 89 I LD Lol nl N A 11 12 80 PROBABLE covsECUENces N/A 7 89 60 LOSS OR DAMAGE TO FACILITY TYPE CESCA:PT(QN N/A 7 89 10 60 PU8LICITY N/A 7 89 .Bo ADDITIONAL FACTORS

~r s Sae page 2 for, continuation of Event and Cause Descriptions.

7 89 80 Q~g 7 89 ,60 H. A. Schoppman ;305-552-3802 PHONE'

,REPORTABLE OCCURRENCE 335-78-" 12 LICENSEE EVENT REPORT PAGE TMO EVENT DESCRIPTION Continued) have resulted in through-wall penetrations in some cases.

Although the final reduced data is not yet available, testing has shown that up. to 6 assemblies will require special handling.

Stainless steel sleeves with a chrome plated wear surface either have been ox will be installed in all assemblies which will be used under CEAs in Cycle 2 and in some or all of the 22 assemblies which received detailed ECT analysis.. Only 1 assembly which was under a CEA in Cycle 1 will be under a CEA in Cycle 2. This assembly will be chosen based on minimum wear considerations.

The NSSS vendor has provided the NRC with detailed reports for other licensees who have experienced guide tube wear, and is of the opinion that any guide tube wear observed at St. Lucie Unit will bc bounded by (or will be less serious than) the observations1 and analyses for the other licensees.

CAUSE DESCRIPTION (Continued)

Licensee Event Report by about iiay 1, 1978. The report is entitled "St. Lucie Unit 1 Reactor Operation with >Iodified CEA Guide Tubes" and is numbered CEN-90(F)-P.