ML19339C964
| ML19339C964 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 01/05/1981 |
| From: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-24, NUDOCS 8102120564 | |
| Download: ML19339C964 (3) | |
Text
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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BOX 8699 1881 1981 PHILADELPHIA. PA.19101 l
SHIELDS L. DALTROFF ELac a c Peo c om January 5, 1981 Docket Nos. 50-277 50-lin i
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s Region 1 p
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'Q Mr. Boyce H.
Grier, Director LU w.$'
i Office of Inspection & Enforcement
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US Nuclear Regulatory Commission gg SO a
631 Park Avenue D
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King of Prussia, PA 19406
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Dear Mr. Grier:
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This is in response to your letter of November 21, 1980, which forwarded IE Bulletin 80-24.
Items 1 and 2 of " Actions to be Taken by Licensees" apply to plants with open cooling water systems.
Since the cooling water systems employed in the containment at Peach Bottom are closed systems, no response is required for these items.
Item 3 is restated below with our response.
In response to your request for a manpower estimate, approximately 30 manhours were expended in preparation of this response.
Actionc to be Taken by Licensees:
For plants with closed cooling water systems inside containment provide a summary of experiences with cooling water systems leakage into containment.
~
Response
At Peach Bottom two closed cooling water systems are employed l
within containment.
The drywell chilled water system cools the l
containment sump coolers, recirculation pump motor coolers and l
the drywell chillers.
The reactor building closed cooling water
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(RBCCW) system cools the recirculation pump seal coolers and the l
recirculation pump motor oil reservoir coolers.
A cross tie line 1
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Mr. Boyce H.
Grier Page 2 between the two systems allows emergency use of RBCCW if the drywell chilled water system should fail.
Both systems employ make-up systems which have instrumentation to detect excessive system out-leakage.
Review of leaks associated with these systems disclosed a total of four minor leaks since both units began commercial operation in 1974.
The leaks are characterized briefly as follows:
1.
In 1977 during a outage, a test top on the cooling water discharge from a Unit 3 containment drywell chiller heat l
exchanger was broken off.
The break was isolated and repairs were scheduled and completed within three days.
i 2.
In 1978 during an outage, a dripping packing leak was observed on a Unit 3 drywell chiller inlet valve.
Repairs were scheduled and made during the outage.
3.
In 1980 on Unit 3 a leaking recirculation pump motor cooler flow element swagelok fitting was discovered.
Repairs were scheduled and completed the following day.
4.
In 1980, during a Unit 2 outage, an air local leak rate test of the drywell chilled water system revealed a leaking flexible steel hose which supplies water to a recirculation pump reservoir cooler.
There was no evidence of increased sump pumpout prior to isolation rf the system for the leak test.
The system remained isolated until after the repair was completed three days later.
Very truly yours,
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Attachment cc Director Office of Inspection & Enforcement US Nuclear Regulatory Commission Washington, DC 20555 l
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COMMON'JEALTII 0F PENNSYLVANI A :
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COUNTY OF PIIILADELPilIA S.
L.
Daltroff, being first duly sworn, deposes and says:
That he is Vice President of Philadelphia Electric Company; that he has read the foregoing response to IE Bulletin 80-24 and knows the contents thereof; and that the statements and matters set forth therein are true and correct to the best of his knowledge, information and belief.
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/ t Subscribed and sworn to before ne this day M%, k I
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