ML20059G320
| ML20059G320 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 11/01/1993 |
| From: | Durr J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Sieber J DUQUESNE LIGHT CO. |
| Shared Package | |
| ML20059G323 | List: |
| References | |
| NUDOCS 9311080066 | |
| Download: ML20059G320 (3) | |
See also: IR 05000412/1993021
Text
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Docket N7.
50-412
Mr. J. D. Sieber
Senior Vice President
Nuclear Power Division
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Duquesne Light Company
Post Office Box 4
Shippingport, Pennsylvania 15077
Dear Mr. Sieber:
SUBJECT: NRC REGION 1 INSPECTION REPORT NO. 50-412/93-21
This letter transmits the findings of the announced safety inspection conducted by
Mr. P. Patnaik and Ms. C. Beardslee of this office from August 30 - September 3,1993,
and October 4-8,1993, at the Beaver Valley Power Station, Unit 2, Shippingport,
The inspection was directed at areas important to public health and safety and was conducted
in two phases: one just prior to the refuel outage, and the second during the refuel outage.
The first phase of the inspection centered around review of the inservice inspection (ISI)
program, the cosion/ corrosion monitoring program, the scope of work for the outage, and
the procedures. Be second phase of the inspection focused on witnessing inservice
inspection and the steam generator tube examination. The results of this inspection were
discussed with you and the members of your staff at the exit meetings on September 3,1993,
and October 8,1993.
The inspectors found that the number of components selected for erosion /ccrrosion
monitoring was small in relation to the total population of components and was not supported
by analysis using any predictive methodology available to the industry. We recognize that
you have taken special measures, by control of chemistry, to prevent erosion / corrosion.
Notwithstanding these measures, we understand that you are currently evaluating more
structured methods available in the industry to select components for erosion / corrosion
monitoring. Please provide us your schedule for implementing this expanded program.
The inspectors found, from the review of the chemistry manual, that if the primary-to-
secondary leak rate reaches 250 gallons per day, the plant power should immediately be
reduced to less than 50 percent power within an hour. Even though this leak rate is
allowable under your technical specifications and taking into consideration some of the recent
tube failures at other plants, it may be prudent to reevaluate the conservatism of this leak rate
against a potential tube rupture in the presence of an active degradation mechanism.
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9311000066 931101
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The inservice inspection and the non-destructive examination activities were generally.
planned, controlled and documented properly. No violations were identified during this
inspection. Your cooperation with us in this matter is appreciated.
Sincerely,
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JacqueP,D=T
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Jacque P. Durr, Chief.
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Engineering Branch
Division of Reactor Safety
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Enclosure: NRC Region I Inspection Report No. 50-412/93-21
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G. S. Thomas, Vice President, Nuclear Services
D. E. Spoerry, Vice President, Nuclear Operations
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L. R. Freeland, General Manager, Nuclear Operations Unit
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K. D. Grada, Manager, Quality Services Unit
N. R. Tonet, Manager, Nuclear Safety Department
H. R. Caldwell, General Superintendent, Nuclear Operations
K. Abraham,' PAO (2)
Public Document Room (PDR)
Local Public Document Room (LPDR)
Nuclear Safety Information Center (NSIC)
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NRC Resident Inspector
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Commonwealth of Pennsylvania
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State of Ohio
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