ML18113A439

LER 1976-09-00 for St. Lucie Unit 1, Mechanical Pipe Restraints Supplementary Report No. 1

ML18113A439
Person / Time
Site:	Saint Lucie
Issue date:	06/10/1976
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/IE, NRC/RGN-II
References
PRN-LI-76-143 LER 1976-09-00
Download: ML18113A439 (14)

Text

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~t FILE NUMOL'll NBC DISTBIOUTION Fol I ART 50 DOCKET MATERIAL INCIDI',NT REPORT N.C. Mgs'eley FRoM:Flordia Power. 8'ight Co. DATE OF DOCUMENT Miami, Flordia 6-10-76 A.D. Schmidt DATE RECEIVED 6-17-.76 QLCTTEA ONOTOAIZGD PROP INPUT FOAM NUMOGA OF COPIES AGCEIVFD QOAIGINAL

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@UNCLASSIFIED EICOPV DESCRIPTION ENCLOSURE Ltr.. trans the Licensee Event Report (R.O. 76-9) on.,3-31-76

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Concerning Mechanical Pipe Restraints Supplementary Report 81 .......

(30 Carbon Signed Cys. Received)

(4 Page's)

ACKNOWLEDGED, .

D>>OT aZMOVz PLANT NAME: St. Lucie 8 1 NOTE: IF PERSONNEL EfiPOSURE XS 'INVOLVED.,

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'~>>' >~I.:.','a.l. ///yygx-FLORIDA POVsER B LiGHT GOl:> <<t!Y cg//g~ June 10, 1976 Co~ 1$R Rg0I 77 PRN-LI-76-143 5gpN I0RL Mr. Norman C; Moseley, Director, Region II 00CKOEO Office of Inspection and Enforcement VS'>P U. S. Nuclear Regulatory Commission 230 Peachtree Street, N. N., Suite 818. 5oel'>>>>>

Atlanta, Georgia ,30303 gob~ C4>I>,

Dear Mr. Moseley:

REPORTABLE OCCURRENCE 335-76-9 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: MARCH 31'976 MECHANICAL PIPE RESTRAINTS SUPPLEMENTARY REPORT NO. 1 The attached Licensee Event Report is being submitted to supplement our initial report of April 12, 1976.

Very truly yours, Vice President Power Resources MAS/cpc At tachment cc: Jack R. Newman, Esquire

-Director, Office of. Inspection and Enforcement (40)

Director,.- Office of Management Information and Program Control (3)

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LICENSEE EVENT REPORT CONTROL BLOCK: Sf PRINT ALL RfQUIRE 0 INFORMATION) 1 6

. UCENSEE UCENSE EVENT

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~01 FLSLZ1 0 0 00000 UCENSE NUMBER 00 41 TYPE 1 11L000~1I TYPE

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7 89 14 15 25 26 30 31 32 REPOAT, REPORT CATEOORY TYPE SOURCE OOCKET NUMBER ~ EVENT OATC AEPORT OATE

[001j coN'r T ~L 0 5 0 0 3 3 5 0 3 3 1 7 6 0 6 1 0 7 6 7 8 57 58 59 60 61 68 69 74 75 80 EVENT OESCRIPTION Qg8 7 9 P o rational testin of i in restraints snubbers was bein er-80 Qg'ormed durin the heatu for Post Core Hot Functional testin . At the 7 89 80

[GD4] 260'F heatu lateau five INC mechanical snubbers were found to be 7 8 9 80 Qo 5 locked u . The immediate action was to replace the defective snubbers 7 8 9 toad with o erable snubbers. All of the INC snubbers have since been replace 80 7 8 9 PRME 60 SYSTEM CAUSE COMPOI4ENT COMPONENT COOE COOE COMPONENT COOE SUPPUER MANUFACTURER

