ML19320D141
| ML19320D141 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 06/25/1980 |
| From: | Robert Carlson NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| NUDOCS 8007210015 | |
| Download: ML19320D141 (1) | |
Text
{{#Wiki_filter:Y.% e e UNITED STATES [jp nfrog) NUCLEAR REGULATORY COMMISSION [qg nEcios : g 5 f $31 eARK AVENUE g f xina o, enussia.,Ennsvov4Nia is4os M25a Docket Nos. 50-352 50-353 Philadelphia Electric Company ATTN: Mr. John S. Kemper Vice President Engineering and Research 2301 Market Street Philadelphia, Pennsylvania 19101 Gentlemen:
Subject:
HVAC Damper Deficiency (Your letter of June 6,1980) Thank you for your letter, referenced above, which forwarded a final report pursuantto10CFR50.55(e)regardingthesubjectmatter. Your report will be reviewed and evaluated, and should we require additional infonnation concerning this matter, we will contact you. Your cooperation with us is appreciated. Sincerely, / s o ert T. Carlson, Chief Reactor Construction and Engineering Support Branch cc: V. S. Boyer, Senior Vice President, Nuclear Power 80 07Jt# #o/f
f.; PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 JOHN S. KEMPER vics+essiosper o...................e Mr. Boyce Grier, Director Office of Inspection and Enforcement R.egion I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
Subject:
Significant Deficiency Report No. 10 HVAC Damper Deficiency Limerick Generating Station, Units'I and 2 NRC Construction Permit Nos..CPPR-106,. 107
Reference:
Telecon of May 7,.1980 H. R. Walters (PECO) to R. McGaughy (NRC) QUAL 2' 10-2' ~(SDR 110) File: Daar Mr. Grier: Attached is our final report on the above subject deficiency which was reported to the USNRC per the referenced telecon in accordance with'10CFR50.55(e). If there are any questions on the matter we would be pleased .to discuss them with you. Sincerely, 8 S/ /r Copy to: Director of Inspection and Enforcement United States Nuclear Regulatory Commission Washington, D.C. 20555 I) (([IQ l l O $~'Q I
s a s t. l FINAL REPORT ON BACK PRESSURE STEAM ISOIATION DAMPER ELECIRICAL CONNECTION DEFICIENCY AT LIMERICK GENERATING STATION UNITS 1 and 2 l Philadelphia Electric Company June, 1980 SDR-10-1 l j 1-1
g._ ?; 4 i t i TABLE OF CONIENTS 1 .l
1.0 INTRODUCTION
2.0 DESCRIPTION
OF PROBLEM 3.0 ANALYSIS OF SAFETY IMPLICATIONS 4.0 CORRECTIVE ACTION TAKEN
5.0 CONCLUSION
S \\ i 5 i ~ SDR-10-2 a. A- ' 0&L Lf-{- r ca r,.* 7 fN O
~. s I 1.0 IRIRODUCTION The Limerick Generating Station Purchase Order 8031-M-113BC has procured back pressure steam isolation dampers from American Warming and Ventilating, Inc. for use in safety related systems. Certain violations of the requirements of Project Specification 8031-M-113 BC regarding workmanship on damper wiring and terminations have been identified. It has been determined that plant safety l could have been compromised had these workmanship violations gone unidentified. In compliance with 10CFR50.55 (e), this Final Report.is issued to describe the deficiencies, analyze the safety implication of the deficiencies, and describe the action taken to correct the deficiencies and prevent their recurrence. This significant deficiency was reported via telecon to the USNRC, Region 1 on May 7, 1980. 2.0 Description of Problem Improperly crimped electrical connecting lugs and nicked wire insulation on American Warning and Ventilating, Inc. (AWV), Model 8700, Back Pressure Steam Isolation Dampers have been discovered by the Limerick Generating Station (LGM) Fiald Electrical Group. Inspection of a representative numbe.r of these dampers by Bechtel Construction personnel and AWV personnel has resulted in the conclusion that a generic problem exists with loose electrical connections and damaged wire insulation. The loose connections are due to improper crimping of connectors on the ends of wires during production at the AWV plant. The nicked insulation is due to inadequate space for the No.12 gage wire used, resulting in interferences which have deformed the insulation. 182 of these dampers are to be used in LGS. All but nine have been received at the job site, and sixty five have been installed. 3.0 Analysis of Safety Implications An open circuit caused by loose wires in the back pressure steam isolation damper pressure sensing and solenoid operating circuit would result in failure of the solenoid to pull the pin which causes the counterweighted damper to close in the event of a pipe break outside containment. Although the dampers are redundant, a generic wiring problem offers no assurance that the redundant damper does not have the same problem. Failure of the dampers to operate could result in impairment of the proper operation of safety related equipment in the event of an accident requiring safe shutdown. i SDR-10-3
a e* h. 4.0" Corrective iction Taken The Limerick site HVAC sub-contractor has been directed to stop further installation of back pressure steam isolation dampers furnished under Purchase Order 8031-M-ll3BC until the identified deficiencies are corrected. Representatives of AWV have visited the Limerick site and inspected a sampling of the dampers. AWV has agreed to correct the notdd deficiencies and has prepared a corrective action procedure that is currently being reviewed for approval by Bechtel. This procedure will provide for 100% inspection of the subject dampers, and 100% replacement of the damper wiring and crimped terminals. Smaller size wire (no.14 gage) will be used to altninate the mechanical interferences. A calibratable type tool will be used for crimping connectors. It is anticipated that all corrective actions will be complete by December 31, 1980. AWV has advised Bechtel that on May 6,1980 they advised the USNRC of these defects under the reporting provisions of 10CFR, Part 21. 5.0 Conclusions It is concluded that the corrective actions described above will correct and preclude recurrence of electrical deficiencies in AWV back pressure steam isolation dampers at Limerick Generating Station. 4 SDR-10-4 --}}