05000320/LER-1985-001, :on 850104,survey Results Indicated Minor Degradation of Flood Protection Dike.Caused Not Stated. Degradation Minor & No Corrective Actions Necessary at Present
| ML20135H934 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/12/1985 |
| From: | Dell C, Standerfer F GENERAL PUBLIC UTILITIES CORP. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 0309A, 309A, 4410-85-L-0173, 4410-85-L-173, LER-85-001, LER-85-1, NUDOCS 8509250027 | |
| Download: ML20135H934 (3) | |
| Event date: | |
|---|---|
| Report date: | |
| 3201985001R00 - NRC Website | |
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NRC Form 388 U 8. NUCLE 43 REGULATORY COamsagsm "I
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Special Licensee Event Report (LER)85-001 reported the results of a January 3,1985, survey of Regions 1 and 2 of the TMI Flood Protection Dike.
The survey results showed that sections of the dike in Region 1 were below the 305' elevation specified for that region in the TMI-2 Final Safety Analysis Report (FSAR).
The suggested long term corrective action called for by the Incident Event Report (IER) included a survey to determine the elevation of the remainder of the dike.
A survey was performed by taking elevation readings at twenty foot (20')
intervals around the entire length of the dike. The survey gave an accurate profile of the dike in its present state.
Results of the survey showed that sections of the dike were below the nominal values stated in the Unit 2 FSAR. As stated in the FSAR the maximtsn crest elevation of the dike at the north end of the island is 310'.
The actual top of the dike elevation at this location is 309.55'e 8509250027 850912 PDR ADOCK 05000320 S
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The FSAR also requires a maximum crest elevation of 304' at the south end of the island. The low area of the south dike is 303.22'.
In addition, the FSAR states that the dikes along both sides of the island should descend uniformly from 310' to 305'. However, there are a few areas of the dike where the lowest elevation is below the 305' level; the lowest elevation is 304.70'.
TMI-2 does not consider this minor degradation of the dike to be a safety concern. This determination is based on the following:
The purpose of the protective dike surrounding the island is to guarantee the continued safe operation of the unit up to design flood conditions.
Water elevations at design flood conditions are 304' at the north end of the island and 303' at the intake structure. Both of these levels are below the current maximum elevations of the dike.
The'TMI-2 Technical Specifications, Section 3.7.6, requires that all door seals and flood panels be installed and that all watertight doors be closed within two (2) hours of the river stage reaching an elevation of 302', as measured at the TMI-l Intake Structure. The degraded sections of the dike are not below 303.22'.
Therefore, the degraded sections of the dike are still well above the action level specified in the TMI-2 Technical Specifications.
The TMI-2 FSAR states the Probable Maximum Flood (P W ) would overtop the design elevation of the dike.
The flood of record, which occurred in 1972, caused a water level of 301.30' at the north end of the island, and 299.37' at the south end.
Both levels were well below the current maximum crest elevations of the dike.
Based on the above, GPU Nuclear believes that the dike degradation is minor and that no corrective actions are necessary at this time to restore the dike to design elevations.
GPU Nuclear Corporation NUCIMr Post Office Box 480 Route 441 South Middletown, Pennsylvania 17057 0191 717 944-7621 TELEX 84 2386 Writer's Direct Dial Number:
(717) 948-8461 4410-85-L-0173 Document ID 0309A September 12, 1985 Office of Inspection and Enforcement Attn: Dr. T. E. Murley Regional Administrator US Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406
Dear Dr. Murley:
Three Mile Island Nuclear Station, Unit 2 (TMI-2)
Operating License No. DPR-73 Docket No. 50-320 Special Licensee Event Report 85-001 Update Attached is an update to Special Licensee Event Report (LER)85-001 which concerned minor degradation in Region 1 of the THI Flood Protection Dike.
This report is being submitted in accordance with THI-2 Technical Specification Section 6.9.2 and Recovery Operations Plan Section 4.7.6.1.3.
Sincerely, f
W F. R. Standerfe Vice President / irector, THI-2 FRS/CI/eml Attachment cc: Program Director - TMI Program Office, Dr. B. J. Snyder Deputy Program Director - TMI Program Office, Dr. W. D. Travers Document Control Desk GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation i
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