ML20052H928
| ML20052H928 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 05/17/1982 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| Shared Package | |
| ML20052H929 | List: |
| References | |
| TASK-08-04, TASK-8-4, TASK-RR LSO5-82-05-030, LSO5-82-5-30, NUDOCS 8205240201 | |
| Download: ML20052H928 (4) | |
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May 17,1982 Docket No. 50-213 LS05-82-05-030 ffr. W. G. Counsil Vice President Nuclear Engineering and Operations Connecticut Yankee Atomic Power Company Post Office Box 270 lbrtford, Connecticut 06101
Dear Mr. Counsil:
SUBJECT:
SEP TOPIC VIII-4 ELECTRICAL PENETRATIONS OF REACTOR CONTAINMENT - FINAL SAFETY EVALUATION REPORT (HADDAM NECK) is the staff's safety evaluation report for SEP Topic VIII-4.
The basis for Enclosure 1 is given in Enclosure 2. is our contractor's technical evaluation that has been revised by the additional information and coninents provided in your letter of March 22, 1982. is the staff's position with regard to the acceptability of the electrical penetrations for your facility. The staff has concluded that your facility meets current licensing criteria and that this is an acceptable basis for considering this topic complete.
Sincerely, 1
Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5
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Division of Licensing hk Y
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5 Mr. W. G. Counsil cc Day, Berry & Howard Counselors at Law One Constitution Plaza Hartford, Connecticut 06103 Superintendent Haddam Neck Plant RFD #1 Post Office Box 127E East Hampton, Connecticut 06424
. Mr. Richard R. Laudenat Manager, Generation Facilities Licensing Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 Board of Selectmen Town Hall Haddam, Connecticut 06103 State of Connecticut Office of Policy and Management ATTN:
Under Secretary Energy Division 80 Washington Street Hartford, Connecticut 06115
~U. S. Environmental Protection Agency Region I Office ATTN:
Regional Radiation Representative i
.JFK Federal Building Boston, Massachusetts 02203
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Resident Inspector l
Haddam Neck Nuclear Power Stat'on c/o'U. S..NRC East Haddam Post Office East Haddam, Connecticut 06423 l
Ronald C. Haynes, Regional Administrator l
Nuclear Regulatory Commission, Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 l
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ENCLOSURE 1 l
SYSTEMATIC EVALUATION PROGRAM l
TOPIC VIII-4 HADDAM NECK TOPIC VIII-4 ELECTRICAL PENETRATIONS OF REACTOR CONTAI!UiENT I.
INTRODUCTION The safety objective of Topic VIII-4, ' Electrical Penetrations of Reactor Cont'ainment," is to assure that all electrical penetrations in the contain-l ment structure are designed not to fail from electrical faults during a high energy line break.
As part of the Systematic Evaluation Program (SEP) the NRC staff performed an audit, comparing sample containment electrical penetrations in SEP facilities with current licensing criteria for protection against fault and overload currents following a postulated accident.
II.
REVIEW CRITERIA The review criteria are presented in Section 2.0 of EG&G Report EGG-EA-5847, " Electrical Penetrations of the Reactor Containment." In addition, in licensing new plants, the staff requires compliar.ce with the recomenda-tions of Regulatory Guide 1.63 or an acceptable alternative method.
For each containment electrical penetration, the protective systems should provide primary and backup circuit protection devices to prevent a single failure in conjunction with a circuit overload from impairing containment ~
integrity.
The primary and backup protection devices must have trip time i
vs. current response characteristics which assure protection'against l
penetration failure.
The protection devices are to be periodically tested to verify trip setpoints and adequacy of response.
l No single failure should allow excessive currents in the penetration conductors that will degrade the penetration seals.
Where external control power is used for actuating the protection systems the power for primary and backup breakers should be derived from separate sources.
,0vercurrent signals for tripping primary and backup system devices should be electrically independent and physically separated.
III.
RELATED SAFETY TOPICS AND ' INTERFACES The scope of r5 view for this topic was limited to avoid duplication of effort since some aspects of the review were performed under the related Topic III-12. " Environmental Qualification." The related topic report contains the acceptance criteria and review guidance for its. subject matter.
1
-2 Theoretically, there are no safety topics that are dependent on the present topic information for their completion, however, the results of the present topic have a definite impact upon the capability of equipment inside of containment to function after a high energy line brea k.
IV.
REVIEW GUIDELINES The review guidelines are presented in Section 3.0 of EG&G Report EGG-EA-5847, " Electrical Penetrations of the Reactor Containment."
V.
EVALUATION As noted in the EG8G Report on this topic with a LOCA environment inside containment, the protection for all penetrations conforms to the current licensing criteria.
VI.
CONCLUSIONS As a result of our review we have concluded that the present design of the electrical penetrations is acceptable.
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