ML18227A472
| ML18227A472 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 01/30/1975 |
| From: | Schmidt A Florida Power & Light Co |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18227A472 (6) | |
Text
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97 FIL'E:
FRQiif: Florida power
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33101 A. D.
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Mr. E.
Case DATE Or CQC 1 ORIG 1 signed DATE REC'.D CC OTHER LTR RPT '
SENT AEC PDR SENT LOCAL PDR OTHER CLASS
.UNC LASS XX PROPliUFO INPUT NO CYS RFC'D DOC, Ej NO:
50-251
'DESCRI. TION:
Ltr reporting Abnormal Occurren AO-50-251/75-2 on 1-20-75 re low boron conces boron injection tank I "C" boric acid storage tanko
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iENCLOSURES:
ration PLANT NAME:
Turkey pt. Unit II.
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O. IIOX 9100 IhUVAIiA.ORIDA 03IOI Regulatory Docket Mr. Edson G.
- Case, Acting Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.
C.
20555
Dear Mr. Case:
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FLORIDA POWER Ei LIGHT COMPANY ABNORMAL OCCURRENCE NO. 251-75-2 OCCURRENCE DATE:
JANUARY'0, 1975 TURKEY POINT PLANT UNIT NO.
4 LOW BORON CONCENTRATION BORON INJECTION TANK AND
'O'ORIC ACID STORAGE TANK A.
CONDITIONS PRIOR TO OCCURRENCE Unit No.
4 was operating at approximately 100% reactor power.
The Boron Injection Tank (BIT) recirculation line connecting the BIT outlet with the Boric Acid Storage Tank (BAST) was blocked by boric acid crystals.
Temporary high pressure hoses were connected between the BIT outlet re-circulation piping and the Boric Acid Batching Tank to enable concentrated boric acid from a BAST to be periodically pumped through the BIT while the normal recirculation line was blocked.
B.
DESCRIPTION OF THE OCCURRENCE On January 20, 1975 at 2:27 p.m.,
a sample of the 'O'AST was analyzed and found to contain 18,900 ppm of boron.
This is below the Technical Specifica-tion limit of 20,000 ppm.
The 'O'AST was immediately taken out of service and the 'B'AST lined up for service on Unit No. 4.
At 2:58 p.m.,
sample results for 17,800 ppm boron.
The Technical load reduction of Unit No.
4 was boric acid from 'B'AST through within the specified limits.
the Unit No.
4 BIT were determined to be Specification limit is 20,000 ppm.
Immediate commenced along with pumping concentrated the BIT to return the boron concentration to C.
CAUSE OF THE OCCURRENCE Demineralized water used to flush the temporary hoses resulted in dilution of the boric acid in the Batching Tank.
The diluted boric acid was then in-advertently pumped to the 'O'AST without taking action to ensure that it would not dilute the contents of the 'O'AST to a boron concentration below the specified limit.
This action in fact resulted in the dilution of boron concentration in 'O'AST below specified limits and upon subsequent circula-tion of the 'O'AST contents through the BIT resulted in dilution of the BIT boron concentration to a value below the specified limit.
LlS7 HELPING BUILD FLORIDA
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4 Mr. Edson G. Case, Acting Director Page Two January 30, 1975-D.
ANALYSIS OF THE OCCURRENCE The contents of the BIT are used for controlling the consequences of a steam, line break.
The analysis of the, steam line break presented in the FSAR assumes a m'inimum boron conce'ntration of 20,000 ppm.
While the actual plant condition with respect to this assumption was less conservative, there are
'ther significant parameters, such as reactor shutdown reactivity margin and rate of injection of borated water, whose actual plant values are more con-servative than those assumed in the FSAR analysis.
These factors, coupled with the margin to DNB that exists even for the most conservative case analyzed in the FSAR, lead to the conclusion that an analysis based on actual plant parameters would yield results that are acceptable.
Therefore, it can be concluded that the dilution of the BIT contents did not present any danger to the public health and safety.
E.
CORRECTIVE ACTION The 'O'oric Acid Storage Tank was removed from service and the 'B'oric Acid Storage Tank was placed in service.
The boron concentration of the contents of 'O'oric Acid Storage Tank was increased to a value within the specified limits by the addition of concentrated boric acid from the Batching Tank.
The BIT contents were returned to the proper boron concen-tration by circulating concentrated boric acid through the tank.
The plant operators have been cautioned to ensure that appropriate sampling and analysis for boron concentration are carried out before transferring boric acid from the Batching Tank to a BAST and before placing a BAST in service.
Permanent corrective action will be to clear or renew the blocked recircula-tion line.
In addition, a design change that'ill provide for continuous recirculation of the BIT contents with the contents of a BAST is currently in the process of being reviewed prior to implementation.
F.
FAILURE DATA This is the fifth abnormal occurrence in which dilution of the contents of the BIT has occurred at Turkey Point and the fourth occurrence on Unit No. 4.
Very truly yours,
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o c i t Vice President Power Resources HNP/cpc cc:
Mr. Norman C. Moseley Jack R.
Newman, Esquire
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