ML20081H536
| ML20081H536 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 10/25/1983 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, RDC-74(83), NUDOCS 8311070499 | |
| Download: ML20081H536 (2) | |
Text
8/H/]
i P O Box 5000 - CLEVELAND. oHlo 44101 - TELEPHONE (216) 622-9800 - lLLUMINATING BLDG.
- 55 PUBLICSOUARE Semng The Best Location in the Nation MURRAY R. EDELMAN October 25, 1983 VICE NIESIDENT NUCUAR Mr. James G. Keppler Regional Administrator, Region III Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 RE:
Perry Nuclear Power Plant Decket Nos. 50-440; 50-441 Evaluation of P72 System Porous Concrete Pipes and Weepholes
[RDC 74(83))
Dear Mr. Keppler:
This letter serves as a second interim report pursuant to 10CFR50.55(e) concerning our evalestion of partial blockage found in a number of porous concrete pipes and weepholes associated with the pumping drain system portion of the Pressure Relief Underdrain System (P72).
Initial notification that this problem was being evaluated was made to Mr. P. R. Pelke of your office on June 10, 1983, by Mr. E. Riley of The Cleveland Electric Illuminating Company.
The first interim report was submitted on July 8,1983.
This report contains a description of the deficiency, the method planned for completion of evaluation including corrective action taken to date, and the planned date for the final report.
Description of Deficiency Inspection of the underdrain system manholes revealed varying degrees of blockage in the 12" diameter porous concrete pipes and the weepholes. Addi-tionally, the weepholes in the south wall of the Emergency Service Water Pump House were found in this condition.
The porous concrete pipe and the weepholes are part of the pressure relief underdrain system (P72) provided to ensure that the ground water level around the nuclear island does not exceed 590.0 feet (FSAR Section 2.4.13.5).
Method Planned for Completion of Evaluation In our first interim report, we detailed an Action Plan developed to determine the origin and composition of the naterial causing the blockage.
In pursuit of our Plan, all sampling necessary to analyze the ground water and the sediment has been completed. Also, the 12 inch diameter porous pipes, 4 inch weepholes, and underdrain manholes have been flushed clean to remove the sediment blockage.
Additionally, to confirm adequate removal, the porous piping was videotaped f ollowing the cleaning operations.
An inspection program has been initiated for future monitoring on a regularly scheduled basis. This inspection program is in accordance with our commitments in the FSAR, Section 2.4.13.5.4 8311070499 831025 M
gDRADOCK 05000440 OCT 27 PDR S$? )
0
Mr. Jtmes G. Kappler October 25, 1983 Initial chemical analysis of the subject sedimentation has been completed.
The results of this analysis are currently being evaluated. To aid in inter-preting these chemical results, consultants from the Portland Cement Associa-tion (PCA) have been commissioned. To date, the preliminary results of PCA's evaluation indicate that no adverse effect on the strength of the porous concrete has taken place. Currently, PCA is utilizing petrographic analysis of porous concrete samples cored from the underdrain blanket to provide further support of their initial observations.
To date the water table beneath the nuclear island has been maintained at a uniform elevation as specified in the FSAR, Section 2.4.13.5.1.
The water elevations have been verified on a regularly scheduled basis through the monitoring program of piezometers set forth in the FSAR, Section 2.4.13.5.1.
Planned Date for Final Report l
It is our intention to submit a final report on this subject by June 1,1984.
This date will permit completion of our Action Plan and an Engineering evalua-tion of the results of the investigation.
Please call if you have any questions.
Sincerely, Murray R.
delman Vice President Nuclear Group MRE:pab cc:
Mr. M. L. Gildner NRC Site Office Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission j
Washington, D.C.
20555 U.S. Nuclear Regulatory Commission i
c/o Document Management Branch Washington, D.C.
20555 Records Center, SEE-IN j
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 j
.