ML18227A446
| ML18227A446 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 11/21/1975 |
| From: | Schmidt A Florida Power & Light Co |
| To: | Moseley N NRC/RGN-II |
| References | |
| Download: ML18227A446 (8) | |
Text
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J FROIVI: Florida Pwr & Light Co
- Miami, Fla DATE OF DOC 11-21<<75 DATE R EC'D 12-1-75 LTR TWX RPT OTHER TO'r Moseley ORIG none si;gned L
CC OTHER SENT AEC PDR SENT LOCALPDR CLASS UNCLASS PROP INFO INPUT DESCRIPTION:
Ltr reporting Abnormal Occurrence f/75-ll on ll-12~75 concerning high boron.concentration in the "C" boric acid storage tank............;..
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DOCKET NO:
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P.O. BOX 3100 MIAMI,FLORIDA 33101 FLORIDA POWER & LIGHT COMPANY
'November 21, 1975 Mr. Norman C. Moseley., D'irector Region II Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 230 Peachtree
- Street, N.W;, Suite 818
~,Atlanta, Georgia 30303
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Dear Mr. Moseley:
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ABNORMAL OCCURRENCE 251-75-11 TURKEY POINT UNIT 4 DATE OF 'OCCURRENCE:
NOVEMBER 12 1
I DE@1 1S75a
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A.
975 HIGH BORON CONCENTRATXON XN THE,"C" BORIC ACXD STORAGE TANK 0
P(O y
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.CONDITIONS PRIOR TO OCCURRENCE Y
6' The Unit 4 reactor was in steady state power operat
. at about 99% rated power.
The Unit 3 reactor was in
, the refueling shutdown condition.
B.
DESCRIPTION OF OCCURRENCE At about ll:00 AM on November. 12, 1975, it was verified that the boron concentration in the "C" Boric Acid Storage Tank (BAST).was'above the upper limit defined in Technical Specification 3.6.b.3.,
The measured concentration was
'22,600 ppm which was slightly above the upper limit of 22,500 ppm.
C.
.DESIGNATION'OF APPARENT CAUSE OF OCCURRENCE This occurrence was caused by the addition of a concentrated boric acid solution to the "C" BAST which was in-service at the time.
The addition was made to increase the quantity of boric acid solution in the *"C" BAST to ensure that it was well above the minimum quantity required by Technical Specifications for single reactor operation.
Under normal operating conditions, the "B" BAST, which is normally iso-
- lated, would have been placed in-service and the "C" BAST (Continued)
HELPING BUILD FLORIDA
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r Mr. Norman C. Mose3ey November 21, 1975>
Page Two would have been isolated prior to the chemical addition.
However, maintenance on the 4A Boric Acid'ransfer Pump suction valve necessitated a system valve lineup that prevented the "B" BAST from being placed in-service. 'he action at this point would normally have been to complete the valve work and shift the in-service BAST, but the quantity of boric acid solution in the "C" BAST was near the low limit specified for single reactor"operation, therefore, the decision was made to pro'ceed with trans-ferring the boric acid solution to the in-service. "C" BAST..
Under the circumstances, a judgment was made that the con-servative action would be to add'o the in-service BAST which,-
could then be sampled and recirculated if necessary to bring the boron.concentration into specification.
D; ANALYSIS OF OCCURRENCE
'n increase in the boron concentration increases the
'potential for flow blockage caused'by the possible
~ precipitation of boric acid.
During this occurrence, checks of the boric acid system indicated there was no significant precipitation.
Temperatures throughout the system were well above the saturation temperature for a boron solution concentration of 22,600 ppm.
In addition, the high boron concentration increased the available.
negative reactivity in the C 'ASTg
--so the availability of the tank as a source of negative reactivity was not reduced.
Therefore, we conclude that the health and safety of the public were not adversely affected by this occurrence.
E.
CORRECTIVE ACTION
'rimary grade water was added to the "C" BAST and the
.contents of the tank were recirculated, to dilute the boron concentration.
The tank was resampled at about.
12:30 PM on November 12, and the boron concentration was 'found to be within specifications.
Operating Procedure 2603.5 will be revised to include a
requirement to sample the Boric Acid Batching Tank to ensure that its boron concentration is within the BAST specification whenever it is necessary to add boric acid solution to an in-service BAST.
(Continued)
P le
Mr., Norman C. Mosel November 21, 1975 Page Three F.
FAILURE DATA There has been'one previous occurrence involving high boron concentration in a BAST. It was reported as Abnormal Occurrence 250-73-10.
Very truly yours, A~. Schmidt Vice Presiden't Power Resources MAS/jar
'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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