05000289/LER-1976-046, Forwards LER 76-046/01T.Provides Supplemental Info
| ML19261F194 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/28/1976 |
| From: | Creitz W METROPOLITAN EDISON CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML19261F195 | List: |
| References | |
| GQL-1757, NUDOCS 7910250613 | |
| Download: ML19261F194 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| 2891976046R00 - NRC Website | |
text
U.S. NUCLEAR REGULATORY C n SSION DOCKET NUMBER NRC FORM 195 50- 289 g2 76)
" $k!;"T REPOKT MlC DISTRiallTION FOR PART 50 DOCKET MATERI AL IN TO:
J.P.0'REILLY FROM: METRGPOLITAN EDISON CO.
DATE CF COCUMENT t
READING, PA.
12/28/76 W.M.CREITZ DATE RECEIVE D 1
1/6/77 I
OLETTER ONOTORIZED PROP (NPUT F O R*A NUMBER OF COPIES RECEIVED CDRIG IN AL D U NC L ASSIFIE D OCOev 1
DESCRIPTION
ENCLOSURE LTR. TRANS THE FOLLOWING......
.ICENSEE EVENT REPORT FOR R.O. # 76-46/1T, ON 12/13/76 CONCERNING TEH CONCENTRATION OF BORIC ACID IN THE BORATED WATER STORAGE TANK BEING LESS AN SPECIFIED MIND!UM.....
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King of Prussia, Pennsylvania 19hC6
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Dear Sir:
Docket No. 50-289 Operating License No. DFB-50 In accordance with the Technical Specifications of our Three Mile Island Nuclear Station Unit 1 (TMI-1), we are reporting the following reportable occurrence. However, as stated in the telephone conversation with.Vr.
- Hannon, of your office on December 27, 1976, this report is one day late.
(1) Report Number:
76 h6/lT (2a) Required Report Date:
12/27/76 (2b) Date of Occurrence:
12/13/76 (3) Facility: Three Mile Island Nuclear Station - Unit 1 (h) Identification of Occurrence:
Title:
Concentration of beric acid in the borated water storage tank less than specified mininu=.
?/pe:
A reportable occurrence as defined by Technical Specification 6.9 2.A(2) in that the concentration of boric acid in the Ecrated ~4ater Storage Tank was less than the specified minimum, thus leading to cperation of that system with a pareceter sub, ject to a limiting condition for cperation, less censervative than the least conservative aspect of that limiting conditio'. fci operatien established in Technical Specification 3.3.1.1. A.
184 1481 128
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- (5) Ccnditions Prior to occurrence:
Power:
Core:
2535 MWT Elec:
Sh5 MWe RC Pressure:
2155 psis RC Flow:
1h0x100 lbs/hr.
RC Temp:
579CF Tave PRZR Level:
220 inches PRCE Temp:
650 F (6) Description of Occurrence:
On December 12, 1976, while performing the Borated Water Storage Tank (3WST) Water Sample, boron concentratiens less than the required 2270 ppm were obtained. Ceveral additional samples were taken which substantiated the original findings. At Ch15 hours, 990 gallens of concentrated boric acid (11,280 ppm) were added to the BWST which increased the boron concentraticn to greater than 2270 ppm.
Subsequent sampling indicated boron concentrations less than 2270 ppm and approximately 3600 gallons of concentrated boric acid (12,000 pp=) were added to the BWST.
At Ohh5 hours on December 13, 1976, sa=ple results consistently indicated a concentration of 2330 pra.
On December 17, 1976, analysis of a known sample of borated water showed an uaexpectedly lov value.
It was found that the standard used in making the solution for determining boron concentrations was not of the proper concentration, thus giving results approximately 5% below the actual value. An estimate by calculation, shcVed that the boren concentration since December 3, 1976, was greater than 2270 pga.
However, because no definite proof can be established, we are still considering this a reportable event.
(7) Designation of Apparent Cause of Occurrence:
This event has been determined to be caused by leakage of water frcm the Deccy Heat Removal System, which was circulating Reactor Ccclant at 1200 ppm baron, back to the BWST through scue valves.
This would have a tendency to dilute the torsted water in the EWST.
Also, due to stratification within the tank, analysis performed on Eecember 3, 1976, indicated a concentration of 2296 ppm.
. (8) Analysis of Occurrence:
It has been determined that this occu-rence did not constitute a threat to the health and safety of the public in that the boron concentration in the EWST vas adecuate to safely shutdown the reactor.
(9) Corrective Action:
In addition to the immediate corrective action described above:
1)
The EWST recirculation system vill be evaluated to determine minimum recirculation time to assure representative samples are obtained in the future.
2)
The Chemistry Department personnel will be counseled to prevent recurrence of the analysis problem.
The Plant Operation Review Committee and Unit Superintendent have reviewed and approved the above corrective action and have taken steps to assure its ccupletion.
(10) Failure Date: N/A
Similar Events
None Sincerely,g
/
W. M. Cr 2t::
President
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