ML20133D798
| ML20133D798 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 07/25/1985 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| (RDC-141(85)), NUDOCS 8508070464 | |
| Download: ML20133D798 (2) | |
Text
Lun f THE CLEVELAND ELECTR P.O. BOX 5000 - CLEVELAND, OHIO 44101 - TELEPHONE (216) 622-9800 - ILLUMINATING BLDG. - 55 PUBLICSQUARE Serving The Best Location in the Nation July 25, 1985 MURRAY R. EDELMAN PY-CEI/OIE 8084 L VICE MESIDENT NUCLEAR 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:
Derry Nuclear Power Plant Docket Nos. 50-440; 50-441 Drywell Vacuum Relief Isolation Valves
[RDC 141(85)]
Dear Mr. Keppler:
This letter is an interim report pursuant to 10CFR50.55 (e) concerning a potentially significant deficiency with the operation of the drywell vacuum relief isolation valves.
This deficiency was reported to Mr. R. Knop of your office by telephone on June 25, 1985 by Mr. B.
D. Walrath of The Cleveland Electric Illuminating Company.
This item is being evaluated per Deviation Analysis Report 245.
Description of Deficiency FSAR Section 6.2.1.1.3.3.2.5 requires the drywell vacuum relief isolation valves to open following the post-blowdown period after a LOCA when the drywell pressure falls below the containment pressure.
However, the requirement will not be met as the vacuum relief isolation valves will not open until drywell pressure falls low enough to clear the LOCA signal.
A significant difference in pressure may develop between the drywell and the containment prior to when the LOCA signal clears or when manual override is provided.
Completion of Evaluation We are currently completing our analysis of this problem.
The effect of the deficiency is being evaluated to determine if an isolation logic change is necessary or if the present design is adequate.
8508070464 050725 JUL 2 91965 PDR ADOCK 05000440 S
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$4 7
Ar. Jim 2a G. Ksppler July 25, 1985 PY-CEI/OIE 9984 We anticipate our next report on the subject to be submitted by August 29, 1985.
Please call if there are any additional questions.
Sincerely, 5
W Murray R Edelman Vice President Nuclear Group MRE:pab cc:
Mr. J. A. Grobe USNRC, Site Office (SBB58)
Mr. D. E. Keating USNRC, Site Office (SBB58)
Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Records Center, SEE-IN Institute of Nuclear Power Operations 1189 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339
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