ML18227A432

Letter Transmitting Licensee Event Report, Low Boron Concentration Occurred in Unit 4 on 6/11/1976 in Accordance with Technical Specification 6.9.2 to Provide Prompt Notification

ML18227A432
Person / Time
Site:	Turkey Point
Issue date:	06/25/1976
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/RGN-II
References
PRN-LI-76-162
Download: ML18227A432 (7)

Text

NRC FQRM 195 U.S. NUCLEAR REGULATORY CO DOCKET NUMBER y-7BI 50-.251 .

FILE NUMBER NRC DISTRIBuTION FoR PART 60 DOCKET MATERIAL INCIDENT REPORT TO: FROM: DATE OF DOCUMENT Florida 'Power-6 Light Company 6/25/76 Mr, Norman C Moseley Miami., Flori;da DATE RECEIVED Mr A. D. Schmidt 7/6/76 ONOTORIZED PROP INPUT FORM NUMBE R OF COP IES RE CE I V E D PALETTE R OORIGINAL glfJNCLASSIFIED No original PfCOP Y DES C R I P T I 0 N ENCLOSU RE Ltr trans the followi,ng: Li.censee Event Report (RO 50-251/76-4) on 6/ll/76 concerning boron concentration of the boron in]ection tank & two of the thiee boric acid storage tanks being below thh lower tech spec limit.

ACKNOWLEDGED (1-P) (2-P) .

gP gaT REMOVE.

PXANT NOTE: IF PERSONNEL EXPOSURE IS INVOLVED NAME'urkey SEND DIRECTLY TO KREGER/J .COLLINS Point 84 FOR ACTION/INFORMATION 7 7 76 EIRANCH CHIEF: Lear W CYS FOR ACTION LIC..ASST.: Parrish W S ACRS CYS HOLDING S INTERNAL D IST RIBUTION NRC PDR.

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FLORIDA POWER 5 LIGHT COMPAi"IY June 25, 1976 PRN-LI-76-162 1),

Mr. Norman C. Moseley, Director, Region II 'R~5.~<~ '-

Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission eA 97 u~g>R %10 230 Peachtree Street, N. W., Suite 818 u.s "<0+@>SSIoII C+ogI g3l@.

Atlanta, Georgia 30303

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Dear Mr. Moseley:

REPORTABLE OCCURRENCE 251-76-4 TURKEY POINT UNIT 4 DATE OF OCCURRENCE: JUNE ll, 1976 LOW BORON CONCENTRATION

'he attached Licensee Event Report is being submitted in accordance with Technical Specification 6.9.2 to provide prompt notification of the subject occurrence.

Very truly yours, pocrs1S~

MsIIp0 D. Schmidt ga '97~ ~10~%OI

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Vice President ~

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'1 Power Resources MAS/cpc Attachment cc: Jack R. Newman, Esquire Director, Office of Inspection and Enforcement (40)

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

~ H LPING BUILD FLORIDA

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LlCENSEE EVENT REPORT

.CONTROL BLOCK: [PL PAINT ALL AEGIJIAED INFOAIIAATION) 1 6 UCeNSEE UCENSE EVENT NAME UCENSE NUMBER TYPE TYPE

[oaf p S4 00 0 0 0 0 0 0 0 4 1 111 ~01 7 89

'4 14 15 26 30 31 32 REPORT REPORT

. CATEGORY SOURCE OOCKET NUMBER EVENT OATE REPORT OATE

~01 cosv L 0 5 0 0 2 5 0 0 6 1 1 7 6 0 6 2 5 7 6 7 8 57 58 59 60 61 68 69 75 80 I

EVENT DESCRIPTION

[oaf Durin stead state o eration, routine sampling showed that, the boron 7 8 9 80 concentration of the boron in'ection tank (BIT and two of the three 7 89 80

~4 o 'c acid stora e anks BAST was below the lower Technical ecifica-7 8 9 80 Jog tion limit of 20,000 m. Corrective action was to initiate a shutdown 7 8 9 80 7

[ODg 89 i accordance with Administrat' Proc dur 103 8 nd e c 80 PRME SYSTEM CAUSE COMPONENT COMPONENT COBE COOE COMPONENT COOE SUPPUER MANUFACTURER LSSEI E v A L v E X A D 0 2 5 Y 7 8 9 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION 89 The exact cause of the BIT dilution was not found until the roblem had 80 tool

'7 89 80 Unit 4 BIT was caused b inleaka e from the RWST via the BIT inlet and 7 89 FACILITY METHOO OF 80

'STATUS

' POWER OTHER STATUS DISCOVERY OISCOVERY OESCRIPTION 7

Q'7" 8

LEJ 9

~io 10 o

12 13 N A 44 45 46 N A 80 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Elm LJz Lzl 'N A N A 7 s s 10 11 44 '45 80 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTION

~~~ ~oo o ~z N A 7 8 9 11 12 13 80 PERSONNEL INJURIES E04 7 89 LZLJ 11 12 80 PROBABLE CONSEQUENCES Qg N A 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION

~z N A 7 89 10 80

'UBLICITY 7 89 ~ 80 ADDITIONAL FACTORS'18 See Pa e 2 for continuation of Event Descri tion and Cause Descri tion.

7 89 80 7 89 80 NAME N. A~ S choppman 3 0 5/5 52 3779 PHONE CPO ddI>> ddT

wA REPORTABLE OCCURRENCE 251-76-4 LICENSEE EVENT REPORT PAGE TWO

'Event Descr'i tion (Continued' adding a concentrated boric acid solution to the tanks. The boron concentration of the tanks was. returned to within specification and normal operation was resumed. A similar problem experienced by Unit 3 is reported in Reportable Occurrence 250-76-4. (251-76-4).

Cause Descri tion (Continued) outlet isolation valves. Since the BIT was being recirculated with the BAST system, two of the three BAST's were also diluted.

Maintenance was performed on the inlet isolation valves 'to stop the leakage. Leakage past the outlet isolation valves was stopped by isolating the leakoff line from those valves. Several cases of BIT dilution have occurred, however, this was the first occurrence attributable directly to significant leakage past the isolation valves. Also, a situation in which cross-dilution occurred between a BIT and a BAST was previously discussed in report l 251-75-12,.

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