ML19341B972
| ML19341B972 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 01/12/1981 |
| From: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-24, NUDOCS 8102280318 | |
| Download: ML19341B972 (2) | |
Text
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OYSTER CREEK NUCLEAR CENERATIN3 GTATION JCP&L-GPU
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(609) 693-1951 P.O. BOX 388
- FORKED RIVER
- 08731 wmr January 12, 1981 o
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Boyce H. Grier, Director pf
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Office of Inspection and Enforcement Region 1 J fW.),-),g313
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United States Nuclear Regu]atory e:
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King of Prussia, PA 19406
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Subject:
Oyster Creek Nuclear Generating Station Docket No. 50-219 I.E.
Bulletin No. 80-24 Addendum to I.E. Bulletin No. 80-24 Response dated January 5, 1981
Dear Mr. Grier:
In our orfginal response to I.E.
Bulletin 80-24, item 3, it was stated that " Oyster Creek has had no previous documented experiences with closed cooling water system leakage into the containment."
This statement was based on our review of all available maintenance job orders filed in our Document Control Center dating back to 1975.
Recently, based on the recollection of a possible leakage event in the early 1970's by a member of the plant staff, an additional source of information that had been previously overlooked was investigated.
This source (Semi-Annual Reports dating back to 1969), was found to contain the following three instances of cooling water system leakage into the contain-ment.
These events are summarized as follows:
1.
In early 1970 the cooling coil on 1-3 Primary Con-tainment Air Handler developed a leak due to chafing of the return bends between adjacent cooling coils.
The leak was repaired and the other air handlar cooling coils were inspected and found to have adequate spacing.
The amount of the leakage was not documented.
8:102280 %k C..
doyce H. Grier, Director January 12, 1981 2.
In March 1971 there was noted a gradual increase in the unidentified leak rate and the frequency of addition of make-up water to the Reactor Building Closed Cooling Water System.
Additionally, a water sample from the drywell sump revealed the presence of hydrazine, an additive to the closed cooling water system.
A decision was made to shut-down the plant and repair the leak.
A leak was discovered on the discharge piping of the drywell equipment drain tank cooling coil and the piping was replaced.
Total unidentified Icakage rate reached approximately 4gpm which was within the Technical Specification limit of Sgpm.
3.
In January, 1972 during a plant shutdown, a leak was discovered on the 1-5 drywell recirculation fan cooling coil.
Due to insufficient time for immediate repairs, the leaking part of the cooling coil was cut out of service and capped.
Repairs were completed during the next refueling outage.
As stated in our original submittal, the configuration of the drywell is such that a level of only 2' 3h" of water can be accumulated (approximately 26' below the bottom of the vessel) before draining into the torus through the ten downcomer lines.
If there are questions concerning this matter, please contact Mr. Michael Laggart of my staff at 609-693-6932.
Very truly yours, d@f Ivan R.
Finf ck, Jr.
Vice Presid nt - JCP&L Director - Oyster Creek j
Sworn and subscribed to before me this \\.d" day of hCnso r \\
1981.
w
_ 'OOf&' dOmakJ JANICE L BONDEYORC cc:
Director, NRC NOTARY PUSUC Cf G }EU[
Office of Inspection and Enforcement Washington, D.C.
20555
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