ML18227A433

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

ML18227A433
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: ML18227A433 (6)

Text

FLORIDA POWER 8I LIGHT COMPANY June 25, 1976 PRN-LI-76-162 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 251-76-4 TURKEY POINT UNIT 4 DATE OF OCCURRENCE: JUNE ll, 1976 LOW BORON CONCENTRATION The 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, D. Schmidt Vice President 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)

HELPING BUILD FLORIDA

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LICENSEE EVENT REPQ ~

CONTROL BLOCK: fPLEA8E PAINT ALL REQUIRED INFORMATION)

V 6 LCENSEE UCENSE EVFNT NAME LICENSE NUMBEA TYPE TYPE

[oa~j P S 4 0 0 0 0 0 0 0 0 0 4 1 1 1 1 Loocl~j

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7 89 14 15 25 26 30 31 32 7

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. CATEGORY 57 58 REPORT TYPE 59 REPORT SOURCE L

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. 61 5 0 OOCKET NUMSEA 0 2 5 0 68 061176062576 69

~ EVENT OATE 74 75 REPORT OATE 80 EVENT OESCRIPTION

[0D2J Durin stead state -o eration, routine sampling showed that the boron 7 8 9 80

[oO3] concentration of the boron in'ection tank (BIT and two of the three 7 89 80

~4 o ' d to a nks BAST was b low the low r Tech 'c S cifica-7 8 9 80

[oas] tion limit of 20,000 m. Corrective action-was to initiate a shutdown 7 8 9 80 t0ag 'n a cordance with Administrat roc dur 1 '

an 7 8 9 FAME 80 SYSTEM CAUSE COMPONENT COMPONENT COOE COOS COMPONENT COOE SUPPUER MANUFACTURER

[007] ~~H ~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 OESCRIPTION QO 7

8 8 9 The exact cause of the BIT dilution was not found until the roblem had 80 7 8 9 80 Q1 0 Unit 4 BIT was caused b inleaka e from the RWST via the BIT inlet and 7 89 METHOO OF 80 FACILITY STATUS 96 POWER OTHER STATUS OISCOVERY OISCOVERY OESCRIPTION

~I1 E ~10 0 N A b N A 7 8 9 10 12 13 44 45 46 80 FORM OF ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Qg z z N A N A 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTION P~g ~00 o ~z N A 7 89 11 12 13 80 PERSONNEL INJURIES EQ4 7 89 LOLt~ 11 12 80 PRPBABLE CONSEQUENCES Qs] N A 7 89 80 LOSS OR DAMAGE TO FACILITY TYPE OESCAIPTION z N A 7 89 10 80 PUBLICITY 7 89 80 AOOITIONAL FACTORS'~8 See Pa e 2 for continuation of Event. Descri tion and Cause Descri tion.

7 89 80 7 89 80 NAME: M. A. Schoppman 305/552-3779 GPO 8GI>> OGT

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REPORTABLE OCCURRENCE 251-76-4 LICENSEE EVENT REPORT PAGE TWO Event Descri 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 251-75-12.

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