ML19312C939
| ML19312C939 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/17/1975 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19312C932 | List: |
| References | |
| NUDOCS 8001140595 | |
| Download: ML19312C939 (2) | |
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DUKE p0'a'ER COMPANY OCONEE UNIT 2
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JReport No. : A0-270/75-19
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Report Date:
October 17, 1975 Occurrence Date:
October 3, 1975 Facility:
Oconee Unit 2, Seneca, South Carolina Identification of Occurrence:
Unplanned Release of Radicar.tive Liquid Through Turbine Building Snmp
_ Conditions prior to Occurrence:
Not Applicable Description of Occurrence:
On September 30, 1975, routine chenistry tests performed on the Oco i
1 and 2 turbine building sump revealed a measurable amount of radio nce Units i
activity, a sample reruit of 1.48 x 10-4 pCi/ml gross beta activity being recorded.
A search te locate the source of this activity was immediately initiated.
The search continued until October 3,1975 when a pipe con-necting the Unit 2 couponent drain-pump discharge header to the turbine building trench Icading to the Units 1 and 2 turbine building sump wa discovered.
the turbine building mep andFollow-up samples indicated correlation of activity be s
pipe was the source of activity.the quench tank demonstrating that this jDesignation of Apparent Cause of Occurrence:
sump had been incorrectly installed and should discha u
ng storage tank.
the steam generator to the condensate storage tank vi nsate side of component drain pump, tl.2reby allowing for quick drainage of the steam The component drain pump is also used to pump radioact mp.
on the line in question to prevent leakage of radioactive rom the liquid from the quench tank to the biced holdup tanks. ~
discovered to be leaking, particularly when the pump was in operation s
therefore, was allowing radioactive liquid to flow from the que, and through the component drain pump and into the turbine building s nch tank
.the improperly installed line.
ump via
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_ Analysis of Occurrence:
Unit 2 since construction.The pipiag arrangement, as described earlier, has
-leak rate of 600 ml/ min, based on leak rate measurements, a n
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component drain pump running time and the average reactor coolant activities, for'the period January 1, 1975 to October 3, 1975.
This calculation has determined that releases for -1975 were:
Total beta activity, 0.6973 curies; total tritium, 19.8991 curies; and total noble gases, 0.0439 curies. Values for 1974 are considerably less due to extensive unit outages during the year. These values are well within the activity release limits and concentration units specified by Section 3.9 of the Oconee: Technical Specifications and 10CFR20 in themselves and when combined with other known releases.
Therefore, it is concluded that the health and safety of the public was not affected by this occurrence.
Corrective Action:
c A flanged orifice,. located downstream of the Icaking isolation valve, has been removed and a blank installed.
This will prevent any further flow through the pipe.
This same procedure has been accomplished on Units 1 and 3 even though these lines have been determined to be routed 1
I correctly to the condensate storage tank on these units.
In additi'on,
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a modification will be instituted which will completely remove the pipe.
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