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~zz ~z A N G E R ~A 'B 2 1 0 'N 11 12 17 43 44 47 CAUSE OESCFIIPTION Qg8 7 9 As reviousl re orted it was determined that oxidation of internal 80 to09 corn onents was the cause of the occurrence. Subse uent factory labora-7 8 9 80 tor testin and anal sis showed the followin 7 89 FACVPf METHOO OF 80 STATUS 9fi POWER OTHER STATUS 06COVERY OISCOVEAY OESCRIPTION Q~g 0 Loaoo J N A Preo erational Test Procedure 7 8 9 10 12 13 44 45 46 80 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE 'AMOUNT OF ACTIVITY LOCATION OF RELEASE t11g ~Z Z N/A N/A 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES 7 8 9 11 12 13 80 PERSONNEL INJURIES 7

~4 8 9 0'0 11 0ESCRIPTION 12 N A 80 P>QQ~LE CONSEQUENCES N A 7 8 9 80 LOSS OR OAMAGE TO FACILITY TYPE OESCAIPTION EE L~l 7 89 10 N A 80 PUBLICITY N/A 7 8 9 80 AOOITIONAL FACTORS See Pa es 2

'18 and 3 for continuation of Event & Cause Descriptions.

7 89 80 7 89 80 NAMEI M. A. Schop man PHONE 305/552-3779 GPO IIAI~ 6/7

REPORTABLE OCCURRENCE 335-7 6-9 SUPPLEMENTARY LER NO.

PAGE TWO l

Event Descri tion (Continued) by Pacific Scientific snubbers.

C Cause. Descri tion (Continued)

S/N 000377 The front. and rear caps of the snubber were removed. A thin layer of oxidation was found on the inside of both caps, and there was water inside the rear cap. The ball screw was opera-tional, and clearances between'internal components were normal. However, there was a large amount of rust sludge and water inside the center section which, caused rotational binding.

The rotational binding resulted in resistance to thermal move-

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ment.

Also, the thrust bearing was installed incorrectly at .the factory, but this did not cause the snubber malfunction.

S/N 000343 This snubber was found to have an improper end fitting (i.e.,

no ball bushing), and its indicator bar was slightly bent.

With the correct- end fitting, the snubber was opeiational, therefore, it was not disassembled.

S/N 000525 The front and rear caps were removed and the snubber interior was found to be clean. .The ball screw was operational, and the clearances between internal components were normal.

slight, rotational binding in the center section.

However,'here was When the adaptor assembly was rotated one revolution, the. snubber began to operate,. but with a higher .than normal resistance to movement. The adaptor assembly was removed and a small amount of oxidation was found on the thrust bearing. The amount of oxidation was considered large enough to have caused the snubber malfunction.

S/N 000695 Same description as for 000525.

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REPORTABLE OCCURRENCE 335-76-9 SUPPLEMENTARY LER NO.. 1 PAGE THREE Cause'escri tion (Continued)

S/N 000632

": The'ront and rear caps were'removed.and'he snubber -interior

was found to be clean. 'The ball screw. was operational, and the clearances between internal components were normal; However,

there -was rotational binding in the center section. The adaptor assembly was removed and a large amoun't of oxidation was found on

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the thrust bearing.. The oxidation caused the snubber malfunction.

FLORIDA POWER 8, LIGHT COMPANY June 10, 1976 PRN-LI-76-143 Mr. Norman C. Moseley, Director, Region II Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 230 Peachtree Street, N. W., Suite 818 Atlanta, Georgia 30303

Dear Mr. Moseley:

REPORTABLE OCCURRENCE 335-76-9 ST. LUCXE UNIT 1 DATE OF OCCURRENCE: MARCH 31, 1976 MECHANICAL PIPE RESTRAXNTS SUPPLEMENTARY REPORT NO. 1 The attached Licensee Event. Report is being submitted to supplement our initial report of April 12, 1976.

