ML20207L183
| ML20207L183 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 07/18/1986 |
| From: | Edelman M CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| (RDC-146(86)), PY-CEI-OIE-0223, PY-CEI-OIE-223, NUDOCS 8607300217 | |
| Download: ML20207L183 (3) | |
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f THE CLEVELAND ELECTR P.o. box 5000 - CLEVELAND. OHIO 44101 - TELEPHONE (216) 622-9800 - lLLUMINATING BLOG.
- 55 PUBLIC SQUARE Serving The Best Location in the Nation MURRAY R. EDELMAN SR VICE PRESIDENT July 18, 1986 NUCU A R PY-CEL /0IE 0223 L Mr. James G. Keppler Regional Administrator, Region III Of fice of Inspection and Enforcement U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 RE: Perry Nuclear Power Plant Docket Nos. 50-440; 50-441 HCU's Not Installed per EQ Requirements [RDC 146(86)]
Dear Mr. Keppler:
This letter serves as the final report for Unit 2 pursuant to 10CFR50.55(e) on the significant deficiency regarding inconsistencies between the installed Hydraulic Control Units (HCU's) and the design as analyzed and tested by our Equipment Qualification (EQ) program.
Mr. P. R. Pelke of your office was notified on June 19, 1986, by Mr. B. D. Walrath of The Cleveland Electric Illuminating Company (CEI) that this problem was being evaluated per our Deviation Analysis Report Number 267. This problem was previously reported for Unit I via our Licensee Event Report 86-014-0 dated June 13, 1986 (reference PY-CEI /NRR-0481 L).
Description of Deficiency It had been identified on Unit I that the installed Control Rod Drive HCU's did not conform to the qualified HCU in two aspects:
(1) All HCU mounting bolts were specified in installation instructions to be tightened to " firm contact" or " snug tight" instead of to the torque values used for the EQ test specimen; and (2) sixteen (out of a total of 177) were fitted with a side-mounted branch junction module which was not accounted for in EQ testing.
A walkdown of currently installed HCU's in Unit 2 has shown that none have a side-mounted branch junction module installed. However, the torque values for the HCU mounting bolts are suspect as the same installation instructions were utilized on both Unit I and 2.
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- Mr. J. G. Keppler July 18, 1986 PY-CEI/01E 0223 L Analysis of Safety Implication Had the problem gone uncorrected, the HCU's would have operated successfully for a reduced service life equivalent to at least one Perry unique faulted event (as described in LER 86-014-0). However, seismic qualification throughout the entire forty year plant life could not be assured.
Corrective Action Nonconformance Report MHQ-0031 has been initiated to document the suspect torque values for the HCU mounting bolts for all currently installed HCU's in Unit 2. The appropriate installation drawings will be changed to reflect required torque values to ensure correct installation of the remaining mounting bolts. The installation drawings will also be revised to caution against the mounting of branch junction modules on the HCU's.
The incorrect installations resulted from failure of General Electric (GE),
our NSSS supplier, to specify installation requirements for the HCU's as identified in the EQ report. In order to determine whether or not this was an isolated instance, we will review a sample of GE supplied EQ reports. This review will examine EQ requirements to determine if they are adequately reflected in the design and will specifically look for items (such as torquing requirements) which are not verifiable by visual observation. We will expand the scope of this review as dictated by the results of the initial sample.
The lessons learned from this review will be applied to the Unit 2 walkdown as appropriate.
Please call if there are any questions.
Sincerely, rt.
I Murray R. Edel an Sr. Vice President Nuclear Group MRE:sab l
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Mr. J. G. Ksppler July 18, 1986 PY-CEI/01E 0223 L cc:
Mr. J. Grobe, USNRC SBB50 Mr. K. Connaughton, USNRC SBB50 Mr. J. J. Stefano, Project Manager Licensing Project Manager, Branch 1 Division of Boiling Water Reactor Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555 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 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 33039
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