ML18110A889

LER 1977-335-21 for St. Lucie, Unit 1 Steam Generator Manway

ML18110A889
Person / Time
Site:	Saint Lucie
Issue date:	04/15/1977
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/IE, NRC/RGN-II
References
LER 1977-335-21
Download: ML18110A889 (6)

Text

NRC IORM I2 70>>o' ~

1oIG

~

U.S. NUCLEAR REGULATORY COMMISSION So-z3S DOCKET NUMBER RRC DISTRIBUTION FOR T 50 DO CKI:T MATERIAL FILE NUMBER INCXDENT REPORT TO>> FROM: DATE OF DOCUM>>ENT Florida Power & Light Company 4/15/77 Mr. Noeman C. Moseley Miami, Fl'orida DATE RECEIVED A D Schmidt 4/26/77

>>

%LETTER 5'0 R I G IN AI.

C3 coP Y DESCRIPTION 0 NOTOR IZE D QKUNC LASS IF I E D PROP INPUT FORM ENCLOSURE

/ gZ4W~~

NUMBER OF COPIES RECEIVED I Ltro trans the following: Licensee Event Report (RO 50-335/77<<21) on 4/6/77 concerning a routine inspection of-the RCS showing evidence og 1'eakage from the "A" Steam Generator manway, ~ ~ ~ ~

o EIlIISI'iI.EIIIIELI:

I PLANT NAME:

h!N K>IoiS--

C I

I (1-P) (2-P) IIO ISt Lucie Unit No. 1 l

RJL NOTE: XF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J, COLLXNS FOR ACTION/INFORMATION BRANCH CHIEF:

M 3 CYS FOR ACTXON LXCo ASSTo M CXS ACRS CYS IMQR46 S NT INTERNAL D IST Rl BUT ON F.

NRC PDR X&E(2 MIPC SCHROEDER/IPPOLXTO HOUSTON NOVAK/CHECK GRIMES CASE HANAUER TEDESCO/MACCARY EISENHUT SHAO VOLLMER/BUNCH KREGER/J ~ COLLINS EXTERNAL DISTRIBUTION CONTROL NUMBER LPDR'XC c c f 9')Al o j/3 N~C ~

NIIC I ORM 190 {2 70)

P. O. BOX 013100, MIAMI, FL 33101 FLORIDA POWER & LIGHT COMPANY fg@g~y,l April. 15 '1977 PRN-LI-77-109 Mr. Norman C. Moseley, Director, Region'I Office of, Inspection and Enforcement U. S. Nuclear Regulatory Commission 230 Peachtree Street, N.W., Suite 1217 Atlanta, Georgia 30303

Dear Mr. Moseley:

REPORTABLE OCCURRENCE 335-77-21.

ST. LUCIE UNIT 1 DATE OF OCCURRENCE: APRIL 6, 1977 .~l'P i STEAM GENERATOR MANWAY The attached Licensee Event, Report is being submitted in accordance with Technical Specification 4.4.10.l.a to provide notification of the subject occurrence.

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

Director, Office of Management Information and Program Control (3) gg ling 8 I jO PEOPLE... SERVING PEOPLE

~

/

' 'I I

II'P

/

CONTROL BLOCK<: (Pk. PAINT ALL AEOUIAEO INFOAtAATIOIQ 1

t UCENSEc LICENSE EVENT 3 NAME LICENSE NUMSER 'TYPE TYPE ~

se89 0 0 0 0 0 0 0 0 4 1 1 1 1 ~99

~

7 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE ~

OOCKET NUMSER EVENT OATE REPORT OATh

[001] com'T ~0 ~L ~05 0 0 3 3 5 0 0 4 1 1 7 7 7 8 57 58 . 59 60 61 68 69 74 75 80 EIIENT DESCRIPTION

~02 During a shutdown to resolve secondary plant problems, a routine inspection of the RCS 7 8 9 80 QO 3 showed evidence of leaka e from the "A" Steam Generator manway. Plant conditions were 7, 8 9 80 g4] s ah1ished to remove the manwa lfor re lacement of the asket. Durin this evolution 7 8 9 80 tOOI5 the 20 manway retaining studs and nuts were inspected per Specifications 4.4a10.l.a&b. f 7 8 9 60 Qom i 13 of the studs had surface corrosion due to attack'from the boric acid. Xt was 7 8 9 PRME 80 SYSTEM CAUSE CCMFO3t ENT COMPQ N EatT COOK COOE COMPONcNT COO E SUPPtwKR MANUF~i'RER I007I ~cB F x x x x x x ~N C 4 9 0 7 S 9 10 11 12 17 43 47 48 CAUSE DESCRIPTION Q~ 6 a9 The leak in the manwa was ver small but a arentl had e i 60 ICOI last shntdown ins ection erformed a roximate1 one month a o. 3 11 7 7 8 9 80

~1 0 area is not accessible durin power o eration. The boric acid contained in RCS w ter 7 89 80 FA IUTY McTHOO OF

~ohioSTATUS  % POWER OTHER STATUS OISCOVERY OISCOVERY OESCRIPTtON

[ii~j . ~0 9

~00 o N/A 44 0

45 46 N A 80 7 S 10 12 13 FORM OF ACTTÃTY CONTENT RP EASEO OF RKLEAS ~ AMOUNT OF ACTIVITY LOCATION OF RELEASE

~2 Z ~Z N//t N/A 7 2 9 10 11 44 45 60 PERSONNEL EXPOSURES NUMSER TYPE OESCRtPTiCN, o z

~>>

7 a9 11 PERSONNEL INJURIES

'2 13 N/A NUMSER CESCRPTiON

~oo 0 N/A 7 89 11 12 80 P~OdABLE CONSEQUENCES Q~g N/A 7 8 9 60 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION z N/A 7 89 10 80 PUBLICITY N A 7 89 ADDITIONAL FACTORS tiis] See pa e 2 for continuation of Event Descri tion and Cause Descri tion 7 89 80 7 89 60 M'. A. Scho man PHONE 05/552-3802 CPO Cbt ~ 4ttT

r I'

'EPORTABLE OCCURRENCE 335-77-21 LICENSEE EVENT REPORT PAGE TWO Event Descri tion (Continued) felt that the studs were not degraded sufficiently to create any significant risk of failure. However, it was deemed prudent to replace the studs and this was done.

Specification 4.4.10.1.a requires an initial report'ithin 10 days on any abnormal degradation found during surveillance, and a detailed report within 90 days from completion of the surveillance. Since these studs were the only items surveilled, this report is intended to fulfillboth requirements. The inspection was done per Specifi-cations 4.4.10.l.a and b. and Table 4.4"6 Item 4.3. As described above, the corrosion was surface type due to boric acid attack. The deepest indication cn load bearing portions of the stud was, 1/16 inch (on a l~g inch stud). This was the first reportable occurrence of this type at St. Lucie Unit', l.

(335-77-21)

Cause Descri tion (Continued) had attacked the carbon steel studs, causing surface corrosion judged to be unacceptable.

\

~ I Or "r