Very truly yours, Vice President Power Resources MAS/cpc Attachment cc: Jack R. Newman, Esquire Director, Office of Inspection and Enforcement (40)

Director, Office of Management Xnformation and Program Control (3)

HELPING BUILD FLORIDA

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EVENT OESCRIPTION erational testin of i in restraints snubbers was bein er-1 Q58 Prep 7 9 80

. foimed durin the heatu for Post Core Hot Functional testin . At the 7 89 80

~04 260'F heatu lateau, five INC mechanical snubbers were found to be 7 8 9 80 .

Qo g .locked u . The immediate action was to replace the defective snubbers 7 8.9 80 Qo 6 with operable snubbers. All of the .INC snubbers have since been replace 7 8 9 WPAE 80 SYSTEM CAUSE COMPONENT COMPONENT 7

[oa'] ~ZZ 8 9 10 COBE COOE

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MANUFACTUAER 2 1 0 47 N

48 CAUSE OESCRIPTION 7 8 9 As reviousl re orted it was determined that oxidation of internal 80 Qg8 corn onents was the cause of the occurrence. Subse uent. factory labora-7 9 80 Qg tor testin and anal sis showed the followin 7 89 80 FAC~ METHOO OF STATUS  % POWER OTHER STATUS OISCOVEAY OISCOVEAY OESCAIPTION Em L~l . N A C Preo erational Test, Procedure 7 8 9 '10 12 13 44 45 46 80 FORM OF ACTIVITY CONTENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE t11I ~Z

. Z N/A N/A 7 8 9 10 11 44 45 80 P

PERSONNEL EXPOSURES N A 7 89 11 12 13 , 80 PERSONNEL INJURIES NUMBER, OESCRIPTION 7 8'9

~00 0 12

'~4 N A 11 80 PROBABLE CONSEQUENCES N A 7 89 80 LOSS OR OAMAGE TO FACILITY TYPE OESCRIPTION Z N A

7. '8 9 '10 80 PU8LICITY N/A 7 8 9 "80 AOOITIONAL FACTORS

[]is] See Pa es 2 and 3 for continuation of Event & Cause Descriptions.

7 8 9 80 7 89 M. A. Schop man'HONE, 3 05/552 377 9 eFO 80 eeS- eeT

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REPORTABLE OCCURRENCE 335-76-9 SUPPLEMENTARY LER NO. l PAGE TWO Event Descri tion (Continued) by Pacific Scientific snubbers.

Cause Descri tion (Continued)

S/N 000377 The front and rear caps of the snubber were removed. A thin layer of oxidation was found on the inside of both caps, and there was water inside the rear cap. The ball screw was opera-tional, and clearances between internal components were normal. However, there was a large amount of rust. sludge and water inside the center section which caused rotational binding.

The rotational binding resulted in resistance to thermal move-ment.

Also, the thrust bearing was installed incorrectly at the factory, but this did not cause the snubber malfunction.

S/N 000343 This snubber was found to have an improper end fitting (i.e.,

no ball bushing), and its indicator bar was slightly bent.

With the correct end fitting, the snubber was operational, therefore, it was not disassembled.

S/N 000525 The front and rear caps were removed and the snubber interior was found to be clean. The ball screw was operational, and the clearances between internal components were normal. However, there was slight rotational binding in the center section.

When the adaptor assembly was rotated one revolution, the snubber began to operate, but with a higher than normal resistance to movement. The adaptor assembly was removed and a small amount of oxidation was found on the thrust bearing. The amount of oxidation was considered large enough to have caused the snubber malfunction.

S/N 000695 Same description as for 000525.

REPORTABLE OCCURRENCE 335-76-9 SUPPLEMENTARY LER NO. 1 PAGE THREE Cause Descri tion (Continued)

S/N 000632 The front and rear caps were removed and the snubber interior was found to be clean. The ball screw was operational, and the clearances between internal components were normal. However, there was rotational binding in the center section. The adaptor assembly was removed and a large amount, of oxidation was found on the thrust bearing. The oxidation caused the snubber malfunction.

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